From ce2c4a99144076e784c6017737e161108c2f414a Mon Sep 17 00:00:00 2001
From: Nicolas Boisselier <nicolas.boisselier@gmail.com>
Date: Tue, 22 Jan 2019 01:38:21 +0100
Subject: [PATCH] phpseclib

---
 bin/nb-read.php                        |   18 +-
 bin/nico-crypt-info                    |   89 -
 bin/nico-quittances                    |  234 --
 lib/php/nb.php                         |   45 +-
 lib/php/phpseclib/Crypt/AES.php        |  197 +
 lib/php/phpseclib/Crypt/Base.php       | 2660 ++++++++++++
 lib/php/phpseclib/Crypt/Blowfish.php   |  644 +++
 lib/php/phpseclib/Crypt/DES.php        | 1516 +++++++
 lib/php/phpseclib/Crypt/Hash.php       |  922 +++++
 lib/php/phpseclib/Crypt/RC2.php        |  761 ++++
 lib/php/phpseclib/Crypt/RC4.php        |  366 ++
 lib/php/phpseclib/Crypt/RSA.php        | 3142 +++++++++++++++
 lib/php/phpseclib/Crypt/Random.php     |  338 ++
 lib/php/phpseclib/Crypt/Rijndael.php   | 1050 +++++
 lib/php/phpseclib/Crypt/TripleDES.php  |  517 +++
 lib/php/phpseclib/Crypt/Twofish.php    |  889 ++++
 lib/php/phpseclib/File/ANSI.php        |  604 +++
 lib/php/phpseclib/File/ASN1.php        | 1485 +++++++
 lib/php/phpseclib/File/X509.php        | 5145 ++++++++++++++++++++++++
 lib/php/phpseclib/Math/BigInteger.php  | 3812 ++++++++++++++++++
 lib/php/phpseclib/Net/SCP.php          |  373 ++
 lib/php/phpseclib/Net/SFTP.php         | 3171 +++++++++++++++
 lib/php/phpseclib/Net/SFTP/Stream.php  |  815 ++++
 lib/php/phpseclib/Net/SSH1.php         | 1691 ++++++++
 lib/php/phpseclib/Net/SSH2.php         | 4886 ++++++++++++++++++++++
 lib/php/phpseclib/System/SSH/Agent.php |  561 +++
 lib/php/phpseclib/System/SSH_Agent.php |   39 +
 lib/php/phpseclib/bootstrap.php        |   16 +
 lib/php/phpseclib/openssl.cnf          |    6 +
 lib/php/phpseclib/test.php             |   64 +
 30 files changed, 35712 insertions(+), 344 deletions(-)
 delete mode 100755 bin/nico-crypt-info
 delete mode 100755 bin/nico-quittances
 create mode 100644 lib/php/phpseclib/Crypt/AES.php
 create mode 100644 lib/php/phpseclib/Crypt/Base.php
 create mode 100644 lib/php/phpseclib/Crypt/Blowfish.php
 create mode 100644 lib/php/phpseclib/Crypt/DES.php
 create mode 100644 lib/php/phpseclib/Crypt/Hash.php
 create mode 100644 lib/php/phpseclib/Crypt/RC2.php
 create mode 100644 lib/php/phpseclib/Crypt/RC4.php
 create mode 100644 lib/php/phpseclib/Crypt/RSA.php
 create mode 100644 lib/php/phpseclib/Crypt/Random.php
 create mode 100644 lib/php/phpseclib/Crypt/Rijndael.php
 create mode 100644 lib/php/phpseclib/Crypt/TripleDES.php
 create mode 100644 lib/php/phpseclib/Crypt/Twofish.php
 create mode 100644 lib/php/phpseclib/File/ANSI.php
 create mode 100644 lib/php/phpseclib/File/ASN1.php
 create mode 100644 lib/php/phpseclib/File/X509.php
 create mode 100644 lib/php/phpseclib/Math/BigInteger.php
 create mode 100644 lib/php/phpseclib/Net/SCP.php
 create mode 100644 lib/php/phpseclib/Net/SFTP.php
 create mode 100644 lib/php/phpseclib/Net/SFTP/Stream.php
 create mode 100644 lib/php/phpseclib/Net/SSH1.php
 create mode 100644 lib/php/phpseclib/Net/SSH2.php
 create mode 100644 lib/php/phpseclib/System/SSH/Agent.php
 create mode 100644 lib/php/phpseclib/System/SSH_Agent.php
 create mode 100644 lib/php/phpseclib/bootstrap.php
 create mode 100644 lib/php/phpseclib/openssl.cnf
 create mode 100644 lib/php/phpseclib/test.php

diff --git a/bin/nb-read.php b/bin/nb-read.php
index a588d4f8..1700f8a2 100755
--- a/bin/nb-read.php
+++ b/bin/nb-read.php
@@ -7,10 +7,24 @@
 * bin/nb-stdin
 */
 require_once(dirname(__FILE__).'/../lib/php/nb.php');
-
 define('USAGE','nb-read.php METHOD_TO_READ_LINES FUNCTION1, FUNCTION2, ... '."\n");
-
 define('NAME',$argv[0]); array_shift($argv);
+
+# NB 21.01.19: 
+/*
+$NB = new NB();
+while($line = fgets(STDIN)) {
+	$line = preg_replace('/\r?\n$/','',$line);
+
+	foreach ($argv as $fct) {
+		$line = $NB->$fct($line);
+	}
+
+	echo $line."\n";
+}
+exit;
+*/
+
 if (!$argv) die(USAGE);
 
 $METHOD = $argv[0]; array_shift($argv);
diff --git a/bin/nico-crypt-info b/bin/nico-crypt-info
deleted file mode 100755
index 6dbf62f5..00000000
--- a/bin/nico-crypt-info
+++ /dev/null
@@ -1,89 +0,0 @@
-#!/usr/bin/perl -w
-#################################################################################
-#
-# NB 22.07.12 - (C) 2012 Nicolas Boisselier
-# /home/bin/nico-crypt-info
-#
-#################################################################################
-use strict;
-my ($NAME) = $0 =~ m,([^/]+)$,;
-my $FILE = "/home/nico/Crypt/LOGIN.INI";
-
-print "Usage: $0 [FILE] REGEXP [values|line|ini]
-" and exit unless @ARGV or join(' ',@ARGV) =~ /-help|-h/;
-
-if (@ARGV and $ARGV[0] !~ /^\.+$/ and -e $ARGV[0]) {
-	$FILE = shift(@ARGV);
-} else {
-	#&as_user();
-}
-
-my $regexp = shift @ARGV;
-my $opt = shift(@ARGV) || 'values';
-
-open(FILE,$FILE) or die "$NAME: can't read $FILE: $! !";
-
-my $dom = "";
-my $dom_found;
-
-while (<FILE>) {
-	next if /^\s*(;|$)/;
-
-	if (/^\[\s*(.*?)\s*\]/) {
-		$dom = $1;
-		$dom_found = 0;
-		next;
-
-	} elsif ($dom) {
-		my $fdom = $dom;
-		$fdom =~ s/ +/./g;
-		$fdom =~ s/\s//g;
-		#$fdom = lc $fdom;
-		$_ = $fdom.'.'.$_;
-
-	}
-
-	next if $regexp and !/$regexp/i;
-
-	$dom_found ++;
-
-	if ($opt eq "values") {
-		s/^.*?=\s*(.*?)\s*$/$1\n/;
-
-	} elsif ($opt eq "ini") {
-		print "\n[ $dom ]\n" if $dom_found == 1;
-
-	}
-
-	print $_;
-
-}
-
-close FILE;
-
-exit;
-
-sub as_user {
-	my $user = getpwuid((stat($0))[4]);
-	my $cur = getpwuid($<);
-
-	#@_ = ('su',$user,'-c',$0,@ARGV);
-	#@_ = ('su',$user,'-c',join(' ',$0,@ARGV)); exec @_;
-
-	$_ = "echo su $user -c \"$0 ".join(" ",@ARGV)."\"";
-	#system($_);
-
-#die map{"$_\n"} @_;
-
-	if ($cur eq 'root') {
-    exec $_;
-		die "$NAME exec failed !";
-
-	} elsif ($cur ne $user) {
-		die "$NAME: you muste be logged as $user !";
-
-	}
-	#die "$user: $cur";
-
-}
-
diff --git a/bin/nico-quittances b/bin/nico-quittances
deleted file mode 100755
index f33392cc..00000000
--- a/bin/nico-quittances
+++ /dev/null
@@ -1,234 +0,0 @@
-#!/usr/bin/env perl
-use strict;
-use warnings;
-#################################################################################
-#
-# VERSION
-#
-#################################################################################
-my $VERSION = '0.0.1';
-# NB 22.07.14
-# - create script
-
-#################################################################################
-#
-# GLOBALS
-#
-#################################################################################
-my ($NAME) = $0 =~ m,([^/]+)$,;
-
-#################################################################################
-#
-# ARGS
-#
-#################################################################################
-my $VERBOSE = $main::VERBOSE = 0;
-my $DEBUG = $main::DEBUG = 0;
-my $DATE_FORMAT = '%d/%m/%Y';
-my $TEMPLATE = $ENV{HOME}.'/doc/Rent/Quittance.html';
-my $LODGER = 'Stephane Boutiot';
-my $ADDR1 = '174 Avenue Raymond Naves';
-my $ADDR2 = '31300 Toulouse';
-
-my %Opt; get_options(\%Opt);
-help() unless @ARGV;
-$main::_DATA_ = undef;
-
-#################################################################################
-#
-# BEGIN
-#
-#################################################################################
-use Data::Dumper;
-use Date::Manip qw(ParseDate UnixDate DateCalc);
- use File::Basename;
-
-open(TEMPLATE,$TEMPLATE) or die "$NAME: can't read $TEMPLATE";
-my $template = join('',<TEMPLATE>);
-close TEMPLATE;
-
-#chdir dirname($TEMPLATE);
-for my $date (@ARGV) {
-
-  my $date1 = ParseDate($date);
-  my $next_month = ParseDate(DateCalc($date,'+1 month'));
-  my $date2 = ParseDate(DateCalc($next_month,'-1 day'));
-
-  $date1 = UnixDate($date1,$DATE_FORMAT);
-  $date2 = UnixDate($date2,$DATE_FORMAT);
-  $next_month = UnixDate($next_month,$DATE_FORMAT);
-
-  $_ = $template;
-  s/\[DATE1\]/$date1/g;
-  s/\[DATE2\]/$date2/g;
-  s/\[NEXT_MONTH\]/$next_month/g;
-  s/\[ADDR1\]/$ADDR1/g;
-  s/\[ADDR2\]/$ADDR2/g;
-  s/\[LODGER\]/$LODGER/g;
-  print "$LODGER: $next_month from $date1 to $date2 -> Quittance-$date.pdf\n";
-  next if $DEBUG;
-  #open(PDF,"| htmldoc --encryption --quiet --webpage --no-title --header '...' --footer '...' -t pdf - > Quittance-$date.pdf") or die "$NAME: can't write into $date.pdf";
-  open(PDF,"| wkhtmltopdf ".($VERBOSE ? '' : '--quiet ')."- Quittance-$date.pdf") or die "$NAME: can't write into $date.pdf";
-  print PDF $_;
-  close PDF;
-
-}
-
-#################################################################################
-#
-# END
-#
-#################################################################################
-exit 0;
-
-#################################################################################
-#
-# Functions
-#
-#################################################################################
-
-sub help {
-#------------------------------------------------------------------------------
-# Print help and exit
-#------------------------------------------------------------------------------
-
-	require 'Pod/Usage.pm' unless $INC{'Pod/Usage.pm'};
-	require 'Pod/Perldoc.pm' unless $INC{'Pod/Perldoc.pm'};
-
-	# Substitutions
-	sub pod_env {
-		my $v = '';
-		eval '$v = ref(\\'.$_[0].') eq "ARRAY" ? join(" ",'.$_[0].') : '.$_[0].'; return defined $v ? $v : qq|UNDEF|;';
-		return $v;
-	}
-
-	$main::_DATA_ =~ s/([@\$][A-Z_]+)/pod_env($1)/eg;
-
-	# Create tmp
-  my $in_file = (-e '/dev/shm' ? '/dev/shm' : '/tmp')."/$NAME.$$";
-  my $in;
-  open($in,">$in_file") or die "$NAME: Can't write into $in_file: $!";
-  print $in $main::_DATA_;
-	close $in;
-
-	# Output
-	open(STDOUT,"|perl -pe 's/\.$$//g'".(($ENV{PAGER}||'') eq 'less' ? "|less -FRi" : ""));
-	my $opts = {
-		-input => $in_file,
-		-ouput => \*STDOUT,
-		-exitval => 'noexit',
-		-sections => [qw(SYNOPSIS DESCRIPTION OPTIONS)],
-		-verbose => ($Opt{'help'} ? 99 : 3),
-	};
-
-	Pod::Usage::pod2usage($opts);
-  close STDOUT;
-  unlink $in_file if $in_file and -e $in_file;
-
-	exit 0;
-}
-
-#------------------------------------------------------------------------------
-# Print version and exit
-#------------------------------------------------------------------------------
-sub version { print "$NAME: version [$VERSION]\n"; exit 0; }
-
-#------------------------------------------------------------------------------
-# Get options from pod
-#------------------------------------------------------------------------------
-sub get_options {
-
-	use Getopt::Long qw(:config no_ignore_case no_auto_abbrev);
-
-	my @Opt;
-
-	sub pod_opt {
-		local $_;
-		my $o = shift;
-		$o =~ s/(=.|[\+\-\!]$)//;
-		$o = join(", ",map{"-$_"} split(/[\|,:;]/,$o));
-		return "$o";
-	}
-
-	while (<DATA>) {
-		s/option\[([^\]]+)\]/push(@Opt,$1) and pod_opt($1)/eg;
-		$main::_DATA_ .= $_;
-	}
-
-	GetOptions($_[0],@Opt) || exit -1;
-
-	help() if $_[0]{'help'} or $_[0]{'man'};
-	version() if $_[0]{'version'};
-
-	$main::VERBOSE = $VERBOSE = $_[0]{'verbose'} if defined $_[0]{'verbose'};
-	$main::DEBUG = $DEBUG = $_[0]{'debug'} if defined $_[0]{'debug'};
-
-}
-
-__DATA__
-
-=head1 NAME
-
-$NAME - Generate quitance
-
-=head1 SYNOPSIS
-
-Quick usage: $NAME YYYY-MM YYYY-MM
-
-=over
-
-=item $NAME --verbose
-
-=item $NAME --help
-
-=back
-
-=head1 DESCRIPTION
-
-...
-
-=head1 OPTIONS
-
-=over 2
-
-=item B<option[verbose|v+]> Verbose mode: increase the verbosity level.
-
-=item B<option[debug+]>        Debug mode: increase the verbosity level.
-
-=item B<option[version|V]>  Print version (default: $VERSION)
-
-=item B<option[help|h|?]> Print a brief help message and exits.
-
-=item B<option[man]>          Prints the manual page and exits.
-
-=back
-
-=cut
-
-=head1 EXAMPLES
-
-...
-
-=head1 REQUIRES
-
-Getopt::Std, Pod::Usage
-
-=head1 COPYRIGHT AND LICENSE
-
-Copyright (C) 2014 Nicolas Boisselier
-
-This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
-
-This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
-
-See <http://www.gnu.org/licenses/>.
-
-=head1 SEE ALSO
-
-perl(1), http://perldoc.perl.org/perlpodstyle.html
-
-=head1 AUTHOR
-
-Nicolas Boisselier nicolas.boisselier@gmail.com
-
-=cut
diff --git a/lib/php/nb.php b/lib/php/nb.php
index b1903b65..eb3fd9ee 100644
--- a/lib/php/nb.php
+++ b/lib/php/nb.php
@@ -7,10 +7,12 @@ if (NB_PROD) unset ($_GET['debug']);
 
 # use _GET instead of _REQUEST
 if (!defined('NB_P_GET')) define('NB_P_GET',true);
+define('OLD_CRYPT',0);
 
 require_once(NB_ROOT.'/lib/php/functions.php');
 
 if (class_exists('NB')) return; # protect against double include
+
 class NB {
 	#public static function test() { static $i=0; echo ($i++)."\n"; }
 
@@ -970,22 +972,31 @@ class NB {
 		return str_pad($input,$pad_length-$mb_diff,$pad_string,$pad_type);
 	} 
 
+	private static function _encrypt_decrypt_object($key) {
+		static $cipher = null;
+		if ($cipher === null) {
+			require_once(NB_ROOT.'/lib/php/phpseclib/Crypt/AES.php');
+			require_once(NB_ROOT.'/lib/php/phpseclib/Crypt/Random.php');
+			$cipher = new Crypt_AES();
+		}
+		if (!empty($key)) $cipher->setIV($key);
+		return $cipher;
+		return self::_encrypt_decrypt_object($key)->decrypt($value);
+	}
+
 	public static function cryptkey($length=32) {
+		if (!OLD_CRYPT) {
+			self::_encrypt_decrypt_object();
+			return substr(bin2hex(crypt_random_string(($length/2)+1)),0,$length);
+		}
 		return bin2hex(mcrypt_create_iv($length/2, MCRYPT_DEV_URANDOM));
 	}
 
+	public static function _encrypt($key,$value) {
+		return base64_encode(self::_encrypt_decrypt_object($key)->encrypt($value));
+	}
 	public static function encrypt($key,$value) {
-	/*
-	# NB 17.01.19: TODO 
-// Remove the base64 encoding from our key
-$encryption_key = base64_decode($key);
-// Generate an initialization vector
-$iv = openssl_random_pseudo_bytes(openssl_cipher_iv_length('aes-256-cbc'));
-// Encrypt the data using AES 256 encryption in CBC mode using our encryption key and initialization vector.
-$encrypted = openssl_encrypt($value, 'aes-256-cbc', $key, 0, $iv);
-// The $iv is just as important as the key for decrypting, so save it with our encrypted data using a unique separator (::)
-return base64_encode($encrypted . '::' . $iv);
-	*/
+		if (!OLD_CRYPT) return self::_encrypt($key,$value);
 		static $iv = null;
 		if ($iv === null) {
 			$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_CBC);
@@ -994,15 +1005,11 @@ return base64_encode($encrypted . '::' . $iv);
 		return base64_encode($iv . mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $value, MCRYPT_MODE_CBC, $iv));
 	}
 
+	public static function _decrypt($key,$value) {
+		return self::_encrypt_decrypt_object($key)->decrypt(base64_decode($value));
+	}
 	public static function decrypt($key,$value) {
-	/*
-	# NB 17.01.19: TODO 
-// Remove the base64 encoding from our key
-$encryption_key = base64_decode($key);
-// To decrypt, split the encrypted data from our IV - our unique separator used was "::"
-list($encrypted_data, $iv) = explode('::', base64_decode($data), 2);
-return openssl_decrypt($encrypted_data, 'aes-256-cbc', $encryption_key, 0, $iv);
-	*/
+		if (!OLD_CRYPT) return self::_decrypt($key,$value);
 		static $iv_size = null;
 		if ($iv_size === null) {
 			$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_CBC);
diff --git a/lib/php/phpseclib/Crypt/AES.php b/lib/php/phpseclib/Crypt/AES.php
new file mode 100644
index 00000000..93457a27
--- /dev/null
+++ b/lib/php/phpseclib/Crypt/AES.php
@@ -0,0 +1,197 @@
+<?php
+
+/**
+ * Pure-PHP implementation of AES.
+ *
+ * Uses mcrypt, if available/possible, and an internal implementation, otherwise.
+ *
+ * PHP versions 4 and 5
+ *
+ * NOTE: Since AES.php is (for compatibility and phpseclib-historical reasons) virtually
+ * just a wrapper to Rijndael.php you may consider using Rijndael.php instead of
+ * to save one include_once().
+ *
+ * If {@link self::setKeyLength() setKeyLength()} isn't called, it'll be calculated from
+ * {@link self::setKey() setKey()}.  ie. if the key is 128-bits, the key length will be 128-bits.  If it's 136-bits
+ * it'll be null-padded to 192-bits and 192 bits will be the key length until {@link self::setKey() setKey()}
+ * is called, again, at which point, it'll be recalculated.
+ *
+ * Since Crypt_AES extends Crypt_Rijndael, some functions are available to be called that, in the context of AES, don't
+ * make a whole lot of sense.  {@link self::setBlockLength() setBlockLength()}, for instance.  Calling that function,
+ * however possible, won't do anything (AES has a fixed block length whereas Rijndael has a variable one).
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ *    include 'Crypt/AES.php';
+ *
+ *    $aes = new Crypt_AES();
+ *
+ *    $aes->setKey('abcdefghijklmnop');
+ *
+ *    $size = 10 * 1024;
+ *    $plaintext = '';
+ *    for ($i = 0; $i < $size; $i++) {
+ *        $plaintext.= 'a';
+ *    }
+ *
+ *    echo $aes->decrypt($aes->encrypt($plaintext));
+ * ?>
+ * </code>
+ *
+ * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @category  Crypt
+ * @package   Crypt_AES
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2008 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+/**
+ * Include Crypt_Rijndael
+ */
+if (!class_exists('Crypt_Rijndael')) {
+    include_once 'Rijndael.php';
+}
+
+/**#@+
+ * @access public
+ * @see self::encrypt()
+ * @see self::decrypt()
+ */
+/**
+ * Encrypt / decrypt using the Counter mode.
+ *
+ * Set to -1 since that's what Crypt/Random.php uses to index the CTR mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Counter_.28CTR.29
+ */
+define('CRYPT_AES_MODE_CTR', CRYPT_MODE_CTR);
+/**
+ * Encrypt / decrypt using the Electronic Code Book mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Electronic_codebook_.28ECB.29
+ */
+define('CRYPT_AES_MODE_ECB', CRYPT_MODE_ECB);
+/**
+ * Encrypt / decrypt using the Code Book Chaining mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher-block_chaining_.28CBC.29
+ */
+define('CRYPT_AES_MODE_CBC', CRYPT_MODE_CBC);
+/**
+ * Encrypt / decrypt using the Cipher Feedback mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher_feedback_.28CFB.29
+ */
+define('CRYPT_AES_MODE_CFB', CRYPT_MODE_CFB);
+/**
+ * Encrypt / decrypt using the Cipher Feedback mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Output_feedback_.28OFB.29
+ */
+define('CRYPT_AES_MODE_OFB', CRYPT_MODE_OFB);
+/**#@-*/
+
+/**
+ * Pure-PHP implementation of AES.
+ *
+ * @package Crypt_AES
+ * @author  Jim Wigginton <terrafrost@php.net>
+ * @access  public
+ */
+class Crypt_AES extends Crypt_Rijndael
+{
+    /**
+     * The namespace used by the cipher for its constants.
+     *
+     * @see Crypt_Base::const_namespace
+     * @var string
+     * @access private
+     */
+    var $const_namespace = 'AES';
+
+    /**
+     * Dummy function
+     *
+     * Since Crypt_AES extends Crypt_Rijndael, this function is, technically, available, but it doesn't do anything.
+     *
+     * @see Crypt_Rijndael::setBlockLength()
+     * @access public
+     * @param int $length
+     */
+    function setBlockLength($length)
+    {
+        return;
+    }
+
+    /**
+     * Sets the key length
+     *
+     * Valid key lengths are 128, 192, and 256.  If the length is less than 128, it will be rounded up to
+     * 128.  If the length is greater than 128 and invalid, it will be rounded down to the closest valid amount.
+     *
+     * @see Crypt_Rijndael:setKeyLength()
+     * @access public
+     * @param int $length
+     */
+    function setKeyLength($length)
+    {
+        switch ($length) {
+            case 160:
+                $length = 192;
+                break;
+            case 224:
+                $length = 256;
+        }
+        parent::setKeyLength($length);
+    }
+
+    /**
+     * Sets the key.
+     *
+     * Rijndael supports five different key lengths, AES only supports three.
+     *
+     * @see Crypt_Rijndael:setKey()
+     * @see setKeyLength()
+     * @access public
+     * @param string $key
+     */
+    function setKey($key)
+    {
+        parent::setKey($key);
+
+        if (!$this->explicit_key_length) {
+            $length = strlen($key);
+            switch (true) {
+                case $length <= 16:
+                    $this->key_length = 16;
+                    break;
+                case $length <= 24:
+                    $this->key_length = 24;
+                    break;
+                default:
+                    $this->key_length = 32;
+            }
+            $this->_setEngine();
+        }
+    }
+}
diff --git a/lib/php/phpseclib/Crypt/Base.php b/lib/php/phpseclib/Crypt/Base.php
new file mode 100644
index 00000000..696d7065
--- /dev/null
+++ b/lib/php/phpseclib/Crypt/Base.php
@@ -0,0 +1,2660 @@
+<?php
+
+/**
+ * Base Class for all Crypt_* cipher classes
+ *
+ * PHP versions 4 and 5
+ *
+ * Internally for phpseclib developers:
+ *  If you plan to add a new cipher class, please note following rules:
+ *
+ *  - The new Crypt_* cipher class should extend Crypt_Base
+ *
+ *  - Following methods are then required to be overridden/overloaded:
+ *
+ *    - _encryptBlock()
+ *
+ *    - _decryptBlock()
+ *
+ *    - _setupKey()
+ *
+ *  - All other methods are optional to be overridden/overloaded
+ *
+ *  - Look at the source code of the current ciphers how they extend Crypt_Base
+ *    and take one of them as a start up for the new cipher class.
+ *
+ *  - Please read all the other comments/notes/hints here also for each class var/method
+ *
+ * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @category  Crypt
+ * @package   Crypt_Base
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @author    Hans-Juergen Petrich <petrich@tronic-media.com>
+ * @copyright 2007 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+/**#@+
+ * @access public
+ * @see self::encrypt()
+ * @see self::decrypt()
+ */
+/**
+ * Encrypt / decrypt using the Counter mode.
+ *
+ * Set to -1 since that's what Crypt/Random.php uses to index the CTR mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Counter_.28CTR.29
+ */
+define('CRYPT_MODE_CTR', -1);
+/**
+ * Encrypt / decrypt using the Electronic Code Book mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Electronic_codebook_.28ECB.29
+ */
+define('CRYPT_MODE_ECB', 1);
+/**
+ * Encrypt / decrypt using the Code Book Chaining mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher-block_chaining_.28CBC.29
+ */
+define('CRYPT_MODE_CBC', 2);
+/**
+ * Encrypt / decrypt using the Cipher Feedback mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher_feedback_.28CFB.29
+ */
+define('CRYPT_MODE_CFB', 3);
+/**
+ * Encrypt / decrypt using the Output Feedback mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Output_feedback_.28OFB.29
+ */
+define('CRYPT_MODE_OFB', 4);
+/**
+ * Encrypt / decrypt using streaming mode.
+ */
+define('CRYPT_MODE_STREAM', 5);
+/**#@-*/
+
+/**#@+
+ * @access private
+ * @see self::Crypt_Base()
+ * @internal These constants are for internal use only
+ */
+/**
+ * Base value for the internal implementation $engine switch
+ */
+define('CRYPT_ENGINE_INTERNAL', 1);
+/**
+ * Base value for the mcrypt implementation $engine switch
+ */
+define('CRYPT_ENGINE_MCRYPT', 2);
+/**
+ * Base value for the OpenSSL implementation $engine switch
+ */
+define('CRYPT_ENGINE_OPENSSL', 3);
+/**#@-*/
+
+/**
+ * Base Class for all Crypt_* cipher classes
+ *
+ * @package Crypt_Base
+ * @author  Jim Wigginton <terrafrost@php.net>
+ * @author  Hans-Juergen Petrich <petrich@tronic-media.com>
+ * @access  public
+ */
+class Crypt_Base
+{
+    /**
+     * The Encryption Mode
+     *
+     * @see self::Crypt_Base()
+     * @var int
+     * @access private
+     */
+    var $mode;
+
+    /**
+     * The Block Length of the block cipher
+     *
+     * @var int
+     * @access private
+     */
+    var $block_size = 16;
+
+    /**
+     * The Key
+     *
+     * @see self::setKey()
+     * @var string
+     * @access private
+     */
+    var $key = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
+
+    /**
+     * The Initialization Vector
+     *
+     * @see self::setIV()
+     * @var string
+     * @access private
+     */
+    var $iv;
+
+    /**
+     * A "sliding" Initialization Vector
+     *
+     * @see self::enableContinuousBuffer()
+     * @see self::_clearBuffers()
+     * @var string
+     * @access private
+     */
+    var $encryptIV;
+
+    /**
+     * A "sliding" Initialization Vector
+     *
+     * @see self::enableContinuousBuffer()
+     * @see self::_clearBuffers()
+     * @var string
+     * @access private
+     */
+    var $decryptIV;
+
+    /**
+     * Continuous Buffer status
+     *
+     * @see self::enableContinuousBuffer()
+     * @var bool
+     * @access private
+     */
+    var $continuousBuffer = false;
+
+    /**
+     * Encryption buffer for CTR, OFB and CFB modes
+     *
+     * @see self::encrypt()
+     * @see self::_clearBuffers()
+     * @var array
+     * @access private
+     */
+    var $enbuffer;
+
+    /**
+     * Decryption buffer for CTR, OFB and CFB modes
+     *
+     * @see self::decrypt()
+     * @see self::_clearBuffers()
+     * @var array
+     * @access private
+     */
+    var $debuffer;
+
+    /**
+     * mcrypt resource for encryption
+     *
+     * The mcrypt resource can be recreated every time something needs to be created or it can be created just once.
+     * Since mcrypt operates in continuous mode, by default, it'll need to be recreated when in non-continuous mode.
+     *
+     * @see self::encrypt()
+     * @var resource
+     * @access private
+     */
+    var $enmcrypt;
+
+    /**
+     * mcrypt resource for decryption
+     *
+     * The mcrypt resource can be recreated every time something needs to be created or it can be created just once.
+     * Since mcrypt operates in continuous mode, by default, it'll need to be recreated when in non-continuous mode.
+     *
+     * @see self::decrypt()
+     * @var resource
+     * @access private
+     */
+    var $demcrypt;
+
+    /**
+     * Does the enmcrypt resource need to be (re)initialized?
+     *
+     * @see Crypt_Twofish::setKey()
+     * @see Crypt_Twofish::setIV()
+     * @var bool
+     * @access private
+     */
+    var $enchanged = true;
+
+    /**
+     * Does the demcrypt resource need to be (re)initialized?
+     *
+     * @see Crypt_Twofish::setKey()
+     * @see Crypt_Twofish::setIV()
+     * @var bool
+     * @access private
+     */
+    var $dechanged = true;
+
+    /**
+     * mcrypt resource for CFB mode
+     *
+     * mcrypt's CFB mode, in (and only in) buffered context,
+     * is broken, so phpseclib implements the CFB mode by it self,
+     * even when the mcrypt php extension is available.
+     *
+     * In order to do the CFB-mode work (fast) phpseclib
+     * use a separate ECB-mode mcrypt resource.
+     *
+     * @link http://phpseclib.sourceforge.net/cfb-demo.phps
+     * @see self::encrypt()
+     * @see self::decrypt()
+     * @see self::_setupMcrypt()
+     * @var resource
+     * @access private
+     */
+    var $ecb;
+
+    /**
+     * Optimizing value while CFB-encrypting
+     *
+     * Only relevant if $continuousBuffer enabled
+     * and $engine == CRYPT_ENGINE_MCRYPT
+     *
+     * It's faster to re-init $enmcrypt if
+     * $buffer bytes > $cfb_init_len than
+     * using the $ecb resource furthermore.
+     *
+     * This value depends of the chosen cipher
+     * and the time it would be needed for it's
+     * initialization [by mcrypt_generic_init()]
+     * which, typically, depends on the complexity
+     * on its internaly Key-expanding algorithm.
+     *
+     * @see self::encrypt()
+     * @var int
+     * @access private
+     */
+    var $cfb_init_len = 600;
+
+    /**
+     * Does internal cipher state need to be (re)initialized?
+     *
+     * @see self::setKey()
+     * @see self::setIV()
+     * @see self::disableContinuousBuffer()
+     * @var bool
+     * @access private
+     */
+    var $changed = true;
+
+    /**
+     * Padding status
+     *
+     * @see self::enablePadding()
+     * @var bool
+     * @access private
+     */
+    var $padding = true;
+
+    /**
+     * Is the mode one that is paddable?
+     *
+     * @see self::Crypt_Base()
+     * @var bool
+     * @access private
+     */
+    var $paddable = false;
+
+    /**
+     * Holds which crypt engine internaly should be use,
+     * which will be determined automatically on __construct()
+     *
+     * Currently available $engines are:
+     * - CRYPT_ENGINE_OPENSSL  (very fast, php-extension: openssl, extension_loaded('openssl') required)
+     * - CRYPT_ENGINE_MCRYPT   (fast, php-extension: mcrypt, extension_loaded('mcrypt') required)
+     * - CRYPT_ENGINE_INTERNAL (slower, pure php-engine, no php-extension required)
+     *
+     * @see self::_setEngine()
+     * @see self::encrypt()
+     * @see self::decrypt()
+     * @var int
+     * @access private
+     */
+    var $engine;
+
+    /**
+     * Holds the preferred crypt engine
+     *
+     * @see self::_setEngine()
+     * @see self::setPreferredEngine()
+     * @var int
+     * @access private
+     */
+    var $preferredEngine;
+
+    /**
+     * The mcrypt specific name of the cipher
+     *
+     * Only used if $engine == CRYPT_ENGINE_MCRYPT
+     *
+     * @link http://www.php.net/mcrypt_module_open
+     * @link http://www.php.net/mcrypt_list_algorithms
+     * @see self::_setupMcrypt()
+     * @var string
+     * @access private
+     */
+    var $cipher_name_mcrypt;
+
+    /**
+     * The openssl specific name of the cipher
+     *
+     * Only used if $engine == CRYPT_ENGINE_OPENSSL
+     *
+     * @link http://www.php.net/openssl-get-cipher-methods
+     * @var string
+     * @access private
+     */
+    var $cipher_name_openssl;
+
+    /**
+     * The openssl specific name of the cipher in ECB mode
+     *
+     * If OpenSSL does not support the mode we're trying to use (CTR)
+     * it can still be emulated with ECB mode.
+     *
+     * @link http://www.php.net/openssl-get-cipher-methods
+     * @var string
+     * @access private
+     */
+    var $cipher_name_openssl_ecb;
+
+    /**
+     * The default salt used by setPassword()
+     *
+     * @see self::setPassword()
+     * @var string
+     * @access private
+     */
+    var $password_default_salt = 'phpseclib/salt';
+
+    /**
+     * The namespace used by the cipher for its constants.
+     *
+     * ie: AES.php is using CRYPT_AES_MODE_* for its constants
+     *     so $const_namespace is AES
+     *
+     *     DES.php is using CRYPT_DES_MODE_* for its constants
+     *     so $const_namespace is DES... and so on
+     *
+     * All CRYPT_<$const_namespace>_MODE_* are aliases of
+     * the generic CRYPT_MODE_* constants, so both could be used
+     * for each cipher.
+     *
+     * Example:
+     * $aes = new Crypt_AES(CRYPT_AES_MODE_CFB); // $aes will operate in cfb mode
+     * $aes = new Crypt_AES(CRYPT_MODE_CFB);     // identical
+     *
+     * @see self::Crypt_Base()
+     * @var string
+     * @access private
+     */
+    var $const_namespace;
+
+    /**
+     * The name of the performance-optimized callback function
+     *
+     * Used by encrypt() / decrypt()
+     * only if $engine == CRYPT_ENGINE_INTERNAL
+     *
+     * @see self::encrypt()
+     * @see self::decrypt()
+     * @see self::_setupInlineCrypt()
+     * @see self::$use_inline_crypt
+     * @var Callback
+     * @access private
+     */
+    var $inline_crypt;
+
+    /**
+     * Holds whether performance-optimized $inline_crypt() can/should be used.
+     *
+     * @see self::encrypt()
+     * @see self::decrypt()
+     * @see self::inline_crypt
+     * @var mixed
+     * @access private
+     */
+    var $use_inline_crypt;
+
+    /**
+     * If OpenSSL can be used in ECB but not in CTR we can emulate CTR
+     *
+     * @see self::_openssl_ctr_process()
+     * @var bool
+     * @access private
+     */
+    var $openssl_emulate_ctr = false;
+
+    /**
+     * Determines what options are passed to openssl_encrypt/decrypt
+     *
+     * @see self::isValidEngine()
+     * @var mixed
+     * @access private
+     */
+    var $openssl_options;
+
+    /**
+     * Has the key length explicitly been set or should it be derived from the key, itself?
+     *
+     * @see self::setKeyLength()
+     * @var bool
+     * @access private
+     */
+    var $explicit_key_length = false;
+
+    /**
+     * Don't truncate / null pad key
+     *
+     * @see self::_clearBuffers()
+     * @var bool
+     * @access private
+     */
+    var $skip_key_adjustment = false;
+
+    /**
+     * Default Constructor.
+     *
+     * Determines whether or not the mcrypt extension should be used.
+     *
+     * $mode could be:
+     *
+     * - CRYPT_MODE_ECB
+     *
+     * - CRYPT_MODE_CBC
+     *
+     * - CRYPT_MODE_CTR
+     *
+     * - CRYPT_MODE_CFB
+     *
+     * - CRYPT_MODE_OFB
+     *
+     * (or the alias constants of the chosen cipher, for example for AES: CRYPT_AES_MODE_ECB or CRYPT_AES_MODE_CBC ...)
+     *
+     * If not explicitly set, CRYPT_MODE_CBC will be used.
+     *
+     * @param int $mode
+     * @access public
+     */
+    function __construct($mode = CRYPT_MODE_CBC)
+    {
+        // $mode dependent settings
+        switch ($mode) {
+            case CRYPT_MODE_ECB:
+                $this->paddable = true;
+                $this->mode = CRYPT_MODE_ECB;
+                break;
+            case CRYPT_MODE_CTR:
+            case CRYPT_MODE_CFB:
+            case CRYPT_MODE_OFB:
+            case CRYPT_MODE_STREAM:
+                $this->mode = $mode;
+                break;
+            case CRYPT_MODE_CBC:
+            default:
+                $this->paddable = true;
+                $this->mode = CRYPT_MODE_CBC;
+        }
+
+        $this->_setEngine();
+
+        // Determining whether inline crypting can be used by the cipher
+        if ($this->use_inline_crypt !== false) {
+            $this->use_inline_crypt = version_compare(PHP_VERSION, '5.3.0') >= 0 || function_exists('create_function');
+        }
+    }
+
+    /**
+     * PHP4 compatible Default Constructor.
+     *
+     * @see self::__construct()
+     * @param int $mode
+     * @access public
+     */
+    function Crypt_Base($mode = CRYPT_MODE_CBC)
+    {
+        $this->__construct($mode);
+    }
+
+    /**
+     * Sets the initialization vector. (optional)
+     *
+     * SetIV is not required when CRYPT_MODE_ECB (or ie for AES: CRYPT_AES_MODE_ECB) is being used.  If not explicitly set, it'll be assumed
+     * to be all zero's.
+     *
+     * @access public
+     * @param string $iv
+     * @internal Can be overwritten by a sub class, but does not have to be
+     */
+    function setIV($iv)
+    {
+        if ($this->mode == CRYPT_MODE_ECB) {
+            return;
+        }
+
+        $this->iv = $iv;
+        $this->changed = true;
+    }
+
+    /**
+     * Sets the key length.
+     *
+     * Keys with explicitly set lengths need to be treated accordingly
+     *
+     * @access public
+     * @param int $length
+     */
+    function setKeyLength($length)
+    {
+        $this->explicit_key_length = true;
+        $this->changed = true;
+        $this->_setEngine();
+    }
+
+    /**
+     * Returns the current key length in bits
+     *
+     * @access public
+     * @return int
+     */
+    function getKeyLength()
+    {
+        return $this->key_length << 3;
+    }
+
+    /**
+     * Returns the current block length in bits
+     *
+     * @access public
+     * @return int
+     */
+    function getBlockLength()
+    {
+        return $this->block_size << 3;
+    }
+
+    /**
+     * Sets the key.
+     *
+     * The min/max length(s) of the key depends on the cipher which is used.
+     * If the key not fits the length(s) of the cipher it will paded with null bytes
+     * up to the closest valid key length.  If the key is more than max length,
+     * we trim the excess bits.
+     *
+     * If the key is not explicitly set, it'll be assumed to be all null bytes.
+     *
+     * @access public
+     * @param string $key
+     * @internal Could, but not must, extend by the child Crypt_* class
+     */
+    function setKey($key)
+    {
+        if (!$this->explicit_key_length) {
+            $this->setKeyLength(strlen($key) << 3);
+            $this->explicit_key_length = false;
+        }
+
+        $this->key = $key;
+        $this->changed = true;
+        $this->_setEngine();
+    }
+
+    /**
+     * Sets the password.
+     *
+     * Depending on what $method is set to, setPassword()'s (optional) parameters are as follows:
+     *     {@link http://en.wikipedia.org/wiki/PBKDF2 pbkdf2} or pbkdf1:
+     *         $hash, $salt, $count, $dkLen
+     *
+     *         Where $hash (default = sha1) currently supports the following hashes: see: Crypt/Hash.php
+     *
+     * @see Crypt/Hash.php
+     * @param string $password
+     * @param string $method
+     * @return bool
+     * @access public
+     * @internal Could, but not must, extend by the child Crypt_* class
+     */
+    function setPassword($password, $method = 'pbkdf2')
+    {
+        $key = '';
+
+        switch ($method) {
+            default: // 'pbkdf2' or 'pbkdf1'
+                $func_args = func_get_args();
+
+                // Hash function
+                $hash = isset($func_args[2]) ? $func_args[2] : 'sha1';
+
+                // WPA and WPA2 use the SSID as the salt
+                $salt = isset($func_args[3]) ? $func_args[3] : $this->password_default_salt;
+
+                // RFC2898#section-4.2 uses 1,000 iterations by default
+                // WPA and WPA2 use 4,096.
+                $count = isset($func_args[4]) ? $func_args[4] : 1000;
+
+                // Keylength
+                if (isset($func_args[5]) && $func_args[5] > 0) {
+                    $dkLen = $func_args[5];
+                } else {
+                    $dkLen = $method == 'pbkdf1' ? 2 * $this->key_length : $this->key_length;
+                }
+
+                switch (true) {
+                    case $method == 'pbkdf1':
+                        if (!class_exists('Crypt_Hash')) {
+                            include_once 'Crypt/Hash.php';
+                        }
+                        $hashObj = new Crypt_Hash();
+                        $hashObj->setHash($hash);
+                        if ($dkLen > $hashObj->getLength()) {
+                            user_error('Derived key too long');
+                            return false;
+                        }
+                        $t = $password . $salt;
+                        for ($i = 0; $i < $count; ++$i) {
+                            $t = $hashObj->hash($t);
+                        }
+                        $key = substr($t, 0, $dkLen);
+
+                        $this->setKey(substr($key, 0, $dkLen >> 1));
+                        $this->setIV(substr($key, $dkLen >> 1));
+
+                        return true;
+                    // Determining if php[>=5.5.0]'s hash_pbkdf2() function avail- and useable
+                    case !function_exists('hash_pbkdf2'):
+                    case !function_exists('hash_algos'):
+                    case !in_array($hash, hash_algos()):
+                        if (!class_exists('Crypt_Hash')) {
+                            include_once 'Crypt/Hash.php';
+                        }
+                        $i = 1;
+                        $hmac = new Crypt_Hash();
+                        $hmac->setHash($hash);
+                        $hmac->setKey($password);
+                        while (strlen($key) < $dkLen) {
+                            $f = $u = $hmac->hash($salt . pack('N', $i++));
+                            for ($j = 2; $j <= $count; ++$j) {
+                                $u = $hmac->hash($u);
+                                $f^= $u;
+                            }
+                            $key.= $f;
+                        }
+                        $key = substr($key, 0, $dkLen);
+                        break;
+                    default:
+                        $key = hash_pbkdf2($hash, $password, $salt, $count, $dkLen, true);
+                }
+        }
+
+        $this->setKey($key);
+
+        return true;
+    }
+
+    /**
+     * Encrypts a message.
+     *
+     * $plaintext will be padded with additional bytes such that it's length is a multiple of the block size. Other cipher
+     * implementations may or may not pad in the same manner.  Other common approaches to padding and the reasons why it's
+     * necessary are discussed in the following
+     * URL:
+     *
+     * {@link http://www.di-mgt.com.au/cryptopad.html http://www.di-mgt.com.au/cryptopad.html}
+     *
+     * An alternative to padding is to, separately, send the length of the file.  This is what SSH, in fact, does.
+     * strlen($plaintext) will still need to be a multiple of the block size, however, arbitrary values can be added to make it that
+     * length.
+     *
+     * @see self::decrypt()
+     * @access public
+     * @param string $plaintext
+     * @return string $ciphertext
+     * @internal Could, but not must, extend by the child Crypt_* class
+     */
+    function encrypt($plaintext)
+    {
+        if ($this->paddable) {
+            $plaintext = $this->_pad($plaintext);
+        }
+
+        if ($this->engine === CRYPT_ENGINE_OPENSSL) {
+            if ($this->changed) {
+                $this->_clearBuffers();
+                $this->changed = false;
+            }
+            switch ($this->mode) {
+                case CRYPT_MODE_STREAM:
+                    return openssl_encrypt($plaintext, $this->cipher_name_openssl, $this->key, $this->openssl_options);
+                case CRYPT_MODE_ECB:
+                    $result = openssl_encrypt($plaintext, $this->cipher_name_openssl, $this->key, $this->openssl_options);
+                    return !defined('OPENSSL_RAW_DATA') ? substr($result, 0, -$this->block_size) : $result;
+                case CRYPT_MODE_CBC:
+                    $result = openssl_encrypt($plaintext, $this->cipher_name_openssl, $this->key, $this->openssl_options, $this->encryptIV);
+                    if (!defined('OPENSSL_RAW_DATA')) {
+                        $result = substr($result, 0, -$this->block_size);
+                    }
+                    if ($this->continuousBuffer) {
+                        $this->encryptIV = substr($result, -$this->block_size);
+                    }
+                    return $result;
+                case CRYPT_MODE_CTR:
+                    return $this->_openssl_ctr_process($plaintext, $this->encryptIV, $this->enbuffer);
+                case CRYPT_MODE_CFB:
+                    // cfb loosely routines inspired by openssl's:
+                    // {@link http://cvs.openssl.org/fileview?f=openssl/crypto/modes/cfb128.c&v=1.3.2.2.2.1}
+                    $ciphertext = '';
+                    if ($this->continuousBuffer) {
+                        $iv = &$this->encryptIV;
+                        $pos = &$this->enbuffer['pos'];
+                    } else {
+                        $iv = $this->encryptIV;
+                        $pos = 0;
+                    }
+                    $len = strlen($plaintext);
+                    $i = 0;
+                    if ($pos) {
+                        $orig_pos = $pos;
+                        $max = $this->block_size - $pos;
+                        if ($len >= $max) {
+                            $i = $max;
+                            $len-= $max;
+                            $pos = 0;
+                        } else {
+                            $i = $len;
+                            $pos+= $len;
+                            $len = 0;
+                        }
+                        // ie. $i = min($max, $len), $len-= $i, $pos+= $i, $pos%= $blocksize
+                        $ciphertext = substr($iv, $orig_pos) ^ $plaintext;
+                        $iv = substr_replace($iv, $ciphertext, $orig_pos, $i);
+                        $plaintext = substr($plaintext, $i);
+                    }
+
+                    $overflow = $len % $this->block_size;
+
+                    if ($overflow) {
+                        $ciphertext.= openssl_encrypt(substr($plaintext, 0, -$overflow) . str_repeat("\0", $this->block_size), $this->cipher_name_openssl, $this->key, $this->openssl_options, $iv);
+                        $iv = $this->_string_pop($ciphertext, $this->block_size);
+
+                        $size = $len - $overflow;
+                        $block = $iv ^ substr($plaintext, -$overflow);
+                        $iv = substr_replace($iv, $block, 0, $overflow);
+                        $ciphertext.= $block;
+                        $pos = $overflow;
+                    } elseif ($len) {
+                        $ciphertext = openssl_encrypt($plaintext, $this->cipher_name_openssl, $this->key, $this->openssl_options, $iv);
+                        $iv = substr($ciphertext, -$this->block_size);
+                    }
+
+                    return $ciphertext;
+                case CRYPT_MODE_OFB:
+                    return $this->_openssl_ofb_process($plaintext, $this->encryptIV, $this->enbuffer);
+            }
+        }
+
+        if ($this->engine === CRYPT_ENGINE_MCRYPT) {
+            if ($this->changed) {
+                $this->_setupMcrypt();
+                $this->changed = false;
+            }
+            if ($this->enchanged) {
+                @mcrypt_generic_init($this->enmcrypt, $this->key, $this->encryptIV);
+                $this->enchanged = false;
+            }
+
+            // re: {@link http://phpseclib.sourceforge.net/cfb-demo.phps}
+            // using mcrypt's default handing of CFB the above would output two different things.  using phpseclib's
+            // rewritten CFB implementation the above outputs the same thing twice.
+            if ($this->mode == CRYPT_MODE_CFB && $this->continuousBuffer) {
+                $block_size = $this->block_size;
+                $iv = &$this->encryptIV;
+                $pos = &$this->enbuffer['pos'];
+                $len = strlen($plaintext);
+                $ciphertext = '';
+                $i = 0;
+                if ($pos) {
+                    $orig_pos = $pos;
+                    $max = $block_size - $pos;
+                    if ($len >= $max) {
+                        $i = $max;
+                        $len-= $max;
+                        $pos = 0;
+                    } else {
+                        $i = $len;
+                        $pos+= $len;
+                        $len = 0;
+                    }
+                    $ciphertext = substr($iv, $orig_pos) ^ $plaintext;
+                    $iv = substr_replace($iv, $ciphertext, $orig_pos, $i);
+                    $this->enbuffer['enmcrypt_init'] = true;
+                }
+                if ($len >= $block_size) {
+                    if ($this->enbuffer['enmcrypt_init'] === false || $len > $this->cfb_init_len) {
+                        if ($this->enbuffer['enmcrypt_init'] === true) {
+                            @mcrypt_generic_init($this->enmcrypt, $this->key, $iv);
+                            $this->enbuffer['enmcrypt_init'] = false;
+                        }
+                        $ciphertext.= @mcrypt_generic($this->enmcrypt, substr($plaintext, $i, $len - $len % $block_size));
+                        $iv = substr($ciphertext, -$block_size);
+                        $len%= $block_size;
+                    } else {
+                        while ($len >= $block_size) {
+                            $iv = @mcrypt_generic($this->ecb, $iv) ^ substr($plaintext, $i, $block_size);
+                            $ciphertext.= $iv;
+                            $len-= $block_size;
+                            $i+= $block_size;
+                        }
+                    }
+                }
+
+                if ($len) {
+                    $iv = @mcrypt_generic($this->ecb, $iv);
+                    $block = $iv ^ substr($plaintext, -$len);
+                    $iv = substr_replace($iv, $block, 0, $len);
+                    $ciphertext.= $block;
+                    $pos = $len;
+                }
+
+                return $ciphertext;
+            }
+
+            $ciphertext = @mcrypt_generic($this->enmcrypt, $plaintext);
+
+            if (!$this->continuousBuffer) {
+                @mcrypt_generic_init($this->enmcrypt, $this->key, $this->encryptIV);
+            }
+
+            return $ciphertext;
+        }
+
+        if ($this->changed) {
+            $this->_setup();
+            $this->changed = false;
+        }
+        if ($this->use_inline_crypt) {
+            $inline = $this->inline_crypt;
+            return $inline('encrypt', $this, $plaintext);
+        }
+
+        $buffer = &$this->enbuffer;
+        $block_size = $this->block_size;
+        $ciphertext = '';
+        switch ($this->mode) {
+            case CRYPT_MODE_ECB:
+                for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
+                    $ciphertext.= $this->_encryptBlock(substr($plaintext, $i, $block_size));
+                }
+                break;
+            case CRYPT_MODE_CBC:
+                $xor = $this->encryptIV;
+                for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
+                    $block = substr($plaintext, $i, $block_size);
+                    $block = $this->_encryptBlock($block ^ $xor);
+                    $xor = $block;
+                    $ciphertext.= $block;
+                }
+                if ($this->continuousBuffer) {
+                    $this->encryptIV = $xor;
+                }
+                break;
+            case CRYPT_MODE_CTR:
+                $xor = $this->encryptIV;
+                if (strlen($buffer['ciphertext'])) {
+                    for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
+                        $block = substr($plaintext, $i, $block_size);
+                        if (strlen($block) > strlen($buffer['ciphertext'])) {
+                            $buffer['ciphertext'].= $this->_encryptBlock($xor);
+                        }
+                        $this->_increment_str($xor);
+                        $key = $this->_string_shift($buffer['ciphertext'], $block_size);
+                        $ciphertext.= $block ^ $key;
+                    }
+                } else {
+                    for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
+                        $block = substr($plaintext, $i, $block_size);
+                        $key = $this->_encryptBlock($xor);
+                        $this->_increment_str($xor);
+                        $ciphertext.= $block ^ $key;
+                    }
+                }
+                if ($this->continuousBuffer) {
+                    $this->encryptIV = $xor;
+                    if ($start = strlen($plaintext) % $block_size) {
+                        $buffer['ciphertext'] = substr($key, $start) . $buffer['ciphertext'];
+                    }
+                }
+                break;
+            case CRYPT_MODE_CFB:
+                // cfb loosely routines inspired by openssl's:
+                // {@link http://cvs.openssl.org/fileview?f=openssl/crypto/modes/cfb128.c&v=1.3.2.2.2.1}
+                if ($this->continuousBuffer) {
+                    $iv = &$this->encryptIV;
+                    $pos = &$buffer['pos'];
+                } else {
+                    $iv = $this->encryptIV;
+                    $pos = 0;
+                }
+                $len = strlen($plaintext);
+                $i = 0;
+                if ($pos) {
+                    $orig_pos = $pos;
+                    $max = $block_size - $pos;
+                    if ($len >= $max) {
+                        $i = $max;
+                        $len-= $max;
+                        $pos = 0;
+                    } else {
+                        $i = $len;
+                        $pos+= $len;
+                        $len = 0;
+                    }
+                    // ie. $i = min($max, $len), $len-= $i, $pos+= $i, $pos%= $blocksize
+                    $ciphertext = substr($iv, $orig_pos) ^ $plaintext;
+                    $iv = substr_replace($iv, $ciphertext, $orig_pos, $i);
+                }
+                while ($len >= $block_size) {
+                    $iv = $this->_encryptBlock($iv) ^ substr($plaintext, $i, $block_size);
+                    $ciphertext.= $iv;
+                    $len-= $block_size;
+                    $i+= $block_size;
+                }
+                if ($len) {
+                    $iv = $this->_encryptBlock($iv);
+                    $block = $iv ^ substr($plaintext, $i);
+                    $iv = substr_replace($iv, $block, 0, $len);
+                    $ciphertext.= $block;
+                    $pos = $len;
+                }
+                break;
+            case CRYPT_MODE_OFB:
+                $xor = $this->encryptIV;
+                if (strlen($buffer['xor'])) {
+                    for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
+                        $block = substr($plaintext, $i, $block_size);
+                        if (strlen($block) > strlen($buffer['xor'])) {
+                            $xor = $this->_encryptBlock($xor);
+                            $buffer['xor'].= $xor;
+                        }
+                        $key = $this->_string_shift($buffer['xor'], $block_size);
+                        $ciphertext.= $block ^ $key;
+                    }
+                } else {
+                    for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
+                        $xor = $this->_encryptBlock($xor);
+                        $ciphertext.= substr($plaintext, $i, $block_size) ^ $xor;
+                    }
+                    $key = $xor;
+                }
+                if ($this->continuousBuffer) {
+                    $this->encryptIV = $xor;
+                    if ($start = strlen($plaintext) % $block_size) {
+                        $buffer['xor'] = substr($key, $start) . $buffer['xor'];
+                    }
+                }
+                break;
+            case CRYPT_MODE_STREAM:
+                $ciphertext = $this->_encryptBlock($plaintext);
+                break;
+        }
+
+        return $ciphertext;
+    }
+
+    /**
+     * Decrypts a message.
+     *
+     * If strlen($ciphertext) is not a multiple of the block size, null bytes will be added to the end of the string until
+     * it is.
+     *
+     * @see self::encrypt()
+     * @access public
+     * @param string $ciphertext
+     * @return string $plaintext
+     * @internal Could, but not must, extend by the child Crypt_* class
+     */
+    function decrypt($ciphertext)
+    {
+        if ($this->paddable) {
+            // we pad with chr(0) since that's what mcrypt_generic does.  to quote from {@link http://www.php.net/function.mcrypt-generic}:
+            // "The data is padded with "\0" to make sure the length of the data is n * blocksize."
+            $ciphertext = str_pad($ciphertext, strlen($ciphertext) + ($this->block_size - strlen($ciphertext) % $this->block_size) % $this->block_size, chr(0));
+        }
+
+        if ($this->engine === CRYPT_ENGINE_OPENSSL) {
+            if ($this->changed) {
+                $this->_clearBuffers();
+                $this->changed = false;
+            }
+            switch ($this->mode) {
+                case CRYPT_MODE_STREAM:
+                    $plaintext = openssl_decrypt($ciphertext, $this->cipher_name_openssl, $this->key, $this->openssl_options);
+                    break;
+                case CRYPT_MODE_ECB:
+                    if (!defined('OPENSSL_RAW_DATA')) {
+                        $ciphertext.= openssl_encrypt('', $this->cipher_name_openssl_ecb, $this->key, true);
+                    }
+                    $plaintext = openssl_decrypt($ciphertext, $this->cipher_name_openssl, $this->key, $this->openssl_options);
+                    break;
+                case CRYPT_MODE_CBC:
+                    if (!defined('OPENSSL_RAW_DATA')) {
+                        $padding = str_repeat(chr($this->block_size), $this->block_size) ^ substr($ciphertext, -$this->block_size);
+                        $ciphertext.= substr(openssl_encrypt($padding, $this->cipher_name_openssl_ecb, $this->key, true), 0, $this->block_size);
+                        $offset = 2 * $this->block_size;
+                    } else {
+                        $offset = $this->block_size;
+                    }
+                    $plaintext = openssl_decrypt($ciphertext, $this->cipher_name_openssl, $this->key, $this->openssl_options, $this->decryptIV);
+                    if ($this->continuousBuffer) {
+                        $this->decryptIV = substr($ciphertext, -$offset, $this->block_size);
+                    }
+                    break;
+                case CRYPT_MODE_CTR:
+                    $plaintext = $this->_openssl_ctr_process($ciphertext, $this->decryptIV, $this->debuffer);
+                    break;
+                case CRYPT_MODE_CFB:
+                    // cfb loosely routines inspired by openssl's:
+                    // {@link http://cvs.openssl.org/fileview?f=openssl/crypto/modes/cfb128.c&v=1.3.2.2.2.1}
+                    $plaintext = '';
+                    if ($this->continuousBuffer) {
+                        $iv = &$this->decryptIV;
+                        $pos = &$this->buffer['pos'];
+                    } else {
+                        $iv = $this->decryptIV;
+                        $pos = 0;
+                    }
+                    $len = strlen($ciphertext);
+                    $i = 0;
+                    if ($pos) {
+                        $orig_pos = $pos;
+                        $max = $this->block_size - $pos;
+                        if ($len >= $max) {
+                            $i = $max;
+                            $len-= $max;
+                            $pos = 0;
+                        } else {
+                            $i = $len;
+                            $pos+= $len;
+                            $len = 0;
+                        }
+                        // ie. $i = min($max, $len), $len-= $i, $pos+= $i, $pos%= $this->blocksize
+                        $plaintext = substr($iv, $orig_pos) ^ $ciphertext;
+                        $iv = substr_replace($iv, substr($ciphertext, 0, $i), $orig_pos, $i);
+                        $ciphertext = substr($ciphertext, $i);
+                    }
+                    $overflow = $len % $this->block_size;
+                    if ($overflow) {
+                        $plaintext.= openssl_decrypt(substr($ciphertext, 0, -$overflow), $this->cipher_name_openssl, $this->key, $this->openssl_options, $iv);
+                        if ($len - $overflow) {
+                            $iv = substr($ciphertext, -$overflow - $this->block_size, -$overflow);
+                        }
+                        $iv = openssl_encrypt(str_repeat("\0", $this->block_size), $this->cipher_name_openssl, $this->key, $this->openssl_options, $iv);
+                        $plaintext.= $iv ^ substr($ciphertext, -$overflow);
+                        $iv = substr_replace($iv, substr($ciphertext, -$overflow), 0, $overflow);
+                        $pos = $overflow;
+                    } elseif ($len) {
+                        $plaintext.= openssl_decrypt($ciphertext, $this->cipher_name_openssl, $this->key, $this->openssl_options, $iv);
+                        $iv = substr($ciphertext, -$this->block_size);
+                    }
+                    break;
+                case CRYPT_MODE_OFB:
+                    $plaintext = $this->_openssl_ofb_process($ciphertext, $this->decryptIV, $this->debuffer);
+            }
+
+            return $this->paddable ? $this->_unpad($plaintext) : $plaintext;
+        }
+
+        if ($this->engine === CRYPT_ENGINE_MCRYPT) {
+            $block_size = $this->block_size;
+            if ($this->changed) {
+                $this->_setupMcrypt();
+                $this->changed = false;
+            }
+            if ($this->dechanged) {
+                @mcrypt_generic_init($this->demcrypt, $this->key, $this->decryptIV);
+                $this->dechanged = false;
+            }
+
+            if ($this->mode == CRYPT_MODE_CFB && $this->continuousBuffer) {
+                $iv = &$this->decryptIV;
+                $pos = &$this->debuffer['pos'];
+                $len = strlen($ciphertext);
+                $plaintext = '';
+                $i = 0;
+                if ($pos) {
+                    $orig_pos = $pos;
+                    $max = $block_size - $pos;
+                    if ($len >= $max) {
+                        $i = $max;
+                        $len-= $max;
+                        $pos = 0;
+                    } else {
+                        $i = $len;
+                        $pos+= $len;
+                        $len = 0;
+                    }
+                    // ie. $i = min($max, $len), $len-= $i, $pos+= $i, $pos%= $blocksize
+                    $plaintext = substr($iv, $orig_pos) ^ $ciphertext;
+                    $iv = substr_replace($iv, substr($ciphertext, 0, $i), $orig_pos, $i);
+                }
+                if ($len >= $block_size) {
+                    $cb = substr($ciphertext, $i, $len - $len % $block_size);
+                    $plaintext.= @mcrypt_generic($this->ecb, $iv . $cb) ^ $cb;
+                    $iv = substr($cb, -$block_size);
+                    $len%= $block_size;
+                }
+                if ($len) {
+                    $iv = @mcrypt_generic($this->ecb, $iv);
+                    $plaintext.= $iv ^ substr($ciphertext, -$len);
+                    $iv = substr_replace($iv, substr($ciphertext, -$len), 0, $len);
+                    $pos = $len;
+                }
+
+                return $plaintext;
+            }
+
+            $plaintext = @mdecrypt_generic($this->demcrypt, $ciphertext);
+
+            if (!$this->continuousBuffer) {
+                @mcrypt_generic_init($this->demcrypt, $this->key, $this->decryptIV);
+            }
+
+            return $this->paddable ? $this->_unpad($plaintext) : $plaintext;
+        }
+
+        if ($this->changed) {
+            $this->_setup();
+            $this->changed = false;
+        }
+        if ($this->use_inline_crypt) {
+            $inline = $this->inline_crypt;
+            return $inline('decrypt', $this, $ciphertext);
+        }
+
+        $block_size = $this->block_size;
+
+        $buffer = &$this->debuffer;
+        $plaintext = '';
+        switch ($this->mode) {
+            case CRYPT_MODE_ECB:
+                for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
+                    $plaintext.= $this->_decryptBlock(substr($ciphertext, $i, $block_size));
+                }
+                break;
+            case CRYPT_MODE_CBC:
+                $xor = $this->decryptIV;
+                for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
+                    $block = substr($ciphertext, $i, $block_size);
+                    $plaintext.= $this->_decryptBlock($block) ^ $xor;
+                    $xor = $block;
+                }
+                if ($this->continuousBuffer) {
+                    $this->decryptIV = $xor;
+                }
+                break;
+            case CRYPT_MODE_CTR:
+                $xor = $this->decryptIV;
+                if (strlen($buffer['ciphertext'])) {
+                    for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
+                        $block = substr($ciphertext, $i, $block_size);
+                        if (strlen($block) > strlen($buffer['ciphertext'])) {
+                            $buffer['ciphertext'].= $this->_encryptBlock($xor);
+                            $this->_increment_str($xor);
+                        }
+                        $key = $this->_string_shift($buffer['ciphertext'], $block_size);
+                        $plaintext.= $block ^ $key;
+                    }
+                } else {
+                    for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
+                        $block = substr($ciphertext, $i, $block_size);
+                        $key = $this->_encryptBlock($xor);
+                        $this->_increment_str($xor);
+                        $plaintext.= $block ^ $key;
+                    }
+                }
+                if ($this->continuousBuffer) {
+                    $this->decryptIV = $xor;
+                    if ($start = strlen($ciphertext) % $block_size) {
+                        $buffer['ciphertext'] = substr($key, $start) . $buffer['ciphertext'];
+                    }
+                }
+                break;
+            case CRYPT_MODE_CFB:
+                if ($this->continuousBuffer) {
+                    $iv = &$this->decryptIV;
+                    $pos = &$buffer['pos'];
+                } else {
+                    $iv = $this->decryptIV;
+                    $pos = 0;
+                }
+                $len = strlen($ciphertext);
+                $i = 0;
+                if ($pos) {
+                    $orig_pos = $pos;
+                    $max = $block_size - $pos;
+                    if ($len >= $max) {
+                        $i = $max;
+                        $len-= $max;
+                        $pos = 0;
+                    } else {
+                        $i = $len;
+                        $pos+= $len;
+                        $len = 0;
+                    }
+                    // ie. $i = min($max, $len), $len-= $i, $pos+= $i, $pos%= $blocksize
+                    $plaintext = substr($iv, $orig_pos) ^ $ciphertext;
+                    $iv = substr_replace($iv, substr($ciphertext, 0, $i), $orig_pos, $i);
+                }
+                while ($len >= $block_size) {
+                    $iv = $this->_encryptBlock($iv);
+                    $cb = substr($ciphertext, $i, $block_size);
+                    $plaintext.= $iv ^ $cb;
+                    $iv = $cb;
+                    $len-= $block_size;
+                    $i+= $block_size;
+                }
+                if ($len) {
+                    $iv = $this->_encryptBlock($iv);
+                    $plaintext.= $iv ^ substr($ciphertext, $i);
+                    $iv = substr_replace($iv, substr($ciphertext, $i), 0, $len);
+                    $pos = $len;
+                }
+                break;
+            case CRYPT_MODE_OFB:
+                $xor = $this->decryptIV;
+                if (strlen($buffer['xor'])) {
+                    for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
+                        $block = substr($ciphertext, $i, $block_size);
+                        if (strlen($block) > strlen($buffer['xor'])) {
+                            $xor = $this->_encryptBlock($xor);
+                            $buffer['xor'].= $xor;
+                        }
+                        $key = $this->_string_shift($buffer['xor'], $block_size);
+                        $plaintext.= $block ^ $key;
+                    }
+                } else {
+                    for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
+                        $xor = $this->_encryptBlock($xor);
+                        $plaintext.= substr($ciphertext, $i, $block_size) ^ $xor;
+                    }
+                    $key = $xor;
+                }
+                if ($this->continuousBuffer) {
+                    $this->decryptIV = $xor;
+                    if ($start = strlen($ciphertext) % $block_size) {
+                        $buffer['xor'] = substr($key, $start) . $buffer['xor'];
+                    }
+                }
+                break;
+            case CRYPT_MODE_STREAM:
+                $plaintext = $this->_decryptBlock($ciphertext);
+                break;
+        }
+        return $this->paddable ? $this->_unpad($plaintext) : $plaintext;
+    }
+
+    /**
+     * OpenSSL CTR Processor
+     *
+     * PHP's OpenSSL bindings do not operate in continuous mode so we'll wrap around it. Since the keystream
+     * for CTR is the same for both encrypting and decrypting this function is re-used by both Crypt_Base::encrypt()
+     * and Crypt_Base::decrypt(). Also, OpenSSL doesn't implement CTR for all of it's symmetric ciphers so this
+     * function will emulate CTR with ECB when necessary.
+     *
+     * @see self::encrypt()
+     * @see self::decrypt()
+     * @param string $plaintext
+     * @param string $encryptIV
+     * @param array $buffer
+     * @return string
+     * @access private
+     */
+    function _openssl_ctr_process($plaintext, &$encryptIV, &$buffer)
+    {
+        $ciphertext = '';
+
+        $block_size = $this->block_size;
+        $key = $this->key;
+
+        if ($this->openssl_emulate_ctr) {
+            $xor = $encryptIV;
+            if (strlen($buffer['ciphertext'])) {
+                for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
+                    $block = substr($plaintext, $i, $block_size);
+                    if (strlen($block) > strlen($buffer['ciphertext'])) {
+                        $result = openssl_encrypt($xor, $this->cipher_name_openssl_ecb, $key, $this->openssl_options);
+                        $result = !defined('OPENSSL_RAW_DATA') ? substr($result, 0, -$this->block_size) : $result;
+                        $buffer['ciphertext'].= $result;
+                    }
+                    $this->_increment_str($xor);
+                    $otp = $this->_string_shift($buffer['ciphertext'], $block_size);
+                    $ciphertext.= $block ^ $otp;
+                }
+            } else {
+                for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
+                    $block = substr($plaintext, $i, $block_size);
+                    $otp = openssl_encrypt($xor, $this->cipher_name_openssl_ecb, $key, $this->openssl_options);
+                    $otp = !defined('OPENSSL_RAW_DATA') ? substr($otp, 0, -$this->block_size) : $otp;
+                    $this->_increment_str($xor);
+                    $ciphertext.= $block ^ $otp;
+                }
+            }
+            if ($this->continuousBuffer) {
+                $encryptIV = $xor;
+                if ($start = strlen($plaintext) % $block_size) {
+                    $buffer['ciphertext'] = substr($key, $start) . $buffer['ciphertext'];
+                }
+            }
+
+            return $ciphertext;
+        }
+
+        if (strlen($buffer['ciphertext'])) {
+            $ciphertext = $plaintext ^ $this->_string_shift($buffer['ciphertext'], strlen($plaintext));
+            $plaintext = substr($plaintext, strlen($ciphertext));
+
+            if (!strlen($plaintext)) {
+                return $ciphertext;
+            }
+        }
+
+        $overflow = strlen($plaintext) % $block_size;
+        if ($overflow) {
+            $plaintext2 = $this->_string_pop($plaintext, $overflow); // ie. trim $plaintext to a multiple of $block_size and put rest of $plaintext in $plaintext2
+            $encrypted = openssl_encrypt($plaintext . str_repeat("\0", $block_size), $this->cipher_name_openssl, $key, $this->openssl_options, $encryptIV);
+            $temp = $this->_string_pop($encrypted, $block_size);
+            $ciphertext.= $encrypted . ($plaintext2 ^ $temp);
+            if ($this->continuousBuffer) {
+                $buffer['ciphertext'] = substr($temp, $overflow);
+                $encryptIV = $temp;
+            }
+        } elseif (!strlen($buffer['ciphertext'])) {
+            $ciphertext.= openssl_encrypt($plaintext . str_repeat("\0", $block_size), $this->cipher_name_openssl, $key, $this->openssl_options, $encryptIV);
+            $temp = $this->_string_pop($ciphertext, $block_size);
+            if ($this->continuousBuffer) {
+                $encryptIV = $temp;
+            }
+        }
+        if ($this->continuousBuffer) {
+            if (!defined('OPENSSL_RAW_DATA')) {
+                $encryptIV.= openssl_encrypt('', $this->cipher_name_openssl_ecb, $key, $this->openssl_options);
+            }
+            $encryptIV = openssl_decrypt($encryptIV, $this->cipher_name_openssl_ecb, $key, $this->openssl_options);
+            if ($overflow) {
+                $this->_increment_str($encryptIV);
+            }
+        }
+
+        return $ciphertext;
+    }
+
+    /**
+     * OpenSSL OFB Processor
+     *
+     * PHP's OpenSSL bindings do not operate in continuous mode so we'll wrap around it. Since the keystream
+     * for OFB is the same for both encrypting and decrypting this function is re-used by both Crypt_Base::encrypt()
+     * and Crypt_Base::decrypt().
+     *
+     * @see self::encrypt()
+     * @see self::decrypt()
+     * @param string $plaintext
+     * @param string $encryptIV
+     * @param array $buffer
+     * @return string
+     * @access private
+     */
+    function _openssl_ofb_process($plaintext, &$encryptIV, &$buffer)
+    {
+        if (strlen($buffer['xor'])) {
+            $ciphertext = $plaintext ^ $buffer['xor'];
+            $buffer['xor'] = substr($buffer['xor'], strlen($ciphertext));
+            $plaintext = substr($plaintext, strlen($ciphertext));
+        } else {
+            $ciphertext = '';
+        }
+
+        $block_size = $this->block_size;
+
+        $len = strlen($plaintext);
+        $key = $this->key;
+        $overflow = $len % $block_size;
+
+        if (strlen($plaintext)) {
+            if ($overflow) {
+                $ciphertext.= openssl_encrypt(substr($plaintext, 0, -$overflow) . str_repeat("\0", $block_size), $this->cipher_name_openssl, $key, $this->openssl_options, $encryptIV);
+                $xor = $this->_string_pop($ciphertext, $block_size);
+                if ($this->continuousBuffer) {
+                    $encryptIV = $xor;
+                }
+                $ciphertext.= $this->_string_shift($xor, $overflow) ^ substr($plaintext, -$overflow);
+                if ($this->continuousBuffer) {
+                    $buffer['xor'] = $xor;
+                }
+            } else {
+                $ciphertext = openssl_encrypt($plaintext, $this->cipher_name_openssl, $key, $this->openssl_options, $encryptIV);
+                if ($this->continuousBuffer) {
+                    $encryptIV = substr($ciphertext, -$block_size) ^ substr($plaintext, -$block_size);
+                }
+            }
+        }
+
+        return $ciphertext;
+    }
+
+    /**
+     * phpseclib <-> OpenSSL Mode Mapper
+     *
+     * May need to be overwritten by classes extending this one in some cases
+     *
+     * @return int
+     * @access private
+     */
+    function _openssl_translate_mode()
+    {
+        switch ($this->mode) {
+            case CRYPT_MODE_ECB:
+                return 'ecb';
+            case CRYPT_MODE_CBC:
+                return 'cbc';
+            case CRYPT_MODE_CTR:
+                return 'ctr';
+            case CRYPT_MODE_CFB:
+                return 'cfb';
+            case CRYPT_MODE_OFB:
+                return 'ofb';
+        }
+    }
+
+    /**
+     * Pad "packets".
+     *
+     * Block ciphers working by encrypting between their specified [$this->]block_size at a time
+     * If you ever need to encrypt or decrypt something that isn't of the proper length, it becomes necessary to
+     * pad the input so that it is of the proper length.
+     *
+     * Padding is enabled by default.  Sometimes, however, it is undesirable to pad strings.  Such is the case in SSH,
+     * where "packets" are padded with random bytes before being encrypted.  Unpad these packets and you risk stripping
+     * away characters that shouldn't be stripped away. (SSH knows how many bytes are added because the length is
+     * transmitted separately)
+     *
+     * @see self::disablePadding()
+     * @access public
+     */
+    function enablePadding()
+    {
+        $this->padding = true;
+    }
+
+    /**
+     * Do not pad packets.
+     *
+     * @see self::enablePadding()
+     * @access public
+     */
+    function disablePadding()
+    {
+        $this->padding = false;
+    }
+
+    /**
+     * Treat consecutive "packets" as if they are a continuous buffer.
+     *
+     * Say you have a 32-byte plaintext $plaintext.  Using the default behavior, the two following code snippets
+     * will yield different outputs:
+     *
+     * <code>
+     *    echo $rijndael->encrypt(substr($plaintext,  0, 16));
+     *    echo $rijndael->encrypt(substr($plaintext, 16, 16));
+     * </code>
+     * <code>
+     *    echo $rijndael->encrypt($plaintext);
+     * </code>
+     *
+     * The solution is to enable the continuous buffer.  Although this will resolve the above discrepancy, it creates
+     * another, as demonstrated with the following:
+     *
+     * <code>
+     *    $rijndael->encrypt(substr($plaintext, 0, 16));
+     *    echo $rijndael->decrypt($rijndael->encrypt(substr($plaintext, 16, 16)));
+     * </code>
+     * <code>
+     *    echo $rijndael->decrypt($rijndael->encrypt(substr($plaintext, 16, 16)));
+     * </code>
+     *
+     * With the continuous buffer disabled, these would yield the same output.  With it enabled, they yield different
+     * outputs.  The reason is due to the fact that the initialization vector's change after every encryption /
+     * decryption round when the continuous buffer is enabled.  When it's disabled, they remain constant.
+     *
+     * Put another way, when the continuous buffer is enabled, the state of the Crypt_*() object changes after each
+     * encryption / decryption round, whereas otherwise, it'd remain constant.  For this reason, it's recommended that
+     * continuous buffers not be used.  They do offer better security and are, in fact, sometimes required (SSH uses them),
+     * however, they are also less intuitive and more likely to cause you problems.
+     *
+     * @see self::disableContinuousBuffer()
+     * @access public
+     * @internal Could, but not must, extend by the child Crypt_* class
+     */
+    function enableContinuousBuffer()
+    {
+        if ($this->mode == CRYPT_MODE_ECB) {
+            return;
+        }
+
+        $this->continuousBuffer = true;
+
+        $this->_setEngine();
+    }
+
+    /**
+     * Treat consecutive packets as if they are a discontinuous buffer.
+     *
+     * The default behavior.
+     *
+     * @see self::enableContinuousBuffer()
+     * @access public
+     * @internal Could, but not must, extend by the child Crypt_* class
+     */
+    function disableContinuousBuffer()
+    {
+        if ($this->mode == CRYPT_MODE_ECB) {
+            return;
+        }
+        if (!$this->continuousBuffer) {
+            return;
+        }
+
+        $this->continuousBuffer = false;
+        $this->changed = true;
+
+        $this->_setEngine();
+    }
+
+    /**
+     * Test for engine validity
+     *
+     * @see self::Crypt_Base()
+     * @param int $engine
+     * @access public
+     * @return bool
+     */
+    function isValidEngine($engine)
+    {
+        switch ($engine) {
+            case CRYPT_ENGINE_OPENSSL:
+                if ($this->mode == CRYPT_MODE_STREAM && $this->continuousBuffer) {
+                    return false;
+                }
+                $this->openssl_emulate_ctr = false;
+                $result = $this->cipher_name_openssl &&
+                          extension_loaded('openssl') &&
+                          // PHP 5.3.0 - 5.3.2 did not let you set IV's
+                          version_compare(PHP_VERSION, '5.3.3', '>=');
+                if (!$result) {
+                    return false;
+                }
+
+                // prior to PHP 5.4.0 OPENSSL_RAW_DATA and OPENSSL_ZERO_PADDING were not defined. instead of expecting an integer
+                // $options openssl_encrypt expected a boolean $raw_data.
+                if (!defined('OPENSSL_RAW_DATA')) {
+                    $this->openssl_options = true;
+                } else {
+                    $this->openssl_options = OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING;
+                }
+
+                $methods = openssl_get_cipher_methods();
+                if (in_array($this->cipher_name_openssl, $methods)) {
+                    return true;
+                }
+                // not all of openssl's symmetric cipher's support ctr. for those
+                // that don't we'll emulate it
+                switch ($this->mode) {
+                    case CRYPT_MODE_CTR:
+                        if (in_array($this->cipher_name_openssl_ecb, $methods)) {
+                            $this->openssl_emulate_ctr = true;
+                            return true;
+                        }
+                }
+                return false;
+            case CRYPT_ENGINE_MCRYPT:
+                return $this->cipher_name_mcrypt &&
+                       extension_loaded('mcrypt') &&
+                       in_array($this->cipher_name_mcrypt, @mcrypt_list_algorithms());
+            case CRYPT_ENGINE_INTERNAL:
+                return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * Sets the preferred crypt engine
+     *
+     * Currently, $engine could be:
+     *
+     * - CRYPT_ENGINE_OPENSSL  [very fast]
+     *
+     * - CRYPT_ENGINE_MCRYPT   [fast]
+     *
+     * - CRYPT_ENGINE_INTERNAL [slow]
+     *
+     * If the preferred crypt engine is not available the fastest available one will be used
+     *
+     * @see self::Crypt_Base()
+     * @param int $engine
+     * @access public
+     */
+    function setPreferredEngine($engine)
+    {
+        switch ($engine) {
+            //case CRYPT_ENGINE_OPENSSL:
+            case CRYPT_ENGINE_MCRYPT:
+            case CRYPT_ENGINE_INTERNAL:
+                $this->preferredEngine = $engine;
+                break;
+            default:
+                $this->preferredEngine = CRYPT_ENGINE_OPENSSL;
+        }
+
+        $this->_setEngine();
+    }
+
+    /**
+     * Returns the engine currently being utilized
+     *
+     * @see self::_setEngine()
+     * @access public
+     */
+    function getEngine()
+    {
+        return $this->engine;
+    }
+
+    /**
+     * Sets the engine as appropriate
+     *
+     * @see self::Crypt_Base()
+     * @access private
+     */
+    function _setEngine()
+    {
+        $this->engine = null;
+
+        $candidateEngines = array(
+            $this->preferredEngine,
+            CRYPT_ENGINE_OPENSSL,
+            CRYPT_ENGINE_MCRYPT
+        );
+        foreach ($candidateEngines as $engine) {
+            if ($this->isValidEngine($engine)) {
+                $this->engine = $engine;
+                break;
+            }
+        }
+        if (!$this->engine) {
+            $this->engine = CRYPT_ENGINE_INTERNAL;
+        }
+
+        if ($this->engine != CRYPT_ENGINE_MCRYPT && $this->enmcrypt) {
+            // Closing the current mcrypt resource(s). _mcryptSetup() will, if needed,
+            // (re)open them with the module named in $this->cipher_name_mcrypt
+            @mcrypt_module_close($this->enmcrypt);
+            @mcrypt_module_close($this->demcrypt);
+            $this->enmcrypt = null;
+            $this->demcrypt = null;
+
+            if ($this->ecb) {
+                @mcrypt_module_close($this->ecb);
+                $this->ecb = null;
+            }
+        }
+
+        $this->changed = true;
+    }
+
+    /**
+     * Encrypts a block
+     *
+     * @access private
+     * @param string $in
+     * @return string
+     * @internal Must be extended by the child Crypt_* class
+     */
+    function _encryptBlock($in)
+    {
+        user_error((version_compare(PHP_VERSION, '5.0.0', '>=')  ? __METHOD__ : __FUNCTION__)  . '() must extend by class ' . get_class($this), E_USER_ERROR);
+    }
+
+    /**
+     * Decrypts a block
+     *
+     * @access private
+     * @param string $in
+     * @return string
+     * @internal Must be extended by the child Crypt_* class
+     */
+    function _decryptBlock($in)
+    {
+        user_error((version_compare(PHP_VERSION, '5.0.0', '>=')  ? __METHOD__ : __FUNCTION__)  . '() must extend by class ' . get_class($this), E_USER_ERROR);
+    }
+
+    /**
+     * Setup the key (expansion)
+     *
+     * Only used if $engine == CRYPT_ENGINE_INTERNAL
+     *
+     * @see self::_setup()
+     * @access private
+     * @internal Must be extended by the child Crypt_* class
+     */
+    function _setupKey()
+    {
+        user_error((version_compare(PHP_VERSION, '5.0.0', '>=')  ? __METHOD__ : __FUNCTION__)  . '() must extend by class ' . get_class($this), E_USER_ERROR);
+    }
+
+    /**
+     * Setup the CRYPT_ENGINE_INTERNAL $engine
+     *
+     * (re)init, if necessary, the internal cipher $engine and flush all $buffers
+     * Used (only) if $engine == CRYPT_ENGINE_INTERNAL
+     *
+     * _setup() will be called each time if $changed === true
+     * typically this happens when using one or more of following public methods:
+     *
+     * - setKey()
+     *
+     * - setIV()
+     *
+     * - disableContinuousBuffer()
+     *
+     * - First run of encrypt() / decrypt() with no init-settings
+     *
+     * @see self::setKey()
+     * @see self::setIV()
+     * @see self::disableContinuousBuffer()
+     * @access private
+     * @internal _setup() is always called before en/decryption.
+     * @internal Could, but not must, extend by the child Crypt_* class
+     */
+    function _setup()
+    {
+        $this->_clearBuffers();
+        $this->_setupKey();
+
+        if ($this->use_inline_crypt) {
+            $this->_setupInlineCrypt();
+        }
+    }
+
+    /**
+     * Setup the CRYPT_ENGINE_MCRYPT $engine
+     *
+     * (re)init, if necessary, the (ext)mcrypt resources and flush all $buffers
+     * Used (only) if $engine = CRYPT_ENGINE_MCRYPT
+     *
+     * _setupMcrypt() will be called each time if $changed === true
+     * typically this happens when using one or more of following public methods:
+     *
+     * - setKey()
+     *
+     * - setIV()
+     *
+     * - disableContinuousBuffer()
+     *
+     * - First run of encrypt() / decrypt()
+     *
+     * @see self::setKey()
+     * @see self::setIV()
+     * @see self::disableContinuousBuffer()
+     * @access private
+     * @internal Could, but not must, extend by the child Crypt_* class
+     */
+    function _setupMcrypt()
+    {
+        $this->_clearBuffers();
+        $this->enchanged = $this->dechanged = true;
+
+        if (!isset($this->enmcrypt)) {
+            static $mcrypt_modes = array(
+                CRYPT_MODE_CTR    => 'ctr',
+                CRYPT_MODE_ECB    => MCRYPT_MODE_ECB,
+                CRYPT_MODE_CBC    => MCRYPT_MODE_CBC,
+                CRYPT_MODE_CFB    => 'ncfb',
+                CRYPT_MODE_OFB    => MCRYPT_MODE_NOFB,
+                CRYPT_MODE_STREAM => MCRYPT_MODE_STREAM,
+            );
+
+            $this->demcrypt = @mcrypt_module_open($this->cipher_name_mcrypt, '', $mcrypt_modes[$this->mode], '');
+            $this->enmcrypt = @mcrypt_module_open($this->cipher_name_mcrypt, '', $mcrypt_modes[$this->mode], '');
+
+            // we need the $ecb mcrypt resource (only) in MODE_CFB with enableContinuousBuffer()
+            // to workaround mcrypt's broken ncfb implementation in buffered mode
+            // see: {@link http://phpseclib.sourceforge.net/cfb-demo.phps}
+            if ($this->mode == CRYPT_MODE_CFB) {
+                $this->ecb = @mcrypt_module_open($this->cipher_name_mcrypt, '', MCRYPT_MODE_ECB, '');
+            }
+        } // else should mcrypt_generic_deinit be called?
+
+        if ($this->mode == CRYPT_MODE_CFB) {
+            @mcrypt_generic_init($this->ecb, $this->key, str_repeat("\0", $this->block_size));
+        }
+    }
+
+    /**
+     * Pads a string
+     *
+     * Pads a string using the RSA PKCS padding standards so that its length is a multiple of the blocksize.
+     * $this->block_size - (strlen($text) % $this->block_size) bytes are added, each of which is equal to
+     * chr($this->block_size - (strlen($text) % $this->block_size)
+     *
+     * If padding is disabled and $text is not a multiple of the blocksize, the string will be padded regardless
+     * and padding will, hence forth, be enabled.
+     *
+     * @see self::_unpad()
+     * @param string $text
+     * @access private
+     * @return string
+     */
+    function _pad($text)
+    {
+        $length = strlen($text);
+
+        if (!$this->padding) {
+            if ($length % $this->block_size == 0) {
+                return $text;
+            } else {
+                user_error("The plaintext's length ($length) is not a multiple of the block size ({$this->block_size})");
+                $this->padding = true;
+            }
+        }
+
+        $pad = $this->block_size - ($length % $this->block_size);
+
+        return str_pad($text, $length + $pad, chr($pad));
+    }
+
+    /**
+     * Unpads a string.
+     *
+     * If padding is enabled and the reported padding length is invalid the encryption key will be assumed to be wrong
+     * and false will be returned.
+     *
+     * @see self::_pad()
+     * @param string $text
+     * @access private
+     * @return string
+     */
+    function _unpad($text)
+    {
+        if (!$this->padding) {
+            return $text;
+        }
+
+        $length = ord($text[strlen($text) - 1]);
+
+        if (!$length || $length > $this->block_size) {
+            return false;
+        }
+
+        return substr($text, 0, -$length);
+    }
+
+    /**
+     * Clears internal buffers
+     *
+     * Clearing/resetting the internal buffers is done everytime
+     * after disableContinuousBuffer() or on cipher $engine (re)init
+     * ie after setKey() or setIV()
+     *
+     * @access public
+     * @internal Could, but not must, extend by the child Crypt_* class
+     */
+    function _clearBuffers()
+    {
+        $this->enbuffer = $this->debuffer = array('ciphertext' => '', 'xor' => '', 'pos' => 0, 'enmcrypt_init' => true);
+
+        // mcrypt's handling of invalid's $iv:
+        // $this->encryptIV = $this->decryptIV = strlen($this->iv) == $this->block_size ? $this->iv : str_repeat("\0", $this->block_size);
+        $this->encryptIV = $this->decryptIV = str_pad(substr($this->iv, 0, $this->block_size), $this->block_size, "\0");
+
+        if (!$this->skip_key_adjustment) {
+            $this->key = str_pad(substr($this->key, 0, $this->key_length), $this->key_length, "\0");
+        }
+    }
+
+    /**
+     * String Shift
+     *
+     * Inspired by array_shift
+     *
+     * @param string $string
+     * @param int $index
+     * @access private
+     * @return string
+     */
+    function _string_shift(&$string, $index = 1)
+    {
+        $substr = substr($string, 0, $index);
+        $string = substr($string, $index);
+        return $substr;
+    }
+
+    /**
+     * String Pop
+     *
+     * Inspired by array_pop
+     *
+     * @param string $string
+     * @param int $index
+     * @access private
+     * @return string
+     */
+    function _string_pop(&$string, $index = 1)
+    {
+        $substr = substr($string, -$index);
+        $string = substr($string, 0, -$index);
+        return $substr;
+    }
+
+    /**
+     * Increment the current string
+     *
+     * @see self::decrypt()
+     * @see self::encrypt()
+     * @param string $var
+     * @access private
+     */
+    function _increment_str(&$var)
+    {
+        for ($i = 4; $i <= strlen($var); $i+= 4) {
+            $temp = substr($var, -$i, 4);
+            switch ($temp) {
+                case "\xFF\xFF\xFF\xFF":
+                    $var = substr_replace($var, "\x00\x00\x00\x00", -$i, 4);
+                    break;
+                case "\x7F\xFF\xFF\xFF":
+                    $var = substr_replace($var, "\x80\x00\x00\x00", -$i, 4);
+                    return;
+                default:
+                    $temp = unpack('Nnum', $temp);
+                    $var = substr_replace($var, pack('N', $temp['num'] + 1), -$i, 4);
+                    return;
+            }
+        }
+
+        $remainder = strlen($var) % 4;
+
+        if ($remainder == 0) {
+            return;
+        }
+
+        $temp = unpack('Nnum', str_pad(substr($var, 0, $remainder), 4, "\0", STR_PAD_LEFT));
+        $temp = substr(pack('N', $temp['num'] + 1), -$remainder);
+        $var = substr_replace($var, $temp, 0, $remainder);
+    }
+
+    /**
+     * Setup the performance-optimized function for de/encrypt()
+     *
+     * Stores the created (or existing) callback function-name
+     * in $this->inline_crypt
+     *
+     * Internally for phpseclib developers:
+     *
+     *     _setupInlineCrypt() would be called only if:
+     *
+     *     - $engine == CRYPT_ENGINE_INTERNAL and
+     *
+     *     - $use_inline_crypt === true
+     *
+     *     - each time on _setup(), after(!) _setupKey()
+     *
+     *
+     *     This ensures that _setupInlineCrypt() has always a
+     *     full ready2go initializated internal cipher $engine state
+     *     where, for example, the keys allready expanded,
+     *     keys/block_size calculated and such.
+     *
+     *     It is, each time if called, the responsibility of _setupInlineCrypt():
+     *
+     *     - to set $this->inline_crypt to a valid and fully working callback function
+     *       as a (faster) replacement for encrypt() / decrypt()
+     *
+     *     - NOT to create unlimited callback functions (for memory reasons!)
+     *       no matter how often _setupInlineCrypt() would be called. At some
+     *       point of amount they must be generic re-useable.
+     *
+     *     - the code of _setupInlineCrypt() it self,
+     *       and the generated callback code,
+     *       must be, in following order:
+     *       - 100% safe
+     *       - 100% compatible to encrypt()/decrypt()
+     *       - using only php5+ features/lang-constructs/php-extensions if
+     *         compatibility (down to php4) or fallback is provided
+     *       - readable/maintainable/understandable/commented and... not-cryptic-styled-code :-)
+     *       - >= 10% faster than encrypt()/decrypt() [which is, by the way,
+     *         the reason for the existence of _setupInlineCrypt() :-)]
+     *       - memory-nice
+     *       - short (as good as possible)
+     *
+     * Note: - _setupInlineCrypt() is using _createInlineCryptFunction() to create the full callback function code.
+     *       - In case of using inline crypting, _setupInlineCrypt() must extend by the child Crypt_* class.
+     *       - The following variable names are reserved:
+     *         - $_*  (all variable names prefixed with an underscore)
+     *         - $self (object reference to it self. Do not use $this, but $self instead)
+     *         - $in (the content of $in has to en/decrypt by the generated code)
+     *       - The callback function should not use the 'return' statement, but en/decrypt'ing the content of $in only
+     *
+     *
+     * @see self::_setup()
+     * @see self::_createInlineCryptFunction()
+     * @see self::encrypt()
+     * @see self::decrypt()
+     * @access private
+     * @internal If a Crypt_* class providing inline crypting it must extend _setupInlineCrypt()
+     */
+    function _setupInlineCrypt()
+    {
+        // If, for any reason, an extending Crypt_Base() Crypt_* class
+        // not using inline crypting then it must be ensured that: $this->use_inline_crypt = false
+        // ie in the class var declaration of $use_inline_crypt in general for the Crypt_* class,
+        // in the constructor at object instance-time
+        // or, if it's runtime-specific, at runtime
+
+        $this->use_inline_crypt = false;
+    }
+
+    /**
+     * Creates the performance-optimized function for en/decrypt()
+     *
+     * Internally for phpseclib developers:
+     *
+     *    _createInlineCryptFunction():
+     *
+     *    - merge the $cipher_code [setup'ed by _setupInlineCrypt()]
+     *      with the current [$this->]mode of operation code
+     *
+     *    - create the $inline function, which called by encrypt() / decrypt()
+     *      as its replacement to speed up the en/decryption operations.
+     *
+     *    - return the name of the created $inline callback function
+     *
+     *    - used to speed up en/decryption
+     *
+     *
+     *
+     *    The main reason why can speed up things [up to 50%] this way are:
+     *
+     *    - using variables more effective then regular.
+     *      (ie no use of expensive arrays but integers $k_0, $k_1 ...
+     *      or even, for example, the pure $key[] values hardcoded)
+     *
+     *    - avoiding 1000's of function calls of ie _encryptBlock()
+     *      but inlining the crypt operations.
+     *      in the mode of operation for() loop.
+     *
+     *    - full loop unroll the (sometimes key-dependent) rounds
+     *      avoiding this way ++$i counters and runtime-if's etc...
+     *
+     *    The basic code architectur of the generated $inline en/decrypt()
+     *    lambda function, in pseudo php, is:
+     *
+     *    <code>
+     *    +----------------------------------------------------------------------------------------------+
+     *    | callback $inline = create_function:                                                          |
+     *    | lambda_function_0001_crypt_ECB($action, $text)                                               |
+     *    | {                                                                                            |
+     *    |     INSERT PHP CODE OF:                                                                      |
+     *    |     $cipher_code['init_crypt'];                  // general init code.                       |
+     *    |                                                  // ie: $sbox'es declarations used for       |
+     *    |                                                  //     encrypt and decrypt'ing.             |
+     *    |                                                                                              |
+     *    |     switch ($action) {                                                                       |
+     *    |         case 'encrypt':                                                                      |
+     *    |             INSERT PHP CODE OF:                                                              |
+     *    |             $cipher_code['init_encrypt'];       // encrypt sepcific init code.               |
+     *    |                                                    ie: specified $key or $box                |
+     *    |                                                        declarations for encrypt'ing.         |
+     *    |                                                                                              |
+     *    |             foreach ($ciphertext) {                                                          |
+     *    |                 $in = $block_size of $ciphertext;                                            |
+     *    |                                                                                              |
+     *    |                 INSERT PHP CODE OF:                                                          |
+     *    |                 $cipher_code['encrypt_block'];  // encrypt's (string) $in, which is always:  |
+     *    |                                                 // strlen($in) == $this->block_size          |
+     *    |                                                 // here comes the cipher algorithm in action |
+     *    |                                                 // for encryption.                           |
+     *    |                                                 // $cipher_code['encrypt_block'] has to      |
+     *    |                                                 // encrypt the content of the $in variable   |
+     *    |                                                                                              |
+     *    |                 $plaintext .= $in;                                                           |
+     *    |             }                                                                                |
+     *    |             return $plaintext;                                                               |
+     *    |                                                                                              |
+     *    |         case 'decrypt':                                                                      |
+     *    |             INSERT PHP CODE OF:                                                              |
+     *    |             $cipher_code['init_decrypt'];       // decrypt sepcific init code                |
+     *    |                                                    ie: specified $key or $box                |
+     *    |                                                        declarations for decrypt'ing.         |
+     *    |             foreach ($plaintext) {                                                           |
+     *    |                 $in = $block_size of $plaintext;                                             |
+     *    |                                                                                              |
+     *    |                 INSERT PHP CODE OF:                                                          |
+     *    |                 $cipher_code['decrypt_block'];  // decrypt's (string) $in, which is always   |
+     *    |                                                 // strlen($in) == $this->block_size          |
+     *    |                                                 // here comes the cipher algorithm in action |
+     *    |                                                 // for decryption.                           |
+     *    |                                                 // $cipher_code['decrypt_block'] has to      |
+     *    |                                                 // decrypt the content of the $in variable   |
+     *    |                 $ciphertext .= $in;                                                          |
+     *    |             }                                                                                |
+     *    |             return $ciphertext;                                                              |
+     *    |     }                                                                                        |
+     *    | }                                                                                            |
+     *    +----------------------------------------------------------------------------------------------+
+     *    </code>
+     *
+     *    See also the Crypt_*::_setupInlineCrypt()'s for
+     *    productive inline $cipher_code's how they works.
+     *
+     *    Structure of:
+     *    <code>
+     *    $cipher_code = array(
+     *        'init_crypt'    => (string) '', // optional
+     *        'init_encrypt'  => (string) '', // optional
+     *        'init_decrypt'  => (string) '', // optional
+     *        'encrypt_block' => (string) '', // required
+     *        'decrypt_block' => (string) ''  // required
+     *    );
+     *    </code>
+     *
+     * @see self::_setupInlineCrypt()
+     * @see self::encrypt()
+     * @see self::decrypt()
+     * @param array $cipher_code
+     * @access private
+     * @return string (the name of the created callback function)
+     */
+    function _createInlineCryptFunction($cipher_code)
+    {
+        $block_size = $this->block_size;
+
+        // optional
+        $init_crypt    = isset($cipher_code['init_crypt'])    ? $cipher_code['init_crypt']    : '';
+        $init_encrypt  = isset($cipher_code['init_encrypt'])  ? $cipher_code['init_encrypt']  : '';
+        $init_decrypt  = isset($cipher_code['init_decrypt'])  ? $cipher_code['init_decrypt']  : '';
+        // required
+        $encrypt_block = $cipher_code['encrypt_block'];
+        $decrypt_block = $cipher_code['decrypt_block'];
+
+        // Generating mode of operation inline code,
+        // merged with the $cipher_code algorithm
+        // for encrypt- and decryption.
+        switch ($this->mode) {
+            case CRYPT_MODE_ECB:
+                $encrypt = $init_encrypt . '
+                    $_ciphertext = "";
+                    $_plaintext_len = strlen($_text);
+
+                    for ($_i = 0; $_i < $_plaintext_len; $_i+= '.$block_size.') {
+                        $in = substr($_text, $_i, '.$block_size.');
+                        '.$encrypt_block.'
+                        $_ciphertext.= $in;
+                    }
+
+                    return $_ciphertext;
+                    ';
+
+                $decrypt = $init_decrypt . '
+                    $_plaintext = "";
+                    $_text = str_pad($_text, strlen($_text) + ('.$block_size.' - strlen($_text) % '.$block_size.') % '.$block_size.', chr(0));
+                    $_ciphertext_len = strlen($_text);
+
+                    for ($_i = 0; $_i < $_ciphertext_len; $_i+= '.$block_size.') {
+                        $in = substr($_text, $_i, '.$block_size.');
+                        '.$decrypt_block.'
+                        $_plaintext.= $in;
+                    }
+
+                    return $self->_unpad($_plaintext);
+                    ';
+                break;
+            case CRYPT_MODE_CTR:
+                $encrypt = $init_encrypt . '
+                    $_ciphertext = "";
+                    $_plaintext_len = strlen($_text);
+                    $_xor = $self->encryptIV;
+                    $_buffer = &$self->enbuffer;
+                    if (strlen($_buffer["ciphertext"])) {
+                        for ($_i = 0; $_i < $_plaintext_len; $_i+= '.$block_size.') {
+                            $_block = substr($_text, $_i, '.$block_size.');
+                            if (strlen($_block) > strlen($_buffer["ciphertext"])) {
+                                $in = $_xor;
+                                '.$encrypt_block.'
+                                $self->_increment_str($_xor);
+                                $_buffer["ciphertext"].= $in;
+                            }
+                            $_key = $self->_string_shift($_buffer["ciphertext"], '.$block_size.');
+                            $_ciphertext.= $_block ^ $_key;
+                        }
+                    } else {
+                        for ($_i = 0; $_i < $_plaintext_len; $_i+= '.$block_size.') {
+                            $_block = substr($_text, $_i, '.$block_size.');
+                            $in = $_xor;
+                            '.$encrypt_block.'
+                            $self->_increment_str($_xor);
+                            $_key = $in;
+                            $_ciphertext.= $_block ^ $_key;
+                        }
+                    }
+                    if ($self->continuousBuffer) {
+                        $self->encryptIV = $_xor;
+                        if ($_start = $_plaintext_len % '.$block_size.') {
+                            $_buffer["ciphertext"] = substr($_key, $_start) . $_buffer["ciphertext"];
+                        }
+                    }
+
+                    return $_ciphertext;
+                ';
+
+                $decrypt = $init_encrypt . '
+                    $_plaintext = "";
+                    $_ciphertext_len = strlen($_text);
+                    $_xor = $self->decryptIV;
+                    $_buffer = &$self->debuffer;
+
+                    if (strlen($_buffer["ciphertext"])) {
+                        for ($_i = 0; $_i < $_ciphertext_len; $_i+= '.$block_size.') {
+                            $_block = substr($_text, $_i, '.$block_size.');
+                            if (strlen($_block) > strlen($_buffer["ciphertext"])) {
+                                $in = $_xor;
+                                '.$encrypt_block.'
+                                $self->_increment_str($_xor);
+                                $_buffer["ciphertext"].= $in;
+                            }
+                            $_key = $self->_string_shift($_buffer["ciphertext"], '.$block_size.');
+                            $_plaintext.= $_block ^ $_key;
+                        }
+                    } else {
+                        for ($_i = 0; $_i < $_ciphertext_len; $_i+= '.$block_size.') {
+                            $_block = substr($_text, $_i, '.$block_size.');
+                            $in = $_xor;
+                            '.$encrypt_block.'
+                            $self->_increment_str($_xor);
+                            $_key = $in;
+                            $_plaintext.= $_block ^ $_key;
+                        }
+                    }
+                    if ($self->continuousBuffer) {
+                        $self->decryptIV = $_xor;
+                        if ($_start = $_ciphertext_len % '.$block_size.') {
+                            $_buffer["ciphertext"] = substr($_key, $_start) . $_buffer["ciphertext"];
+                        }
+                    }
+
+                    return $_plaintext;
+                    ';
+                break;
+            case CRYPT_MODE_CFB:
+                $encrypt = $init_encrypt . '
+                    $_ciphertext = "";
+                    $_buffer = &$self->enbuffer;
+
+                    if ($self->continuousBuffer) {
+                        $_iv = &$self->encryptIV;
+                        $_pos = &$_buffer["pos"];
+                    } else {
+                        $_iv = $self->encryptIV;
+                        $_pos = 0;
+                    }
+                    $_len = strlen($_text);
+                    $_i = 0;
+                    if ($_pos) {
+                        $_orig_pos = $_pos;
+                        $_max = '.$block_size.' - $_pos;
+                        if ($_len >= $_max) {
+                            $_i = $_max;
+                            $_len-= $_max;
+                            $_pos = 0;
+                        } else {
+                            $_i = $_len;
+                            $_pos+= $_len;
+                            $_len = 0;
+                        }
+                        $_ciphertext = substr($_iv, $_orig_pos) ^ $_text;
+                        $_iv = substr_replace($_iv, $_ciphertext, $_orig_pos, $_i);
+                    }
+                    while ($_len >= '.$block_size.') {
+                        $in = $_iv;
+                        '.$encrypt_block.';
+                        $_iv = $in ^ substr($_text, $_i, '.$block_size.');
+                        $_ciphertext.= $_iv;
+                        $_len-= '.$block_size.';
+                        $_i+= '.$block_size.';
+                    }
+                    if ($_len) {
+                        $in = $_iv;
+                        '.$encrypt_block.'
+                        $_iv = $in;
+                        $_block = $_iv ^ substr($_text, $_i);
+                        $_iv = substr_replace($_iv, $_block, 0, $_len);
+                        $_ciphertext.= $_block;
+                        $_pos = $_len;
+                    }
+                    return $_ciphertext;
+                ';
+
+                $decrypt = $init_encrypt . '
+                    $_plaintext = "";
+                    $_buffer = &$self->debuffer;
+
+                    if ($self->continuousBuffer) {
+                        $_iv = &$self->decryptIV;
+                        $_pos = &$_buffer["pos"];
+                    } else {
+                        $_iv = $self->decryptIV;
+                        $_pos = 0;
+                    }
+                    $_len = strlen($_text);
+                    $_i = 0;
+                    if ($_pos) {
+                        $_orig_pos = $_pos;
+                        $_max = '.$block_size.' - $_pos;
+                        if ($_len >= $_max) {
+                            $_i = $_max;
+                            $_len-= $_max;
+                            $_pos = 0;
+                        } else {
+                            $_i = $_len;
+                            $_pos+= $_len;
+                            $_len = 0;
+                        }
+                        $_plaintext = substr($_iv, $_orig_pos) ^ $_text;
+                        $_iv = substr_replace($_iv, substr($_text, 0, $_i), $_orig_pos, $_i);
+                    }
+                    while ($_len >= '.$block_size.') {
+                        $in = $_iv;
+                        '.$encrypt_block.'
+                        $_iv = $in;
+                        $cb = substr($_text, $_i, '.$block_size.');
+                        $_plaintext.= $_iv ^ $cb;
+                        $_iv = $cb;
+                        $_len-= '.$block_size.';
+                        $_i+= '.$block_size.';
+                    }
+                    if ($_len) {
+                        $in = $_iv;
+                        '.$encrypt_block.'
+                        $_iv = $in;
+                        $_plaintext.= $_iv ^ substr($_text, $_i);
+                        $_iv = substr_replace($_iv, substr($_text, $_i), 0, $_len);
+                        $_pos = $_len;
+                    }
+
+                    return $_plaintext;
+                    ';
+                break;
+            case CRYPT_MODE_OFB:
+                $encrypt = $init_encrypt . '
+                    $_ciphertext = "";
+                    $_plaintext_len = strlen($_text);
+                    $_xor = $self->encryptIV;
+                    $_buffer = &$self->enbuffer;
+
+                    if (strlen($_buffer["xor"])) {
+                        for ($_i = 0; $_i < $_plaintext_len; $_i+= '.$block_size.') {
+                            $_block = substr($_text, $_i, '.$block_size.');
+                            if (strlen($_block) > strlen($_buffer["xor"])) {
+                                $in = $_xor;
+                                '.$encrypt_block.'
+                                $_xor = $in;
+                                $_buffer["xor"].= $_xor;
+                            }
+                            $_key = $self->_string_shift($_buffer["xor"], '.$block_size.');
+                            $_ciphertext.= $_block ^ $_key;
+                        }
+                    } else {
+                        for ($_i = 0; $_i < $_plaintext_len; $_i+= '.$block_size.') {
+                            $in = $_xor;
+                            '.$encrypt_block.'
+                            $_xor = $in;
+                            $_ciphertext.= substr($_text, $_i, '.$block_size.') ^ $_xor;
+                        }
+                        $_key = $_xor;
+                    }
+                    if ($self->continuousBuffer) {
+                        $self->encryptIV = $_xor;
+                        if ($_start = $_plaintext_len % '.$block_size.') {
+                             $_buffer["xor"] = substr($_key, $_start) . $_buffer["xor"];
+                        }
+                    }
+                    return $_ciphertext;
+                    ';
+
+                $decrypt = $init_encrypt . '
+                    $_plaintext = "";
+                    $_ciphertext_len = strlen($_text);
+                    $_xor = $self->decryptIV;
+                    $_buffer = &$self->debuffer;
+
+                    if (strlen($_buffer["xor"])) {
+                        for ($_i = 0; $_i < $_ciphertext_len; $_i+= '.$block_size.') {
+                            $_block = substr($_text, $_i, '.$block_size.');
+                            if (strlen($_block) > strlen($_buffer["xor"])) {
+                                $in = $_xor;
+                                '.$encrypt_block.'
+                                $_xor = $in;
+                                $_buffer["xor"].= $_xor;
+                            }
+                            $_key = $self->_string_shift($_buffer["xor"], '.$block_size.');
+                            $_plaintext.= $_block ^ $_key;
+                        }
+                    } else {
+                        for ($_i = 0; $_i < $_ciphertext_len; $_i+= '.$block_size.') {
+                            $in = $_xor;
+                            '.$encrypt_block.'
+                            $_xor = $in;
+                            $_plaintext.= substr($_text, $_i, '.$block_size.') ^ $_xor;
+                        }
+                        $_key = $_xor;
+                    }
+                    if ($self->continuousBuffer) {
+                        $self->decryptIV = $_xor;
+                        if ($_start = $_ciphertext_len % '.$block_size.') {
+                             $_buffer["xor"] = substr($_key, $_start) . $_buffer["xor"];
+                        }
+                    }
+                    return $_plaintext;
+                    ';
+                break;
+            case CRYPT_MODE_STREAM:
+                $encrypt = $init_encrypt . '
+                    $_ciphertext = "";
+                    '.$encrypt_block.'
+                    return $_ciphertext;
+                    ';
+                $decrypt = $init_decrypt . '
+                    $_plaintext = "";
+                    '.$decrypt_block.'
+                    return $_plaintext;
+                    ';
+                break;
+            // case CRYPT_MODE_CBC:
+            default:
+                $encrypt = $init_encrypt . '
+                    $_ciphertext = "";
+                    $_plaintext_len = strlen($_text);
+
+                    $in = $self->encryptIV;
+
+                    for ($_i = 0; $_i < $_plaintext_len; $_i+= '.$block_size.') {
+                        $in = substr($_text, $_i, '.$block_size.') ^ $in;
+                        '.$encrypt_block.'
+                        $_ciphertext.= $in;
+                    }
+
+                    if ($self->continuousBuffer) {
+                        $self->encryptIV = $in;
+                    }
+
+                    return $_ciphertext;
+                    ';
+
+                $decrypt = $init_decrypt . '
+                    $_plaintext = "";
+                    $_text = str_pad($_text, strlen($_text) + ('.$block_size.' - strlen($_text) % '.$block_size.') % '.$block_size.', chr(0));
+                    $_ciphertext_len = strlen($_text);
+
+                    $_iv = $self->decryptIV;
+
+                    for ($_i = 0; $_i < $_ciphertext_len; $_i+= '.$block_size.') {
+                        $in = $_block = substr($_text, $_i, '.$block_size.');
+                        '.$decrypt_block.'
+                        $_plaintext.= $in ^ $_iv;
+                        $_iv = $_block;
+                    }
+
+                    if ($self->continuousBuffer) {
+                        $self->decryptIV = $_iv;
+                    }
+
+                    return $self->_unpad($_plaintext);
+                    ';
+                break;
+        }
+
+        // Create the $inline function and return its name as string. Ready to run!
+        if (version_compare(PHP_VERSION, '5.3.0') >= 0) {
+            eval('$func = function ($_action, &$self, $_text) { ' . $init_crypt . 'if ($_action == "encrypt") { ' . $encrypt . ' } else { ' . $decrypt . ' } };');
+            return $func;
+        }
+
+        return create_function('$_action, &$self, $_text', $init_crypt . 'if ($_action == "encrypt") { ' . $encrypt . ' } else { ' . $decrypt . ' }');
+    }
+
+    /**
+     * Holds the lambda_functions table (classwide)
+     *
+     * Each name of the lambda function, created from
+     * _setupInlineCrypt() && _createInlineCryptFunction()
+     * is stored, classwide (!), here for reusing.
+     *
+     * The string-based index of $function is a classwide
+     * unique value representing, at least, the $mode of
+     * operation (or more... depends of the optimizing level)
+     * for which $mode the lambda function was created.
+     *
+     * @access private
+     * @return array &$functions
+     */
+    function &_getLambdaFunctions()
+    {
+        static $functions = array();
+        return $functions;
+    }
+
+    /**
+     * Generates a digest from $bytes
+     *
+     * @see self::_setupInlineCrypt()
+     * @access private
+     * @param $bytes
+     * @return string
+     */
+    function _hashInlineCryptFunction($bytes)
+    {
+        if (!defined('CRYPT_BASE_WHIRLPOOL_AVAILABLE')) {
+            define('CRYPT_BASE_WHIRLPOOL_AVAILABLE', (bool)(extension_loaded('hash') && in_array('whirlpool', hash_algos())));
+        }
+
+        $result = '';
+        $hash = $bytes;
+
+        switch (true) {
+            case CRYPT_BASE_WHIRLPOOL_AVAILABLE:
+                foreach (str_split($bytes, 64) as $t) {
+                    $hash = hash('whirlpool', $hash, true);
+                    $result .= $t ^ $hash;
+                }
+                return $result . hash('whirlpool', $hash, true);
+            default:
+                $len = strlen($bytes);
+                for ($i = 0; $i < $len; $i+=20) {
+                    $t = substr($bytes, $i, 20);
+                    $hash = pack('H*', sha1($hash));
+                    $result .= $t ^ $hash;
+                }
+                return $result . pack('H*', sha1($hash));
+        }
+    }
+
+    /**
+     * Convert float to int
+     *
+     * On 32-bit Linux installs running PHP < 5.3 converting floats to ints doesn't always work
+     *
+     * @access private
+     * @param string $x
+     * @return int
+     */
+    function safe_intval($x)
+    {
+        switch (true) {
+            case is_int($x):
+            // PHP 5.3, per http://php.net/releases/5_3_0.php, introduced "more consistent float rounding"
+            case version_compare(PHP_VERSION, '5.3.0') >= 0 && (php_uname('m') & "\xDF\xDF\xDF") != 'ARM':
+            // PHP_OS & "\xDF\xDF\xDF" == strtoupper(substr(PHP_OS, 0, 3)), but a lot faster
+            case (PHP_OS & "\xDF\xDF\xDF") === 'WIN':
+                return $x;
+        }
+        return (fmod($x, 0x80000000) & 0x7FFFFFFF) |
+            ((fmod(floor($x / 0x80000000), 2) & 1) << 31);
+    }
+
+    /**
+     * eval()'able string for in-line float to int
+     *
+     * @access private
+     * @return string
+     */
+    function safe_intval_inline()
+    {
+        // on 32-bit linux systems with PHP < 5.3 float to integer conversion is bad
+        switch (true) {
+            case defined('PHP_INT_SIZE') && PHP_INT_SIZE == 8:
+            case version_compare(PHP_VERSION, '5.3.0') >= 0 && (php_uname('m') & "\xDF\xDF\xDF") != 'ARM':
+            case (PHP_OS & "\xDF\xDF\xDF") === 'WIN':
+                return '%s';
+                break;
+            default:
+                $safeint = '(is_int($temp = %s) ? $temp : (fmod($temp, 0x80000000) & 0x7FFFFFFF) | ';
+                return $safeint . '((fmod(floor($temp / 0x80000000), 2) & 1) << 31))';
+        }
+    }
+}
diff --git a/lib/php/phpseclib/Crypt/Blowfish.php b/lib/php/phpseclib/Crypt/Blowfish.php
new file mode 100644
index 00000000..176a3e14
--- /dev/null
+++ b/lib/php/phpseclib/Crypt/Blowfish.php
@@ -0,0 +1,644 @@
+<?php
+
+/**
+ * Pure-PHP implementation of Blowfish.
+ *
+ * Uses mcrypt, if available, and an internal implementation, otherwise.
+ *
+ * PHP versions 4 and 5
+ *
+ * Useful resources are as follows:
+ *
+ *  - {@link http://en.wikipedia.org/wiki/Blowfish_(cipher) Wikipedia description of Blowfish}
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ *    include 'Crypt/Blowfish.php';
+ *
+ *    $blowfish = new Crypt_Blowfish();
+ *
+ *    $blowfish->setKey('12345678901234567890123456789012');
+ *
+ *    $plaintext = str_repeat('a', 1024);
+ *
+ *    echo $blowfish->decrypt($blowfish->encrypt($plaintext));
+ * ?>
+ * </code>
+ *
+ * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @category  Crypt
+ * @package   Crypt_Blowfish
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @author    Hans-Juergen Petrich <petrich@tronic-media.com>
+ * @copyright 2007 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+/**
+ * Include Crypt_Base
+ *
+ * Base cipher class
+ */
+if (!class_exists('Crypt_Base')) {
+    include_once 'Base.php';
+}
+
+/**#@+
+ * @access public
+ * @see self::encrypt()
+ * @see self::decrypt()
+ */
+/**
+ * Encrypt / decrypt using the Counter mode.
+ *
+ * Set to -1 since that's what Crypt/Random.php uses to index the CTR mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Counter_.28CTR.29
+ */
+define('CRYPT_BLOWFISH_MODE_CTR', CRYPT_MODE_CTR);
+/**
+ * Encrypt / decrypt using the Electronic Code Book mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Electronic_codebook_.28ECB.29
+ */
+define('CRYPT_BLOWFISH_MODE_ECB', CRYPT_MODE_ECB);
+/**
+ * Encrypt / decrypt using the Code Book Chaining mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher-block_chaining_.28CBC.29
+ */
+define('CRYPT_BLOWFISH_MODE_CBC', CRYPT_MODE_CBC);
+/**
+ * Encrypt / decrypt using the Cipher Feedback mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher_feedback_.28CFB.29
+ */
+define('CRYPT_BLOWFISH_MODE_CFB', CRYPT_MODE_CFB);
+/**
+ * Encrypt / decrypt using the Cipher Feedback mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Output_feedback_.28OFB.29
+ */
+define('CRYPT_BLOWFISH_MODE_OFB', CRYPT_MODE_OFB);
+/**#@-*/
+
+/**
+ * Pure-PHP implementation of Blowfish.
+ *
+ * @package Crypt_Blowfish
+ * @author  Jim Wigginton <terrafrost@php.net>
+ * @author  Hans-Juergen Petrich <petrich@tronic-media.com>
+ * @access  public
+ */
+class Crypt_Blowfish extends Crypt_Base
+{
+    /**
+     * Block Length of the cipher
+     *
+     * @see Crypt_Base::block_size
+     * @var int
+     * @access private
+     */
+    var $block_size = 8;
+
+    /**
+     * The namespace used by the cipher for its constants.
+     *
+     * @see Crypt_Base::const_namespace
+     * @var string
+     * @access private
+     */
+    var $const_namespace = 'BLOWFISH';
+
+    /**
+     * The mcrypt specific name of the cipher
+     *
+     * @see Crypt_Base::cipher_name_mcrypt
+     * @var string
+     * @access private
+     */
+    var $cipher_name_mcrypt = 'blowfish';
+
+    /**
+     * Optimizing value while CFB-encrypting
+     *
+     * @see Crypt_Base::cfb_init_len
+     * @var int
+     * @access private
+     */
+    var $cfb_init_len = 500;
+
+    /**
+     * The fixed subkeys boxes ($sbox0 - $sbox3) with 256 entries each
+     *
+     * S-Box 0
+     *
+     * @access private
+     * @var    array
+     */
+    var $sbox0 = array(
+        0xd1310ba6, 0x98dfb5ac, 0x2ffd72db, 0xd01adfb7, 0xb8e1afed, 0x6a267e96, 0xba7c9045, 0xf12c7f99,
+        0x24a19947, 0xb3916cf7, 0x0801f2e2, 0x858efc16, 0x636920d8, 0x71574e69, 0xa458fea3, 0xf4933d7e,
+        0x0d95748f, 0x728eb658, 0x718bcd58, 0x82154aee, 0x7b54a41d, 0xc25a59b5, 0x9c30d539, 0x2af26013,
+        0xc5d1b023, 0x286085f0, 0xca417918, 0xb8db38ef, 0x8e79dcb0, 0x603a180e, 0x6c9e0e8b, 0xb01e8a3e,
+        0xd71577c1, 0xbd314b27, 0x78af2fda, 0x55605c60, 0xe65525f3, 0xaa55ab94, 0x57489862, 0x63e81440,
+        0x55ca396a, 0x2aab10b6, 0xb4cc5c34, 0x1141e8ce, 0xa15486af, 0x7c72e993, 0xb3ee1411, 0x636fbc2a,
+        0x2ba9c55d, 0x741831f6, 0xce5c3e16, 0x9b87931e, 0xafd6ba33, 0x6c24cf5c, 0x7a325381, 0x28958677,
+        0x3b8f4898, 0x6b4bb9af, 0xc4bfe81b, 0x66282193, 0x61d809cc, 0xfb21a991, 0x487cac60, 0x5dec8032,
+        0xef845d5d, 0xe98575b1, 0xdc262302, 0xeb651b88, 0x23893e81, 0xd396acc5, 0x0f6d6ff3, 0x83f44239,
+        0x2e0b4482, 0xa4842004, 0x69c8f04a, 0x9e1f9b5e, 0x21c66842, 0xf6e96c9a, 0x670c9c61, 0xabd388f0,
+        0x6a51a0d2, 0xd8542f68, 0x960fa728, 0xab5133a3, 0x6eef0b6c, 0x137a3be4, 0xba3bf050, 0x7efb2a98,
+        0xa1f1651d, 0x39af0176, 0x66ca593e, 0x82430e88, 0x8cee8619, 0x456f9fb4, 0x7d84a5c3, 0x3b8b5ebe,
+        0xe06f75d8, 0x85c12073, 0x401a449f, 0x56c16aa6, 0x4ed3aa62, 0x363f7706, 0x1bfedf72, 0x429b023d,
+        0x37d0d724, 0xd00a1248, 0xdb0fead3, 0x49f1c09b, 0x075372c9, 0x80991b7b, 0x25d479d8, 0xf6e8def7,
+        0xe3fe501a, 0xb6794c3b, 0x976ce0bd, 0x04c006ba, 0xc1a94fb6, 0x409f60c4, 0x5e5c9ec2, 0x196a2463,
+        0x68fb6faf, 0x3e6c53b5, 0x1339b2eb, 0x3b52ec6f, 0x6dfc511f, 0x9b30952c, 0xcc814544, 0xaf5ebd09,
+        0xbee3d004, 0xde334afd, 0x660f2807, 0x192e4bb3, 0xc0cba857, 0x45c8740f, 0xd20b5f39, 0xb9d3fbdb,
+        0x5579c0bd, 0x1a60320a, 0xd6a100c6, 0x402c7279, 0x679f25fe, 0xfb1fa3cc, 0x8ea5e9f8, 0xdb3222f8,
+        0x3c7516df, 0xfd616b15, 0x2f501ec8, 0xad0552ab, 0x323db5fa, 0xfd238760, 0x53317b48, 0x3e00df82,
+        0x9e5c57bb, 0xca6f8ca0, 0x1a87562e, 0xdf1769db, 0xd542a8f6, 0x287effc3, 0xac6732c6, 0x8c4f5573,
+        0x695b27b0, 0xbbca58c8, 0xe1ffa35d, 0xb8f011a0, 0x10fa3d98, 0xfd2183b8, 0x4afcb56c, 0x2dd1d35b,
+        0x9a53e479, 0xb6f84565, 0xd28e49bc, 0x4bfb9790, 0xe1ddf2da, 0xa4cb7e33, 0x62fb1341, 0xcee4c6e8,
+        0xef20cada, 0x36774c01, 0xd07e9efe, 0x2bf11fb4, 0x95dbda4d, 0xae909198, 0xeaad8e71, 0x6b93d5a0,
+        0xd08ed1d0, 0xafc725e0, 0x8e3c5b2f, 0x8e7594b7, 0x8ff6e2fb, 0xf2122b64, 0x8888b812, 0x900df01c,
+        0x4fad5ea0, 0x688fc31c, 0xd1cff191, 0xb3a8c1ad, 0x2f2f2218, 0xbe0e1777, 0xea752dfe, 0x8b021fa1,
+        0xe5a0cc0f, 0xb56f74e8, 0x18acf3d6, 0xce89e299, 0xb4a84fe0, 0xfd13e0b7, 0x7cc43b81, 0xd2ada8d9,
+        0x165fa266, 0x80957705, 0x93cc7314, 0x211a1477, 0xe6ad2065, 0x77b5fa86, 0xc75442f5, 0xfb9d35cf,
+        0xebcdaf0c, 0x7b3e89a0, 0xd6411bd3, 0xae1e7e49, 0x00250e2d, 0x2071b35e, 0x226800bb, 0x57b8e0af,
+        0x2464369b, 0xf009b91e, 0x5563911d, 0x59dfa6aa, 0x78c14389, 0xd95a537f, 0x207d5ba2, 0x02e5b9c5,
+        0x83260376, 0x6295cfa9, 0x11c81968, 0x4e734a41, 0xb3472dca, 0x7b14a94a, 0x1b510052, 0x9a532915,
+        0xd60f573f, 0xbc9bc6e4, 0x2b60a476, 0x81e67400, 0x08ba6fb5, 0x571be91f, 0xf296ec6b, 0x2a0dd915,
+        0xb6636521, 0xe7b9f9b6, 0xff34052e, 0xc5855664, 0x53b02d5d, 0xa99f8fa1, 0x08ba4799, 0x6e85076a
+    );
+
+    /**
+     * S-Box 1
+     *
+     * @access private
+     * @var    array
+     */
+    var $sbox1 = array(
+        0x4b7a70e9, 0xb5b32944, 0xdb75092e, 0xc4192623, 0xad6ea6b0, 0x49a7df7d, 0x9cee60b8, 0x8fedb266,
+        0xecaa8c71, 0x699a17ff, 0x5664526c, 0xc2b19ee1, 0x193602a5, 0x75094c29, 0xa0591340, 0xe4183a3e,
+        0x3f54989a, 0x5b429d65, 0x6b8fe4d6, 0x99f73fd6, 0xa1d29c07, 0xefe830f5, 0x4d2d38e6, 0xf0255dc1,
+        0x4cdd2086, 0x8470eb26, 0x6382e9c6, 0x021ecc5e, 0x09686b3f, 0x3ebaefc9, 0x3c971814, 0x6b6a70a1,
+        0x687f3584, 0x52a0e286, 0xb79c5305, 0xaa500737, 0x3e07841c, 0x7fdeae5c, 0x8e7d44ec, 0x5716f2b8,
+        0xb03ada37, 0xf0500c0d, 0xf01c1f04, 0x0200b3ff, 0xae0cf51a, 0x3cb574b2, 0x25837a58, 0xdc0921bd,
+        0xd19113f9, 0x7ca92ff6, 0x94324773, 0x22f54701, 0x3ae5e581, 0x37c2dadc, 0xc8b57634, 0x9af3dda7,
+        0xa9446146, 0x0fd0030e, 0xecc8c73e, 0xa4751e41, 0xe238cd99, 0x3bea0e2f, 0x3280bba1, 0x183eb331,
+        0x4e548b38, 0x4f6db908, 0x6f420d03, 0xf60a04bf, 0x2cb81290, 0x24977c79, 0x5679b072, 0xbcaf89af,
+        0xde9a771f, 0xd9930810, 0xb38bae12, 0xdccf3f2e, 0x5512721f, 0x2e6b7124, 0x501adde6, 0x9f84cd87,
+        0x7a584718, 0x7408da17, 0xbc9f9abc, 0xe94b7d8c, 0xec7aec3a, 0xdb851dfa, 0x63094366, 0xc464c3d2,
+        0xef1c1847, 0x3215d908, 0xdd433b37, 0x24c2ba16, 0x12a14d43, 0x2a65c451, 0x50940002, 0x133ae4dd,
+        0x71dff89e, 0x10314e55, 0x81ac77d6, 0x5f11199b, 0x043556f1, 0xd7a3c76b, 0x3c11183b, 0x5924a509,
+        0xf28fe6ed, 0x97f1fbfa, 0x9ebabf2c, 0x1e153c6e, 0x86e34570, 0xeae96fb1, 0x860e5e0a, 0x5a3e2ab3,
+        0x771fe71c, 0x4e3d06fa, 0x2965dcb9, 0x99e71d0f, 0x803e89d6, 0x5266c825, 0x2e4cc978, 0x9c10b36a,
+        0xc6150eba, 0x94e2ea78, 0xa5fc3c53, 0x1e0a2df4, 0xf2f74ea7, 0x361d2b3d, 0x1939260f, 0x19c27960,
+        0x5223a708, 0xf71312b6, 0xebadfe6e, 0xeac31f66, 0xe3bc4595, 0xa67bc883, 0xb17f37d1, 0x018cff28,
+        0xc332ddef, 0xbe6c5aa5, 0x65582185, 0x68ab9802, 0xeecea50f, 0xdb2f953b, 0x2aef7dad, 0x5b6e2f84,
+        0x1521b628, 0x29076170, 0xecdd4775, 0x619f1510, 0x13cca830, 0xeb61bd96, 0x0334fe1e, 0xaa0363cf,
+        0xb5735c90, 0x4c70a239, 0xd59e9e0b, 0xcbaade14, 0xeecc86bc, 0x60622ca7, 0x9cab5cab, 0xb2f3846e,
+        0x648b1eaf, 0x19bdf0ca, 0xa02369b9, 0x655abb50, 0x40685a32, 0x3c2ab4b3, 0x319ee9d5, 0xc021b8f7,
+        0x9b540b19, 0x875fa099, 0x95f7997e, 0x623d7da8, 0xf837889a, 0x97e32d77, 0x11ed935f, 0x16681281,
+        0x0e358829, 0xc7e61fd6, 0x96dedfa1, 0x7858ba99, 0x57f584a5, 0x1b227263, 0x9b83c3ff, 0x1ac24696,
+        0xcdb30aeb, 0x532e3054, 0x8fd948e4, 0x6dbc3128, 0x58ebf2ef, 0x34c6ffea, 0xfe28ed61, 0xee7c3c73,
+        0x5d4a14d9, 0xe864b7e3, 0x42105d14, 0x203e13e0, 0x45eee2b6, 0xa3aaabea, 0xdb6c4f15, 0xfacb4fd0,
+        0xc742f442, 0xef6abbb5, 0x654f3b1d, 0x41cd2105, 0xd81e799e, 0x86854dc7, 0xe44b476a, 0x3d816250,
+        0xcf62a1f2, 0x5b8d2646, 0xfc8883a0, 0xc1c7b6a3, 0x7f1524c3, 0x69cb7492, 0x47848a0b, 0x5692b285,
+        0x095bbf00, 0xad19489d, 0x1462b174, 0x23820e00, 0x58428d2a, 0x0c55f5ea, 0x1dadf43e, 0x233f7061,
+        0x3372f092, 0x8d937e41, 0xd65fecf1, 0x6c223bdb, 0x7cde3759, 0xcbee7460, 0x4085f2a7, 0xce77326e,
+        0xa6078084, 0x19f8509e, 0xe8efd855, 0x61d99735, 0xa969a7aa, 0xc50c06c2, 0x5a04abfc, 0x800bcadc,
+        0x9e447a2e, 0xc3453484, 0xfdd56705, 0x0e1e9ec9, 0xdb73dbd3, 0x105588cd, 0x675fda79, 0xe3674340,
+        0xc5c43465, 0x713e38d8, 0x3d28f89e, 0xf16dff20, 0x153e21e7, 0x8fb03d4a, 0xe6e39f2b, 0xdb83adf7
+    );
+
+    /**
+     * S-Box 2
+     *
+     * @access private
+     * @var    array
+     */
+    var $sbox2 = array(
+        0xe93d5a68, 0x948140f7, 0xf64c261c, 0x94692934, 0x411520f7, 0x7602d4f7, 0xbcf46b2e, 0xd4a20068,
+        0xd4082471, 0x3320f46a, 0x43b7d4b7, 0x500061af, 0x1e39f62e, 0x97244546, 0x14214f74, 0xbf8b8840,
+        0x4d95fc1d, 0x96b591af, 0x70f4ddd3, 0x66a02f45, 0xbfbc09ec, 0x03bd9785, 0x7fac6dd0, 0x31cb8504,
+        0x96eb27b3, 0x55fd3941, 0xda2547e6, 0xabca0a9a, 0x28507825, 0x530429f4, 0x0a2c86da, 0xe9b66dfb,
+        0x68dc1462, 0xd7486900, 0x680ec0a4, 0x27a18dee, 0x4f3ffea2, 0xe887ad8c, 0xb58ce006, 0x7af4d6b6,
+        0xaace1e7c, 0xd3375fec, 0xce78a399, 0x406b2a42, 0x20fe9e35, 0xd9f385b9, 0xee39d7ab, 0x3b124e8b,
+        0x1dc9faf7, 0x4b6d1856, 0x26a36631, 0xeae397b2, 0x3a6efa74, 0xdd5b4332, 0x6841e7f7, 0xca7820fb,
+        0xfb0af54e, 0xd8feb397, 0x454056ac, 0xba489527, 0x55533a3a, 0x20838d87, 0xfe6ba9b7, 0xd096954b,
+        0x55a867bc, 0xa1159a58, 0xcca92963, 0x99e1db33, 0xa62a4a56, 0x3f3125f9, 0x5ef47e1c, 0x9029317c,
+        0xfdf8e802, 0x04272f70, 0x80bb155c, 0x05282ce3, 0x95c11548, 0xe4c66d22, 0x48c1133f, 0xc70f86dc,
+        0x07f9c9ee, 0x41041f0f, 0x404779a4, 0x5d886e17, 0x325f51eb, 0xd59bc0d1, 0xf2bcc18f, 0x41113564,
+        0x257b7834, 0x602a9c60, 0xdff8e8a3, 0x1f636c1b, 0x0e12b4c2, 0x02e1329e, 0xaf664fd1, 0xcad18115,
+        0x6b2395e0, 0x333e92e1, 0x3b240b62, 0xeebeb922, 0x85b2a20e, 0xe6ba0d99, 0xde720c8c, 0x2da2f728,
+        0xd0127845, 0x95b794fd, 0x647d0862, 0xe7ccf5f0, 0x5449a36f, 0x877d48fa, 0xc39dfd27, 0xf33e8d1e,
+        0x0a476341, 0x992eff74, 0x3a6f6eab, 0xf4f8fd37, 0xa812dc60, 0xa1ebddf8, 0x991be14c, 0xdb6e6b0d,
+        0xc67b5510, 0x6d672c37, 0x2765d43b, 0xdcd0e804, 0xf1290dc7, 0xcc00ffa3, 0xb5390f92, 0x690fed0b,
+        0x667b9ffb, 0xcedb7d9c, 0xa091cf0b, 0xd9155ea3, 0xbb132f88, 0x515bad24, 0x7b9479bf, 0x763bd6eb,
+        0x37392eb3, 0xcc115979, 0x8026e297, 0xf42e312d, 0x6842ada7, 0xc66a2b3b, 0x12754ccc, 0x782ef11c,
+        0x6a124237, 0xb79251e7, 0x06a1bbe6, 0x4bfb6350, 0x1a6b1018, 0x11caedfa, 0x3d25bdd8, 0xe2e1c3c9,
+        0x44421659, 0x0a121386, 0xd90cec6e, 0xd5abea2a, 0x64af674e, 0xda86a85f, 0xbebfe988, 0x64e4c3fe,
+        0x9dbc8057, 0xf0f7c086, 0x60787bf8, 0x6003604d, 0xd1fd8346, 0xf6381fb0, 0x7745ae04, 0xd736fccc,
+        0x83426b33, 0xf01eab71, 0xb0804187, 0x3c005e5f, 0x77a057be, 0xbde8ae24, 0x55464299, 0xbf582e61,
+        0x4e58f48f, 0xf2ddfda2, 0xf474ef38, 0x8789bdc2, 0x5366f9c3, 0xc8b38e74, 0xb475f255, 0x46fcd9b9,
+        0x7aeb2661, 0x8b1ddf84, 0x846a0e79, 0x915f95e2, 0x466e598e, 0x20b45770, 0x8cd55591, 0xc902de4c,
+        0xb90bace1, 0xbb8205d0, 0x11a86248, 0x7574a99e, 0xb77f19b6, 0xe0a9dc09, 0x662d09a1, 0xc4324633,
+        0xe85a1f02, 0x09f0be8c, 0x4a99a025, 0x1d6efe10, 0x1ab93d1d, 0x0ba5a4df, 0xa186f20f, 0x2868f169,
+        0xdcb7da83, 0x573906fe, 0xa1e2ce9b, 0x4fcd7f52, 0x50115e01, 0xa70683fa, 0xa002b5c4, 0x0de6d027,
+        0x9af88c27, 0x773f8641, 0xc3604c06, 0x61a806b5, 0xf0177a28, 0xc0f586e0, 0x006058aa, 0x30dc7d62,
+        0x11e69ed7, 0x2338ea63, 0x53c2dd94, 0xc2c21634, 0xbbcbee56, 0x90bcb6de, 0xebfc7da1, 0xce591d76,
+        0x6f05e409, 0x4b7c0188, 0x39720a3d, 0x7c927c24, 0x86e3725f, 0x724d9db9, 0x1ac15bb4, 0xd39eb8fc,
+        0xed545578, 0x08fca5b5, 0xd83d7cd3, 0x4dad0fc4, 0x1e50ef5e, 0xb161e6f8, 0xa28514d9, 0x6c51133c,
+        0x6fd5c7e7, 0x56e14ec4, 0x362abfce, 0xddc6c837, 0xd79a3234, 0x92638212, 0x670efa8e, 0x406000e0
+    );
+
+    /**
+     * S-Box 3
+     *
+     * @access private
+     * @var    array
+     */
+    var $sbox3 = array(
+        0x3a39ce37, 0xd3faf5cf, 0xabc27737, 0x5ac52d1b, 0x5cb0679e, 0x4fa33742, 0xd3822740, 0x99bc9bbe,
+        0xd5118e9d, 0xbf0f7315, 0xd62d1c7e, 0xc700c47b, 0xb78c1b6b, 0x21a19045, 0xb26eb1be, 0x6a366eb4,
+        0x5748ab2f, 0xbc946e79, 0xc6a376d2, 0x6549c2c8, 0x530ff8ee, 0x468dde7d, 0xd5730a1d, 0x4cd04dc6,
+        0x2939bbdb, 0xa9ba4650, 0xac9526e8, 0xbe5ee304, 0xa1fad5f0, 0x6a2d519a, 0x63ef8ce2, 0x9a86ee22,
+        0xc089c2b8, 0x43242ef6, 0xa51e03aa, 0x9cf2d0a4, 0x83c061ba, 0x9be96a4d, 0x8fe51550, 0xba645bd6,
+        0x2826a2f9, 0xa73a3ae1, 0x4ba99586, 0xef5562e9, 0xc72fefd3, 0xf752f7da, 0x3f046f69, 0x77fa0a59,
+        0x80e4a915, 0x87b08601, 0x9b09e6ad, 0x3b3ee593, 0xe990fd5a, 0x9e34d797, 0x2cf0b7d9, 0x022b8b51,
+        0x96d5ac3a, 0x017da67d, 0xd1cf3ed6, 0x7c7d2d28, 0x1f9f25cf, 0xadf2b89b, 0x5ad6b472, 0x5a88f54c,
+        0xe029ac71, 0xe019a5e6, 0x47b0acfd, 0xed93fa9b, 0xe8d3c48d, 0x283b57cc, 0xf8d56629, 0x79132e28,
+        0x785f0191, 0xed756055, 0xf7960e44, 0xe3d35e8c, 0x15056dd4, 0x88f46dba, 0x03a16125, 0x0564f0bd,
+        0xc3eb9e15, 0x3c9057a2, 0x97271aec, 0xa93a072a, 0x1b3f6d9b, 0x1e6321f5, 0xf59c66fb, 0x26dcf319,
+        0x7533d928, 0xb155fdf5, 0x03563482, 0x8aba3cbb, 0x28517711, 0xc20ad9f8, 0xabcc5167, 0xccad925f,
+        0x4de81751, 0x3830dc8e, 0x379d5862, 0x9320f991, 0xea7a90c2, 0xfb3e7bce, 0x5121ce64, 0x774fbe32,
+        0xa8b6e37e, 0xc3293d46, 0x48de5369, 0x6413e680, 0xa2ae0810, 0xdd6db224, 0x69852dfd, 0x09072166,
+        0xb39a460a, 0x6445c0dd, 0x586cdecf, 0x1c20c8ae, 0x5bbef7dd, 0x1b588d40, 0xccd2017f, 0x6bb4e3bb,
+        0xdda26a7e, 0x3a59ff45, 0x3e350a44, 0xbcb4cdd5, 0x72eacea8, 0xfa6484bb, 0x8d6612ae, 0xbf3c6f47,
+        0xd29be463, 0x542f5d9e, 0xaec2771b, 0xf64e6370, 0x740e0d8d, 0xe75b1357, 0xf8721671, 0xaf537d5d,
+        0x4040cb08, 0x4eb4e2cc, 0x34d2466a, 0x0115af84, 0xe1b00428, 0x95983a1d, 0x06b89fb4, 0xce6ea048,
+        0x6f3f3b82, 0x3520ab82, 0x011a1d4b, 0x277227f8, 0x611560b1, 0xe7933fdc, 0xbb3a792b, 0x344525bd,
+        0xa08839e1, 0x51ce794b, 0x2f32c9b7, 0xa01fbac9, 0xe01cc87e, 0xbcc7d1f6, 0xcf0111c3, 0xa1e8aac7,
+        0x1a908749, 0xd44fbd9a, 0xd0dadecb, 0xd50ada38, 0x0339c32a, 0xc6913667, 0x8df9317c, 0xe0b12b4f,
+        0xf79e59b7, 0x43f5bb3a, 0xf2d519ff, 0x27d9459c, 0xbf97222c, 0x15e6fc2a, 0x0f91fc71, 0x9b941525,
+        0xfae59361, 0xceb69ceb, 0xc2a86459, 0x12baa8d1, 0xb6c1075e, 0xe3056a0c, 0x10d25065, 0xcb03a442,
+        0xe0ec6e0e, 0x1698db3b, 0x4c98a0be, 0x3278e964, 0x9f1f9532, 0xe0d392df, 0xd3a0342b, 0x8971f21e,
+        0x1b0a7441, 0x4ba3348c, 0xc5be7120, 0xc37632d8, 0xdf359f8d, 0x9b992f2e, 0xe60b6f47, 0x0fe3f11d,
+        0xe54cda54, 0x1edad891, 0xce6279cf, 0xcd3e7e6f, 0x1618b166, 0xfd2c1d05, 0x848fd2c5, 0xf6fb2299,
+        0xf523f357, 0xa6327623, 0x93a83531, 0x56cccd02, 0xacf08162, 0x5a75ebb5, 0x6e163697, 0x88d273cc,
+        0xde966292, 0x81b949d0, 0x4c50901b, 0x71c65614, 0xe6c6c7bd, 0x327a140a, 0x45e1d006, 0xc3f27b9a,
+        0xc9aa53fd, 0x62a80f00, 0xbb25bfe2, 0x35bdd2f6, 0x71126905, 0xb2040222, 0xb6cbcf7c, 0xcd769c2b,
+        0x53113ec0, 0x1640e3d3, 0x38abbd60, 0x2547adf0, 0xba38209c, 0xf746ce76, 0x77afa1c5, 0x20756060,
+        0x85cbfe4e, 0x8ae88dd8, 0x7aaaf9b0, 0x4cf9aa7e, 0x1948c25c, 0x02fb8a8c, 0x01c36ae4, 0xd6ebe1f9,
+        0x90d4f869, 0xa65cdea0, 0x3f09252d, 0xc208e69f, 0xb74e6132, 0xce77e25b, 0x578fdfe3, 0x3ac372e6
+    );
+
+    /**
+     * P-Array consists of 18 32-bit subkeys
+     *
+     * @var array
+     * @access private
+     */
+    var $parray = array(
+        0x243f6a88, 0x85a308d3, 0x13198a2e, 0x03707344, 0xa4093822, 0x299f31d0,
+        0x082efa98, 0xec4e6c89, 0x452821e6, 0x38d01377, 0xbe5466cf, 0x34e90c6c,
+        0xc0ac29b7, 0xc97c50dd, 0x3f84d5b5, 0xb5470917, 0x9216d5d9, 0x8979fb1b
+    );
+
+    /**
+     * The BCTX-working Array
+     *
+     * Holds the expanded key [p] and the key-depended s-boxes [sb]
+     *
+     * @var array
+     * @access private
+     */
+    var $bctx;
+
+    /**
+     * Holds the last used key
+     *
+     * @var array
+     * @access private
+     */
+    var $kl;
+
+    /**
+     * The Key Length (in bytes)
+     *
+     * @see Crypt_Base::setKeyLength()
+     * @var int
+     * @access private
+     * @internal The max value is 256 / 8 = 32, the min value is 128 / 8 = 16.  Exists in conjunction with $Nk
+     *    because the encryption / decryption / key schedule creation requires this number and not $key_length.  We could
+     *    derive this from $key_length or vice versa, but that'd mean we'd have to do multiple shift operations, so in lieu
+     *    of that, we'll just precompute it once.
+     */
+    var $key_length = 16;
+
+    /**
+     * Sets the key length.
+     *
+     * Key lengths can be between 32 and 448 bits.
+     *
+     * @access public
+     * @param int $length
+     */
+    function setKeyLength($length)
+    {
+        if ($length < 32) {
+            $this->key_length = 4;
+        } elseif ($length > 448) {
+            $this->key_length = 56;
+        } else {
+            $this->key_length = $length >> 3;
+        }
+
+        parent::setKeyLength($length);
+    }
+
+    /**
+     * Test for engine validity
+     *
+     * This is mainly just a wrapper to set things up for Crypt_Base::isValidEngine()
+     *
+     * @see Crypt_Base::isValidEngine()
+     * @param int $engine
+     * @access public
+     * @return bool
+     */
+    function isValidEngine($engine)
+    {
+        if ($engine == CRYPT_ENGINE_OPENSSL) {
+            if (version_compare(PHP_VERSION, '5.3.7') < 0 && $this->key_length != 16) {
+                return false;
+            }
+            if ($this->key_length < 16) {
+                return false;
+            }
+            $this->cipher_name_openssl_ecb = 'bf-ecb';
+            $this->cipher_name_openssl = 'bf-' . $this->_openssl_translate_mode();
+        }
+
+        return parent::isValidEngine($engine);
+    }
+
+    /**
+     * Setup the key (expansion)
+     *
+     * @see Crypt_Base::_setupKey()
+     * @access private
+     */
+    function _setupKey()
+    {
+        if (isset($this->kl['key']) && $this->key === $this->kl['key']) {
+            // already expanded
+            return;
+        }
+        $this->kl = array('key' => $this->key);
+
+        /* key-expanding p[] and S-Box building sb[] */
+        $this->bctx = array(
+            'p'  => array(),
+            'sb' => array(
+                $this->sbox0,
+                $this->sbox1,
+                $this->sbox2,
+                $this->sbox3
+            )
+        );
+
+        // unpack binary string in unsigned chars
+        $key  = array_values(unpack('C*', $this->key));
+        $keyl = count($key);
+        for ($j = 0, $i = 0; $i < 18; ++$i) {
+            // xor P1 with the first 32-bits of the key, xor P2 with the second 32-bits ...
+            for ($data = 0, $k = 0; $k < 4; ++$k) {
+                $data = ($data << 8) | $key[$j];
+                if (++$j >= $keyl) {
+                    $j = 0;
+                }
+            }
+            $this->bctx['p'][] = $this->parray[$i] ^ $data;
+        }
+
+        // encrypt the zero-string, replace P1 and P2 with the encrypted data,
+        // encrypt P3 and P4 with the new P1 and P2, do it with all P-array and subkeys
+        $data = "\0\0\0\0\0\0\0\0";
+        for ($i = 0; $i < 18; $i += 2) {
+            list($l, $r) = array_values(unpack('N*', $data = $this->_encryptBlock($data)));
+            $this->bctx['p'][$i    ] = $l;
+            $this->bctx['p'][$i + 1] = $r;
+        }
+        for ($i = 0; $i < 4; ++$i) {
+            for ($j = 0; $j < 256; $j += 2) {
+                list($l, $r) = array_values(unpack('N*', $data = $this->_encryptBlock($data)));
+                $this->bctx['sb'][$i][$j    ] = $l;
+                $this->bctx['sb'][$i][$j + 1] = $r;
+            }
+        }
+    }
+
+    /**
+     * Encrypts a block
+     *
+     * @access private
+     * @param string $in
+     * @return string
+     */
+    function _encryptBlock($in)
+    {
+        $p = $this->bctx["p"];
+        // extract($this->bctx["sb"], EXTR_PREFIX_ALL, "sb"); // slower
+        $sb_0 = $this->bctx["sb"][0];
+        $sb_1 = $this->bctx["sb"][1];
+        $sb_2 = $this->bctx["sb"][2];
+        $sb_3 = $this->bctx["sb"][3];
+
+        $in = unpack("N*", $in);
+        $l = $in[1];
+        $r = $in[2];
+
+        for ($i = 0; $i < 16; $i+= 2) {
+            $l^= $p[$i];
+            $r^= $this->safe_intval(($this->safe_intval($sb_0[$l >> 24 & 0xff]  + $sb_1[$l >> 16 & 0xff]) ^
+                  $sb_2[$l >>  8 & 0xff]) +
+                  $sb_3[$l       & 0xff]);
+
+            $r^= $p[$i + 1];
+            $l^= $this->safe_intval(($this->safe_intval($sb_0[$r >> 24 & 0xff]  + $sb_1[$r >> 16 & 0xff]) ^
+                  $sb_2[$r >>  8 & 0xff]) +
+                  $sb_3[$r       & 0xff]);
+        }
+        return pack("N*", $r ^ $p[17], $l ^ $p[16]);
+    }
+
+    /**
+     * Decrypts a block
+     *
+     * @access private
+     * @param string $in
+     * @return string
+     */
+    function _decryptBlock($in)
+    {
+        $p = $this->bctx["p"];
+        $sb_0 = $this->bctx["sb"][0];
+        $sb_1 = $this->bctx["sb"][1];
+        $sb_2 = $this->bctx["sb"][2];
+        $sb_3 = $this->bctx["sb"][3];
+
+        $in = unpack("N*", $in);
+        $l = $in[1];
+        $r = $in[2];
+
+        for ($i = 17; $i > 2; $i-= 2) {
+            $l^= $p[$i];
+            $r^= $this->safe_intval(($this->safe_intval($sb_0[$l >> 24 & 0xff] + $sb_1[$l >> 16 & 0xff]) ^
+                  $sb_2[$l >>  8 & 0xff]) +
+                  $sb_3[$l       & 0xff]);
+
+            $r^= $p[$i - 1];
+            $l^= $this->safe_intval(($this->safe_intval($sb_0[$r >> 24 & 0xff] + $sb_1[$r >> 16 & 0xff]) ^
+                  $sb_2[$r >>  8 & 0xff]) +
+                  $sb_3[$r       & 0xff]);
+        }
+        return pack("N*", $r ^ $p[0], $l ^ $p[1]);
+    }
+
+    /**
+     * Setup the performance-optimized function for de/encrypt()
+     *
+     * @see Crypt_Base::_setupInlineCrypt()
+     * @access private
+     */
+    function _setupInlineCrypt()
+    {
+        $lambda_functions =& Crypt_Blowfish::_getLambdaFunctions();
+
+        // We create max. 10 hi-optimized code for memory reason. Means: For each $key one ultra fast inline-crypt function.
+        // (Currently, for Crypt_Blowfish, one generated $lambda_function cost on php5.5@32bit ~100kb unfreeable mem and ~180kb on php5.5@64bit)
+        // After that, we'll still create very fast optimized code but not the hi-ultimative code, for each $mode one.
+        $gen_hi_opt_code = (bool)(count($lambda_functions) < 10);
+
+        // Generation of a unique hash for our generated code
+        $code_hash = "Crypt_Blowfish, {$this->mode}";
+        if ($gen_hi_opt_code) {
+            $code_hash = str_pad($code_hash, 32) . $this->_hashInlineCryptFunction($this->key);
+        }
+
+        $safeint = $this->safe_intval_inline();
+
+        if (!isset($lambda_functions[$code_hash])) {
+            switch (true) {
+                case $gen_hi_opt_code:
+                    $p = $this->bctx['p'];
+                    $init_crypt = '
+                        static $sb_0, $sb_1, $sb_2, $sb_3;
+                        if (!$sb_0) {
+                            $sb_0 = $self->bctx["sb"][0];
+                            $sb_1 = $self->bctx["sb"][1];
+                            $sb_2 = $self->bctx["sb"][2];
+                            $sb_3 = $self->bctx["sb"][3];
+                        }
+                    ';
+                    break;
+                default:
+                    $p   = array();
+                    for ($i = 0; $i < 18; ++$i) {
+                        $p[] = '$p_' . $i;
+                    }
+                    $init_crypt = '
+                        list($sb_0, $sb_1, $sb_2, $sb_3) = $self->bctx["sb"];
+                        list(' . implode(',', $p) . ') = $self->bctx["p"];
+
+                    ';
+            }
+
+            // Generating encrypt code:
+            $encrypt_block = '
+                $in = unpack("N*", $in);
+                $l = $in[1];
+                $r = $in[2];
+            ';
+            for ($i = 0; $i < 16; $i+= 2) {
+                $encrypt_block.= '
+                    $l^= ' . $p[$i] . ';
+                    $r^= ' . sprintf($safeint, '(' . sprintf($safeint, '$sb_0[$l >> 24 & 0xff] + $sb_1[$l >> 16 & 0xff]') . ' ^
+                          $sb_2[$l >>  8 & 0xff]) +
+                          $sb_3[$l       & 0xff]') . ';
+
+                    $r^= ' . $p[$i + 1] . ';
+                    $l^= ' . sprintf($safeint, '(' . sprintf($safeint, '$sb_0[$r >> 24 & 0xff] + $sb_1[$r >> 16 & 0xff]') . '  ^
+                          $sb_2[$r >>  8 & 0xff]) +
+                          $sb_3[$r       & 0xff]') . ';
+                ';
+            }
+            $encrypt_block.= '
+                $in = pack("N*",
+                    $r ^ ' . $p[17] . ',
+                    $l ^ ' . $p[16] . '
+                );
+            ';
+
+            // Generating decrypt code:
+            $decrypt_block = '
+                $in = unpack("N*", $in);
+                $l = $in[1];
+                $r = $in[2];
+            ';
+
+            for ($i = 17; $i > 2; $i-= 2) {
+                $decrypt_block.= '
+                    $l^= ' . $p[$i] . ';
+                    $r^= ' . sprintf($safeint, '(' . sprintf($safeint, '$sb_0[$l >> 24 & 0xff] + $sb_1[$l >> 16 & 0xff]') . ' ^
+                          $sb_2[$l >>  8 & 0xff]) +
+                          $sb_3[$l       & 0xff]') . ';
+
+                    $r^= ' . $p[$i - 1] . ';
+                    $l^= ' . sprintf($safeint, '(' . sprintf($safeint, '$sb_0[$r >> 24 & 0xff] + $sb_1[$r >> 16 & 0xff]') . ' ^
+                          $sb_2[$r >>  8 & 0xff]) +
+                          $sb_3[$r       & 0xff]') . ';
+                ';
+            }
+
+            $decrypt_block.= '
+                $in = pack("N*",
+                    $r ^ ' . $p[0] . ',
+                    $l ^ ' . $p[1] . '
+                );
+            ';
+
+            $lambda_functions[$code_hash] = $this->_createInlineCryptFunction(
+                array(
+                   'init_crypt'    => $init_crypt,
+                   'init_encrypt'  => '',
+                   'init_decrypt'  => '',
+                   'encrypt_block' => $encrypt_block,
+                   'decrypt_block' => $decrypt_block
+                )
+            );
+        }
+        $this->inline_crypt = $lambda_functions[$code_hash];
+    }
+}
diff --git a/lib/php/phpseclib/Crypt/DES.php b/lib/php/phpseclib/Crypt/DES.php
new file mode 100644
index 00000000..3cec2498
--- /dev/null
+++ b/lib/php/phpseclib/Crypt/DES.php
@@ -0,0 +1,1516 @@
+<?php
+
+/**
+ * Pure-PHP implementation of DES.
+ *
+ * Uses mcrypt, if available, and an internal implementation, otherwise.
+ *
+ * PHP versions 4 and 5
+ *
+ * Useful resources are as follows:
+ *
+ *  - {@link http://en.wikipedia.org/wiki/DES_supplementary_material Wikipedia: DES supplementary material}
+ *  - {@link http://www.itl.nist.gov/fipspubs/fip46-2.htm FIPS 46-2 - (DES), Data Encryption Standard}
+ *  - {@link http://www.cs.eku.edu/faculty/styer/460/Encrypt/JS-DES.html JavaScript DES Example}
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ *    include 'Crypt/DES.php';
+ *
+ *    $des = new Crypt_DES();
+ *
+ *    $des->setKey('abcdefgh');
+ *
+ *    $size = 10 * 1024;
+ *    $plaintext = '';
+ *    for ($i = 0; $i < $size; $i++) {
+ *        $plaintext.= 'a';
+ *    }
+ *
+ *    echo $des->decrypt($des->encrypt($plaintext));
+ * ?>
+ * </code>
+ *
+ * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @category  Crypt
+ * @package   Crypt_DES
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2007 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+/**
+ * Include Crypt_Base
+ *
+ * Base cipher class
+ */
+if (!class_exists('Crypt_Base')) {
+    include_once 'Base.php';
+}
+
+/**#@+
+ * @access private
+ * @see self::_setupKey()
+ * @see self::_processBlock()
+ */
+/**
+ * Contains $keys[CRYPT_DES_ENCRYPT]
+ */
+define('CRYPT_DES_ENCRYPT', 0);
+/**
+ * Contains $keys[CRYPT_DES_DECRYPT]
+ */
+define('CRYPT_DES_DECRYPT', 1);
+/**#@-*/
+
+/**#@+
+ * @access public
+ * @see self::encrypt()
+ * @see self::decrypt()
+ */
+/**
+ * Encrypt / decrypt using the Counter mode.
+ *
+ * Set to -1 since that's what Crypt/Random.php uses to index the CTR mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Counter_.28CTR.29
+ */
+define('CRYPT_DES_MODE_CTR', CRYPT_MODE_CTR);
+/**
+ * Encrypt / decrypt using the Electronic Code Book mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Electronic_codebook_.28ECB.29
+ */
+define('CRYPT_DES_MODE_ECB', CRYPT_MODE_ECB);
+/**
+ * Encrypt / decrypt using the Code Book Chaining mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher-block_chaining_.28CBC.29
+ */
+define('CRYPT_DES_MODE_CBC', CRYPT_MODE_CBC);
+/**
+ * Encrypt / decrypt using the Cipher Feedback mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher_feedback_.28CFB.29
+ */
+define('CRYPT_DES_MODE_CFB', CRYPT_MODE_CFB);
+/**
+ * Encrypt / decrypt using the Cipher Feedback mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Output_feedback_.28OFB.29
+ */
+define('CRYPT_DES_MODE_OFB', CRYPT_MODE_OFB);
+/**#@-*/
+
+/**
+ * Pure-PHP implementation of DES.
+ *
+ * @package Crypt_DES
+ * @author  Jim Wigginton <terrafrost@php.net>
+ * @access  public
+ */
+class Crypt_DES extends Crypt_Base
+{
+    /**
+     * Block Length of the cipher
+     *
+     * @see Crypt_Base::block_size
+     * @var int
+     * @access private
+     */
+    var $block_size = 8;
+
+    /**
+     * Key Length (in bytes)
+     *
+     * @see Crypt_Base::setKeyLength()
+     * @var int
+     * @access private
+     */
+    var $key_length = 8;
+
+    /**
+     * The namespace used by the cipher for its constants.
+     *
+     * @see Crypt_Base::const_namespace
+     * @var string
+     * @access private
+     */
+    var $const_namespace = 'DES';
+
+    /**
+     * The mcrypt specific name of the cipher
+     *
+     * @see Crypt_Base::cipher_name_mcrypt
+     * @var string
+     * @access private
+     */
+    var $cipher_name_mcrypt = 'des';
+
+    /**
+     * The OpenSSL names of the cipher / modes
+     *
+     * @see Crypt_Base::openssl_mode_names
+     * @var array
+     * @access private
+     */
+    var $openssl_mode_names = array(
+        CRYPT_MODE_ECB => 'des-ecb',
+        CRYPT_MODE_CBC => 'des-cbc',
+        CRYPT_MODE_CFB => 'des-cfb',
+        CRYPT_MODE_OFB => 'des-ofb'
+        // CRYPT_MODE_CTR is undefined for DES
+    );
+
+    /**
+     * Optimizing value while CFB-encrypting
+     *
+     * @see Crypt_Base::cfb_init_len
+     * @var int
+     * @access private
+     */
+    var $cfb_init_len = 500;
+
+    /**
+     * Switch for DES/3DES encryption
+     *
+     * Used only if $engine == CRYPT_DES_MODE_INTERNAL
+     *
+     * @see self::_setupKey()
+     * @see self::_processBlock()
+     * @var int
+     * @access private
+     */
+    var $des_rounds = 1;
+
+    /**
+     * max possible size of $key
+     *
+     * @see self::setKey()
+     * @var string
+     * @access private
+     */
+    var $key_length_max = 8;
+
+    /**
+     * The Key Schedule
+     *
+     * @see self::_setupKey()
+     * @var array
+     * @access private
+     */
+    var $keys;
+
+    /**
+     * Shuffle table.
+     *
+     * For each byte value index, the entry holds an 8-byte string
+     * with each byte containing all bits in the same state as the
+     * corresponding bit in the index value.
+     *
+     * @see self::_processBlock()
+     * @see self::_setupKey()
+     * @var array
+     * @access private
+     */
+    var $shuffle = array(
+        "\x00\x00\x00\x00\x00\x00\x00\x00", "\x00\x00\x00\x00\x00\x00\x00\xFF",
+        "\x00\x00\x00\x00\x00\x00\xFF\x00", "\x00\x00\x00\x00\x00\x00\xFF\xFF",
+        "\x00\x00\x00\x00\x00\xFF\x00\x00", "\x00\x00\x00\x00\x00\xFF\x00\xFF",
+        "\x00\x00\x00\x00\x00\xFF\xFF\x00", "\x00\x00\x00\x00\x00\xFF\xFF\xFF",
+        "\x00\x00\x00\x00\xFF\x00\x00\x00", "\x00\x00\x00\x00\xFF\x00\x00\xFF",
+        "\x00\x00\x00\x00\xFF\x00\xFF\x00", "\x00\x00\x00\x00\xFF\x00\xFF\xFF",
+        "\x00\x00\x00\x00\xFF\xFF\x00\x00", "\x00\x00\x00\x00\xFF\xFF\x00\xFF",
+        "\x00\x00\x00\x00\xFF\xFF\xFF\x00", "\x00\x00\x00\x00\xFF\xFF\xFF\xFF",
+        "\x00\x00\x00\xFF\x00\x00\x00\x00", "\x00\x00\x00\xFF\x00\x00\x00\xFF",
+        "\x00\x00\x00\xFF\x00\x00\xFF\x00", "\x00\x00\x00\xFF\x00\x00\xFF\xFF",
+        "\x00\x00\x00\xFF\x00\xFF\x00\x00", "\x00\x00\x00\xFF\x00\xFF\x00\xFF",
+        "\x00\x00\x00\xFF\x00\xFF\xFF\x00", "\x00\x00\x00\xFF\x00\xFF\xFF\xFF",
+        "\x00\x00\x00\xFF\xFF\x00\x00\x00", "\x00\x00\x00\xFF\xFF\x00\x00\xFF",
+        "\x00\x00\x00\xFF\xFF\x00\xFF\x00", "\x00\x00\x00\xFF\xFF\x00\xFF\xFF",
+        "\x00\x00\x00\xFF\xFF\xFF\x00\x00", "\x00\x00\x00\xFF\xFF\xFF\x00\xFF",
+        "\x00\x00\x00\xFF\xFF\xFF\xFF\x00", "\x00\x00\x00\xFF\xFF\xFF\xFF\xFF",
+        "\x00\x00\xFF\x00\x00\x00\x00\x00", "\x00\x00\xFF\x00\x00\x00\x00\xFF",
+        "\x00\x00\xFF\x00\x00\x00\xFF\x00", "\x00\x00\xFF\x00\x00\x00\xFF\xFF",
+        "\x00\x00\xFF\x00\x00\xFF\x00\x00", "\x00\x00\xFF\x00\x00\xFF\x00\xFF",
+        "\x00\x00\xFF\x00\x00\xFF\xFF\x00", "\x00\x00\xFF\x00\x00\xFF\xFF\xFF",
+        "\x00\x00\xFF\x00\xFF\x00\x00\x00", "\x00\x00\xFF\x00\xFF\x00\x00\xFF",
+        "\x00\x00\xFF\x00\xFF\x00\xFF\x00", "\x00\x00\xFF\x00\xFF\x00\xFF\xFF",
+        "\x00\x00\xFF\x00\xFF\xFF\x00\x00", "\x00\x00\xFF\x00\xFF\xFF\x00\xFF",
+        "\x00\x00\xFF\x00\xFF\xFF\xFF\x00", "\x00\x00\xFF\x00\xFF\xFF\xFF\xFF",
+        "\x00\x00\xFF\xFF\x00\x00\x00\x00", "\x00\x00\xFF\xFF\x00\x00\x00\xFF",
+        "\x00\x00\xFF\xFF\x00\x00\xFF\x00", "\x00\x00\xFF\xFF\x00\x00\xFF\xFF",
+        "\x00\x00\xFF\xFF\x00\xFF\x00\x00", "\x00\x00\xFF\xFF\x00\xFF\x00\xFF",
+        "\x00\x00\xFF\xFF\x00\xFF\xFF\x00", "\x00\x00\xFF\xFF\x00\xFF\xFF\xFF",
+        "\x00\x00\xFF\xFF\xFF\x00\x00\x00", "\x00\x00\xFF\xFF\xFF\x00\x00\xFF",
+        "\x00\x00\xFF\xFF\xFF\x00\xFF\x00", "\x00\x00\xFF\xFF\xFF\x00\xFF\xFF",
+        "\x00\x00\xFF\xFF\xFF\xFF\x00\x00", "\x00\x00\xFF\xFF\xFF\xFF\x00\xFF",
+        "\x00\x00\xFF\xFF\xFF\xFF\xFF\x00", "\x00\x00\xFF\xFF\xFF\xFF\xFF\xFF",
+        "\x00\xFF\x00\x00\x00\x00\x00\x00", "\x00\xFF\x00\x00\x00\x00\x00\xFF",
+        "\x00\xFF\x00\x00\x00\x00\xFF\x00", "\x00\xFF\x00\x00\x00\x00\xFF\xFF",
+        "\x00\xFF\x00\x00\x00\xFF\x00\x00", "\x00\xFF\x00\x00\x00\xFF\x00\xFF",
+        "\x00\xFF\x00\x00\x00\xFF\xFF\x00", "\x00\xFF\x00\x00\x00\xFF\xFF\xFF",
+        "\x00\xFF\x00\x00\xFF\x00\x00\x00", "\x00\xFF\x00\x00\xFF\x00\x00\xFF",
+        "\x00\xFF\x00\x00\xFF\x00\xFF\x00", "\x00\xFF\x00\x00\xFF\x00\xFF\xFF",
+        "\x00\xFF\x00\x00\xFF\xFF\x00\x00", "\x00\xFF\x00\x00\xFF\xFF\x00\xFF",
+        "\x00\xFF\x00\x00\xFF\xFF\xFF\x00", "\x00\xFF\x00\x00\xFF\xFF\xFF\xFF",
+        "\x00\xFF\x00\xFF\x00\x00\x00\x00", "\x00\xFF\x00\xFF\x00\x00\x00\xFF",
+        "\x00\xFF\x00\xFF\x00\x00\xFF\x00", "\x00\xFF\x00\xFF\x00\x00\xFF\xFF",
+        "\x00\xFF\x00\xFF\x00\xFF\x00\x00", "\x00\xFF\x00\xFF\x00\xFF\x00\xFF",
+        "\x00\xFF\x00\xFF\x00\xFF\xFF\x00", "\x00\xFF\x00\xFF\x00\xFF\xFF\xFF",
+        "\x00\xFF\x00\xFF\xFF\x00\x00\x00", "\x00\xFF\x00\xFF\xFF\x00\x00\xFF",
+        "\x00\xFF\x00\xFF\xFF\x00\xFF\x00", "\x00\xFF\x00\xFF\xFF\x00\xFF\xFF",
+        "\x00\xFF\x00\xFF\xFF\xFF\x00\x00", "\x00\xFF\x00\xFF\xFF\xFF\x00\xFF",
+        "\x00\xFF\x00\xFF\xFF\xFF\xFF\x00", "\x00\xFF\x00\xFF\xFF\xFF\xFF\xFF",
+        "\x00\xFF\xFF\x00\x00\x00\x00\x00", "\x00\xFF\xFF\x00\x00\x00\x00\xFF",
+        "\x00\xFF\xFF\x00\x00\x00\xFF\x00", "\x00\xFF\xFF\x00\x00\x00\xFF\xFF",
+        "\x00\xFF\xFF\x00\x00\xFF\x00\x00", "\x00\xFF\xFF\x00\x00\xFF\x00\xFF",
+        "\x00\xFF\xFF\x00\x00\xFF\xFF\x00", "\x00\xFF\xFF\x00\x00\xFF\xFF\xFF",
+        "\x00\xFF\xFF\x00\xFF\x00\x00\x00", "\x00\xFF\xFF\x00\xFF\x00\x00\xFF",
+        "\x00\xFF\xFF\x00\xFF\x00\xFF\x00", "\x00\xFF\xFF\x00\xFF\x00\xFF\xFF",
+        "\x00\xFF\xFF\x00\xFF\xFF\x00\x00", "\x00\xFF\xFF\x00\xFF\xFF\x00\xFF",
+        "\x00\xFF\xFF\x00\xFF\xFF\xFF\x00", "\x00\xFF\xFF\x00\xFF\xFF\xFF\xFF",
+        "\x00\xFF\xFF\xFF\x00\x00\x00\x00", "\x00\xFF\xFF\xFF\x00\x00\x00\xFF",
+        "\x00\xFF\xFF\xFF\x00\x00\xFF\x00", "\x00\xFF\xFF\xFF\x00\x00\xFF\xFF",
+        "\x00\xFF\xFF\xFF\x00\xFF\x00\x00", "\x00\xFF\xFF\xFF\x00\xFF\x00\xFF",
+        "\x00\xFF\xFF\xFF\x00\xFF\xFF\x00", "\x00\xFF\xFF\xFF\x00\xFF\xFF\xFF",
+        "\x00\xFF\xFF\xFF\xFF\x00\x00\x00", "\x00\xFF\xFF\xFF\xFF\x00\x00\xFF",
+        "\x00\xFF\xFF\xFF\xFF\x00\xFF\x00", "\x00\xFF\xFF\xFF\xFF\x00\xFF\xFF",
+        "\x00\xFF\xFF\xFF\xFF\xFF\x00\x00", "\x00\xFF\xFF\xFF\xFF\xFF\x00\xFF",
+        "\x00\xFF\xFF\xFF\xFF\xFF\xFF\x00", "\x00\xFF\xFF\xFF\xFF\xFF\xFF\xFF",
+        "\xFF\x00\x00\x00\x00\x00\x00\x00", "\xFF\x00\x00\x00\x00\x00\x00\xFF",
+        "\xFF\x00\x00\x00\x00\x00\xFF\x00", "\xFF\x00\x00\x00\x00\x00\xFF\xFF",
+        "\xFF\x00\x00\x00\x00\xFF\x00\x00", "\xFF\x00\x00\x00\x00\xFF\x00\xFF",
+        "\xFF\x00\x00\x00\x00\xFF\xFF\x00", "\xFF\x00\x00\x00\x00\xFF\xFF\xFF",
+        "\xFF\x00\x00\x00\xFF\x00\x00\x00", "\xFF\x00\x00\x00\xFF\x00\x00\xFF",
+        "\xFF\x00\x00\x00\xFF\x00\xFF\x00", "\xFF\x00\x00\x00\xFF\x00\xFF\xFF",
+        "\xFF\x00\x00\x00\xFF\xFF\x00\x00", "\xFF\x00\x00\x00\xFF\xFF\x00\xFF",
+        "\xFF\x00\x00\x00\xFF\xFF\xFF\x00", "\xFF\x00\x00\x00\xFF\xFF\xFF\xFF",
+        "\xFF\x00\x00\xFF\x00\x00\x00\x00", "\xFF\x00\x00\xFF\x00\x00\x00\xFF",
+        "\xFF\x00\x00\xFF\x00\x00\xFF\x00", "\xFF\x00\x00\xFF\x00\x00\xFF\xFF",
+        "\xFF\x00\x00\xFF\x00\xFF\x00\x00", "\xFF\x00\x00\xFF\x00\xFF\x00\xFF",
+        "\xFF\x00\x00\xFF\x00\xFF\xFF\x00", "\xFF\x00\x00\xFF\x00\xFF\xFF\xFF",
+        "\xFF\x00\x00\xFF\xFF\x00\x00\x00", "\xFF\x00\x00\xFF\xFF\x00\x00\xFF",
+        "\xFF\x00\x00\xFF\xFF\x00\xFF\x00", "\xFF\x00\x00\xFF\xFF\x00\xFF\xFF",
+        "\xFF\x00\x00\xFF\xFF\xFF\x00\x00", "\xFF\x00\x00\xFF\xFF\xFF\x00\xFF",
+        "\xFF\x00\x00\xFF\xFF\xFF\xFF\x00", "\xFF\x00\x00\xFF\xFF\xFF\xFF\xFF",
+        "\xFF\x00\xFF\x00\x00\x00\x00\x00", "\xFF\x00\xFF\x00\x00\x00\x00\xFF",
+        "\xFF\x00\xFF\x00\x00\x00\xFF\x00", "\xFF\x00\xFF\x00\x00\x00\xFF\xFF",
+        "\xFF\x00\xFF\x00\x00\xFF\x00\x00", "\xFF\x00\xFF\x00\x00\xFF\x00\xFF",
+        "\xFF\x00\xFF\x00\x00\xFF\xFF\x00", "\xFF\x00\xFF\x00\x00\xFF\xFF\xFF",
+        "\xFF\x00\xFF\x00\xFF\x00\x00\x00", "\xFF\x00\xFF\x00\xFF\x00\x00\xFF",
+        "\xFF\x00\xFF\x00\xFF\x00\xFF\x00", "\xFF\x00\xFF\x00\xFF\x00\xFF\xFF",
+        "\xFF\x00\xFF\x00\xFF\xFF\x00\x00", "\xFF\x00\xFF\x00\xFF\xFF\x00\xFF",
+        "\xFF\x00\xFF\x00\xFF\xFF\xFF\x00", "\xFF\x00\xFF\x00\xFF\xFF\xFF\xFF",
+        "\xFF\x00\xFF\xFF\x00\x00\x00\x00", "\xFF\x00\xFF\xFF\x00\x00\x00\xFF",
+        "\xFF\x00\xFF\xFF\x00\x00\xFF\x00", "\xFF\x00\xFF\xFF\x00\x00\xFF\xFF",
+        "\xFF\x00\xFF\xFF\x00\xFF\x00\x00", "\xFF\x00\xFF\xFF\x00\xFF\x00\xFF",
+        "\xFF\x00\xFF\xFF\x00\xFF\xFF\x00", "\xFF\x00\xFF\xFF\x00\xFF\xFF\xFF",
+        "\xFF\x00\xFF\xFF\xFF\x00\x00\x00", "\xFF\x00\xFF\xFF\xFF\x00\x00\xFF",
+        "\xFF\x00\xFF\xFF\xFF\x00\xFF\x00", "\xFF\x00\xFF\xFF\xFF\x00\xFF\xFF",
+        "\xFF\x00\xFF\xFF\xFF\xFF\x00\x00", "\xFF\x00\xFF\xFF\xFF\xFF\x00\xFF",
+        "\xFF\x00\xFF\xFF\xFF\xFF\xFF\x00", "\xFF\x00\xFF\xFF\xFF\xFF\xFF\xFF",
+        "\xFF\xFF\x00\x00\x00\x00\x00\x00", "\xFF\xFF\x00\x00\x00\x00\x00\xFF",
+        "\xFF\xFF\x00\x00\x00\x00\xFF\x00", "\xFF\xFF\x00\x00\x00\x00\xFF\xFF",
+        "\xFF\xFF\x00\x00\x00\xFF\x00\x00", "\xFF\xFF\x00\x00\x00\xFF\x00\xFF",
+        "\xFF\xFF\x00\x00\x00\xFF\xFF\x00", "\xFF\xFF\x00\x00\x00\xFF\xFF\xFF",
+        "\xFF\xFF\x00\x00\xFF\x00\x00\x00", "\xFF\xFF\x00\x00\xFF\x00\x00\xFF",
+        "\xFF\xFF\x00\x00\xFF\x00\xFF\x00", "\xFF\xFF\x00\x00\xFF\x00\xFF\xFF",
+        "\xFF\xFF\x00\x00\xFF\xFF\x00\x00", "\xFF\xFF\x00\x00\xFF\xFF\x00\xFF",
+        "\xFF\xFF\x00\x00\xFF\xFF\xFF\x00", "\xFF\xFF\x00\x00\xFF\xFF\xFF\xFF",
+        "\xFF\xFF\x00\xFF\x00\x00\x00\x00", "\xFF\xFF\x00\xFF\x00\x00\x00\xFF",
+        "\xFF\xFF\x00\xFF\x00\x00\xFF\x00", "\xFF\xFF\x00\xFF\x00\x00\xFF\xFF",
+        "\xFF\xFF\x00\xFF\x00\xFF\x00\x00", "\xFF\xFF\x00\xFF\x00\xFF\x00\xFF",
+        "\xFF\xFF\x00\xFF\x00\xFF\xFF\x00", "\xFF\xFF\x00\xFF\x00\xFF\xFF\xFF",
+        "\xFF\xFF\x00\xFF\xFF\x00\x00\x00", "\xFF\xFF\x00\xFF\xFF\x00\x00\xFF",
+        "\xFF\xFF\x00\xFF\xFF\x00\xFF\x00", "\xFF\xFF\x00\xFF\xFF\x00\xFF\xFF",
+        "\xFF\xFF\x00\xFF\xFF\xFF\x00\x00", "\xFF\xFF\x00\xFF\xFF\xFF\x00\xFF",
+        "\xFF\xFF\x00\xFF\xFF\xFF\xFF\x00", "\xFF\xFF\x00\xFF\xFF\xFF\xFF\xFF",
+        "\xFF\xFF\xFF\x00\x00\x00\x00\x00", "\xFF\xFF\xFF\x00\x00\x00\x00\xFF",
+        "\xFF\xFF\xFF\x00\x00\x00\xFF\x00", "\xFF\xFF\xFF\x00\x00\x00\xFF\xFF",
+        "\xFF\xFF\xFF\x00\x00\xFF\x00\x00", "\xFF\xFF\xFF\x00\x00\xFF\x00\xFF",
+        "\xFF\xFF\xFF\x00\x00\xFF\xFF\x00", "\xFF\xFF\xFF\x00\x00\xFF\xFF\xFF",
+        "\xFF\xFF\xFF\x00\xFF\x00\x00\x00", "\xFF\xFF\xFF\x00\xFF\x00\x00\xFF",
+        "\xFF\xFF\xFF\x00\xFF\x00\xFF\x00", "\xFF\xFF\xFF\x00\xFF\x00\xFF\xFF",
+        "\xFF\xFF\xFF\x00\xFF\xFF\x00\x00", "\xFF\xFF\xFF\x00\xFF\xFF\x00\xFF",
+        "\xFF\xFF\xFF\x00\xFF\xFF\xFF\x00", "\xFF\xFF\xFF\x00\xFF\xFF\xFF\xFF",
+        "\xFF\xFF\xFF\xFF\x00\x00\x00\x00", "\xFF\xFF\xFF\xFF\x00\x00\x00\xFF",
+        "\xFF\xFF\xFF\xFF\x00\x00\xFF\x00", "\xFF\xFF\xFF\xFF\x00\x00\xFF\xFF",
+        "\xFF\xFF\xFF\xFF\x00\xFF\x00\x00", "\xFF\xFF\xFF\xFF\x00\xFF\x00\xFF",
+        "\xFF\xFF\xFF\xFF\x00\xFF\xFF\x00", "\xFF\xFF\xFF\xFF\x00\xFF\xFF\xFF",
+        "\xFF\xFF\xFF\xFF\xFF\x00\x00\x00", "\xFF\xFF\xFF\xFF\xFF\x00\x00\xFF",
+        "\xFF\xFF\xFF\xFF\xFF\x00\xFF\x00", "\xFF\xFF\xFF\xFF\xFF\x00\xFF\xFF",
+        "\xFF\xFF\xFF\xFF\xFF\xFF\x00\x00", "\xFF\xFF\xFF\xFF\xFF\xFF\x00\xFF",
+        "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x00", "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF"
+    );
+
+    /**
+     * IP mapping helper table.
+     *
+     * Indexing this table with each source byte performs the initial bit permutation.
+     *
+     * @var array
+     * @access private
+     */
+    var $ipmap = array(
+        0x00, 0x10, 0x01, 0x11, 0x20, 0x30, 0x21, 0x31,
+        0x02, 0x12, 0x03, 0x13, 0x22, 0x32, 0x23, 0x33,
+        0x40, 0x50, 0x41, 0x51, 0x60, 0x70, 0x61, 0x71,
+        0x42, 0x52, 0x43, 0x53, 0x62, 0x72, 0x63, 0x73,
+        0x04, 0x14, 0x05, 0x15, 0x24, 0x34, 0x25, 0x35,
+        0x06, 0x16, 0x07, 0x17, 0x26, 0x36, 0x27, 0x37,
+        0x44, 0x54, 0x45, 0x55, 0x64, 0x74, 0x65, 0x75,
+        0x46, 0x56, 0x47, 0x57, 0x66, 0x76, 0x67, 0x77,
+        0x80, 0x90, 0x81, 0x91, 0xA0, 0xB0, 0xA1, 0xB1,
+        0x82, 0x92, 0x83, 0x93, 0xA2, 0xB2, 0xA3, 0xB3,
+        0xC0, 0xD0, 0xC1, 0xD1, 0xE0, 0xF0, 0xE1, 0xF1,
+        0xC2, 0xD2, 0xC3, 0xD3, 0xE2, 0xF2, 0xE3, 0xF3,
+        0x84, 0x94, 0x85, 0x95, 0xA4, 0xB4, 0xA5, 0xB5,
+        0x86, 0x96, 0x87, 0x97, 0xA6, 0xB6, 0xA7, 0xB7,
+        0xC4, 0xD4, 0xC5, 0xD5, 0xE4, 0xF4, 0xE5, 0xF5,
+        0xC6, 0xD6, 0xC7, 0xD7, 0xE6, 0xF6, 0xE7, 0xF7,
+        0x08, 0x18, 0x09, 0x19, 0x28, 0x38, 0x29, 0x39,
+        0x0A, 0x1A, 0x0B, 0x1B, 0x2A, 0x3A, 0x2B, 0x3B,
+        0x48, 0x58, 0x49, 0x59, 0x68, 0x78, 0x69, 0x79,
+        0x4A, 0x5A, 0x4B, 0x5B, 0x6A, 0x7A, 0x6B, 0x7B,
+        0x0C, 0x1C, 0x0D, 0x1D, 0x2C, 0x3C, 0x2D, 0x3D,
+        0x0E, 0x1E, 0x0F, 0x1F, 0x2E, 0x3E, 0x2F, 0x3F,
+        0x4C, 0x5C, 0x4D, 0x5D, 0x6C, 0x7C, 0x6D, 0x7D,
+        0x4E, 0x5E, 0x4F, 0x5F, 0x6E, 0x7E, 0x6F, 0x7F,
+        0x88, 0x98, 0x89, 0x99, 0xA8, 0xB8, 0xA9, 0xB9,
+        0x8A, 0x9A, 0x8B, 0x9B, 0xAA, 0xBA, 0xAB, 0xBB,
+        0xC8, 0xD8, 0xC9, 0xD9, 0xE8, 0xF8, 0xE9, 0xF9,
+        0xCA, 0xDA, 0xCB, 0xDB, 0xEA, 0xFA, 0xEB, 0xFB,
+        0x8C, 0x9C, 0x8D, 0x9D, 0xAC, 0xBC, 0xAD, 0xBD,
+        0x8E, 0x9E, 0x8F, 0x9F, 0xAE, 0xBE, 0xAF, 0xBF,
+        0xCC, 0xDC, 0xCD, 0xDD, 0xEC, 0xFC, 0xED, 0xFD,
+        0xCE, 0xDE, 0xCF, 0xDF, 0xEE, 0xFE, 0xEF, 0xFF
+    );
+
+    /**
+     * Inverse IP mapping helper table.
+     * Indexing this table with a byte value reverses the bit order.
+     *
+     * @var array
+     * @access private
+     */
+    var $invipmap = array(
+        0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0,
+        0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0,
+        0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8,
+        0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8,
+        0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4,
+        0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4,
+        0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC,
+        0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC,
+        0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2,
+        0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2,
+        0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA,
+        0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA,
+        0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6,
+        0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6,
+        0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE,
+        0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE,
+        0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1,
+        0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1,
+        0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9,
+        0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9,
+        0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5,
+        0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5,
+        0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED,
+        0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD,
+        0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3,
+        0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3,
+        0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB,
+        0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB,
+        0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7,
+        0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7,
+        0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF,
+        0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF
+    );
+
+    /**
+     * Pre-permuted S-box1
+     *
+     * Each box ($sbox1-$sbox8) has been vectorized, then each value pre-permuted using the
+     * P table: concatenation can then be replaced by exclusive ORs.
+     *
+     * @var array
+     * @access private
+     */
+    var $sbox1 = array(
+        0x00808200, 0x00000000, 0x00008000, 0x00808202,
+        0x00808002, 0x00008202, 0x00000002, 0x00008000,
+        0x00000200, 0x00808200, 0x00808202, 0x00000200,
+        0x00800202, 0x00808002, 0x00800000, 0x00000002,
+        0x00000202, 0x00800200, 0x00800200, 0x00008200,
+        0x00008200, 0x00808000, 0x00808000, 0x00800202,
+        0x00008002, 0x00800002, 0x00800002, 0x00008002,
+        0x00000000, 0x00000202, 0x00008202, 0x00800000,
+        0x00008000, 0x00808202, 0x00000002, 0x00808000,
+        0x00808200, 0x00800000, 0x00800000, 0x00000200,
+        0x00808002, 0x00008000, 0x00008200, 0x00800002,
+        0x00000200, 0x00000002, 0x00800202, 0x00008202,
+        0x00808202, 0x00008002, 0x00808000, 0x00800202,
+        0x00800002, 0x00000202, 0x00008202, 0x00808200,
+        0x00000202, 0x00800200, 0x00800200, 0x00000000,
+        0x00008002, 0x00008200, 0x00000000, 0x00808002
+    );
+
+    /**
+     * Pre-permuted S-box2
+     *
+     * @var array
+     * @access private
+     */
+    var $sbox2 = array(
+        0x40084010, 0x40004000, 0x00004000, 0x00084010,
+        0x00080000, 0x00000010, 0x40080010, 0x40004010,
+        0x40000010, 0x40084010, 0x40084000, 0x40000000,
+        0x40004000, 0x00080000, 0x00000010, 0x40080010,
+        0x00084000, 0x00080010, 0x40004010, 0x00000000,
+        0x40000000, 0x00004000, 0x00084010, 0x40080000,
+        0x00080010, 0x40000010, 0x00000000, 0x00084000,
+        0x00004010, 0x40084000, 0x40080000, 0x00004010,
+        0x00000000, 0x00084010, 0x40080010, 0x00080000,
+        0x40004010, 0x40080000, 0x40084000, 0x00004000,
+        0x40080000, 0x40004000, 0x00000010, 0x40084010,
+        0x00084010, 0x00000010, 0x00004000, 0x40000000,
+        0x00004010, 0x40084000, 0x00080000, 0x40000010,
+        0x00080010, 0x40004010, 0x40000010, 0x00080010,
+        0x00084000, 0x00000000, 0x40004000, 0x00004010,
+        0x40000000, 0x40080010, 0x40084010, 0x00084000
+    );
+
+    /**
+     * Pre-permuted S-box3
+     *
+     * @var array
+     * @access private
+     */
+    var $sbox3 = array(
+        0x00000104, 0x04010100, 0x00000000, 0x04010004,
+        0x04000100, 0x00000000, 0x00010104, 0x04000100,
+        0x00010004, 0x04000004, 0x04000004, 0x00010000,
+        0x04010104, 0x00010004, 0x04010000, 0x00000104,
+        0x04000000, 0x00000004, 0x04010100, 0x00000100,
+        0x00010100, 0x04010000, 0x04010004, 0x00010104,
+        0x04000104, 0x00010100, 0x00010000, 0x04000104,
+        0x00000004, 0x04010104, 0x00000100, 0x04000000,
+        0x04010100, 0x04000000, 0x00010004, 0x00000104,
+        0x00010000, 0x04010100, 0x04000100, 0x00000000,
+        0x00000100, 0x00010004, 0x04010104, 0x04000100,
+        0x04000004, 0x00000100, 0x00000000, 0x04010004,
+        0x04000104, 0x00010000, 0x04000000, 0x04010104,
+        0x00000004, 0x00010104, 0x00010100, 0x04000004,
+        0x04010000, 0x04000104, 0x00000104, 0x04010000,
+        0x00010104, 0x00000004, 0x04010004, 0x00010100
+    );
+
+    /**
+     * Pre-permuted S-box4
+     *
+     * @var array
+     * @access private
+     */
+    var $sbox4 = array(
+        0x80401000, 0x80001040, 0x80001040, 0x00000040,
+        0x00401040, 0x80400040, 0x80400000, 0x80001000,
+        0x00000000, 0x00401000, 0x00401000, 0x80401040,
+        0x80000040, 0x00000000, 0x00400040, 0x80400000,
+        0x80000000, 0x00001000, 0x00400000, 0x80401000,
+        0x00000040, 0x00400000, 0x80001000, 0x00001040,
+        0x80400040, 0x80000000, 0x00001040, 0x00400040,
+        0x00001000, 0x00401040, 0x80401040, 0x80000040,
+        0x00400040, 0x80400000, 0x00401000, 0x80401040,
+        0x80000040, 0x00000000, 0x00000000, 0x00401000,
+        0x00001040, 0x00400040, 0x80400040, 0x80000000,
+        0x80401000, 0x80001040, 0x80001040, 0x00000040,
+        0x80401040, 0x80000040, 0x80000000, 0x00001000,
+        0x80400000, 0x80001000, 0x00401040, 0x80400040,
+        0x80001000, 0x00001040, 0x00400000, 0x80401000,
+        0x00000040, 0x00400000, 0x00001000, 0x00401040
+    );
+
+    /**
+     * Pre-permuted S-box5
+     *
+     * @var array
+     * @access private
+     */
+    var $sbox5 = array(
+        0x00000080, 0x01040080, 0x01040000, 0x21000080,
+        0x00040000, 0x00000080, 0x20000000, 0x01040000,
+        0x20040080, 0x00040000, 0x01000080, 0x20040080,
+        0x21000080, 0x21040000, 0x00040080, 0x20000000,
+        0x01000000, 0x20040000, 0x20040000, 0x00000000,
+        0x20000080, 0x21040080, 0x21040080, 0x01000080,
+        0x21040000, 0x20000080, 0x00000000, 0x21000000,
+        0x01040080, 0x01000000, 0x21000000, 0x00040080,
+        0x00040000, 0x21000080, 0x00000080, 0x01000000,
+        0x20000000, 0x01040000, 0x21000080, 0x20040080,
+        0x01000080, 0x20000000, 0x21040000, 0x01040080,
+        0x20040080, 0x00000080, 0x01000000, 0x21040000,
+        0x21040080, 0x00040080, 0x21000000, 0x21040080,
+        0x01040000, 0x00000000, 0x20040000, 0x21000000,
+        0x00040080, 0x01000080, 0x20000080, 0x00040000,
+        0x00000000, 0x20040000, 0x01040080, 0x20000080
+    );
+
+    /**
+     * Pre-permuted S-box6
+     *
+     * @var array
+     * @access private
+     */
+    var $sbox6 = array(
+        0x10000008, 0x10200000, 0x00002000, 0x10202008,
+        0x10200000, 0x00000008, 0x10202008, 0x00200000,
+        0x10002000, 0x00202008, 0x00200000, 0x10000008,
+        0x00200008, 0x10002000, 0x10000000, 0x00002008,
+        0x00000000, 0x00200008, 0x10002008, 0x00002000,
+        0x00202000, 0x10002008, 0x00000008, 0x10200008,
+        0x10200008, 0x00000000, 0x00202008, 0x10202000,
+        0x00002008, 0x00202000, 0x10202000, 0x10000000,
+        0x10002000, 0x00000008, 0x10200008, 0x00202000,
+        0x10202008, 0x00200000, 0x00002008, 0x10000008,
+        0x00200000, 0x10002000, 0x10000000, 0x00002008,
+        0x10000008, 0x10202008, 0x00202000, 0x10200000,
+        0x00202008, 0x10202000, 0x00000000, 0x10200008,
+        0x00000008, 0x00002000, 0x10200000, 0x00202008,
+        0x00002000, 0x00200008, 0x10002008, 0x00000000,
+        0x10202000, 0x10000000, 0x00200008, 0x10002008
+    );
+
+    /**
+     * Pre-permuted S-box7
+     *
+     * @var array
+     * @access private
+     */
+    var $sbox7 = array(
+        0x00100000, 0x02100001, 0x02000401, 0x00000000,
+        0x00000400, 0x02000401, 0x00100401, 0x02100400,
+        0x02100401, 0x00100000, 0x00000000, 0x02000001,
+        0x00000001, 0x02000000, 0x02100001, 0x00000401,
+        0x02000400, 0x00100401, 0x00100001, 0x02000400,
+        0x02000001, 0x02100000, 0x02100400, 0x00100001,
+        0x02100000, 0x00000400, 0x00000401, 0x02100401,
+        0x00100400, 0x00000001, 0x02000000, 0x00100400,
+        0x02000000, 0x00100400, 0x00100000, 0x02000401,
+        0x02000401, 0x02100001, 0x02100001, 0x00000001,
+        0x00100001, 0x02000000, 0x02000400, 0x00100000,
+        0x02100400, 0x00000401, 0x00100401, 0x02100400,
+        0x00000401, 0x02000001, 0x02100401, 0x02100000,
+        0x00100400, 0x00000000, 0x00000001, 0x02100401,
+        0x00000000, 0x00100401, 0x02100000, 0x00000400,
+        0x02000001, 0x02000400, 0x00000400, 0x00100001
+    );
+
+    /**
+     * Pre-permuted S-box8
+     *
+     * @var array
+     * @access private
+     */
+    var $sbox8 = array(
+        0x08000820, 0x00000800, 0x00020000, 0x08020820,
+        0x08000000, 0x08000820, 0x00000020, 0x08000000,
+        0x00020020, 0x08020000, 0x08020820, 0x00020800,
+        0x08020800, 0x00020820, 0x00000800, 0x00000020,
+        0x08020000, 0x08000020, 0x08000800, 0x00000820,
+        0x00020800, 0x00020020, 0x08020020, 0x08020800,
+        0x00000820, 0x00000000, 0x00000000, 0x08020020,
+        0x08000020, 0x08000800, 0x00020820, 0x00020000,
+        0x00020820, 0x00020000, 0x08020800, 0x00000800,
+        0x00000020, 0x08020020, 0x00000800, 0x00020820,
+        0x08000800, 0x00000020, 0x08000020, 0x08020000,
+        0x08020020, 0x08000000, 0x00020000, 0x08000820,
+        0x00000000, 0x08020820, 0x00020020, 0x08000020,
+        0x08020000, 0x08000800, 0x08000820, 0x00000000,
+        0x08020820, 0x00020800, 0x00020800, 0x00000820,
+        0x00000820, 0x00020020, 0x08000000, 0x08020800
+    );
+
+    /**
+     * Test for engine validity
+     *
+     * This is mainly just a wrapper to set things up for Crypt_Base::isValidEngine()
+     *
+     * @see Crypt_Base::isValidEngine()
+     * @param int $engine
+     * @access public
+     * @return bool
+     */
+    function isValidEngine($engine)
+    {
+        if ($this->key_length_max == 8) {
+            if ($engine == CRYPT_ENGINE_OPENSSL) {
+                $this->cipher_name_openssl_ecb = 'des-ecb';
+                $this->cipher_name_openssl = 'des-' . $this->_openssl_translate_mode();
+            }
+        }
+
+        return parent::isValidEngine($engine);
+    }
+
+    /**
+     * Sets the key.
+     *
+     * Keys can be of any length.  DES, itself, uses 64-bit keys (eg. strlen($key) == 8), however, we
+     * only use the first eight, if $key has more then eight characters in it, and pad $key with the
+     * null byte if it is less then eight characters long.
+     *
+     * DES also requires that every eighth bit be a parity bit, however, we'll ignore that.
+     *
+     * If the key is not explicitly set, it'll be assumed to be all zero's.
+     *
+     * @see Crypt_Base::setKey()
+     * @access public
+     * @param string $key
+     */
+    function setKey($key)
+    {
+        // We check/cut here only up to max length of the key.
+        // Key padding to the proper length will be done in _setupKey()
+        if (strlen($key) > $this->key_length_max) {
+            $key = substr($key, 0, $this->key_length_max);
+        }
+
+        // Sets the key
+        parent::setKey($key);
+    }
+
+    /**
+     * Encrypts a block
+     *
+     * @see Crypt_Base::_encryptBlock()
+     * @see Crypt_Base::encrypt()
+     * @see self::encrypt()
+     * @access private
+     * @param string $in
+     * @return string
+     */
+    function _encryptBlock($in)
+    {
+        return $this->_processBlock($in, CRYPT_DES_ENCRYPT);
+    }
+
+    /**
+     * Decrypts a block
+     *
+     * @see Crypt_Base::_decryptBlock()
+     * @see Crypt_Base::decrypt()
+     * @see self::decrypt()
+     * @access private
+     * @param string $in
+     * @return string
+     */
+    function _decryptBlock($in)
+    {
+        return $this->_processBlock($in, CRYPT_DES_DECRYPT);
+    }
+
+    /**
+     * Encrypts or decrypts a 64-bit block
+     *
+     * $mode should be either CRYPT_DES_ENCRYPT or CRYPT_DES_DECRYPT.  See
+     * {@link http://en.wikipedia.org/wiki/Image:Feistel.png Feistel.png} to get a general
+     * idea of what this function does.
+     *
+     * @see self::_encryptBlock()
+     * @see self::_decryptBlock()
+     * @access private
+     * @param string $block
+     * @param int $mode
+     * @return string
+     */
+    function _processBlock($block, $mode)
+    {
+        static $sbox1, $sbox2, $sbox3, $sbox4, $sbox5, $sbox6, $sbox7, $sbox8, $shuffleip, $shuffleinvip;
+        if (!$sbox1) {
+            $sbox1 = array_map("intval", $this->sbox1);
+            $sbox2 = array_map("intval", $this->sbox2);
+            $sbox3 = array_map("intval", $this->sbox3);
+            $sbox4 = array_map("intval", $this->sbox4);
+            $sbox5 = array_map("intval", $this->sbox5);
+            $sbox6 = array_map("intval", $this->sbox6);
+            $sbox7 = array_map("intval", $this->sbox7);
+            $sbox8 = array_map("intval", $this->sbox8);
+            /* Merge $shuffle with $[inv]ipmap */
+            for ($i = 0; $i < 256; ++$i) {
+                $shuffleip[]    =  $this->shuffle[$this->ipmap[$i]];
+                $shuffleinvip[] =  $this->shuffle[$this->invipmap[$i]];
+            }
+        }
+
+        $keys  = $this->keys[$mode];
+        $ki    = -1;
+
+        // Do the initial IP permutation.
+        $t = unpack('Nl/Nr', $block);
+        list($l, $r) = array($t['l'], $t['r']);
+        $block = ($shuffleip[ $r        & 0xFF] & "\x80\x80\x80\x80\x80\x80\x80\x80") |
+                 ($shuffleip[($r >>  8) & 0xFF] & "\x40\x40\x40\x40\x40\x40\x40\x40") |
+                 ($shuffleip[($r >> 16) & 0xFF] & "\x20\x20\x20\x20\x20\x20\x20\x20") |
+                 ($shuffleip[($r >> 24) & 0xFF] & "\x10\x10\x10\x10\x10\x10\x10\x10") |
+                 ($shuffleip[ $l        & 0xFF] & "\x08\x08\x08\x08\x08\x08\x08\x08") |
+                 ($shuffleip[($l >>  8) & 0xFF] & "\x04\x04\x04\x04\x04\x04\x04\x04") |
+                 ($shuffleip[($l >> 16) & 0xFF] & "\x02\x02\x02\x02\x02\x02\x02\x02") |
+                 ($shuffleip[($l >> 24) & 0xFF] & "\x01\x01\x01\x01\x01\x01\x01\x01");
+
+        // Extract L0 and R0.
+        $t = unpack('Nl/Nr', $block);
+        list($l, $r) = array($t['l'], $t['r']);
+
+        for ($des_round = 0; $des_round < $this->des_rounds; ++$des_round) {
+            // Perform the 16 steps.
+            for ($i = 0; $i < 16; $i++) {
+                // start of "the Feistel (F) function" - see the following URL:
+                // http://en.wikipedia.org/wiki/Image:Data_Encryption_Standard_InfoBox_Diagram.png
+                // Merge key schedule.
+                $b1 = (($r >>  3) & 0x1FFFFFFF) ^ ($r << 29) ^ $keys[++$ki];
+                $b2 = (($r >> 31) & 0x00000001) ^ ($r <<  1) ^ $keys[++$ki];
+
+                // S-box indexing.
+                $t = $sbox1[($b1 >> 24) & 0x3F] ^ $sbox2[($b2 >> 24) & 0x3F] ^
+                     $sbox3[($b1 >> 16) & 0x3F] ^ $sbox4[($b2 >> 16) & 0x3F] ^
+                     $sbox5[($b1 >>  8) & 0x3F] ^ $sbox6[($b2 >>  8) & 0x3F] ^
+                     $sbox7[ $b1        & 0x3F] ^ $sbox8[ $b2        & 0x3F] ^ $l;
+                // end of "the Feistel (F) function"
+
+                $l = $r;
+                $r = $t;
+            }
+
+            // Last step should not permute L & R.
+            $t = $l;
+            $l = $r;
+            $r = $t;
+        }
+
+        // Perform the inverse IP permutation.
+        return ($shuffleinvip[($r >> 24) & 0xFF] & "\x80\x80\x80\x80\x80\x80\x80\x80") |
+               ($shuffleinvip[($l >> 24) & 0xFF] & "\x40\x40\x40\x40\x40\x40\x40\x40") |
+               ($shuffleinvip[($r >> 16) & 0xFF] & "\x20\x20\x20\x20\x20\x20\x20\x20") |
+               ($shuffleinvip[($l >> 16) & 0xFF] & "\x10\x10\x10\x10\x10\x10\x10\x10") |
+               ($shuffleinvip[($r >>  8) & 0xFF] & "\x08\x08\x08\x08\x08\x08\x08\x08") |
+               ($shuffleinvip[($l >>  8) & 0xFF] & "\x04\x04\x04\x04\x04\x04\x04\x04") |
+               ($shuffleinvip[ $r        & 0xFF] & "\x02\x02\x02\x02\x02\x02\x02\x02") |
+               ($shuffleinvip[ $l        & 0xFF] & "\x01\x01\x01\x01\x01\x01\x01\x01");
+    }
+
+    /**
+     * Creates the key schedule
+     *
+     * @see Crypt_Base::_setupKey()
+     * @access private
+     */
+    function _setupKey()
+    {
+        if (isset($this->kl['key']) && $this->key === $this->kl['key'] && $this->des_rounds === $this->kl['des_rounds']) {
+            // already expanded
+            return;
+        }
+        $this->kl = array('key' => $this->key, 'des_rounds' => $this->des_rounds);
+
+        static $shifts = array( // number of key bits shifted per round
+            1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1
+        );
+
+        static $pc1map = array(
+            0x00, 0x00, 0x08, 0x08, 0x04, 0x04, 0x0C, 0x0C,
+            0x02, 0x02, 0x0A, 0x0A, 0x06, 0x06, 0x0E, 0x0E,
+            0x10, 0x10, 0x18, 0x18, 0x14, 0x14, 0x1C, 0x1C,
+            0x12, 0x12, 0x1A, 0x1A, 0x16, 0x16, 0x1E, 0x1E,
+            0x20, 0x20, 0x28, 0x28, 0x24, 0x24, 0x2C, 0x2C,
+            0x22, 0x22, 0x2A, 0x2A, 0x26, 0x26, 0x2E, 0x2E,
+            0x30, 0x30, 0x38, 0x38, 0x34, 0x34, 0x3C, 0x3C,
+            0x32, 0x32, 0x3A, 0x3A, 0x36, 0x36, 0x3E, 0x3E,
+            0x40, 0x40, 0x48, 0x48, 0x44, 0x44, 0x4C, 0x4C,
+            0x42, 0x42, 0x4A, 0x4A, 0x46, 0x46, 0x4E, 0x4E,
+            0x50, 0x50, 0x58, 0x58, 0x54, 0x54, 0x5C, 0x5C,
+            0x52, 0x52, 0x5A, 0x5A, 0x56, 0x56, 0x5E, 0x5E,
+            0x60, 0x60, 0x68, 0x68, 0x64, 0x64, 0x6C, 0x6C,
+            0x62, 0x62, 0x6A, 0x6A, 0x66, 0x66, 0x6E, 0x6E,
+            0x70, 0x70, 0x78, 0x78, 0x74, 0x74, 0x7C, 0x7C,
+            0x72, 0x72, 0x7A, 0x7A, 0x76, 0x76, 0x7E, 0x7E,
+            0x80, 0x80, 0x88, 0x88, 0x84, 0x84, 0x8C, 0x8C,
+            0x82, 0x82, 0x8A, 0x8A, 0x86, 0x86, 0x8E, 0x8E,
+            0x90, 0x90, 0x98, 0x98, 0x94, 0x94, 0x9C, 0x9C,
+            0x92, 0x92, 0x9A, 0x9A, 0x96, 0x96, 0x9E, 0x9E,
+            0xA0, 0xA0, 0xA8, 0xA8, 0xA4, 0xA4, 0xAC, 0xAC,
+            0xA2, 0xA2, 0xAA, 0xAA, 0xA6, 0xA6, 0xAE, 0xAE,
+            0xB0, 0xB0, 0xB8, 0xB8, 0xB4, 0xB4, 0xBC, 0xBC,
+            0xB2, 0xB2, 0xBA, 0xBA, 0xB6, 0xB6, 0xBE, 0xBE,
+            0xC0, 0xC0, 0xC8, 0xC8, 0xC4, 0xC4, 0xCC, 0xCC,
+            0xC2, 0xC2, 0xCA, 0xCA, 0xC6, 0xC6, 0xCE, 0xCE,
+            0xD0, 0xD0, 0xD8, 0xD8, 0xD4, 0xD4, 0xDC, 0xDC,
+            0xD2, 0xD2, 0xDA, 0xDA, 0xD6, 0xD6, 0xDE, 0xDE,
+            0xE0, 0xE0, 0xE8, 0xE8, 0xE4, 0xE4, 0xEC, 0xEC,
+            0xE2, 0xE2, 0xEA, 0xEA, 0xE6, 0xE6, 0xEE, 0xEE,
+            0xF0, 0xF0, 0xF8, 0xF8, 0xF4, 0xF4, 0xFC, 0xFC,
+            0xF2, 0xF2, 0xFA, 0xFA, 0xF6, 0xF6, 0xFE, 0xFE
+        );
+
+        // Mapping tables for the PC-2 transformation.
+        static $pc2mapc1 = array(
+            0x00000000, 0x00000400, 0x00200000, 0x00200400,
+            0x00000001, 0x00000401, 0x00200001, 0x00200401,
+            0x02000000, 0x02000400, 0x02200000, 0x02200400,
+            0x02000001, 0x02000401, 0x02200001, 0x02200401
+        );
+        static $pc2mapc2 = array(
+            0x00000000, 0x00000800, 0x08000000, 0x08000800,
+            0x00010000, 0x00010800, 0x08010000, 0x08010800,
+            0x00000000, 0x00000800, 0x08000000, 0x08000800,
+            0x00010000, 0x00010800, 0x08010000, 0x08010800,
+            0x00000100, 0x00000900, 0x08000100, 0x08000900,
+            0x00010100, 0x00010900, 0x08010100, 0x08010900,
+            0x00000100, 0x00000900, 0x08000100, 0x08000900,
+            0x00010100, 0x00010900, 0x08010100, 0x08010900,
+            0x00000010, 0x00000810, 0x08000010, 0x08000810,
+            0x00010010, 0x00010810, 0x08010010, 0x08010810,
+            0x00000010, 0x00000810, 0x08000010, 0x08000810,
+            0x00010010, 0x00010810, 0x08010010, 0x08010810,
+            0x00000110, 0x00000910, 0x08000110, 0x08000910,
+            0x00010110, 0x00010910, 0x08010110, 0x08010910,
+            0x00000110, 0x00000910, 0x08000110, 0x08000910,
+            0x00010110, 0x00010910, 0x08010110, 0x08010910,
+            0x00040000, 0x00040800, 0x08040000, 0x08040800,
+            0x00050000, 0x00050800, 0x08050000, 0x08050800,
+            0x00040000, 0x00040800, 0x08040000, 0x08040800,
+            0x00050000, 0x00050800, 0x08050000, 0x08050800,
+            0x00040100, 0x00040900, 0x08040100, 0x08040900,
+            0x00050100, 0x00050900, 0x08050100, 0x08050900,
+            0x00040100, 0x00040900, 0x08040100, 0x08040900,
+            0x00050100, 0x00050900, 0x08050100, 0x08050900,
+            0x00040010, 0x00040810, 0x08040010, 0x08040810,
+            0x00050010, 0x00050810, 0x08050010, 0x08050810,
+            0x00040010, 0x00040810, 0x08040010, 0x08040810,
+            0x00050010, 0x00050810, 0x08050010, 0x08050810,
+            0x00040110, 0x00040910, 0x08040110, 0x08040910,
+            0x00050110, 0x00050910, 0x08050110, 0x08050910,
+            0x00040110, 0x00040910, 0x08040110, 0x08040910,
+            0x00050110, 0x00050910, 0x08050110, 0x08050910,
+            0x01000000, 0x01000800, 0x09000000, 0x09000800,
+            0x01010000, 0x01010800, 0x09010000, 0x09010800,
+            0x01000000, 0x01000800, 0x09000000, 0x09000800,
+            0x01010000, 0x01010800, 0x09010000, 0x09010800,
+            0x01000100, 0x01000900, 0x09000100, 0x09000900,
+            0x01010100, 0x01010900, 0x09010100, 0x09010900,
+            0x01000100, 0x01000900, 0x09000100, 0x09000900,
+            0x01010100, 0x01010900, 0x09010100, 0x09010900,
+            0x01000010, 0x01000810, 0x09000010, 0x09000810,
+            0x01010010, 0x01010810, 0x09010010, 0x09010810,
+            0x01000010, 0x01000810, 0x09000010, 0x09000810,
+            0x01010010, 0x01010810, 0x09010010, 0x09010810,
+            0x01000110, 0x01000910, 0x09000110, 0x09000910,
+            0x01010110, 0x01010910, 0x09010110, 0x09010910,
+            0x01000110, 0x01000910, 0x09000110, 0x09000910,
+            0x01010110, 0x01010910, 0x09010110, 0x09010910,
+            0x01040000, 0x01040800, 0x09040000, 0x09040800,
+            0x01050000, 0x01050800, 0x09050000, 0x09050800,
+            0x01040000, 0x01040800, 0x09040000, 0x09040800,
+            0x01050000, 0x01050800, 0x09050000, 0x09050800,
+            0x01040100, 0x01040900, 0x09040100, 0x09040900,
+            0x01050100, 0x01050900, 0x09050100, 0x09050900,
+            0x01040100, 0x01040900, 0x09040100, 0x09040900,
+            0x01050100, 0x01050900, 0x09050100, 0x09050900,
+            0x01040010, 0x01040810, 0x09040010, 0x09040810,
+            0x01050010, 0x01050810, 0x09050010, 0x09050810,
+            0x01040010, 0x01040810, 0x09040010, 0x09040810,
+            0x01050010, 0x01050810, 0x09050010, 0x09050810,
+            0x01040110, 0x01040910, 0x09040110, 0x09040910,
+            0x01050110, 0x01050910, 0x09050110, 0x09050910,
+            0x01040110, 0x01040910, 0x09040110, 0x09040910,
+            0x01050110, 0x01050910, 0x09050110, 0x09050910
+        );
+        static $pc2mapc3 = array(
+            0x00000000, 0x00000004, 0x00001000, 0x00001004,
+            0x00000000, 0x00000004, 0x00001000, 0x00001004,
+            0x10000000, 0x10000004, 0x10001000, 0x10001004,
+            0x10000000, 0x10000004, 0x10001000, 0x10001004,
+            0x00000020, 0x00000024, 0x00001020, 0x00001024,
+            0x00000020, 0x00000024, 0x00001020, 0x00001024,
+            0x10000020, 0x10000024, 0x10001020, 0x10001024,
+            0x10000020, 0x10000024, 0x10001020, 0x10001024,
+            0x00080000, 0x00080004, 0x00081000, 0x00081004,
+            0x00080000, 0x00080004, 0x00081000, 0x00081004,
+            0x10080000, 0x10080004, 0x10081000, 0x10081004,
+            0x10080000, 0x10080004, 0x10081000, 0x10081004,
+            0x00080020, 0x00080024, 0x00081020, 0x00081024,
+            0x00080020, 0x00080024, 0x00081020, 0x00081024,
+            0x10080020, 0x10080024, 0x10081020, 0x10081024,
+            0x10080020, 0x10080024, 0x10081020, 0x10081024,
+            0x20000000, 0x20000004, 0x20001000, 0x20001004,
+            0x20000000, 0x20000004, 0x20001000, 0x20001004,
+            0x30000000, 0x30000004, 0x30001000, 0x30001004,
+            0x30000000, 0x30000004, 0x30001000, 0x30001004,
+            0x20000020, 0x20000024, 0x20001020, 0x20001024,
+            0x20000020, 0x20000024, 0x20001020, 0x20001024,
+            0x30000020, 0x30000024, 0x30001020, 0x30001024,
+            0x30000020, 0x30000024, 0x30001020, 0x30001024,
+            0x20080000, 0x20080004, 0x20081000, 0x20081004,
+            0x20080000, 0x20080004, 0x20081000, 0x20081004,
+            0x30080000, 0x30080004, 0x30081000, 0x30081004,
+            0x30080000, 0x30080004, 0x30081000, 0x30081004,
+            0x20080020, 0x20080024, 0x20081020, 0x20081024,
+            0x20080020, 0x20080024, 0x20081020, 0x20081024,
+            0x30080020, 0x30080024, 0x30081020, 0x30081024,
+            0x30080020, 0x30080024, 0x30081020, 0x30081024,
+            0x00000002, 0x00000006, 0x00001002, 0x00001006,
+            0x00000002, 0x00000006, 0x00001002, 0x00001006,
+            0x10000002, 0x10000006, 0x10001002, 0x10001006,
+            0x10000002, 0x10000006, 0x10001002, 0x10001006,
+            0x00000022, 0x00000026, 0x00001022, 0x00001026,
+            0x00000022, 0x00000026, 0x00001022, 0x00001026,
+            0x10000022, 0x10000026, 0x10001022, 0x10001026,
+            0x10000022, 0x10000026, 0x10001022, 0x10001026,
+            0x00080002, 0x00080006, 0x00081002, 0x00081006,
+            0x00080002, 0x00080006, 0x00081002, 0x00081006,
+            0x10080002, 0x10080006, 0x10081002, 0x10081006,
+            0x10080002, 0x10080006, 0x10081002, 0x10081006,
+            0x00080022, 0x00080026, 0x00081022, 0x00081026,
+            0x00080022, 0x00080026, 0x00081022, 0x00081026,
+            0x10080022, 0x10080026, 0x10081022, 0x10081026,
+            0x10080022, 0x10080026, 0x10081022, 0x10081026,
+            0x20000002, 0x20000006, 0x20001002, 0x20001006,
+            0x20000002, 0x20000006, 0x20001002, 0x20001006,
+            0x30000002, 0x30000006, 0x30001002, 0x30001006,
+            0x30000002, 0x30000006, 0x30001002, 0x30001006,
+            0x20000022, 0x20000026, 0x20001022, 0x20001026,
+            0x20000022, 0x20000026, 0x20001022, 0x20001026,
+            0x30000022, 0x30000026, 0x30001022, 0x30001026,
+            0x30000022, 0x30000026, 0x30001022, 0x30001026,
+            0x20080002, 0x20080006, 0x20081002, 0x20081006,
+            0x20080002, 0x20080006, 0x20081002, 0x20081006,
+            0x30080002, 0x30080006, 0x30081002, 0x30081006,
+            0x30080002, 0x30080006, 0x30081002, 0x30081006,
+            0x20080022, 0x20080026, 0x20081022, 0x20081026,
+            0x20080022, 0x20080026, 0x20081022, 0x20081026,
+            0x30080022, 0x30080026, 0x30081022, 0x30081026,
+            0x30080022, 0x30080026, 0x30081022, 0x30081026
+        );
+        static $pc2mapc4 = array(
+            0x00000000, 0x00100000, 0x00000008, 0x00100008,
+            0x00000200, 0x00100200, 0x00000208, 0x00100208,
+            0x00000000, 0x00100000, 0x00000008, 0x00100008,
+            0x00000200, 0x00100200, 0x00000208, 0x00100208,
+            0x04000000, 0x04100000, 0x04000008, 0x04100008,
+            0x04000200, 0x04100200, 0x04000208, 0x04100208,
+            0x04000000, 0x04100000, 0x04000008, 0x04100008,
+            0x04000200, 0x04100200, 0x04000208, 0x04100208,
+            0x00002000, 0x00102000, 0x00002008, 0x00102008,
+            0x00002200, 0x00102200, 0x00002208, 0x00102208,
+            0x00002000, 0x00102000, 0x00002008, 0x00102008,
+            0x00002200, 0x00102200, 0x00002208, 0x00102208,
+            0x04002000, 0x04102000, 0x04002008, 0x04102008,
+            0x04002200, 0x04102200, 0x04002208, 0x04102208,
+            0x04002000, 0x04102000, 0x04002008, 0x04102008,
+            0x04002200, 0x04102200, 0x04002208, 0x04102208,
+            0x00000000, 0x00100000, 0x00000008, 0x00100008,
+            0x00000200, 0x00100200, 0x00000208, 0x00100208,
+            0x00000000, 0x00100000, 0x00000008, 0x00100008,
+            0x00000200, 0x00100200, 0x00000208, 0x00100208,
+            0x04000000, 0x04100000, 0x04000008, 0x04100008,
+            0x04000200, 0x04100200, 0x04000208, 0x04100208,
+            0x04000000, 0x04100000, 0x04000008, 0x04100008,
+            0x04000200, 0x04100200, 0x04000208, 0x04100208,
+            0x00002000, 0x00102000, 0x00002008, 0x00102008,
+            0x00002200, 0x00102200, 0x00002208, 0x00102208,
+            0x00002000, 0x00102000, 0x00002008, 0x00102008,
+            0x00002200, 0x00102200, 0x00002208, 0x00102208,
+            0x04002000, 0x04102000, 0x04002008, 0x04102008,
+            0x04002200, 0x04102200, 0x04002208, 0x04102208,
+            0x04002000, 0x04102000, 0x04002008, 0x04102008,
+            0x04002200, 0x04102200, 0x04002208, 0x04102208,
+            0x00020000, 0x00120000, 0x00020008, 0x00120008,
+            0x00020200, 0x00120200, 0x00020208, 0x00120208,
+            0x00020000, 0x00120000, 0x00020008, 0x00120008,
+            0x00020200, 0x00120200, 0x00020208, 0x00120208,
+            0x04020000, 0x04120000, 0x04020008, 0x04120008,
+            0x04020200, 0x04120200, 0x04020208, 0x04120208,
+            0x04020000, 0x04120000, 0x04020008, 0x04120008,
+            0x04020200, 0x04120200, 0x04020208, 0x04120208,
+            0x00022000, 0x00122000, 0x00022008, 0x00122008,
+            0x00022200, 0x00122200, 0x00022208, 0x00122208,
+            0x00022000, 0x00122000, 0x00022008, 0x00122008,
+            0x00022200, 0x00122200, 0x00022208, 0x00122208,
+            0x04022000, 0x04122000, 0x04022008, 0x04122008,
+            0x04022200, 0x04122200, 0x04022208, 0x04122208,
+            0x04022000, 0x04122000, 0x04022008, 0x04122008,
+            0x04022200, 0x04122200, 0x04022208, 0x04122208,
+            0x00020000, 0x00120000, 0x00020008, 0x00120008,
+            0x00020200, 0x00120200, 0x00020208, 0x00120208,
+            0x00020000, 0x00120000, 0x00020008, 0x00120008,
+            0x00020200, 0x00120200, 0x00020208, 0x00120208,
+            0x04020000, 0x04120000, 0x04020008, 0x04120008,
+            0x04020200, 0x04120200, 0x04020208, 0x04120208,
+            0x04020000, 0x04120000, 0x04020008, 0x04120008,
+            0x04020200, 0x04120200, 0x04020208, 0x04120208,
+            0x00022000, 0x00122000, 0x00022008, 0x00122008,
+            0x00022200, 0x00122200, 0x00022208, 0x00122208,
+            0x00022000, 0x00122000, 0x00022008, 0x00122008,
+            0x00022200, 0x00122200, 0x00022208, 0x00122208,
+            0x04022000, 0x04122000, 0x04022008, 0x04122008,
+            0x04022200, 0x04122200, 0x04022208, 0x04122208,
+            0x04022000, 0x04122000, 0x04022008, 0x04122008,
+            0x04022200, 0x04122200, 0x04022208, 0x04122208
+        );
+        static $pc2mapd1 = array(
+            0x00000000, 0x00000001, 0x08000000, 0x08000001,
+            0x00200000, 0x00200001, 0x08200000, 0x08200001,
+            0x00000002, 0x00000003, 0x08000002, 0x08000003,
+            0x00200002, 0x00200003, 0x08200002, 0x08200003
+        );
+        static $pc2mapd2 = array(
+            0x00000000, 0x00100000, 0x00000800, 0x00100800,
+            0x00000000, 0x00100000, 0x00000800, 0x00100800,
+            0x04000000, 0x04100000, 0x04000800, 0x04100800,
+            0x04000000, 0x04100000, 0x04000800, 0x04100800,
+            0x00000004, 0x00100004, 0x00000804, 0x00100804,
+            0x00000004, 0x00100004, 0x00000804, 0x00100804,
+            0x04000004, 0x04100004, 0x04000804, 0x04100804,
+            0x04000004, 0x04100004, 0x04000804, 0x04100804,
+            0x00000000, 0x00100000, 0x00000800, 0x00100800,
+            0x00000000, 0x00100000, 0x00000800, 0x00100800,
+            0x04000000, 0x04100000, 0x04000800, 0x04100800,
+            0x04000000, 0x04100000, 0x04000800, 0x04100800,
+            0x00000004, 0x00100004, 0x00000804, 0x00100804,
+            0x00000004, 0x00100004, 0x00000804, 0x00100804,
+            0x04000004, 0x04100004, 0x04000804, 0x04100804,
+            0x04000004, 0x04100004, 0x04000804, 0x04100804,
+            0x00000200, 0x00100200, 0x00000A00, 0x00100A00,
+            0x00000200, 0x00100200, 0x00000A00, 0x00100A00,
+            0x04000200, 0x04100200, 0x04000A00, 0x04100A00,
+            0x04000200, 0x04100200, 0x04000A00, 0x04100A00,
+            0x00000204, 0x00100204, 0x00000A04, 0x00100A04,
+            0x00000204, 0x00100204, 0x00000A04, 0x00100A04,
+            0x04000204, 0x04100204, 0x04000A04, 0x04100A04,
+            0x04000204, 0x04100204, 0x04000A04, 0x04100A04,
+            0x00000200, 0x00100200, 0x00000A00, 0x00100A00,
+            0x00000200, 0x00100200, 0x00000A00, 0x00100A00,
+            0x04000200, 0x04100200, 0x04000A00, 0x04100A00,
+            0x04000200, 0x04100200, 0x04000A00, 0x04100A00,
+            0x00000204, 0x00100204, 0x00000A04, 0x00100A04,
+            0x00000204, 0x00100204, 0x00000A04, 0x00100A04,
+            0x04000204, 0x04100204, 0x04000A04, 0x04100A04,
+            0x04000204, 0x04100204, 0x04000A04, 0x04100A04,
+            0x00020000, 0x00120000, 0x00020800, 0x00120800,
+            0x00020000, 0x00120000, 0x00020800, 0x00120800,
+            0x04020000, 0x04120000, 0x04020800, 0x04120800,
+            0x04020000, 0x04120000, 0x04020800, 0x04120800,
+            0x00020004, 0x00120004, 0x00020804, 0x00120804,
+            0x00020004, 0x00120004, 0x00020804, 0x00120804,
+            0x04020004, 0x04120004, 0x04020804, 0x04120804,
+            0x04020004, 0x04120004, 0x04020804, 0x04120804,
+            0x00020000, 0x00120000, 0x00020800, 0x00120800,
+            0x00020000, 0x00120000, 0x00020800, 0x00120800,
+            0x04020000, 0x04120000, 0x04020800, 0x04120800,
+            0x04020000, 0x04120000, 0x04020800, 0x04120800,
+            0x00020004, 0x00120004, 0x00020804, 0x00120804,
+            0x00020004, 0x00120004, 0x00020804, 0x00120804,
+            0x04020004, 0x04120004, 0x04020804, 0x04120804,
+            0x04020004, 0x04120004, 0x04020804, 0x04120804,
+            0x00020200, 0x00120200, 0x00020A00, 0x00120A00,
+            0x00020200, 0x00120200, 0x00020A00, 0x00120A00,
+            0x04020200, 0x04120200, 0x04020A00, 0x04120A00,
+            0x04020200, 0x04120200, 0x04020A00, 0x04120A00,
+            0x00020204, 0x00120204, 0x00020A04, 0x00120A04,
+            0x00020204, 0x00120204, 0x00020A04, 0x00120A04,
+            0x04020204, 0x04120204, 0x04020A04, 0x04120A04,
+            0x04020204, 0x04120204, 0x04020A04, 0x04120A04,
+            0x00020200, 0x00120200, 0x00020A00, 0x00120A00,
+            0x00020200, 0x00120200, 0x00020A00, 0x00120A00,
+            0x04020200, 0x04120200, 0x04020A00, 0x04120A00,
+            0x04020200, 0x04120200, 0x04020A00, 0x04120A00,
+            0x00020204, 0x00120204, 0x00020A04, 0x00120A04,
+            0x00020204, 0x00120204, 0x00020A04, 0x00120A04,
+            0x04020204, 0x04120204, 0x04020A04, 0x04120A04,
+            0x04020204, 0x04120204, 0x04020A04, 0x04120A04
+        );
+        static $pc2mapd3 = array(
+            0x00000000, 0x00010000, 0x02000000, 0x02010000,
+            0x00000020, 0x00010020, 0x02000020, 0x02010020,
+            0x00040000, 0x00050000, 0x02040000, 0x02050000,
+            0x00040020, 0x00050020, 0x02040020, 0x02050020,
+            0x00002000, 0x00012000, 0x02002000, 0x02012000,
+            0x00002020, 0x00012020, 0x02002020, 0x02012020,
+            0x00042000, 0x00052000, 0x02042000, 0x02052000,
+            0x00042020, 0x00052020, 0x02042020, 0x02052020,
+            0x00000000, 0x00010000, 0x02000000, 0x02010000,
+            0x00000020, 0x00010020, 0x02000020, 0x02010020,
+            0x00040000, 0x00050000, 0x02040000, 0x02050000,
+            0x00040020, 0x00050020, 0x02040020, 0x02050020,
+            0x00002000, 0x00012000, 0x02002000, 0x02012000,
+            0x00002020, 0x00012020, 0x02002020, 0x02012020,
+            0x00042000, 0x00052000, 0x02042000, 0x02052000,
+            0x00042020, 0x00052020, 0x02042020, 0x02052020,
+            0x00000010, 0x00010010, 0x02000010, 0x02010010,
+            0x00000030, 0x00010030, 0x02000030, 0x02010030,
+            0x00040010, 0x00050010, 0x02040010, 0x02050010,
+            0x00040030, 0x00050030, 0x02040030, 0x02050030,
+            0x00002010, 0x00012010, 0x02002010, 0x02012010,
+            0x00002030, 0x00012030, 0x02002030, 0x02012030,
+            0x00042010, 0x00052010, 0x02042010, 0x02052010,
+            0x00042030, 0x00052030, 0x02042030, 0x02052030,
+            0x00000010, 0x00010010, 0x02000010, 0x02010010,
+            0x00000030, 0x00010030, 0x02000030, 0x02010030,
+            0x00040010, 0x00050010, 0x02040010, 0x02050010,
+            0x00040030, 0x00050030, 0x02040030, 0x02050030,
+            0x00002010, 0x00012010, 0x02002010, 0x02012010,
+            0x00002030, 0x00012030, 0x02002030, 0x02012030,
+            0x00042010, 0x00052010, 0x02042010, 0x02052010,
+            0x00042030, 0x00052030, 0x02042030, 0x02052030,
+            0x20000000, 0x20010000, 0x22000000, 0x22010000,
+            0x20000020, 0x20010020, 0x22000020, 0x22010020,
+            0x20040000, 0x20050000, 0x22040000, 0x22050000,
+            0x20040020, 0x20050020, 0x22040020, 0x22050020,
+            0x20002000, 0x20012000, 0x22002000, 0x22012000,
+            0x20002020, 0x20012020, 0x22002020, 0x22012020,
+            0x20042000, 0x20052000, 0x22042000, 0x22052000,
+            0x20042020, 0x20052020, 0x22042020, 0x22052020,
+            0x20000000, 0x20010000, 0x22000000, 0x22010000,
+            0x20000020, 0x20010020, 0x22000020, 0x22010020,
+            0x20040000, 0x20050000, 0x22040000, 0x22050000,
+            0x20040020, 0x20050020, 0x22040020, 0x22050020,
+            0x20002000, 0x20012000, 0x22002000, 0x22012000,
+            0x20002020, 0x20012020, 0x22002020, 0x22012020,
+            0x20042000, 0x20052000, 0x22042000, 0x22052000,
+            0x20042020, 0x20052020, 0x22042020, 0x22052020,
+            0x20000010, 0x20010010, 0x22000010, 0x22010010,
+            0x20000030, 0x20010030, 0x22000030, 0x22010030,
+            0x20040010, 0x20050010, 0x22040010, 0x22050010,
+            0x20040030, 0x20050030, 0x22040030, 0x22050030,
+            0x20002010, 0x20012010, 0x22002010, 0x22012010,
+            0x20002030, 0x20012030, 0x22002030, 0x22012030,
+            0x20042010, 0x20052010, 0x22042010, 0x22052010,
+            0x20042030, 0x20052030, 0x22042030, 0x22052030,
+            0x20000010, 0x20010010, 0x22000010, 0x22010010,
+            0x20000030, 0x20010030, 0x22000030, 0x22010030,
+            0x20040010, 0x20050010, 0x22040010, 0x22050010,
+            0x20040030, 0x20050030, 0x22040030, 0x22050030,
+            0x20002010, 0x20012010, 0x22002010, 0x22012010,
+            0x20002030, 0x20012030, 0x22002030, 0x22012030,
+            0x20042010, 0x20052010, 0x22042010, 0x22052010,
+            0x20042030, 0x20052030, 0x22042030, 0x22052030
+        );
+        static $pc2mapd4 = array(
+            0x00000000, 0x00000400, 0x01000000, 0x01000400,
+            0x00000000, 0x00000400, 0x01000000, 0x01000400,
+            0x00000100, 0x00000500, 0x01000100, 0x01000500,
+            0x00000100, 0x00000500, 0x01000100, 0x01000500,
+            0x10000000, 0x10000400, 0x11000000, 0x11000400,
+            0x10000000, 0x10000400, 0x11000000, 0x11000400,
+            0x10000100, 0x10000500, 0x11000100, 0x11000500,
+            0x10000100, 0x10000500, 0x11000100, 0x11000500,
+            0x00080000, 0x00080400, 0x01080000, 0x01080400,
+            0x00080000, 0x00080400, 0x01080000, 0x01080400,
+            0x00080100, 0x00080500, 0x01080100, 0x01080500,
+            0x00080100, 0x00080500, 0x01080100, 0x01080500,
+            0x10080000, 0x10080400, 0x11080000, 0x11080400,
+            0x10080000, 0x10080400, 0x11080000, 0x11080400,
+            0x10080100, 0x10080500, 0x11080100, 0x11080500,
+            0x10080100, 0x10080500, 0x11080100, 0x11080500,
+            0x00000008, 0x00000408, 0x01000008, 0x01000408,
+            0x00000008, 0x00000408, 0x01000008, 0x01000408,
+            0x00000108, 0x00000508, 0x01000108, 0x01000508,
+            0x00000108, 0x00000508, 0x01000108, 0x01000508,
+            0x10000008, 0x10000408, 0x11000008, 0x11000408,
+            0x10000008, 0x10000408, 0x11000008, 0x11000408,
+            0x10000108, 0x10000508, 0x11000108, 0x11000508,
+            0x10000108, 0x10000508, 0x11000108, 0x11000508,
+            0x00080008, 0x00080408, 0x01080008, 0x01080408,
+            0x00080008, 0x00080408, 0x01080008, 0x01080408,
+            0x00080108, 0x00080508, 0x01080108, 0x01080508,
+            0x00080108, 0x00080508, 0x01080108, 0x01080508,
+            0x10080008, 0x10080408, 0x11080008, 0x11080408,
+            0x10080008, 0x10080408, 0x11080008, 0x11080408,
+            0x10080108, 0x10080508, 0x11080108, 0x11080508,
+            0x10080108, 0x10080508, 0x11080108, 0x11080508,
+            0x00001000, 0x00001400, 0x01001000, 0x01001400,
+            0x00001000, 0x00001400, 0x01001000, 0x01001400,
+            0x00001100, 0x00001500, 0x01001100, 0x01001500,
+            0x00001100, 0x00001500, 0x01001100, 0x01001500,
+            0x10001000, 0x10001400, 0x11001000, 0x11001400,
+            0x10001000, 0x10001400, 0x11001000, 0x11001400,
+            0x10001100, 0x10001500, 0x11001100, 0x11001500,
+            0x10001100, 0x10001500, 0x11001100, 0x11001500,
+            0x00081000, 0x00081400, 0x01081000, 0x01081400,
+            0x00081000, 0x00081400, 0x01081000, 0x01081400,
+            0x00081100, 0x00081500, 0x01081100, 0x01081500,
+            0x00081100, 0x00081500, 0x01081100, 0x01081500,
+            0x10081000, 0x10081400, 0x11081000, 0x11081400,
+            0x10081000, 0x10081400, 0x11081000, 0x11081400,
+            0x10081100, 0x10081500, 0x11081100, 0x11081500,
+            0x10081100, 0x10081500, 0x11081100, 0x11081500,
+            0x00001008, 0x00001408, 0x01001008, 0x01001408,
+            0x00001008, 0x00001408, 0x01001008, 0x01001408,
+            0x00001108, 0x00001508, 0x01001108, 0x01001508,
+            0x00001108, 0x00001508, 0x01001108, 0x01001508,
+            0x10001008, 0x10001408, 0x11001008, 0x11001408,
+            0x10001008, 0x10001408, 0x11001008, 0x11001408,
+            0x10001108, 0x10001508, 0x11001108, 0x11001508,
+            0x10001108, 0x10001508, 0x11001108, 0x11001508,
+            0x00081008, 0x00081408, 0x01081008, 0x01081408,
+            0x00081008, 0x00081408, 0x01081008, 0x01081408,
+            0x00081108, 0x00081508, 0x01081108, 0x01081508,
+            0x00081108, 0x00081508, 0x01081108, 0x01081508,
+            0x10081008, 0x10081408, 0x11081008, 0x11081408,
+            0x10081008, 0x10081408, 0x11081008, 0x11081408,
+            0x10081108, 0x10081508, 0x11081108, 0x11081508,
+            0x10081108, 0x10081508, 0x11081108, 0x11081508
+        );
+
+        $keys = array();
+        for ($des_round = 0; $des_round < $this->des_rounds; ++$des_round) {
+            // pad the key and remove extra characters as appropriate.
+            $key = str_pad(substr($this->key, $des_round * 8, 8), 8, "\0");
+
+            // Perform the PC/1 transformation and compute C and D.
+            $t = unpack('Nl/Nr', $key);
+            list($l, $r) = array($t['l'], $t['r']);
+            $key = ($this->shuffle[$pc1map[ $r        & 0xFF]] & "\x80\x80\x80\x80\x80\x80\x80\x00") |
+                   ($this->shuffle[$pc1map[($r >>  8) & 0xFF]] & "\x40\x40\x40\x40\x40\x40\x40\x00") |
+                   ($this->shuffle[$pc1map[($r >> 16) & 0xFF]] & "\x20\x20\x20\x20\x20\x20\x20\x00") |
+                   ($this->shuffle[$pc1map[($r >> 24) & 0xFF]] & "\x10\x10\x10\x10\x10\x10\x10\x00") |
+                   ($this->shuffle[$pc1map[ $l        & 0xFF]] & "\x08\x08\x08\x08\x08\x08\x08\x00") |
+                   ($this->shuffle[$pc1map[($l >>  8) & 0xFF]] & "\x04\x04\x04\x04\x04\x04\x04\x00") |
+                   ($this->shuffle[$pc1map[($l >> 16) & 0xFF]] & "\x02\x02\x02\x02\x02\x02\x02\x00") |
+                   ($this->shuffle[$pc1map[($l >> 24) & 0xFF]] & "\x01\x01\x01\x01\x01\x01\x01\x00");
+            $key = unpack('Nc/Nd', $key);
+            $c = ( $key['c'] >> 4) & 0x0FFFFFFF;
+            $d = (($key['d'] >> 4) & 0x0FFFFFF0) | ($key['c'] & 0x0F);
+
+            $keys[$des_round] = array(
+                CRYPT_DES_ENCRYPT => array(),
+                CRYPT_DES_DECRYPT => array_fill(0, 32, 0)
+            );
+            for ($i = 0, $ki = 31; $i < 16; ++$i, $ki-= 2) {
+                $c <<= $shifts[$i];
+                $c = ($c | ($c >> 28)) & 0x0FFFFFFF;
+                $d <<= $shifts[$i];
+                $d = ($d | ($d >> 28)) & 0x0FFFFFFF;
+
+                // Perform the PC-2 transformation.
+                $cp = $pc2mapc1[ $c >> 24        ] | $pc2mapc2[($c >> 16) & 0xFF] |
+                      $pc2mapc3[($c >>  8) & 0xFF] | $pc2mapc4[ $c        & 0xFF];
+                $dp = $pc2mapd1[ $d >> 24        ] | $pc2mapd2[($d >> 16) & 0xFF] |
+                      $pc2mapd3[($d >>  8) & 0xFF] | $pc2mapd4[ $d        & 0xFF];
+
+                // Reorder: odd bytes/even bytes. Push the result in key schedule.
+                $val1 = ( $cp        & 0xFF000000) | (($cp <<  8) & 0x00FF0000) |
+                        (($dp >> 16) & 0x0000FF00) | (($dp >>  8) & 0x000000FF);
+                $val2 = (($cp <<  8) & 0xFF000000) | (($cp << 16) & 0x00FF0000) |
+                        (($dp >>  8) & 0x0000FF00) | ( $dp        & 0x000000FF);
+                $keys[$des_round][CRYPT_DES_ENCRYPT][       ] = $val1;
+                $keys[$des_round][CRYPT_DES_DECRYPT][$ki - 1] = $val1;
+                $keys[$des_round][CRYPT_DES_ENCRYPT][       ] = $val2;
+                $keys[$des_round][CRYPT_DES_DECRYPT][$ki    ] = $val2;
+            }
+        }
+
+        switch ($this->des_rounds) {
+            case 3: // 3DES keys
+                $this->keys = array(
+                    CRYPT_DES_ENCRYPT => array_merge(
+                        $keys[0][CRYPT_DES_ENCRYPT],
+                        $keys[1][CRYPT_DES_DECRYPT],
+                        $keys[2][CRYPT_DES_ENCRYPT]
+                    ),
+                    CRYPT_DES_DECRYPT => array_merge(
+                        $keys[2][CRYPT_DES_DECRYPT],
+                        $keys[1][CRYPT_DES_ENCRYPT],
+                        $keys[0][CRYPT_DES_DECRYPT]
+                    )
+                );
+                break;
+            // case 1: // DES keys
+            default:
+                $this->keys = array(
+                    CRYPT_DES_ENCRYPT => $keys[0][CRYPT_DES_ENCRYPT],
+                    CRYPT_DES_DECRYPT => $keys[0][CRYPT_DES_DECRYPT]
+                );
+        }
+    }
+
+    /**
+     * Setup the performance-optimized function for de/encrypt()
+     *
+     * @see Crypt_Base::_setupInlineCrypt()
+     * @access private
+     */
+    function _setupInlineCrypt()
+    {
+        $lambda_functions =& Crypt_DES::_getLambdaFunctions();
+
+        // Engine configuration for:
+        // -  DES ($des_rounds == 1) or
+        // - 3DES ($des_rounds == 3)
+        $des_rounds = $this->des_rounds;
+
+        // We create max. 10 hi-optimized code for memory reason. Means: For each $key one ultra fast inline-crypt function.
+        // (Currently, for Crypt_DES,       one generated $lambda_function cost on php5.5@32bit ~135kb unfreeable mem and ~230kb on php5.5@64bit)
+        // (Currently, for Crypt_TripleDES, one generated $lambda_function cost on php5.5@32bit ~240kb unfreeable mem and ~340kb on php5.5@64bit)
+        // After that, we'll still create very fast optimized code but not the hi-ultimative code, for each $mode one
+        $gen_hi_opt_code = (bool)( count($lambda_functions) < 10 );
+
+        // Generation of a unique hash for our generated code
+        $code_hash = "Crypt_DES, $des_rounds, {$this->mode}";
+        if ($gen_hi_opt_code) {
+            // For hi-optimized code, we create for each combination of
+            // $mode, $des_rounds and $this->key its own encrypt/decrypt function.
+            // After max 10 hi-optimized functions, we create generic
+            // (still very fast.. but not ultra) functions for each $mode/$des_rounds
+            // Currently 2 * 5 generic functions will be then max. possible.
+            $code_hash = str_pad($code_hash, 32) . $this->_hashInlineCryptFunction($this->key);
+        }
+
+        // Is there a re-usable $lambda_functions in there? If not, we have to create it.
+        if (!isset($lambda_functions[$code_hash])) {
+            // Init code for both, encrypt and decrypt.
+            $init_crypt = 'static $sbox1, $sbox2, $sbox3, $sbox4, $sbox5, $sbox6, $sbox7, $sbox8, $shuffleip, $shuffleinvip;
+                if (!$sbox1) {
+                    $sbox1 = array_map("intval", $self->sbox1);
+                    $sbox2 = array_map("intval", $self->sbox2);
+                    $sbox3 = array_map("intval", $self->sbox3);
+                    $sbox4 = array_map("intval", $self->sbox4);
+                    $sbox5 = array_map("intval", $self->sbox5);
+                    $sbox6 = array_map("intval", $self->sbox6);
+                    $sbox7 = array_map("intval", $self->sbox7);
+                    $sbox8 = array_map("intval", $self->sbox8);'
+                    /* Merge $shuffle with $[inv]ipmap */ . '
+                    for ($i = 0; $i < 256; ++$i) {
+                        $shuffleip[]    =  $self->shuffle[$self->ipmap[$i]];
+                        $shuffleinvip[] =  $self->shuffle[$self->invipmap[$i]];
+                    }
+                }
+            ';
+
+            switch (true) {
+                case $gen_hi_opt_code:
+                    // In Hi-optimized code mode, we use our [3]DES key schedule as hardcoded integers.
+                    // No futher initialisation of the $keys schedule is necessary.
+                    // That is the extra performance boost.
+                    $k = array(
+                        CRYPT_DES_ENCRYPT => $this->keys[CRYPT_DES_ENCRYPT],
+                        CRYPT_DES_DECRYPT => $this->keys[CRYPT_DES_DECRYPT]
+                    );
+                    $init_encrypt = '';
+                    $init_decrypt = '';
+                    break;
+                default:
+                    // In generic optimized code mode, we have to use, as the best compromise [currently],
+                    // our key schedule as $ke/$kd arrays. (with hardcoded indexes...)
+                    $k = array(
+                        CRYPT_DES_ENCRYPT => array(),
+                        CRYPT_DES_DECRYPT => array()
+                    );
+                    for ($i = 0, $c = count($this->keys[CRYPT_DES_ENCRYPT]); $i < $c; ++$i) {
+                        $k[CRYPT_DES_ENCRYPT][$i] = '$ke[' . $i . ']';
+                        $k[CRYPT_DES_DECRYPT][$i] = '$kd[' . $i . ']';
+                    }
+                    $init_encrypt = '$ke = $self->keys[CRYPT_DES_ENCRYPT];';
+                    $init_decrypt = '$kd = $self->keys[CRYPT_DES_DECRYPT];';
+                    break;
+            }
+
+            // Creating code for en- and decryption.
+            $crypt_block = array();
+            foreach (array(CRYPT_DES_ENCRYPT, CRYPT_DES_DECRYPT) as $c) {
+                /* Do the initial IP permutation. */
+                $crypt_block[$c] = '
+                    $in = unpack("N*", $in);
+                    $l  = $in[1];
+                    $r  = $in[2];
+                    $in = unpack("N*",
+                        ($shuffleip[ $r        & 0xFF] & "\x80\x80\x80\x80\x80\x80\x80\x80") |
+                        ($shuffleip[($r >>  8) & 0xFF] & "\x40\x40\x40\x40\x40\x40\x40\x40") |
+                        ($shuffleip[($r >> 16) & 0xFF] & "\x20\x20\x20\x20\x20\x20\x20\x20") |
+                        ($shuffleip[($r >> 24) & 0xFF] & "\x10\x10\x10\x10\x10\x10\x10\x10") |
+                        ($shuffleip[ $l        & 0xFF] & "\x08\x08\x08\x08\x08\x08\x08\x08") |
+                        ($shuffleip[($l >>  8) & 0xFF] & "\x04\x04\x04\x04\x04\x04\x04\x04") |
+                        ($shuffleip[($l >> 16) & 0xFF] & "\x02\x02\x02\x02\x02\x02\x02\x02") |
+                        ($shuffleip[($l >> 24) & 0xFF] & "\x01\x01\x01\x01\x01\x01\x01\x01")
+                    );
+                    ' . /* Extract L0 and R0 */ '
+                    $l = $in[1];
+                    $r = $in[2];
+                ';
+
+                $l = '$l';
+                $r = '$r';
+
+                // Perform DES or 3DES.
+                for ($ki = -1, $des_round = 0; $des_round < $des_rounds; ++$des_round) {
+                    // Perform the 16 steps.
+                    for ($i = 0; $i < 16; ++$i) {
+                        // start of "the Feistel (F) function" - see the following URL:
+                        // http://en.wikipedia.org/wiki/Image:Data_Encryption_Standard_InfoBox_Diagram.png
+                        // Merge key schedule.
+                        $crypt_block[$c].= '
+                            $b1 = ((' . $r . ' >>  3) & 0x1FFFFFFF)  ^ (' . $r . ' << 29) ^ ' . $k[$c][++$ki] . ';
+                            $b2 = ((' . $r . ' >> 31) & 0x00000001)  ^ (' . $r . ' <<  1) ^ ' . $k[$c][++$ki] . ';' .
+                            /* S-box indexing. */
+                            $l . ' = $sbox1[($b1 >> 24) & 0x3F] ^ $sbox2[($b2 >> 24) & 0x3F] ^
+                                     $sbox3[($b1 >> 16) & 0x3F] ^ $sbox4[($b2 >> 16) & 0x3F] ^
+                                     $sbox5[($b1 >>  8) & 0x3F] ^ $sbox6[($b2 >>  8) & 0x3F] ^
+                                     $sbox7[ $b1        & 0x3F] ^ $sbox8[ $b2        & 0x3F] ^ ' . $l . ';
+                        ';
+                        // end of "the Feistel (F) function"
+
+                        // swap L & R
+                        list($l, $r) = array($r, $l);
+                    }
+                    list($l, $r) = array($r, $l);
+                }
+
+                // Perform the inverse IP permutation.
+                $crypt_block[$c].= '$in =
+                    ($shuffleinvip[($l >> 24) & 0xFF] & "\x80\x80\x80\x80\x80\x80\x80\x80") |
+                    ($shuffleinvip[($r >> 24) & 0xFF] & "\x40\x40\x40\x40\x40\x40\x40\x40") |
+                    ($shuffleinvip[($l >> 16) & 0xFF] & "\x20\x20\x20\x20\x20\x20\x20\x20") |
+                    ($shuffleinvip[($r >> 16) & 0xFF] & "\x10\x10\x10\x10\x10\x10\x10\x10") |
+                    ($shuffleinvip[($l >>  8) & 0xFF] & "\x08\x08\x08\x08\x08\x08\x08\x08") |
+                    ($shuffleinvip[($r >>  8) & 0xFF] & "\x04\x04\x04\x04\x04\x04\x04\x04") |
+                    ($shuffleinvip[ $l        & 0xFF] & "\x02\x02\x02\x02\x02\x02\x02\x02") |
+                    ($shuffleinvip[ $r        & 0xFF] & "\x01\x01\x01\x01\x01\x01\x01\x01");
+                ';
+            }
+
+            // Creates the inline-crypt function
+            $lambda_functions[$code_hash] = $this->_createInlineCryptFunction(
+                array(
+                   'init_crypt'    => $init_crypt,
+                   'init_encrypt'  => $init_encrypt,
+                   'init_decrypt'  => $init_decrypt,
+                   'encrypt_block' => $crypt_block[CRYPT_DES_ENCRYPT],
+                   'decrypt_block' => $crypt_block[CRYPT_DES_DECRYPT]
+                )
+            );
+        }
+
+        // Set the inline-crypt function as callback in: $this->inline_crypt
+        $this->inline_crypt = $lambda_functions[$code_hash];
+    }
+}
diff --git a/lib/php/phpseclib/Crypt/Hash.php b/lib/php/phpseclib/Crypt/Hash.php
new file mode 100644
index 00000000..ca56ac73
--- /dev/null
+++ b/lib/php/phpseclib/Crypt/Hash.php
@@ -0,0 +1,922 @@
+<?php
+
+/**
+ * Pure-PHP implementations of keyed-hash message authentication codes (HMACs) and various cryptographic hashing functions.
+ *
+ * Uses hash() or mhash() if available and an internal implementation, otherwise.  Currently supports the following:
+ *
+ * md2, md5, md5-96, sha1, sha1-96, sha256, sha256-96, sha384, and sha512, sha512-96
+ *
+ * If {@link self::setKey() setKey()} is called, {@link self::hash() hash()} will return the HMAC as opposed to
+ * the hash.  If no valid algorithm is provided, sha1 will be used.
+ *
+ * PHP versions 4 and 5
+ *
+ * {@internal The variable names are the same as those in
+ * {@link http://tools.ietf.org/html/rfc2104#section-2 RFC2104}.}}
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ *    include 'Crypt/Hash.php';
+ *
+ *    $hash = new Crypt_Hash('sha1');
+ *
+ *    $hash->setKey('abcdefg');
+ *
+ *    echo base64_encode($hash->hash('abcdefg'));
+ * ?>
+ * </code>
+ *
+ * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @category  Crypt
+ * @package   Crypt_Hash
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2007 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+/**#@+
+ * @access private
+ * @see self::Crypt_Hash()
+ */
+/**
+ * Toggles the internal implementation
+ */
+define('CRYPT_HASH_MODE_INTERNAL', 1);
+/**
+ * Toggles the mhash() implementation, which has been deprecated on PHP 5.3.0+.
+ */
+define('CRYPT_HASH_MODE_MHASH',    2);
+/**
+ * Toggles the hash() implementation, which works on PHP 5.1.2+.
+ */
+define('CRYPT_HASH_MODE_HASH',     3);
+/**#@-*/
+
+/**
+ * Pure-PHP implementations of keyed-hash message authentication codes (HMACs) and various cryptographic hashing functions.
+ *
+ * @package Crypt_Hash
+ * @author  Jim Wigginton <terrafrost@php.net>
+ * @access  public
+ */
+class Crypt_Hash
+{
+    /**
+     * Hash Parameter
+     *
+     * @see self::setHash()
+     * @var int
+     * @access private
+     */
+    var $hashParam;
+
+    /**
+     * Byte-length of compression blocks / key (Internal HMAC)
+     *
+     * @see self::setAlgorithm()
+     * @var int
+     * @access private
+     */
+    var $b;
+
+    /**
+     * Byte-length of hash output (Internal HMAC)
+     *
+     * @see self::setHash()
+     * @var int
+     * @access private
+     */
+    var $l = false;
+
+    /**
+     * Hash Algorithm
+     *
+     * @see self::setHash()
+     * @var string
+     * @access private
+     */
+    var $hash;
+
+    /**
+     * Key
+     *
+     * @see self::setKey()
+     * @var string
+     * @access private
+     */
+    var $key = false;
+
+    /**
+     * Computed Key
+     *
+     * @see self::_computeKey()
+     * @var string
+     * @access private
+     */
+    var $computedKey = false;
+
+    /**
+     * Outer XOR (Internal HMAC)
+     *
+     * @see self::setKey()
+     * @var string
+     * @access private
+     */
+    var $opad;
+
+    /**
+     * Inner XOR (Internal HMAC)
+     *
+     * @see self::setKey()
+     * @var string
+     * @access private
+     */
+    var $ipad;
+
+    /**
+     * Default Constructor.
+     *
+     * @param string $hash
+     * @return Crypt_Hash
+     * @access public
+     */
+    function __construct($hash = 'sha1')
+    {
+        if (!defined('CRYPT_HASH_MODE')) {
+            switch (true) {
+                case extension_loaded('hash'):
+                    define('CRYPT_HASH_MODE', CRYPT_HASH_MODE_HASH);
+                    break;
+                case extension_loaded('mhash'):
+                    define('CRYPT_HASH_MODE', CRYPT_HASH_MODE_MHASH);
+                    break;
+                default:
+                    define('CRYPT_HASH_MODE', CRYPT_HASH_MODE_INTERNAL);
+            }
+        }
+
+        $this->setHash($hash);
+    }
+
+    /**
+     * PHP4 compatible Default Constructor.
+     *
+     * @see self::__construct()
+     * @param int $mode
+     * @access public
+     */
+    function Crypt_Hash($hash = 'sha1')
+    {
+        $this->__construct($hash);
+    }
+
+    /**
+     * Sets the key for HMACs
+     *
+     * Keys can be of any length.
+     *
+     * @access public
+     * @param string $key
+     */
+    function setKey($key = false)
+    {
+        $this->key = $key;
+        $this->_computeKey();
+    }
+
+    /**
+     * Pre-compute the key used by the HMAC
+     *
+     * Quoting http://tools.ietf.org/html/rfc2104#section-2, "Applications that use keys longer than B bytes
+     * will first hash the key using H and then use the resultant L byte string as the actual key to HMAC."
+     *
+     * As documented in https://www.reddit.com/r/PHP/comments/9nct2l/symfonypolyfill_hash_pbkdf2_correct_fix_for/
+     * when doing an HMAC multiple times it's faster to compute the hash once instead of computing it during
+     * every call
+     *
+     * @access private
+     */
+    function _computeKey()
+    {
+        if ($this->key === false) {
+            $this->computedKey = false;
+            return;
+        }
+
+        if (strlen($this->key) <= $this->b) {
+            $this->computedKey = $this->key;
+            return;
+        }
+
+        switch ($mode) {
+            case CRYPT_HASH_MODE_MHASH:
+                $this->computedKey = mhash($this->hash, $this->key);
+                break;
+            case CRYPT_HASH_MODE_HASH:
+                $this->computedKey = hash($this->hash, $this->key, true);
+                break;
+            case CRYPT_HASH_MODE_INTERNAL:
+                $this->computedKey = call_user_func($this->hash, $this->key);
+        }
+    }
+
+    /**
+     * Gets the hash function.
+     *
+     * As set by the constructor or by the setHash() method.
+     *
+     * @access public
+     * @return string
+     */
+    function getHash()
+    {
+        return $this->hashParam;
+    }
+
+    /**
+     * Sets the hash function.
+     *
+     * @access public
+     * @param string $hash
+     */
+    function setHash($hash)
+    {
+        $this->hashParam = $hash = strtolower($hash);
+        switch ($hash) {
+            case 'md5-96':
+            case 'sha1-96':
+            case 'sha256-96':
+            case 'sha512-96':
+                $hash = substr($hash, 0, -3);
+                $this->l = 12; // 96 / 8 = 12
+                break;
+            case 'md2':
+            case 'md5':
+                $this->l = 16;
+                break;
+            case 'sha1':
+                $this->l = 20;
+                break;
+            case 'sha256':
+                $this->l = 32;
+                break;
+            case 'sha384':
+                $this->l = 48;
+                break;
+            case 'sha512':
+                $this->l = 64;
+        }
+
+        switch ($hash) {
+            case 'md2-96':
+            case 'md2':
+                $this->b = 16;
+            case 'md5-96':
+            case 'sha1-96':
+            case 'sha224-96':
+            case 'sha256-96':
+            case 'md2':
+            case 'md5':
+            case 'sha1':
+            case 'sha224':
+            case 'sha256':
+                $this->b = 64;
+                break;
+            default:
+                $this->b = 128;
+        }
+
+        switch ($hash) {
+            case 'md2':
+                $mode = CRYPT_HASH_MODE == CRYPT_HASH_MODE_HASH && in_array('md2', hash_algos()) ?
+                    CRYPT_HASH_MODE_HASH : CRYPT_HASH_MODE_INTERNAL;
+                break;
+            case 'sha384':
+            case 'sha512':
+                $mode = CRYPT_HASH_MODE == CRYPT_HASH_MODE_MHASH ? CRYPT_HASH_MODE_INTERNAL : CRYPT_HASH_MODE;
+                break;
+            default:
+                $mode = CRYPT_HASH_MODE;
+        }
+
+        switch ($mode) {
+            case CRYPT_HASH_MODE_MHASH:
+                switch ($hash) {
+                    case 'md5':
+                        $this->hash = MHASH_MD5;
+                        break;
+                    case 'sha256':
+                        $this->hash = MHASH_SHA256;
+                        break;
+                    case 'sha1':
+                    default:
+                        $this->hash = MHASH_SHA1;
+                }
+                $this->_computeKey();
+                return;
+            case CRYPT_HASH_MODE_HASH:
+                switch ($hash) {
+                    case 'md5':
+                        $this->hash = 'md5';
+                        return;
+                    case 'md2':
+                    case 'sha256':
+                    case 'sha384':
+                    case 'sha512':
+                        $this->hash = $hash;
+                        return;
+                    case 'sha1':
+                    default:
+                        $this->hash = 'sha1';
+                }
+                $this->_computeKey();
+                return;
+        }
+
+        switch ($hash) {
+            case 'md2':
+                $this->hash = array($this, '_md2');
+                break;
+            case 'md5':
+                $this->hash = array($this, '_md5');
+                break;
+            case 'sha256':
+                $this->hash = array($this, '_sha256');
+                break;
+            case 'sha384':
+            case 'sha512':
+                $this->hash = array($this, '_sha512');
+                break;
+            case 'sha1':
+            default:
+                $this->hash = array($this, '_sha1');
+        }
+
+        $this->ipad = str_repeat(chr(0x36), $this->b);
+        $this->opad = str_repeat(chr(0x5C), $this->b);
+
+        $this->_computeKey();
+    }
+
+    /**
+     * Compute the HMAC.
+     *
+     * @access public
+     * @param string $text
+     * @return string
+     */
+    function hash($text)
+    {
+        $mode = is_array($this->hash) ? CRYPT_HASH_MODE_INTERNAL : CRYPT_HASH_MODE;
+
+        if (!empty($this->key) || is_string($this->key)) {
+            switch ($mode) {
+                case CRYPT_HASH_MODE_MHASH:
+                    $output = mhash($this->hash, $text, $this->computedKey);
+                    break;
+                case CRYPT_HASH_MODE_HASH:
+                    $output = hash_hmac($this->hash, $text, $this->computedKey, true);
+                    break;
+                case CRYPT_HASH_MODE_INTERNAL:
+                    $key    = str_pad($this->computedKey, $this->b, chr(0)); // step 1
+                    $temp   = $this->ipad ^ $key;                            // step 2
+                    $temp  .= $text;                                         // step 3
+                    $temp   = call_user_func($this->hash, $temp);            // step 4
+                    $output = $this->opad ^ $key;                            // step 5
+                    $output.= $temp;                                         // step 6
+                    $output = call_user_func($this->hash, $output);          // step 7
+            }
+        } else {
+            switch ($mode) {
+                case CRYPT_HASH_MODE_MHASH:
+                    $output = mhash($this->hash, $text);
+                    break;
+                case CRYPT_HASH_MODE_HASH:
+                    $output = hash($this->hash, $text, true);
+                    break;
+                case CRYPT_HASH_MODE_INTERNAL:
+                    $output = call_user_func($this->hash, $text);
+            }
+        }
+
+        return substr($output, 0, $this->l);
+    }
+
+    /**
+     * Returns the hash length (in bytes)
+     *
+     * @access public
+     * @return int
+     */
+    function getLength()
+    {
+        return $this->l;
+    }
+
+    /**
+     * Wrapper for MD5
+     *
+     * @access private
+     * @param string $m
+     */
+    function _md5($m)
+    {
+        return pack('H*', md5($m));
+    }
+
+    /**
+     * Wrapper for SHA1
+     *
+     * @access private
+     * @param string $m
+     */
+    function _sha1($m)
+    {
+        return pack('H*', sha1($m));
+    }
+
+    /**
+     * Pure-PHP implementation of MD2
+     *
+     * See {@link http://tools.ietf.org/html/rfc1319 RFC1319}.
+     *
+     * @access private
+     * @param string $m
+     */
+    function _md2($m)
+    {
+        static $s = array(
+             41,  46,  67, 201, 162, 216, 124,   1,  61,  54,  84, 161, 236, 240, 6,
+             19,  98, 167,   5, 243, 192, 199, 115, 140, 152, 147,  43, 217, 188,
+             76, 130, 202,  30, 155,  87,  60, 253, 212, 224,  22, 103,  66, 111, 24,
+            138,  23, 229,  18, 190,  78, 196, 214, 218, 158, 222,  73, 160, 251,
+            245, 142, 187,  47, 238, 122, 169, 104, 121, 145,  21, 178,   7,  63,
+            148, 194,  16, 137,  11,  34,  95,  33, 128, 127,  93, 154,  90, 144, 50,
+             39,  53,  62, 204, 231, 191, 247, 151,   3, 255,  25,  48, 179,  72, 165,
+            181, 209, 215,  94, 146,  42, 172,  86, 170, 198,  79, 184,  56, 210,
+            150, 164, 125, 182, 118, 252, 107, 226, 156, 116,   4, 241,  69, 157,
+            112,  89, 100, 113, 135,  32, 134,  91, 207, 101, 230,  45, 168,   2, 27,
+             96,  37, 173, 174, 176, 185, 246,  28,  70,  97, 105,  52,  64, 126, 15,
+             85,  71, 163,  35, 221,  81, 175,  58, 195,  92, 249, 206, 186, 197,
+            234,  38,  44,  83,  13, 110, 133,  40, 132,   9, 211, 223, 205, 244, 65,
+            129,  77,  82, 106, 220,  55, 200, 108, 193, 171, 250,  36, 225, 123,
+              8,  12, 189, 177,  74, 120, 136, 149, 139, 227,  99, 232, 109, 233,
+            203, 213, 254,  59,   0,  29,  57, 242, 239, 183,  14, 102,  88, 208, 228,
+            166, 119, 114, 248, 235, 117,  75,  10,  49,  68,  80, 180, 143, 237,
+             31,  26, 219, 153, 141,  51, 159,  17, 131, 20
+        );
+
+        // Step 1. Append Padding Bytes
+        $pad = 16 - (strlen($m) & 0xF);
+        $m.= str_repeat(chr($pad), $pad);
+
+        $length = strlen($m);
+
+        // Step 2. Append Checksum
+        $c = str_repeat(chr(0), 16);
+        $l = chr(0);
+        for ($i = 0; $i < $length; $i+= 16) {
+            for ($j = 0; $j < 16; $j++) {
+                // RFC1319 incorrectly states that C[j] should be set to S[c xor L]
+                //$c[$j] = chr($s[ord($m[$i + $j] ^ $l)]);
+                // per <http://www.rfc-editor.org/errata_search.php?rfc=1319>, however, C[j] should be set to S[c xor L] xor C[j]
+                $c[$j] = chr($s[ord($m[$i + $j] ^ $l)] ^ ord($c[$j]));
+                $l = $c[$j];
+            }
+        }
+        $m.= $c;
+
+        $length+= 16;
+
+        // Step 3. Initialize MD Buffer
+        $x = str_repeat(chr(0), 48);
+
+        // Step 4. Process Message in 16-Byte Blocks
+        for ($i = 0; $i < $length; $i+= 16) {
+            for ($j = 0; $j < 16; $j++) {
+                $x[$j + 16] = $m[$i + $j];
+                $x[$j + 32] = $x[$j + 16] ^ $x[$j];
+            }
+            $t = chr(0);
+            for ($j = 0; $j < 18; $j++) {
+                for ($k = 0; $k < 48; $k++) {
+                    $x[$k] = $t = $x[$k] ^ chr($s[ord($t)]);
+                    //$t = $x[$k] = $x[$k] ^ chr($s[ord($t)]);
+                }
+                $t = chr(ord($t) + $j);
+            }
+        }
+
+        // Step 5. Output
+        return substr($x, 0, 16);
+    }
+
+    /**
+     * Pure-PHP implementation of SHA256
+     *
+     * See {@link http://en.wikipedia.org/wiki/SHA_hash_functions#SHA-256_.28a_SHA-2_variant.29_pseudocode SHA-256 (a SHA-2 variant) pseudocode - Wikipedia}.
+     *
+     * @access private
+     * @param string $m
+     */
+    function _sha256($m)
+    {
+        if (extension_loaded('suhosin')) {
+            return pack('H*', sha256($m));
+        }
+
+        // Initialize variables
+        $hash = array(
+            0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19
+        );
+        // Initialize table of round constants
+        // (first 32 bits of the fractional parts of the cube roots of the first 64 primes 2..311)
+        static $k = array(
+            0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
+            0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
+            0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
+            0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
+            0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
+            0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
+            0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
+            0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
+        );
+
+        // Pre-processing
+        $length = strlen($m);
+        // to round to nearest 56 mod 64, we'll add 64 - (length + (64 - 56)) % 64
+        $m.= str_repeat(chr(0), 64 - (($length + 8) & 0x3F));
+        $m[$length] = chr(0x80);
+        // we don't support hashing strings 512MB long
+        $m.= pack('N2', 0, $length << 3);
+
+        // Process the message in successive 512-bit chunks
+        $chunks = str_split($m, 64);
+        foreach ($chunks as $chunk) {
+            $w = array();
+            for ($i = 0; $i < 16; $i++) {
+                extract(unpack('Ntemp', $this->_string_shift($chunk, 4)));
+                $w[] = $temp;
+            }
+
+            // Extend the sixteen 32-bit words into sixty-four 32-bit words
+            for ($i = 16; $i < 64; $i++) {
+                // @codingStandardsIgnoreStart
+                $s0 = $this->_rightRotate($w[$i - 15],  7) ^
+                      $this->_rightRotate($w[$i - 15], 18) ^
+                      $this->_rightShift( $w[$i - 15],  3);
+                $s1 = $this->_rightRotate($w[$i - 2], 17) ^
+                      $this->_rightRotate($w[$i - 2], 19) ^
+                      $this->_rightShift( $w[$i - 2], 10);
+                // @codingStandardsIgnoreEnd
+                $w[$i] = $this->_add($w[$i - 16], $s0, $w[$i - 7], $s1);
+            }
+
+            // Initialize hash value for this chunk
+            list($a, $b, $c, $d, $e, $f, $g, $h) = $hash;
+
+            // Main loop
+            for ($i = 0; $i < 64; $i++) {
+                $s0 = $this->_rightRotate($a,  2) ^
+                      $this->_rightRotate($a, 13) ^
+                      $this->_rightRotate($a, 22);
+                $maj = ($a & $b) ^
+                       ($a & $c) ^
+                       ($b & $c);
+                $t2 = $this->_add($s0, $maj);
+
+                $s1 = $this->_rightRotate($e,  6) ^
+                      $this->_rightRotate($e, 11) ^
+                      $this->_rightRotate($e, 25);
+                $ch = ($e & $f) ^
+                      ($this->_not($e) & $g);
+                $t1 = $this->_add($h, $s1, $ch, $k[$i], $w[$i]);
+
+                $h = $g;
+                $g = $f;
+                $f = $e;
+                $e = $this->_add($d, $t1);
+                $d = $c;
+                $c = $b;
+                $b = $a;
+                $a = $this->_add($t1, $t2);
+            }
+
+            // Add this chunk's hash to result so far
+            $hash = array(
+                $this->_add($hash[0], $a),
+                $this->_add($hash[1], $b),
+                $this->_add($hash[2], $c),
+                $this->_add($hash[3], $d),
+                $this->_add($hash[4], $e),
+                $this->_add($hash[5], $f),
+                $this->_add($hash[6], $g),
+                $this->_add($hash[7], $h)
+            );
+        }
+
+        // Produce the final hash value (big-endian)
+        return pack('N8', $hash[0], $hash[1], $hash[2], $hash[3], $hash[4], $hash[5], $hash[6], $hash[7]);
+    }
+
+    /**
+     * Pure-PHP implementation of SHA384 and SHA512
+     *
+     * @access private
+     * @param string $m
+     */
+    function _sha512($m)
+    {
+        if (!class_exists('Math_BigInteger')) {
+            include_once 'Math/BigInteger.php';
+        }
+
+        static $init384, $init512, $k;
+
+        if (!isset($k)) {
+            // Initialize variables
+            $init384 = array( // initial values for SHA384
+                'cbbb9d5dc1059ed8', '629a292a367cd507', '9159015a3070dd17', '152fecd8f70e5939',
+                '67332667ffc00b31', '8eb44a8768581511', 'db0c2e0d64f98fa7', '47b5481dbefa4fa4'
+            );
+            $init512 = array( // initial values for SHA512
+                '6a09e667f3bcc908', 'bb67ae8584caa73b', '3c6ef372fe94f82b', 'a54ff53a5f1d36f1',
+                '510e527fade682d1', '9b05688c2b3e6c1f', '1f83d9abfb41bd6b', '5be0cd19137e2179'
+            );
+
+            for ($i = 0; $i < 8; $i++) {
+                $init384[$i] = new Math_BigInteger($init384[$i], 16);
+                $init384[$i]->setPrecision(64);
+                $init512[$i] = new Math_BigInteger($init512[$i], 16);
+                $init512[$i]->setPrecision(64);
+            }
+
+            // Initialize table of round constants
+            // (first 64 bits of the fractional parts of the cube roots of the first 80 primes 2..409)
+            $k = array(
+                '428a2f98d728ae22', '7137449123ef65cd', 'b5c0fbcfec4d3b2f', 'e9b5dba58189dbbc',
+                '3956c25bf348b538', '59f111f1b605d019', '923f82a4af194f9b', 'ab1c5ed5da6d8118',
+                'd807aa98a3030242', '12835b0145706fbe', '243185be4ee4b28c', '550c7dc3d5ffb4e2',
+                '72be5d74f27b896f', '80deb1fe3b1696b1', '9bdc06a725c71235', 'c19bf174cf692694',
+                'e49b69c19ef14ad2', 'efbe4786384f25e3', '0fc19dc68b8cd5b5', '240ca1cc77ac9c65',
+                '2de92c6f592b0275', '4a7484aa6ea6e483', '5cb0a9dcbd41fbd4', '76f988da831153b5',
+                '983e5152ee66dfab', 'a831c66d2db43210', 'b00327c898fb213f', 'bf597fc7beef0ee4',
+                'c6e00bf33da88fc2', 'd5a79147930aa725', '06ca6351e003826f', '142929670a0e6e70',
+                '27b70a8546d22ffc', '2e1b21385c26c926', '4d2c6dfc5ac42aed', '53380d139d95b3df',
+                '650a73548baf63de', '766a0abb3c77b2a8', '81c2c92e47edaee6', '92722c851482353b',
+                'a2bfe8a14cf10364', 'a81a664bbc423001', 'c24b8b70d0f89791', 'c76c51a30654be30',
+                'd192e819d6ef5218', 'd69906245565a910', 'f40e35855771202a', '106aa07032bbd1b8',
+                '19a4c116b8d2d0c8', '1e376c085141ab53', '2748774cdf8eeb99', '34b0bcb5e19b48a8',
+                '391c0cb3c5c95a63', '4ed8aa4ae3418acb', '5b9cca4f7763e373', '682e6ff3d6b2b8a3',
+                '748f82ee5defb2fc', '78a5636f43172f60', '84c87814a1f0ab72', '8cc702081a6439ec',
+                '90befffa23631e28', 'a4506cebde82bde9', 'bef9a3f7b2c67915', 'c67178f2e372532b',
+                'ca273eceea26619c', 'd186b8c721c0c207', 'eada7dd6cde0eb1e', 'f57d4f7fee6ed178',
+                '06f067aa72176fba', '0a637dc5a2c898a6', '113f9804bef90dae', '1b710b35131c471b',
+                '28db77f523047d84', '32caab7b40c72493', '3c9ebe0a15c9bebc', '431d67c49c100d4c',
+                '4cc5d4becb3e42b6', '597f299cfc657e2a', '5fcb6fab3ad6faec', '6c44198c4a475817'
+            );
+
+            for ($i = 0; $i < 80; $i++) {
+                $k[$i] = new Math_BigInteger($k[$i], 16);
+            }
+        }
+
+        $hash = $this->l == 48 ? $init384 : $init512;
+
+        // Pre-processing
+        $length = strlen($m);
+        // to round to nearest 112 mod 128, we'll add 128 - (length + (128 - 112)) % 128
+        $m.= str_repeat(chr(0), 128 - (($length + 16) & 0x7F));
+        $m[$length] = chr(0x80);
+        // we don't support hashing strings 512MB long
+        $m.= pack('N4', 0, 0, 0, $length << 3);
+
+        // Process the message in successive 1024-bit chunks
+        $chunks = str_split($m, 128);
+        foreach ($chunks as $chunk) {
+            $w = array();
+            for ($i = 0; $i < 16; $i++) {
+                $temp = new Math_BigInteger($this->_string_shift($chunk, 8), 256);
+                $temp->setPrecision(64);
+                $w[] = $temp;
+            }
+
+            // Extend the sixteen 32-bit words into eighty 32-bit words
+            for ($i = 16; $i < 80; $i++) {
+                $temp = array(
+                          $w[$i - 15]->bitwise_rightRotate(1),
+                          $w[$i - 15]->bitwise_rightRotate(8),
+                          $w[$i - 15]->bitwise_rightShift(7)
+                );
+                $s0 = $temp[0]->bitwise_xor($temp[1]);
+                $s0 = $s0->bitwise_xor($temp[2]);
+                $temp = array(
+                          $w[$i - 2]->bitwise_rightRotate(19),
+                          $w[$i - 2]->bitwise_rightRotate(61),
+                          $w[$i - 2]->bitwise_rightShift(6)
+                );
+                $s1 = $temp[0]->bitwise_xor($temp[1]);
+                $s1 = $s1->bitwise_xor($temp[2]);
+                $w[$i] = $w[$i - 16]->copy();
+                $w[$i] = $w[$i]->add($s0);
+                $w[$i] = $w[$i]->add($w[$i - 7]);
+                $w[$i] = $w[$i]->add($s1);
+            }
+
+            // Initialize hash value for this chunk
+            $a = $hash[0]->copy();
+            $b = $hash[1]->copy();
+            $c = $hash[2]->copy();
+            $d = $hash[3]->copy();
+            $e = $hash[4]->copy();
+            $f = $hash[5]->copy();
+            $g = $hash[6]->copy();
+            $h = $hash[7]->copy();
+
+            // Main loop
+            for ($i = 0; $i < 80; $i++) {
+                $temp = array(
+                    $a->bitwise_rightRotate(28),
+                    $a->bitwise_rightRotate(34),
+                    $a->bitwise_rightRotate(39)
+                );
+                $s0 = $temp[0]->bitwise_xor($temp[1]);
+                $s0 = $s0->bitwise_xor($temp[2]);
+                $temp = array(
+                    $a->bitwise_and($b),
+                    $a->bitwise_and($c),
+                    $b->bitwise_and($c)
+                );
+                $maj = $temp[0]->bitwise_xor($temp[1]);
+                $maj = $maj->bitwise_xor($temp[2]);
+                $t2 = $s0->add($maj);
+
+                $temp = array(
+                    $e->bitwise_rightRotate(14),
+                    $e->bitwise_rightRotate(18),
+                    $e->bitwise_rightRotate(41)
+                );
+                $s1 = $temp[0]->bitwise_xor($temp[1]);
+                $s1 = $s1->bitwise_xor($temp[2]);
+                $temp = array(
+                    $e->bitwise_and($f),
+                    $g->bitwise_and($e->bitwise_not())
+                );
+                $ch = $temp[0]->bitwise_xor($temp[1]);
+                $t1 = $h->add($s1);
+                $t1 = $t1->add($ch);
+                $t1 = $t1->add($k[$i]);
+                $t1 = $t1->add($w[$i]);
+
+                $h = $g->copy();
+                $g = $f->copy();
+                $f = $e->copy();
+                $e = $d->add($t1);
+                $d = $c->copy();
+                $c = $b->copy();
+                $b = $a->copy();
+                $a = $t1->add($t2);
+            }
+
+            // Add this chunk's hash to result so far
+            $hash = array(
+                $hash[0]->add($a),
+                $hash[1]->add($b),
+                $hash[2]->add($c),
+                $hash[3]->add($d),
+                $hash[4]->add($e),
+                $hash[5]->add($f),
+                $hash[6]->add($g),
+                $hash[7]->add($h)
+            );
+        }
+
+        // Produce the final hash value (big-endian)
+        // (Crypt_Hash::hash() trims the output for hashes but not for HMACs.  as such, we trim the output here)
+        $temp = $hash[0]->toBytes() . $hash[1]->toBytes() . $hash[2]->toBytes() . $hash[3]->toBytes() .
+                $hash[4]->toBytes() . $hash[5]->toBytes();
+        if ($this->l != 48) {
+            $temp.= $hash[6]->toBytes() . $hash[7]->toBytes();
+        }
+
+        return $temp;
+    }
+
+    /**
+     * Right Rotate
+     *
+     * @access private
+     * @param int $int
+     * @param int $amt
+     * @see self::_sha256()
+     * @return int
+     */
+    function _rightRotate($int, $amt)
+    {
+        $invamt = 32 - $amt;
+        $mask = (1 << $invamt) - 1;
+        return (($int << $invamt) & 0xFFFFFFFF) | (($int >> $amt) & $mask);
+    }
+
+    /**
+     * Right Shift
+     *
+     * @access private
+     * @param int $int
+     * @param int $amt
+     * @see self::_sha256()
+     * @return int
+     */
+    function _rightShift($int, $amt)
+    {
+        $mask = (1 << (32 - $amt)) - 1;
+        return ($int >> $amt) & $mask;
+    }
+
+    /**
+     * Not
+     *
+     * @access private
+     * @param int $int
+     * @see self::_sha256()
+     * @return int
+     */
+    function _not($int)
+    {
+        return ~$int & 0xFFFFFFFF;
+    }
+
+    /**
+     * Add
+     *
+     * _sha256() adds multiple unsigned 32-bit integers.  Since PHP doesn't support unsigned integers and since the
+     * possibility of overflow exists, care has to be taken.  Math_BigInteger() could be used but this should be faster.
+     *
+     * @param int $...
+     * @return int
+     * @see self::_sha256()
+     * @access private
+     */
+    function _add()
+    {
+        static $mod;
+        if (!isset($mod)) {
+            $mod = pow(2, 32);
+        }
+
+        $result = 0;
+        $arguments = func_get_args();
+        foreach ($arguments as $argument) {
+            $result+= $argument < 0 ? ($argument & 0x7FFFFFFF) + 0x80000000 : $argument;
+        }
+
+        switch (true) {
+            case is_int($result):
+            // PHP 5.3, per http://php.net/releases/5_3_0.php, introduced "more consistent float rounding"
+            case version_compare(PHP_VERSION, '5.3.0') >= 0 && (php_uname('m') & "\xDF\xDF\xDF") != 'ARM':
+            // PHP_OS & "\xDF\xDF\xDF" == strtoupper(substr(PHP_OS, 0, 3)), but a lot faster
+            case (PHP_OS & "\xDF\xDF\xDF") === 'WIN':
+                return fmod($result, $mod);
+        }
+
+        return (fmod($result, 0x80000000) & 0x7FFFFFFF) |
+            ((fmod(floor($result / 0x80000000), 2) & 1) << 31);
+    }
+
+    /**
+     * String Shift
+     *
+     * Inspired by array_shift
+     *
+     * @param string $string
+     * @param int $index
+     * @return string
+     * @access private
+     */
+    function _string_shift(&$string, $index = 1)
+    {
+        $substr = substr($string, 0, $index);
+        $string = substr($string, $index);
+        return $substr;
+    }
+}
diff --git a/lib/php/phpseclib/Crypt/RC2.php b/lib/php/phpseclib/Crypt/RC2.php
new file mode 100644
index 00000000..3d10547f
--- /dev/null
+++ b/lib/php/phpseclib/Crypt/RC2.php
@@ -0,0 +1,761 @@
+<?php
+
+/**
+ * Pure-PHP implementation of RC2.
+ *
+ * Uses mcrypt, if available, and an internal implementation, otherwise.
+ *
+ * PHP versions 4 and 5
+ *
+ * Useful resources are as follows:
+ *
+ *  - {@link http://tools.ietf.org/html/rfc2268}
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ *    include 'Crypt/RC2.php';
+ *
+ *    $rc2 = new Crypt_RC2();
+ *
+ *    $rc2->setKey('abcdefgh');
+ *
+ *    $plaintext = str_repeat('a', 1024);
+ *
+ *    echo $rc2->decrypt($rc2->encrypt($plaintext));
+ * ?>
+ * </code>
+ *
+ * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @category Crypt
+ * @package  Crypt_RC2
+ * @author   Patrick Monnerat <pm@datasphere.ch>
+ * @license  http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link     http://phpseclib.sourceforge.net
+ */
+
+/**
+ * Include Crypt_Base
+ *
+ * Base cipher class
+ */
+if (!class_exists('Crypt_Base')) {
+    include_once 'Base.php';
+}
+
+/**#@+
+ * @access public
+ * @see self::encrypt()
+ * @see self::decrypt()
+ */
+/**
+ * Encrypt / decrypt using the Counter mode.
+ *
+ * Set to -1 since that's what Crypt/Random.php uses to index the CTR mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Counter_.28CTR.29
+ */
+define('CRYPT_RC2_MODE_CTR', CRYPT_MODE_CTR);
+/**
+ * Encrypt / decrypt using the Electronic Code Book mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Electronic_codebook_.28ECB.29
+ */
+define('CRYPT_RC2_MODE_ECB', CRYPT_MODE_ECB);
+/**
+ * Encrypt / decrypt using the Code Book Chaining mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher-block_chaining_.28CBC.29
+ */
+define('CRYPT_RC2_MODE_CBC', CRYPT_MODE_CBC);
+/**
+ * Encrypt / decrypt using the Cipher Feedback mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher_feedback_.28CFB.29
+ */
+define('CRYPT_RC2_MODE_CFB', CRYPT_MODE_CFB);
+/**
+ * Encrypt / decrypt using the Cipher Feedback mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Output_feedback_.28OFB.29
+ */
+define('CRYPT_RC2_MODE_OFB', CRYPT_MODE_OFB);
+/**#@-*/
+
+/**
+ * Pure-PHP implementation of RC2.
+ *
+ * @package Crypt_RC2
+ * @access  public
+ */
+class Crypt_RC2 extends Crypt_Base
+{
+    /**
+     * Block Length of the cipher
+     *
+     * @see Crypt_Base::block_size
+     * @var int
+     * @access private
+     */
+    var $block_size = 8;
+
+    /**
+     * The Key
+     *
+     * @see Crypt_Base::key
+     * @see self::setKey()
+     * @var string
+     * @access private
+     */
+    var $key;
+
+    /**
+     * The Original (unpadded) Key
+     *
+     * @see Crypt_Base::key
+     * @see self::setKey()
+     * @see self::encrypt()
+     * @see self::decrypt()
+     * @var string
+     * @access private
+     */
+    var $orig_key;
+
+    /**
+     * Don't truncate / null pad key
+     *
+     * @see Crypt_Base::_clearBuffers()
+     * @var bool
+     * @access private
+     */
+    var $skip_key_adjustment = true;
+
+    /**
+     * Key Length (in bytes)
+     *
+     * @see Crypt_RC2::setKeyLength()
+     * @var int
+     * @access private
+     */
+    var $key_length = 16; // = 128 bits
+
+    /**
+     * The namespace used by the cipher for its constants.
+     *
+     * @see Crypt_Base::const_namespace
+     * @var string
+     * @access private
+     */
+    var $const_namespace = 'RC2';
+
+    /**
+     * The mcrypt specific name of the cipher
+     *
+     * @see Crypt_Base::cipher_name_mcrypt
+     * @var string
+     * @access private
+     */
+    var $cipher_name_mcrypt = 'rc2';
+
+    /**
+     * Optimizing value while CFB-encrypting
+     *
+     * @see Crypt_Base::cfb_init_len
+     * @var int
+     * @access private
+     */
+    var $cfb_init_len = 500;
+
+    /**
+     * The key length in bits.
+     *
+     * @see self::setKeyLength()
+     * @see self::setKey()
+     * @var int
+     * @access private
+     * @internal Should be in range [1..1024].
+     * @internal Changing this value after setting the key has no effect.
+     */
+    var $default_key_length = 1024;
+
+    /**
+     * The key length in bits.
+     *
+     * @see self::isValidEnine()
+     * @see self::setKey()
+     * @var int
+     * @access private
+     * @internal Should be in range [1..1024].
+     */
+    var $current_key_length;
+
+    /**
+     * The Key Schedule
+     *
+     * @see self::_setupKey()
+     * @var array
+     * @access private
+     */
+    var $keys;
+
+    /**
+     * Key expansion randomization table.
+     * Twice the same 256-value sequence to save a modulus in key expansion.
+     *
+     * @see self::setKey()
+     * @var array
+     * @access private
+     */
+    var $pitable = array(
+        0xD9, 0x78, 0xF9, 0xC4, 0x19, 0xDD, 0xB5, 0xED,
+        0x28, 0xE9, 0xFD, 0x79, 0x4A, 0xA0, 0xD8, 0x9D,
+        0xC6, 0x7E, 0x37, 0x83, 0x2B, 0x76, 0x53, 0x8E,
+        0x62, 0x4C, 0x64, 0x88, 0x44, 0x8B, 0xFB, 0xA2,
+        0x17, 0x9A, 0x59, 0xF5, 0x87, 0xB3, 0x4F, 0x13,
+        0x61, 0x45, 0x6D, 0x8D, 0x09, 0x81, 0x7D, 0x32,
+        0xBD, 0x8F, 0x40, 0xEB, 0x86, 0xB7, 0x7B, 0x0B,
+        0xF0, 0x95, 0x21, 0x22, 0x5C, 0x6B, 0x4E, 0x82,
+        0x54, 0xD6, 0x65, 0x93, 0xCE, 0x60, 0xB2, 0x1C,
+        0x73, 0x56, 0xC0, 0x14, 0xA7, 0x8C, 0xF1, 0xDC,
+        0x12, 0x75, 0xCA, 0x1F, 0x3B, 0xBE, 0xE4, 0xD1,
+        0x42, 0x3D, 0xD4, 0x30, 0xA3, 0x3C, 0xB6, 0x26,
+        0x6F, 0xBF, 0x0E, 0xDA, 0x46, 0x69, 0x07, 0x57,
+        0x27, 0xF2, 0x1D, 0x9B, 0xBC, 0x94, 0x43, 0x03,
+        0xF8, 0x11, 0xC7, 0xF6, 0x90, 0xEF, 0x3E, 0xE7,
+        0x06, 0xC3, 0xD5, 0x2F, 0xC8, 0x66, 0x1E, 0xD7,
+        0x08, 0xE8, 0xEA, 0xDE, 0x80, 0x52, 0xEE, 0xF7,
+        0x84, 0xAA, 0x72, 0xAC, 0x35, 0x4D, 0x6A, 0x2A,
+        0x96, 0x1A, 0xD2, 0x71, 0x5A, 0x15, 0x49, 0x74,
+        0x4B, 0x9F, 0xD0, 0x5E, 0x04, 0x18, 0xA4, 0xEC,
+        0xC2, 0xE0, 0x41, 0x6E, 0x0F, 0x51, 0xCB, 0xCC,
+        0x24, 0x91, 0xAF, 0x50, 0xA1, 0xF4, 0x70, 0x39,
+        0x99, 0x7C, 0x3A, 0x85, 0x23, 0xB8, 0xB4, 0x7A,
+        0xFC, 0x02, 0x36, 0x5B, 0x25, 0x55, 0x97, 0x31,
+        0x2D, 0x5D, 0xFA, 0x98, 0xE3, 0x8A, 0x92, 0xAE,
+        0x05, 0xDF, 0x29, 0x10, 0x67, 0x6C, 0xBA, 0xC9,
+        0xD3, 0x00, 0xE6, 0xCF, 0xE1, 0x9E, 0xA8, 0x2C,
+        0x63, 0x16, 0x01, 0x3F, 0x58, 0xE2, 0x89, 0xA9,
+        0x0D, 0x38, 0x34, 0x1B, 0xAB, 0x33, 0xFF, 0xB0,
+        0xBB, 0x48, 0x0C, 0x5F, 0xB9, 0xB1, 0xCD, 0x2E,
+        0xC5, 0xF3, 0xDB, 0x47, 0xE5, 0xA5, 0x9C, 0x77,
+        0x0A, 0xA6, 0x20, 0x68, 0xFE, 0x7F, 0xC1, 0xAD,
+        0xD9, 0x78, 0xF9, 0xC4, 0x19, 0xDD, 0xB5, 0xED,
+        0x28, 0xE9, 0xFD, 0x79, 0x4A, 0xA0, 0xD8, 0x9D,
+        0xC6, 0x7E, 0x37, 0x83, 0x2B, 0x76, 0x53, 0x8E,
+        0x62, 0x4C, 0x64, 0x88, 0x44, 0x8B, 0xFB, 0xA2,
+        0x17, 0x9A, 0x59, 0xF5, 0x87, 0xB3, 0x4F, 0x13,
+        0x61, 0x45, 0x6D, 0x8D, 0x09, 0x81, 0x7D, 0x32,
+        0xBD, 0x8F, 0x40, 0xEB, 0x86, 0xB7, 0x7B, 0x0B,
+        0xF0, 0x95, 0x21, 0x22, 0x5C, 0x6B, 0x4E, 0x82,
+        0x54, 0xD6, 0x65, 0x93, 0xCE, 0x60, 0xB2, 0x1C,
+        0x73, 0x56, 0xC0, 0x14, 0xA7, 0x8C, 0xF1, 0xDC,
+        0x12, 0x75, 0xCA, 0x1F, 0x3B, 0xBE, 0xE4, 0xD1,
+        0x42, 0x3D, 0xD4, 0x30, 0xA3, 0x3C, 0xB6, 0x26,
+        0x6F, 0xBF, 0x0E, 0xDA, 0x46, 0x69, 0x07, 0x57,
+        0x27, 0xF2, 0x1D, 0x9B, 0xBC, 0x94, 0x43, 0x03,
+        0xF8, 0x11, 0xC7, 0xF6, 0x90, 0xEF, 0x3E, 0xE7,
+        0x06, 0xC3, 0xD5, 0x2F, 0xC8, 0x66, 0x1E, 0xD7,
+        0x08, 0xE8, 0xEA, 0xDE, 0x80, 0x52, 0xEE, 0xF7,
+        0x84, 0xAA, 0x72, 0xAC, 0x35, 0x4D, 0x6A, 0x2A,
+        0x96, 0x1A, 0xD2, 0x71, 0x5A, 0x15, 0x49, 0x74,
+        0x4B, 0x9F, 0xD0, 0x5E, 0x04, 0x18, 0xA4, 0xEC,
+        0xC2, 0xE0, 0x41, 0x6E, 0x0F, 0x51, 0xCB, 0xCC,
+        0x24, 0x91, 0xAF, 0x50, 0xA1, 0xF4, 0x70, 0x39,
+        0x99, 0x7C, 0x3A, 0x85, 0x23, 0xB8, 0xB4, 0x7A,
+        0xFC, 0x02, 0x36, 0x5B, 0x25, 0x55, 0x97, 0x31,
+        0x2D, 0x5D, 0xFA, 0x98, 0xE3, 0x8A, 0x92, 0xAE,
+        0x05, 0xDF, 0x29, 0x10, 0x67, 0x6C, 0xBA, 0xC9,
+        0xD3, 0x00, 0xE6, 0xCF, 0xE1, 0x9E, 0xA8, 0x2C,
+        0x63, 0x16, 0x01, 0x3F, 0x58, 0xE2, 0x89, 0xA9,
+        0x0D, 0x38, 0x34, 0x1B, 0xAB, 0x33, 0xFF, 0xB0,
+        0xBB, 0x48, 0x0C, 0x5F, 0xB9, 0xB1, 0xCD, 0x2E,
+        0xC5, 0xF3, 0xDB, 0x47, 0xE5, 0xA5, 0x9C, 0x77,
+        0x0A, 0xA6, 0x20, 0x68, 0xFE, 0x7F, 0xC1, 0xAD
+    );
+
+    /**
+     * Inverse key expansion randomization table.
+     *
+     * @see self::setKey()
+     * @var array
+     * @access private
+     */
+    var $invpitable = array(
+        0xD1, 0xDA, 0xB9, 0x6F, 0x9C, 0xC8, 0x78, 0x66,
+        0x80, 0x2C, 0xF8, 0x37, 0xEA, 0xE0, 0x62, 0xA4,
+        0xCB, 0x71, 0x50, 0x27, 0x4B, 0x95, 0xD9, 0x20,
+        0x9D, 0x04, 0x91, 0xE3, 0x47, 0x6A, 0x7E, 0x53,
+        0xFA, 0x3A, 0x3B, 0xB4, 0xA8, 0xBC, 0x5F, 0x68,
+        0x08, 0xCA, 0x8F, 0x14, 0xD7, 0xC0, 0xEF, 0x7B,
+        0x5B, 0xBF, 0x2F, 0xE5, 0xE2, 0x8C, 0xBA, 0x12,
+        0xE1, 0xAF, 0xB2, 0x54, 0x5D, 0x59, 0x76, 0xDB,
+        0x32, 0xA2, 0x58, 0x6E, 0x1C, 0x29, 0x64, 0xF3,
+        0xE9, 0x96, 0x0C, 0x98, 0x19, 0x8D, 0x3E, 0x26,
+        0xAB, 0xA5, 0x85, 0x16, 0x40, 0xBD, 0x49, 0x67,
+        0xDC, 0x22, 0x94, 0xBB, 0x3C, 0xC1, 0x9B, 0xEB,
+        0x45, 0x28, 0x18, 0xD8, 0x1A, 0x42, 0x7D, 0xCC,
+        0xFB, 0x65, 0x8E, 0x3D, 0xCD, 0x2A, 0xA3, 0x60,
+        0xAE, 0x93, 0x8A, 0x48, 0x97, 0x51, 0x15, 0xF7,
+        0x01, 0x0B, 0xB7, 0x36, 0xB1, 0x2E, 0x11, 0xFD,
+        0x84, 0x2D, 0x3F, 0x13, 0x88, 0xB3, 0x34, 0x24,
+        0x1B, 0xDE, 0xC5, 0x1D, 0x4D, 0x2B, 0x17, 0x31,
+        0x74, 0xA9, 0xC6, 0x43, 0x6D, 0x39, 0x90, 0xBE,
+        0xC3, 0xB0, 0x21, 0x6B, 0xF6, 0x0F, 0xD5, 0x99,
+        0x0D, 0xAC, 0x1F, 0x5C, 0x9E, 0xF5, 0xF9, 0x4C,
+        0xD6, 0xDF, 0x89, 0xE4, 0x8B, 0xFF, 0xC7, 0xAA,
+        0xE7, 0xED, 0x46, 0x25, 0xB6, 0x06, 0x5E, 0x35,
+        0xB5, 0xEC, 0xCE, 0xE8, 0x6C, 0x30, 0x55, 0x61,
+        0x4A, 0xFE, 0xA0, 0x79, 0x03, 0xF0, 0x10, 0x72,
+        0x7C, 0xCF, 0x52, 0xA6, 0xA7, 0xEE, 0x44, 0xD3,
+        0x9A, 0x57, 0x92, 0xD0, 0x5A, 0x7A, 0x41, 0x7F,
+        0x0E, 0x00, 0x63, 0xF2, 0x4F, 0x05, 0x83, 0xC9,
+        0xA1, 0xD4, 0xDD, 0xC4, 0x56, 0xF4, 0xD2, 0x77,
+        0x81, 0x09, 0x82, 0x33, 0x9F, 0x07, 0x86, 0x75,
+        0x38, 0x4E, 0x69, 0xF1, 0xAD, 0x23, 0x73, 0x87,
+        0x70, 0x02, 0xC2, 0x1E, 0xB8, 0x0A, 0xFC, 0xE6
+    );
+
+    /**
+     * Test for engine validity
+     *
+     * This is mainly just a wrapper to set things up for Crypt_Base::isValidEngine()
+     *
+     * @see Crypt_Base::Crypt_Base()
+     * @param int $engine
+     * @access public
+     * @return bool
+     */
+    function isValidEngine($engine)
+    {
+        switch ($engine) {
+            case CRYPT_ENGINE_OPENSSL:
+                if ($this->current_key_length != 128 || strlen($this->orig_key) < 16) {
+                    return false;
+                }
+                $this->cipher_name_openssl_ecb = 'rc2-ecb';
+                $this->cipher_name_openssl = 'rc2-' . $this->_openssl_translate_mode();
+        }
+
+        return parent::isValidEngine($engine);
+    }
+
+    /**
+     * Sets the key length.
+     *
+     * Valid key lengths are 8 to 1024.
+     * Calling this function after setting the key has no effect until the next
+     *  Crypt_RC2::setKey() call.
+     *
+     * @access public
+     * @param int $length in bits
+     */
+    function setKeyLength($length)
+    {
+        if ($length < 8) {
+            $this->default_key_length = 1;
+        } elseif ($length > 1024) {
+            $this->default_key_length = 128;
+        } else {
+            $this->default_key_length = $length;
+        }
+        $this->current_key_length = $this->default_key_length;
+
+        parent::setKeyLength($length);
+    }
+
+    /**
+     * Returns the current key length
+     *
+     * @access public
+     * @return int
+     */
+    function getKeyLength()
+    {
+        return $this->current_key_length;
+    }
+
+    /**
+     * Sets the key.
+     *
+     * Keys can be of any length. RC2, itself, uses 8 to 1024 bit keys (eg.
+     * strlen($key) <= 128), however, we only use the first 128 bytes if $key
+     * has more then 128 bytes in it, and set $key to a single null byte if
+     * it is empty.
+     *
+     * If the key is not explicitly set, it'll be assumed to be a single
+     * null byte.
+     *
+     * @see Crypt_Base::setKey()
+     * @access public
+     * @param string $key
+     * @param int $t1 optional Effective key length in bits.
+     */
+    function setKey($key, $t1 = 0)
+    {
+        $this->orig_key = $key;
+
+        if ($t1 <= 0) {
+            $t1 = $this->default_key_length;
+        } elseif ($t1 > 1024) {
+            $t1 = 1024;
+        }
+        $this->current_key_length = $t1;
+        // Key byte count should be 1..128.
+        $key = strlen($key) ? substr($key, 0, 128) : "\x00";
+        $t = strlen($key);
+
+        // The mcrypt RC2 implementation only supports effective key length
+        // of 1024 bits. It is however possible to handle effective key
+        // lengths in range 1..1024 by expanding the key and applying
+        // inverse pitable mapping to the first byte before submitting it
+        // to mcrypt.
+
+        // Key expansion.
+        $l = array_values(unpack('C*', $key));
+        $t8 = ($t1 + 7) >> 3;
+        $tm = 0xFF >> (8 * $t8 - $t1);
+
+        // Expand key.
+        $pitable = $this->pitable;
+        for ($i = $t; $i < 128; $i++) {
+            $l[$i] = $pitable[$l[$i - 1] + $l[$i - $t]];
+        }
+        $i = 128 - $t8;
+        $l[$i] = $pitable[$l[$i] & $tm];
+        while ($i--) {
+            $l[$i] = $pitable[$l[$i + 1] ^ $l[$i + $t8]];
+        }
+
+        // Prepare the key for mcrypt.
+        $l[0] = $this->invpitable[$l[0]];
+        array_unshift($l, 'C*');
+
+        parent::setKey(call_user_func_array('pack', $l));
+    }
+
+    /**
+     * Encrypts a message.
+     *
+     * Mostly a wrapper for Crypt_Base::encrypt, with some additional OpenSSL handling code
+     *
+     * @see self::decrypt()
+     * @access public
+     * @param string $plaintext
+     * @return string $ciphertext
+     */
+    function encrypt($plaintext)
+    {
+        if ($this->engine == CRYPT_ENGINE_OPENSSL) {
+            $temp = $this->key;
+            $this->key = $this->orig_key;
+            $result = parent::encrypt($plaintext);
+            $this->key = $temp;
+            return $result;
+        }
+
+        return parent::encrypt($plaintext);
+    }
+
+    /**
+     * Decrypts a message.
+     *
+     * Mostly a wrapper for Crypt_Base::decrypt, with some additional OpenSSL handling code
+     *
+     * @see self::encrypt()
+     * @access public
+     * @param string $ciphertext
+     * @return string $plaintext
+     */
+    function decrypt($ciphertext)
+    {
+        if ($this->engine == CRYPT_ENGINE_OPENSSL) {
+            $temp = $this->key;
+            $this->key = $this->orig_key;
+            $result = parent::decrypt($ciphertext);
+            $this->key = $temp;
+            return $result;
+        }
+
+        return parent::decrypt($ciphertext);
+    }
+
+    /**
+     * Encrypts a block
+     *
+     * @see Crypt_Base::_encryptBlock()
+     * @see Crypt_Base::encrypt()
+     * @access private
+     * @param string $in
+     * @return string
+     */
+    function _encryptBlock($in)
+    {
+        list($r0, $r1, $r2, $r3) = array_values(unpack('v*', $in));
+        $keys = $this->keys;
+        $limit = 20;
+        $actions = array($limit => 44, 44 => 64);
+        $j = 0;
+
+        for (;;) {
+            // Mixing round.
+            $r0 = (($r0 + $keys[$j++] + ((($r1 ^ $r2) & $r3) ^ $r1)) & 0xFFFF) << 1;
+            $r0 |= $r0 >> 16;
+            $r1 = (($r1 + $keys[$j++] + ((($r2 ^ $r3) & $r0) ^ $r2)) & 0xFFFF) << 2;
+            $r1 |= $r1 >> 16;
+            $r2 = (($r2 + $keys[$j++] + ((($r3 ^ $r0) & $r1) ^ $r3)) & 0xFFFF) << 3;
+            $r2 |= $r2 >> 16;
+            $r3 = (($r3 + $keys[$j++] + ((($r0 ^ $r1) & $r2) ^ $r0)) & 0xFFFF) << 5;
+            $r3 |= $r3 >> 16;
+
+            if ($j === $limit) {
+                if ($limit === 64) {
+                    break;
+                }
+
+                // Mashing round.
+                $r0 += $keys[$r3 & 0x3F];
+                $r1 += $keys[$r0 & 0x3F];
+                $r2 += $keys[$r1 & 0x3F];
+                $r3 += $keys[$r2 & 0x3F];
+                $limit = $actions[$limit];
+            }
+        }
+
+        return pack('vvvv', $r0, $r1, $r2, $r3);
+    }
+
+    /**
+     * Decrypts a block
+     *
+     * @see Crypt_Base::_decryptBlock()
+     * @see Crypt_Base::decrypt()
+     * @access private
+     * @param string $in
+     * @return string
+     */
+    function _decryptBlock($in)
+    {
+        list($r0, $r1, $r2, $r3) = array_values(unpack('v*', $in));
+        $keys = $this->keys;
+        $limit = 44;
+        $actions = array($limit => 20, 20 => 0);
+        $j = 64;
+
+        for (;;) {
+            // R-mixing round.
+            $r3 = ($r3 | ($r3 << 16)) >> 5;
+            $r3 = ($r3 - $keys[--$j] - ((($r0 ^ $r1) & $r2) ^ $r0)) & 0xFFFF;
+            $r2 = ($r2 | ($r2 << 16)) >> 3;
+            $r2 = ($r2 - $keys[--$j] - ((($r3 ^ $r0) & $r1) ^ $r3)) & 0xFFFF;
+            $r1 = ($r1 | ($r1 << 16)) >> 2;
+            $r1 = ($r1 - $keys[--$j] - ((($r2 ^ $r3) & $r0) ^ $r2)) & 0xFFFF;
+            $r0 = ($r0 | ($r0 << 16)) >> 1;
+            $r0 = ($r0 - $keys[--$j] - ((($r1 ^ $r2) & $r3) ^ $r1)) & 0xFFFF;
+
+            if ($j === $limit) {
+                if ($limit === 0) {
+                    break;
+                }
+
+                // R-mashing round.
+                $r3 = ($r3 - $keys[$r2 & 0x3F]) & 0xFFFF;
+                $r2 = ($r2 - $keys[$r1 & 0x3F]) & 0xFFFF;
+                $r1 = ($r1 - $keys[$r0 & 0x3F]) & 0xFFFF;
+                $r0 = ($r0 - $keys[$r3 & 0x3F]) & 0xFFFF;
+                $limit = $actions[$limit];
+            }
+        }
+
+        return pack('vvvv', $r0, $r1, $r2, $r3);
+    }
+
+    /**
+     * Setup the CRYPT_ENGINE_MCRYPT $engine
+     *
+     * @see Crypt_Base::_setupMcrypt()
+     * @access private
+     */
+    function _setupMcrypt()
+    {
+        if (!isset($this->key)) {
+            $this->setKey('');
+        }
+
+        parent::_setupMcrypt();
+    }
+
+    /**
+     * Creates the key schedule
+     *
+     * @see Crypt_Base::_setupKey()
+     * @access private
+     */
+    function _setupKey()
+    {
+        if (!isset($this->key)) {
+            $this->setKey('');
+        }
+
+        // Key has already been expanded in Crypt_RC2::setKey():
+        // Only the first value must be altered.
+        $l = unpack('Ca/Cb/v*', $this->key);
+        array_unshift($l, $this->pitable[$l['a']] | ($l['b'] << 8));
+        unset($l['a']);
+        unset($l['b']);
+        $this->keys = $l;
+    }
+
+    /**
+     * Setup the performance-optimized function for de/encrypt()
+     *
+     * @see Crypt_Base::_setupInlineCrypt()
+     * @access private
+     */
+    function _setupInlineCrypt()
+    {
+        $lambda_functions = &Crypt_RC2::_getLambdaFunctions();
+
+        // The first 10 generated $lambda_functions will use the $keys hardcoded as integers
+        // for the mixing rounds, for better inline crypt performance [~20% faster].
+        // But for memory reason we have to limit those ultra-optimized $lambda_functions to an amount of 10.
+        // (Currently, for Crypt_RC2, one generated $lambda_function cost on php5.5@32bit ~60kb unfreeable mem and ~100kb on php5.5@64bit)
+        $gen_hi_opt_code = (bool)(count($lambda_functions) < 10);
+
+        // Generation of a unique hash for our generated code
+        $code_hash = "Crypt_RC2, {$this->mode}";
+        if ($gen_hi_opt_code) {
+            $code_hash = str_pad($code_hash, 32) . $this->_hashInlineCryptFunction($this->key);
+        }
+
+        // Is there a re-usable $lambda_functions in there?
+        // If not, we have to create it.
+        if (!isset($lambda_functions[$code_hash])) {
+            // Init code for both, encrypt and decrypt.
+            $init_crypt = '$keys = $self->keys;';
+
+            switch (true) {
+                case $gen_hi_opt_code:
+                    $keys = $this->keys;
+                default:
+                    $keys = array();
+                    foreach ($this->keys as $k => $v) {
+                        $keys[$k] = '$keys[' . $k . ']';
+                    }
+            }
+
+            // $in is the current 8 bytes block which has to be en/decrypt
+            $encrypt_block = $decrypt_block = '
+                $in = unpack("v4", $in);
+                $r0 = $in[1];
+                $r1 = $in[2];
+                $r2 = $in[3];
+                $r3 = $in[4];
+            ';
+
+            // Create code for encryption.
+            $limit = 20;
+            $actions = array($limit => 44, 44 => 64);
+            $j = 0;
+
+            for (;;) {
+                // Mixing round.
+                $encrypt_block .= '
+                    $r0 = (($r0 + ' . $keys[$j++] . ' +
+                           ((($r1 ^ $r2) & $r3) ^ $r1)) & 0xFFFF) << 1;
+                    $r0 |= $r0 >> 16;
+                    $r1 = (($r1 + ' . $keys[$j++] . ' +
+                           ((($r2 ^ $r3) & $r0) ^ $r2)) & 0xFFFF) << 2;
+                    $r1 |= $r1 >> 16;
+                    $r2 = (($r2 + ' . $keys[$j++] . ' +
+                           ((($r3 ^ $r0) & $r1) ^ $r3)) & 0xFFFF) << 3;
+                    $r2 |= $r2 >> 16;
+                    $r3 = (($r3 + ' . $keys[$j++] . ' +
+                           ((($r0 ^ $r1) & $r2) ^ $r0)) & 0xFFFF) << 5;
+                    $r3 |= $r3 >> 16;';
+
+                if ($j === $limit) {
+                    if ($limit === 64) {
+                        break;
+                    }
+
+                    // Mashing round.
+                    $encrypt_block .= '
+                        $r0 += $keys[$r3 & 0x3F];
+                        $r1 += $keys[$r0 & 0x3F];
+                        $r2 += $keys[$r1 & 0x3F];
+                        $r3 += $keys[$r2 & 0x3F];';
+                    $limit = $actions[$limit];
+                }
+            }
+
+            $encrypt_block .= '$in = pack("v4", $r0, $r1, $r2, $r3);';
+
+            // Create code for decryption.
+            $limit = 44;
+            $actions = array($limit => 20, 20 => 0);
+            $j = 64;
+
+            for (;;) {
+                // R-mixing round.
+                $decrypt_block .= '
+                    $r3 = ($r3 | ($r3 << 16)) >> 5;
+                    $r3 = ($r3 - ' . $keys[--$j] . ' -
+                           ((($r0 ^ $r1) & $r2) ^ $r0)) & 0xFFFF;
+                    $r2 = ($r2 | ($r2 << 16)) >> 3;
+                    $r2 = ($r2 - ' . $keys[--$j] . ' -
+                           ((($r3 ^ $r0) & $r1) ^ $r3)) & 0xFFFF;
+                    $r1 = ($r1 | ($r1 << 16)) >> 2;
+                    $r1 = ($r1 - ' . $keys[--$j] . ' -
+                           ((($r2 ^ $r3) & $r0) ^ $r2)) & 0xFFFF;
+                    $r0 = ($r0 | ($r0 << 16)) >> 1;
+                    $r0 = ($r0 - ' . $keys[--$j] . ' -
+                           ((($r1 ^ $r2) & $r3) ^ $r1)) & 0xFFFF;';
+
+                if ($j === $limit) {
+                    if ($limit === 0) {
+                        break;
+                    }
+
+                    // R-mashing round.
+                    $decrypt_block .= '
+                        $r3 = ($r3 - $keys[$r2 & 0x3F]) & 0xFFFF;
+                        $r2 = ($r2 - $keys[$r1 & 0x3F]) & 0xFFFF;
+                        $r1 = ($r1 - $keys[$r0 & 0x3F]) & 0xFFFF;
+                        $r0 = ($r0 - $keys[$r3 & 0x3F]) & 0xFFFF;';
+                    $limit = $actions[$limit];
+                }
+            }
+
+            $decrypt_block .= '$in = pack("v4", $r0, $r1, $r2, $r3);';
+
+            // Creates the inline-crypt function
+            $lambda_functions[$code_hash] = $this->_createInlineCryptFunction(
+                array(
+                   'init_crypt'    => $init_crypt,
+                   'encrypt_block' => $encrypt_block,
+                   'decrypt_block' => $decrypt_block
+                )
+            );
+        }
+
+        // Set the inline-crypt function as callback in: $this->inline_crypt
+        $this->inline_crypt = $lambda_functions[$code_hash];
+    }
+}
diff --git a/lib/php/phpseclib/Crypt/RC4.php b/lib/php/phpseclib/Crypt/RC4.php
new file mode 100644
index 00000000..51d5d44e
--- /dev/null
+++ b/lib/php/phpseclib/Crypt/RC4.php
@@ -0,0 +1,366 @@
+<?php
+
+/**
+ * Pure-PHP implementation of RC4.
+ *
+ * Uses mcrypt, if available, and an internal implementation, otherwise.
+ *
+ * PHP versions 4 and 5
+ *
+ * Useful resources are as follows:
+ *
+ *  - {@link http://www.mozilla.org/projects/security/pki/nss/draft-kaukonen-cipher-arcfour-03.txt ARCFOUR Algorithm}
+ *  - {@link http://en.wikipedia.org/wiki/RC4 - Wikipedia: RC4}
+ *
+ * RC4 is also known as ARCFOUR or ARC4.  The reason is elaborated upon at Wikipedia.  This class is named RC4 and not
+ * ARCFOUR or ARC4 because RC4 is how it is referred to in the SSH1 specification.
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ *    include 'Crypt/RC4.php';
+ *
+ *    $rc4 = new Crypt_RC4();
+ *
+ *    $rc4->setKey('abcdefgh');
+ *
+ *    $size = 10 * 1024;
+ *    $plaintext = '';
+ *    for ($i = 0; $i < $size; $i++) {
+ *        $plaintext.= 'a';
+ *    }
+ *
+ *    echo $rc4->decrypt($rc4->encrypt($plaintext));
+ * ?>
+ * </code>
+ *
+ * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @category  Crypt
+ * @package   Crypt_RC4
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2007 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+/**
+ * Include Crypt_Base
+ *
+ * Base cipher class
+ */
+if (!class_exists('Crypt_Base')) {
+    include_once 'Base.php';
+}
+
+/**#@+
+ * @access private
+ * @see self::_crypt()
+ */
+define('CRYPT_RC4_ENCRYPT', 0);
+define('CRYPT_RC4_DECRYPT', 1);
+/**#@-*/
+
+/**
+ * Pure-PHP implementation of RC4.
+ *
+ * @package Crypt_RC4
+ * @author  Jim Wigginton <terrafrost@php.net>
+ * @access  public
+ */
+class Crypt_RC4 extends Crypt_Base
+{
+    /**
+     * Block Length of the cipher
+     *
+     * RC4 is a stream cipher
+     * so we the block_size to 0
+     *
+     * @see Crypt_Base::block_size
+     * @var int
+     * @access private
+     */
+    var $block_size = 0;
+
+    /**
+     * Key Length (in bytes)
+     *
+     * @see Crypt_RC4::setKeyLength()
+     * @var int
+     * @access private
+     */
+    var $key_length = 128; // = 1024 bits
+
+    /**
+     * The namespace used by the cipher for its constants.
+     *
+     * @see Crypt_Base::const_namespace
+     * @var string
+     * @access private
+     */
+    var $const_namespace = 'RC4';
+
+    /**
+     * The mcrypt specific name of the cipher
+     *
+     * @see Crypt_Base::cipher_name_mcrypt
+     * @var string
+     * @access private
+     */
+    var $cipher_name_mcrypt = 'arcfour';
+
+    /**
+     * Holds whether performance-optimized $inline_crypt() can/should be used.
+     *
+     * @see Crypt_Base::inline_crypt
+     * @var mixed
+     * @access private
+     */
+    var $use_inline_crypt = false; // currently not available
+
+    /**
+     * The Key
+     *
+     * @see self::setKey()
+     * @var string
+     * @access private
+     */
+    var $key;
+
+    /**
+     * The Key Stream for decryption and encryption
+     *
+     * @see self::setKey()
+     * @var array
+     * @access private
+     */
+    var $stream;
+
+    /**
+     * Default Constructor.
+     *
+     * Determines whether or not the mcrypt extension should be used.
+     *
+     * @see Crypt_Base::Crypt_Base()
+     * @return Crypt_RC4
+     * @access public
+     */
+    function __construct()
+    {
+        parent::__construct(CRYPT_MODE_STREAM);
+    }
+
+    /**
+     * PHP4 compatible Default Constructor.
+     *
+     * @see self::__construct()
+     * @access public
+     */
+    function Crypt_RC4()
+    {
+        $this->__construct();
+    }
+
+    /**
+     * Test for engine validity
+     *
+     * This is mainly just a wrapper to set things up for Crypt_Base::isValidEngine()
+     *
+     * @see Crypt_Base::Crypt_Base()
+     * @param int $engine
+     * @access public
+     * @return bool
+     */
+    function isValidEngine($engine)
+    {
+        if ($engine == CRYPT_ENGINE_OPENSSL) {
+            if (version_compare(PHP_VERSION, '5.3.7') >= 0) {
+                $this->cipher_name_openssl = 'rc4-40';
+            } else {
+                switch (strlen($this->key)) {
+                    case 5:
+                        $this->cipher_name_openssl = 'rc4-40';
+                        break;
+                    case 8:
+                        $this->cipher_name_openssl = 'rc4-64';
+                        break;
+                    case 16:
+                        $this->cipher_name_openssl = 'rc4';
+                        break;
+                    default:
+                        return false;
+                }
+            }
+        }
+
+        return parent::isValidEngine($engine);
+    }
+
+    /**
+     * Dummy function.
+     *
+     * Some protocols, such as WEP, prepend an "initialization vector" to the key, effectively creating a new key [1].
+     * If you need to use an initialization vector in this manner, feel free to prepend it to the key, yourself, before
+     * calling setKey().
+     *
+     * [1] WEP's initialization vectors (IV's) are used in a somewhat insecure way.  Since, in that protocol,
+     * the IV's are relatively easy to predict, an attack described by
+     * {@link http://www.drizzle.com/~aboba/IEEE/rc4_ksaproc.pdf Scott Fluhrer, Itsik Mantin, and Adi Shamir}
+     * can be used to quickly guess at the rest of the key.  The following links elaborate:
+     *
+     * {@link http://www.rsa.com/rsalabs/node.asp?id=2009 http://www.rsa.com/rsalabs/node.asp?id=2009}
+     * {@link http://en.wikipedia.org/wiki/Related_key_attack http://en.wikipedia.org/wiki/Related_key_attack}
+     *
+     * @param string $iv
+     * @see self::setKey()
+     * @access public
+     */
+    function setIV($iv)
+    {
+    }
+
+    /**
+     * Sets the key length
+     *
+     * Keys can be between 1 and 256 bytes long.
+     *
+     * @access public
+     * @param int $length
+     */
+    function setKeyLength($length)
+    {
+        if ($length < 8) {
+            $this->key_length = 1;
+        } elseif ($length > 2048) {
+            $this->key_length = 256;
+        } else {
+            $this->key_length = $length >> 3;
+        }
+
+        parent::setKeyLength($length);
+    }
+
+    /**
+     * Encrypts a message.
+     *
+     * @see Crypt_Base::decrypt()
+     * @see self::_crypt()
+     * @access public
+     * @param string $plaintext
+     * @return string $ciphertext
+     */
+    function encrypt($plaintext)
+    {
+        if ($this->engine != CRYPT_ENGINE_INTERNAL) {
+            return parent::encrypt($plaintext);
+        }
+        return $this->_crypt($plaintext, CRYPT_RC4_ENCRYPT);
+    }
+
+    /**
+     * Decrypts a message.
+     *
+     * $this->decrypt($this->encrypt($plaintext)) == $this->encrypt($this->encrypt($plaintext)).
+     * At least if the continuous buffer is disabled.
+     *
+     * @see Crypt_Base::encrypt()
+     * @see self::_crypt()
+     * @access public
+     * @param string $ciphertext
+     * @return string $plaintext
+     */
+    function decrypt($ciphertext)
+    {
+        if ($this->engine != CRYPT_ENGINE_INTERNAL) {
+            return parent::decrypt($ciphertext);
+        }
+        return $this->_crypt($ciphertext, CRYPT_RC4_DECRYPT);
+    }
+
+
+    /**
+     * Setup the key (expansion)
+     *
+     * @see Crypt_Base::_setupKey()
+     * @access private
+     */
+    function _setupKey()
+    {
+        $key = $this->key;
+        $keyLength = strlen($key);
+        $keyStream = range(0, 255);
+        $j = 0;
+        for ($i = 0; $i < 256; $i++) {
+            $j = ($j + $keyStream[$i] + ord($key[$i % $keyLength])) & 255;
+            $temp = $keyStream[$i];
+            $keyStream[$i] = $keyStream[$j];
+            $keyStream[$j] = $temp;
+        }
+
+        $this->stream = array();
+        $this->stream[CRYPT_RC4_DECRYPT] = $this->stream[CRYPT_RC4_ENCRYPT] = array(
+            0, // index $i
+            0, // index $j
+            $keyStream
+        );
+    }
+
+    /**
+     * Encrypts or decrypts a message.
+     *
+     * @see self::encrypt()
+     * @see self::decrypt()
+     * @access private
+     * @param string $text
+     * @param int $mode
+     * @return string $text
+     */
+    function _crypt($text, $mode)
+    {
+        if ($this->changed) {
+            $this->_setup();
+            $this->changed = false;
+        }
+
+        $stream = &$this->stream[$mode];
+        if ($this->continuousBuffer) {
+            $i = &$stream[0];
+            $j = &$stream[1];
+            $keyStream = &$stream[2];
+        } else {
+            $i = $stream[0];
+            $j = $stream[1];
+            $keyStream = $stream[2];
+        }
+
+        $len = strlen($text);
+        for ($k = 0; $k < $len; ++$k) {
+            $i = ($i + 1) & 255;
+            $ksi = $keyStream[$i];
+            $j = ($j + $ksi) & 255;
+            $ksj = $keyStream[$j];
+
+            $keyStream[$i] = $ksj;
+            $keyStream[$j] = $ksi;
+            $text[$k] = $text[$k] ^ chr($keyStream[($ksj + $ksi) & 255]);
+        }
+
+        return $text;
+    }
+}
diff --git a/lib/php/phpseclib/Crypt/RSA.php b/lib/php/phpseclib/Crypt/RSA.php
new file mode 100644
index 00000000..358f3c32
--- /dev/null
+++ b/lib/php/phpseclib/Crypt/RSA.php
@@ -0,0 +1,3142 @@
+<?php
+
+/**
+ * Pure-PHP PKCS#1 (v2.1) compliant implementation of RSA.
+ *
+ * PHP versions 4 and 5
+ *
+ * Here's an example of how to encrypt and decrypt text with this library:
+ * <code>
+ * <?php
+ *    include 'Crypt/RSA.php';
+ *
+ *    $rsa = new Crypt_RSA();
+ *    extract($rsa->createKey());
+ *
+ *    $plaintext = 'terrafrost';
+ *
+ *    $rsa->loadKey($privatekey);
+ *    $ciphertext = $rsa->encrypt($plaintext);
+ *
+ *    $rsa->loadKey($publickey);
+ *    echo $rsa->decrypt($ciphertext);
+ * ?>
+ * </code>
+ *
+ * Here's an example of how to create signatures and verify signatures with this library:
+ * <code>
+ * <?php
+ *    include 'Crypt/RSA.php';
+ *
+ *    $rsa = new Crypt_RSA();
+ *    extract($rsa->createKey());
+ *
+ *    $plaintext = 'terrafrost';
+ *
+ *    $rsa->loadKey($privatekey);
+ *    $signature = $rsa->sign($plaintext);
+ *
+ *    $rsa->loadKey($publickey);
+ *    echo $rsa->verify($plaintext, $signature) ? 'verified' : 'unverified';
+ * ?>
+ * </code>
+ *
+ * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @category  Crypt
+ * @package   Crypt_RSA
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2009 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+/**
+ * Include Crypt_Random
+ */
+// the class_exists() will only be called if the crypt_random_string function hasn't been defined and
+// will trigger a call to __autoload() if you're wanting to auto-load classes
+// call function_exists() a second time to stop the include_once from being called outside
+// of the auto loader
+if (!function_exists('crypt_random_string')) {
+    include_once 'Random.php';
+}
+
+/**
+ * Include Crypt_Hash
+ */
+if (!class_exists('Crypt_Hash')) {
+    include_once 'Hash.php';
+}
+
+/**#@+
+ * @access public
+ * @see self::encrypt()
+ * @see self::decrypt()
+ */
+/**
+ * Use {@link http://en.wikipedia.org/wiki/Optimal_Asymmetric_Encryption_Padding Optimal Asymmetric Encryption Padding}
+ * (OAEP) for encryption / decryption.
+ *
+ * Uses sha1 by default.
+ *
+ * @see self::setHash()
+ * @see self::setMGFHash()
+ */
+define('CRYPT_RSA_ENCRYPTION_OAEP',  1);
+/**
+ * Use PKCS#1 padding.
+ *
+ * Although CRYPT_RSA_ENCRYPTION_OAEP offers more security, including PKCS#1 padding is necessary for purposes of backwards
+ * compatibility with protocols (like SSH-1) written before OAEP's introduction.
+ */
+define('CRYPT_RSA_ENCRYPTION_PKCS1', 2);
+/**
+ * Do not use any padding
+ *
+ * Although this method is not recommended it can none-the-less sometimes be useful if you're trying to decrypt some legacy
+ * stuff, if you're trying to diagnose why an encrypted message isn't decrypting, etc.
+ */
+define('CRYPT_RSA_ENCRYPTION_NONE', 3);
+/**#@-*/
+
+/**#@+
+ * @access public
+ * @see self::sign()
+ * @see self::verify()
+ * @see self::setHash()
+ */
+/**
+ * Use the Probabilistic Signature Scheme for signing
+ *
+ * Uses sha1 by default.
+ *
+ * @see self::setSaltLength()
+ * @see self::setMGFHash()
+ */
+define('CRYPT_RSA_SIGNATURE_PSS',  1);
+/**
+ * Use the PKCS#1 scheme by default.
+ *
+ * Although CRYPT_RSA_SIGNATURE_PSS offers more security, including PKCS#1 signing is necessary for purposes of backwards
+ * compatibility with protocols (like SSH-2) written before PSS's introduction.
+ */
+define('CRYPT_RSA_SIGNATURE_PKCS1', 2);
+/**#@-*/
+
+/**#@+
+ * @access private
+ * @see self::createKey()
+ */
+/**
+ * ASN1 Integer
+ */
+define('CRYPT_RSA_ASN1_INTEGER',     2);
+/**
+ * ASN1 Bit String
+ */
+define('CRYPT_RSA_ASN1_BITSTRING',   3);
+/**
+ * ASN1 Octet String
+ */
+define('CRYPT_RSA_ASN1_OCTETSTRING', 4);
+/**
+ * ASN1 Object Identifier
+ */
+define('CRYPT_RSA_ASN1_OBJECT',      6);
+/**
+ * ASN1 Sequence (with the constucted bit set)
+ */
+define('CRYPT_RSA_ASN1_SEQUENCE',   48);
+/**#@-*/
+
+/**#@+
+ * @access private
+ * @see self::Crypt_RSA()
+ */
+/**
+ * To use the pure-PHP implementation
+ */
+define('CRYPT_RSA_MODE_INTERNAL', 1);
+/**
+ * To use the OpenSSL library
+ *
+ * (if enabled; otherwise, the internal implementation will be used)
+ */
+define('CRYPT_RSA_MODE_OPENSSL', 2);
+/**#@-*/
+
+/**
+ * Default openSSL configuration file.
+ */
+define('CRYPT_RSA_OPENSSL_CONFIG', dirname(__FILE__) . '/../openssl.cnf');
+
+/**#@+
+ * @access public
+ * @see self::createKey()
+ * @see self::setPrivateKeyFormat()
+ */
+/**
+ * PKCS#1 formatted private key
+ *
+ * Used by OpenSSH
+ */
+define('CRYPT_RSA_PRIVATE_FORMAT_PKCS1', 0);
+/**
+ * PuTTY formatted private key
+ */
+define('CRYPT_RSA_PRIVATE_FORMAT_PUTTY', 1);
+/**
+ * XML formatted private key
+ */
+define('CRYPT_RSA_PRIVATE_FORMAT_XML', 2);
+/**
+ * PKCS#8 formatted private key
+ */
+define('CRYPT_RSA_PRIVATE_FORMAT_PKCS8', 8);
+/**#@-*/
+
+/**#@+
+ * @access public
+ * @see self::createKey()
+ * @see self::setPublicKeyFormat()
+ */
+/**
+ * Raw public key
+ *
+ * An array containing two Math_BigInteger objects.
+ *
+ * The exponent can be indexed with any of the following:
+ *
+ * 0, e, exponent, publicExponent
+ *
+ * The modulus can be indexed with any of the following:
+ *
+ * 1, n, modulo, modulus
+ */
+define('CRYPT_RSA_PUBLIC_FORMAT_RAW', 3);
+/**
+ * PKCS#1 formatted public key (raw)
+ *
+ * Used by File/X509.php
+ *
+ * Has the following header:
+ *
+ * -----BEGIN RSA PUBLIC KEY-----
+ *
+ * Analogous to ssh-keygen's pem format (as specified by -m)
+ */
+define('CRYPT_RSA_PUBLIC_FORMAT_PKCS1', 4);
+define('CRYPT_RSA_PUBLIC_FORMAT_PKCS1_RAW', 4);
+/**
+ * XML formatted public key
+ */
+define('CRYPT_RSA_PUBLIC_FORMAT_XML', 5);
+/**
+ * OpenSSH formatted public key
+ *
+ * Place in $HOME/.ssh/authorized_keys
+ */
+define('CRYPT_RSA_PUBLIC_FORMAT_OPENSSH', 6);
+/**
+ * PKCS#1 formatted public key (encapsulated)
+ *
+ * Used by PHP's openssl_public_encrypt() and openssl's rsautl (when -pubin is set)
+ *
+ * Has the following header:
+ *
+ * -----BEGIN PUBLIC KEY-----
+ *
+ * Analogous to ssh-keygen's pkcs8 format (as specified by -m). Although PKCS8
+ * is specific to private keys it's basically creating a DER-encoded wrapper
+ * for keys. This just extends that same concept to public keys (much like ssh-keygen)
+ */
+define('CRYPT_RSA_PUBLIC_FORMAT_PKCS8', 7);
+/**#@-*/
+
+/**
+ * Pure-PHP PKCS#1 compliant implementation of RSA.
+ *
+ * @package Crypt_RSA
+ * @author  Jim Wigginton <terrafrost@php.net>
+ * @access  public
+ */
+class Crypt_RSA
+{
+    /**
+     * Precomputed Zero
+     *
+     * @var Math_BigInteger
+     * @access private
+     */
+    var $zero;
+
+    /**
+     * Precomputed One
+     *
+     * @var Math_BigInteger
+     * @access private
+     */
+    var $one;
+
+    /**
+     * Private Key Format
+     *
+     * @var int
+     * @access private
+     */
+    var $privateKeyFormat = CRYPT_RSA_PRIVATE_FORMAT_PKCS1;
+
+    /**
+     * Public Key Format
+     *
+     * @var int
+     * @access public
+     */
+    var $publicKeyFormat = CRYPT_RSA_PUBLIC_FORMAT_PKCS8;
+
+    /**
+     * Modulus (ie. n)
+     *
+     * @var Math_BigInteger
+     * @access private
+     */
+    var $modulus;
+
+    /**
+     * Modulus length
+     *
+     * @var Math_BigInteger
+     * @access private
+     */
+    var $k;
+
+    /**
+     * Exponent (ie. e or d)
+     *
+     * @var Math_BigInteger
+     * @access private
+     */
+    var $exponent;
+
+    /**
+     * Primes for Chinese Remainder Theorem (ie. p and q)
+     *
+     * @var array
+     * @access private
+     */
+    var $primes;
+
+    /**
+     * Exponents for Chinese Remainder Theorem (ie. dP and dQ)
+     *
+     * @var array
+     * @access private
+     */
+    var $exponents;
+
+    /**
+     * Coefficients for Chinese Remainder Theorem (ie. qInv)
+     *
+     * @var array
+     * @access private
+     */
+    var $coefficients;
+
+    /**
+     * Hash name
+     *
+     * @var string
+     * @access private
+     */
+    var $hashName;
+
+    /**
+     * Hash function
+     *
+     * @var Crypt_Hash
+     * @access private
+     */
+    var $hash;
+
+    /**
+     * Length of hash function output
+     *
+     * @var int
+     * @access private
+     */
+    var $hLen;
+
+    /**
+     * Length of salt
+     *
+     * @var int
+     * @access private
+     */
+    var $sLen;
+
+    /**
+     * Hash function for the Mask Generation Function
+     *
+     * @var Crypt_Hash
+     * @access private
+     */
+    var $mgfHash;
+
+    /**
+     * Length of MGF hash function output
+     *
+     * @var int
+     * @access private
+     */
+    var $mgfHLen;
+
+    /**
+     * Encryption mode
+     *
+     * @var int
+     * @access private
+     */
+    var $encryptionMode = CRYPT_RSA_ENCRYPTION_OAEP;
+
+    /**
+     * Signature mode
+     *
+     * @var int
+     * @access private
+     */
+    var $signatureMode = CRYPT_RSA_SIGNATURE_PSS;
+
+    /**
+     * Public Exponent
+     *
+     * @var mixed
+     * @access private
+     */
+    var $publicExponent = false;
+
+    /**
+     * Password
+     *
+     * @var string
+     * @access private
+     */
+    var $password = false;
+
+    /**
+     * Components
+     *
+     * For use with parsing XML formatted keys.  PHP's XML Parser functions use utilized - instead of PHP's DOM functions -
+     * because PHP's XML Parser functions work on PHP4 whereas PHP's DOM functions - although surperior - don't.
+     *
+     * @see self::_start_element_handler()
+     * @var array
+     * @access private
+     */
+    var $components = array();
+
+    /**
+     * Current String
+     *
+     * For use with parsing XML formatted keys.
+     *
+     * @see self::_character_handler()
+     * @see self::_stop_element_handler()
+     * @var mixed
+     * @access private
+     */
+    var $current;
+
+    /**
+     * OpenSSL configuration file name.
+     *
+     * Set to null to use system configuration file.
+     * @see self::createKey()
+     * @var mixed
+     * @Access public
+     */
+    var $configFile;
+
+    /**
+     * Public key comment field.
+     *
+     * @var string
+     * @access private
+     */
+    var $comment = 'phpseclib-generated-key';
+
+    /**
+     * The constructor
+     *
+     * If you want to make use of the openssl extension, you'll need to set the mode manually, yourself.  The reason
+     * Crypt_RSA doesn't do it is because OpenSSL doesn't fail gracefully.  openssl_pkey_new(), in particular, requires
+     * openssl.cnf be present somewhere and, unfortunately, the only real way to find out is too late.
+     *
+     * @return Crypt_RSA
+     * @access public
+     */
+    function __construct()
+    {
+        if (!class_exists('Math_BigInteger')) {
+            include_once 'Math/BigInteger.php';
+        }
+
+        $this->configFile = CRYPT_RSA_OPENSSL_CONFIG;
+
+        if (!defined('CRYPT_RSA_MODE')) {
+            switch (true) {
+                // Math/BigInteger's openssl requirements are a little less stringent than Crypt/RSA's. in particular,
+                // Math/BigInteger doesn't require an openssl.cfg file whereas Crypt/RSA does. so if Math/BigInteger
+                // can't use OpenSSL it can be pretty trivially assumed, then, that Crypt/RSA can't either.
+                case defined('MATH_BIGINTEGER_OPENSSL_DISABLE'):
+                    define('CRYPT_RSA_MODE', CRYPT_RSA_MODE_INTERNAL);
+                    break;
+                // openssl_pkey_get_details - which is used in the only place Crypt/RSA.php uses OpenSSL - was introduced in PHP 5.2.0
+                case !function_exists('openssl_pkey_get_details'):
+                    define('CRYPT_RSA_MODE', CRYPT_RSA_MODE_INTERNAL);
+                    break;
+                case extension_loaded('openssl') && version_compare(PHP_VERSION, '4.2.0', '>=') && file_exists($this->configFile):
+                    // some versions of XAMPP have mismatched versions of OpenSSL which causes it not to work
+                    ob_start();
+                    @phpinfo();
+                    $content = ob_get_contents();
+                    ob_end_clean();
+
+                    preg_match_all('#OpenSSL (Header|Library) Version(.*)#im', $content, $matches);
+
+                    $versions = array();
+                    if (!empty($matches[1])) {
+                        for ($i = 0; $i < count($matches[1]); $i++) {
+                            $fullVersion = trim(str_replace('=>', '', strip_tags($matches[2][$i])));
+
+                            // Remove letter part in OpenSSL version
+                            if (!preg_match('/(\d+\.\d+\.\d+)/i', $fullVersion, $m)) {
+                                $versions[$matches[1][$i]] = $fullVersion;
+                            } else {
+                                $versions[$matches[1][$i]] = $m[0];
+                            }
+                        }
+                    }
+
+                    // it doesn't appear that OpenSSL versions were reported upon until PHP 5.3+
+                    switch (true) {
+                        case !isset($versions['Header']):
+                        case !isset($versions['Library']):
+                        case $versions['Header'] == $versions['Library']:
+                        case version_compare($versions['Header'], '1.0.0') >= 0 && version_compare($versions['Library'], '1.0.0') >= 0:
+                            define('CRYPT_RSA_MODE', CRYPT_RSA_MODE_OPENSSL);
+                            break;
+                        default:
+                            define('CRYPT_RSA_MODE', CRYPT_RSA_MODE_INTERNAL);
+                            define('MATH_BIGINTEGER_OPENSSL_DISABLE', true);
+                    }
+                    break;
+                default:
+                    define('CRYPT_RSA_MODE', CRYPT_RSA_MODE_INTERNAL);
+            }
+        }
+
+        $this->zero = new Math_BigInteger();
+        $this->one = new Math_BigInteger(1);
+
+        $this->hash = new Crypt_Hash('sha1');
+        $this->hLen = $this->hash->getLength();
+        $this->hashName = 'sha1';
+        $this->mgfHash = new Crypt_Hash('sha1');
+        $this->mgfHLen = $this->mgfHash->getLength();
+    }
+
+    /**
+     * PHP4 compatible Default Constructor.
+     *
+     * @see self::__construct()
+     * @access public
+     */
+    function Crypt_RSA()
+    {
+        $this->__construct();
+    }
+
+    /**
+     * Create public / private key pair
+     *
+     * Returns an array with the following three elements:
+     *  - 'privatekey': The private key.
+     *  - 'publickey':  The public key.
+     *  - 'partialkey': A partially computed key (if the execution time exceeded $timeout).
+     *                  Will need to be passed back to Crypt_RSA::createKey() as the third parameter for further processing.
+     *
+     * @access public
+     * @param int $bits
+     * @param int $timeout
+     * @param Math_BigInteger $p
+     */
+    function createKey($bits = 1024, $timeout = false, $partial = array())
+    {
+        if (!defined('CRYPT_RSA_EXPONENT')) {
+            // http://en.wikipedia.org/wiki/65537_%28number%29
+            define('CRYPT_RSA_EXPONENT', '65537');
+        }
+        // per <http://cseweb.ucsd.edu/~hovav/dist/survey.pdf#page=5>, this number ought not result in primes smaller
+        // than 256 bits. as a consequence if the key you're trying to create is 1024 bits and you've set CRYPT_RSA_SMALLEST_PRIME
+        // to 384 bits then you're going to get a 384 bit prime and a 640 bit prime (384 + 1024 % 384). at least if
+        // CRYPT_RSA_MODE is set to CRYPT_RSA_MODE_INTERNAL. if CRYPT_RSA_MODE is set to CRYPT_RSA_MODE_OPENSSL then
+        // CRYPT_RSA_SMALLEST_PRIME is ignored (ie. multi-prime RSA support is more intended as a way to speed up RSA key
+        // generation when there's a chance neither gmp nor OpenSSL are installed)
+        if (!defined('CRYPT_RSA_SMALLEST_PRIME')) {
+            define('CRYPT_RSA_SMALLEST_PRIME', 4096);
+        }
+
+        // OpenSSL uses 65537 as the exponent and requires RSA keys be 384 bits minimum
+        if (CRYPT_RSA_MODE == CRYPT_RSA_MODE_OPENSSL && $bits >= 384 && CRYPT_RSA_EXPONENT == 65537) {
+            $config = array();
+            if (isset($this->configFile)) {
+                $config['config'] = $this->configFile;
+            }
+            $rsa = openssl_pkey_new(array('private_key_bits' => $bits) + $config);
+            openssl_pkey_export($rsa, $privatekey, null, $config);
+            $publickey = openssl_pkey_get_details($rsa);
+            $publickey = $publickey['key'];
+
+            $privatekey = call_user_func_array(array($this, '_convertPrivateKey'), array_values($this->_parseKey($privatekey, CRYPT_RSA_PRIVATE_FORMAT_PKCS1)));
+            $publickey = call_user_func_array(array($this, '_convertPublicKey'), array_values($this->_parseKey($publickey, CRYPT_RSA_PUBLIC_FORMAT_PKCS1)));
+
+            // clear the buffer of error strings stemming from a minimalistic openssl.cnf
+            while (openssl_error_string() !== false) {
+            }
+
+            return array(
+                'privatekey' => $privatekey,
+                'publickey' => $publickey,
+                'partialkey' => false
+            );
+        }
+
+        static $e;
+        if (!isset($e)) {
+            $e = new Math_BigInteger(CRYPT_RSA_EXPONENT);
+        }
+
+        extract($this->_generateMinMax($bits));
+        $absoluteMin = $min;
+        $temp = $bits >> 1; // divide by two to see how many bits P and Q would be
+        if ($temp > CRYPT_RSA_SMALLEST_PRIME) {
+            $num_primes = floor($bits / CRYPT_RSA_SMALLEST_PRIME);
+            $temp = CRYPT_RSA_SMALLEST_PRIME;
+        } else {
+            $num_primes = 2;
+        }
+        extract($this->_generateMinMax($temp + $bits % $temp));
+        $finalMax = $max;
+        extract($this->_generateMinMax($temp));
+
+        $generator = new Math_BigInteger();
+
+        $n = $this->one->copy();
+        if (!empty($partial)) {
+            extract(unserialize($partial));
+        } else {
+            $exponents = $coefficients = $primes = array();
+            $lcm = array(
+                'top' => $this->one->copy(),
+                'bottom' => false
+            );
+        }
+
+        $start = time();
+        $i0 = count($primes) + 1;
+
+        do {
+            for ($i = $i0; $i <= $num_primes; $i++) {
+                if ($timeout !== false) {
+                    $timeout-= time() - $start;
+                    $start = time();
+                    if ($timeout <= 0) {
+                        return array(
+                            'privatekey' => '',
+                            'publickey'  => '',
+                            'partialkey' => serialize(array(
+                                'primes' => $primes,
+                                'coefficients' => $coefficients,
+                                'lcm' => $lcm,
+                                'exponents' => $exponents
+                            ))
+                        );
+                    }
+                }
+
+                if ($i == $num_primes) {
+                    list($min, $temp) = $absoluteMin->divide($n);
+                    if (!$temp->equals($this->zero)) {
+                        $min = $min->add($this->one); // ie. ceil()
+                    }
+                    $primes[$i] = $generator->randomPrime($min, $finalMax, $timeout);
+                } else {
+                    $primes[$i] = $generator->randomPrime($min, $max, $timeout);
+                }
+
+                if ($primes[$i] === false) { // if we've reached the timeout
+                    if (count($primes) > 1) {
+                        $partialkey = '';
+                    } else {
+                        array_pop($primes);
+                        $partialkey = serialize(array(
+                            'primes' => $primes,
+                            'coefficients' => $coefficients,
+                            'lcm' => $lcm,
+                            'exponents' => $exponents
+                        ));
+                    }
+
+                    return array(
+                        'privatekey' => '',
+                        'publickey'  => '',
+                        'partialkey' => $partialkey
+                    );
+                }
+
+                // the first coefficient is calculated differently from the rest
+                // ie. instead of being $primes[1]->modInverse($primes[2]), it's $primes[2]->modInverse($primes[1])
+                if ($i > 2) {
+                    $coefficients[$i] = $n->modInverse($primes[$i]);
+                }
+
+                $n = $n->multiply($primes[$i]);
+
+                $temp = $primes[$i]->subtract($this->one);
+
+                // textbook RSA implementations use Euler's totient function instead of the least common multiple.
+                // see http://en.wikipedia.org/wiki/Euler%27s_totient_function
+                $lcm['top'] = $lcm['top']->multiply($temp);
+                $lcm['bottom'] = $lcm['bottom'] === false ? $temp : $lcm['bottom']->gcd($temp);
+
+                $exponents[$i] = $e->modInverse($temp);
+            }
+
+            list($temp) = $lcm['top']->divide($lcm['bottom']);
+            $gcd = $temp->gcd($e);
+            $i0 = 1;
+        } while (!$gcd->equals($this->one));
+
+        $d = $e->modInverse($temp);
+
+        $coefficients[2] = $primes[2]->modInverse($primes[1]);
+
+        // from <http://tools.ietf.org/html/rfc3447#appendix-A.1.2>:
+        // RSAPrivateKey ::= SEQUENCE {
+        //     version           Version,
+        //     modulus           INTEGER,  -- n
+        //     publicExponent    INTEGER,  -- e
+        //     privateExponent   INTEGER,  -- d
+        //     prime1            INTEGER,  -- p
+        //     prime2            INTEGER,  -- q
+        //     exponent1         INTEGER,  -- d mod (p-1)
+        //     exponent2         INTEGER,  -- d mod (q-1)
+        //     coefficient       INTEGER,  -- (inverse of q) mod p
+        //     otherPrimeInfos   OtherPrimeInfos OPTIONAL
+        // }
+
+        return array(
+            'privatekey' => $this->_convertPrivateKey($n, $e, $d, $primes, $exponents, $coefficients),
+            'publickey'  => $this->_convertPublicKey($n, $e),
+            'partialkey' => false
+        );
+    }
+
+    /**
+     * Convert a private key to the appropriate format.
+     *
+     * @access private
+     * @see self::setPrivateKeyFormat()
+     * @param string $RSAPrivateKey
+     * @return string
+     */
+    function _convertPrivateKey($n, $e, $d, $primes, $exponents, $coefficients)
+    {
+        $signed = $this->privateKeyFormat != CRYPT_RSA_PRIVATE_FORMAT_XML;
+        $num_primes = count($primes);
+        $raw = array(
+            'version' => $num_primes == 2 ? chr(0) : chr(1), // two-prime vs. multi
+            'modulus' => $n->toBytes($signed),
+            'publicExponent' => $e->toBytes($signed),
+            'privateExponent' => $d->toBytes($signed),
+            'prime1' => $primes[1]->toBytes($signed),
+            'prime2' => $primes[2]->toBytes($signed),
+            'exponent1' => $exponents[1]->toBytes($signed),
+            'exponent2' => $exponents[2]->toBytes($signed),
+            'coefficient' => $coefficients[2]->toBytes($signed)
+        );
+
+        // if the format in question does not support multi-prime rsa and multi-prime rsa was used,
+        // call _convertPublicKey() instead.
+        switch ($this->privateKeyFormat) {
+            case CRYPT_RSA_PRIVATE_FORMAT_XML:
+                if ($num_primes != 2) {
+                    return false;
+                }
+                return "<RSAKeyValue>\r\n" .
+                       '  <Modulus>' . base64_encode($raw['modulus']) . "</Modulus>\r\n" .
+                       '  <Exponent>' . base64_encode($raw['publicExponent']) . "</Exponent>\r\n" .
+                       '  <P>' . base64_encode($raw['prime1']) . "</P>\r\n" .
+                       '  <Q>' . base64_encode($raw['prime2']) . "</Q>\r\n" .
+                       '  <DP>' . base64_encode($raw['exponent1']) . "</DP>\r\n" .
+                       '  <DQ>' . base64_encode($raw['exponent2']) . "</DQ>\r\n" .
+                       '  <InverseQ>' . base64_encode($raw['coefficient']) . "</InverseQ>\r\n" .
+                       '  <D>' . base64_encode($raw['privateExponent']) . "</D>\r\n" .
+                       '</RSAKeyValue>';
+                break;
+            case CRYPT_RSA_PRIVATE_FORMAT_PUTTY:
+                if ($num_primes != 2) {
+                    return false;
+                }
+                $key = "PuTTY-User-Key-File-2: ssh-rsa\r\nEncryption: ";
+                $encryption = (!empty($this->password) || is_string($this->password)) ? 'aes256-cbc' : 'none';
+                $key.= $encryption;
+                $key.= "\r\nComment: " . $this->comment . "\r\n";
+                $public = pack(
+                    'Na*Na*Na*',
+                    strlen('ssh-rsa'),
+                    'ssh-rsa',
+                    strlen($raw['publicExponent']),
+                    $raw['publicExponent'],
+                    strlen($raw['modulus']),
+                    $raw['modulus']
+                );
+                $source = pack(
+                    'Na*Na*Na*Na*',
+                    strlen('ssh-rsa'),
+                    'ssh-rsa',
+                    strlen($encryption),
+                    $encryption,
+                    strlen($this->comment),
+                    $this->comment,
+                    strlen($public),
+                    $public
+                );
+                $public = base64_encode($public);
+                $key.= "Public-Lines: " . ((strlen($public) + 63) >> 6) . "\r\n";
+                $key.= chunk_split($public, 64);
+                $private = pack(
+                    'Na*Na*Na*Na*',
+                    strlen($raw['privateExponent']),
+                    $raw['privateExponent'],
+                    strlen($raw['prime1']),
+                    $raw['prime1'],
+                    strlen($raw['prime2']),
+                    $raw['prime2'],
+                    strlen($raw['coefficient']),
+                    $raw['coefficient']
+                );
+                if (empty($this->password) && !is_string($this->password)) {
+                    $source.= pack('Na*', strlen($private), $private);
+                    $hashkey = 'putty-private-key-file-mac-key';
+                } else {
+                    $private.= crypt_random_string(16 - (strlen($private) & 15));
+                    $source.= pack('Na*', strlen($private), $private);
+                    if (!class_exists('Crypt_AES')) {
+                        include_once 'Crypt/AES.php';
+                    }
+                    $sequence = 0;
+                    $symkey = '';
+                    while (strlen($symkey) < 32) {
+                        $temp = pack('Na*', $sequence++, $this->password);
+                        $symkey.= pack('H*', sha1($temp));
+                    }
+                    $symkey = substr($symkey, 0, 32);
+                    $crypto = new Crypt_AES();
+
+                    $crypto->setKey($symkey);
+                    $crypto->disablePadding();
+                    $private = $crypto->encrypt($private);
+                    $hashkey = 'putty-private-key-file-mac-key' . $this->password;
+                }
+
+                $private = base64_encode($private);
+                $key.= 'Private-Lines: ' . ((strlen($private) + 63) >> 6) . "\r\n";
+                $key.= chunk_split($private, 64);
+                if (!class_exists('Crypt_Hash')) {
+                    include_once 'Crypt/Hash.php';
+                }
+                $hash = new Crypt_Hash('sha1');
+                $hash->setKey(pack('H*', sha1($hashkey)));
+                $key.= 'Private-MAC: ' . bin2hex($hash->hash($source)) . "\r\n";
+
+                return $key;
+            default: // eg. CRYPT_RSA_PRIVATE_FORMAT_PKCS1
+                $components = array();
+                foreach ($raw as $name => $value) {
+                    $components[$name] = pack('Ca*a*', CRYPT_RSA_ASN1_INTEGER, $this->_encodeLength(strlen($value)), $value);
+                }
+
+                $RSAPrivateKey = implode('', $components);
+
+                if ($num_primes > 2) {
+                    $OtherPrimeInfos = '';
+                    for ($i = 3; $i <= $num_primes; $i++) {
+                        // OtherPrimeInfos ::= SEQUENCE SIZE(1..MAX) OF OtherPrimeInfo
+                        //
+                        // OtherPrimeInfo ::= SEQUENCE {
+                        //     prime             INTEGER,  -- ri
+                        //     exponent          INTEGER,  -- di
+                        //     coefficient       INTEGER   -- ti
+                        // }
+                        $OtherPrimeInfo = pack('Ca*a*', CRYPT_RSA_ASN1_INTEGER, $this->_encodeLength(strlen($primes[$i]->toBytes(true))), $primes[$i]->toBytes(true));
+                        $OtherPrimeInfo.= pack('Ca*a*', CRYPT_RSA_ASN1_INTEGER, $this->_encodeLength(strlen($exponents[$i]->toBytes(true))), $exponents[$i]->toBytes(true));
+                        $OtherPrimeInfo.= pack('Ca*a*', CRYPT_RSA_ASN1_INTEGER, $this->_encodeLength(strlen($coefficients[$i]->toBytes(true))), $coefficients[$i]->toBytes(true));
+                        $OtherPrimeInfos.= pack('Ca*a*', CRYPT_RSA_ASN1_SEQUENCE, $this->_encodeLength(strlen($OtherPrimeInfo)), $OtherPrimeInfo);
+                    }
+                    $RSAPrivateKey.= pack('Ca*a*', CRYPT_RSA_ASN1_SEQUENCE, $this->_encodeLength(strlen($OtherPrimeInfos)), $OtherPrimeInfos);
+                }
+
+                $RSAPrivateKey = pack('Ca*a*', CRYPT_RSA_ASN1_SEQUENCE, $this->_encodeLength(strlen($RSAPrivateKey)), $RSAPrivateKey);
+
+                if ($this->privateKeyFormat == CRYPT_RSA_PRIVATE_FORMAT_PKCS8) {
+                    $rsaOID = pack('H*', '300d06092a864886f70d0101010500'); // hex version of MA0GCSqGSIb3DQEBAQUA
+                    $RSAPrivateKey = pack(
+                        'Ca*a*Ca*a*',
+                        CRYPT_RSA_ASN1_INTEGER,
+                        "\01\00",
+                        $rsaOID,
+                        4,
+                        $this->_encodeLength(strlen($RSAPrivateKey)),
+                        $RSAPrivateKey
+                    );
+                    $RSAPrivateKey = pack('Ca*a*', CRYPT_RSA_ASN1_SEQUENCE, $this->_encodeLength(strlen($RSAPrivateKey)), $RSAPrivateKey);
+                    if (!empty($this->password) || is_string($this->password)) {
+                        $salt = crypt_random_string(8);
+                        $iterationCount = 2048;
+
+                        if (!class_exists('Crypt_DES')) {
+                            include_once 'Crypt/DES.php';
+                        }
+                        $crypto = new Crypt_DES();
+                        $crypto->setPassword($this->password, 'pbkdf1', 'md5', $salt, $iterationCount);
+                        $RSAPrivateKey = $crypto->encrypt($RSAPrivateKey);
+
+                        $parameters = pack(
+                            'Ca*a*Ca*N',
+                            CRYPT_RSA_ASN1_OCTETSTRING,
+                            $this->_encodeLength(strlen($salt)),
+                            $salt,
+                            CRYPT_RSA_ASN1_INTEGER,
+                            $this->_encodeLength(4),
+                            $iterationCount
+                        );
+                        $pbeWithMD5AndDES_CBC = "\x2a\x86\x48\x86\xf7\x0d\x01\x05\x03";
+
+                        $encryptionAlgorithm = pack(
+                            'Ca*a*Ca*a*',
+                            CRYPT_RSA_ASN1_OBJECT,
+                            $this->_encodeLength(strlen($pbeWithMD5AndDES_CBC)),
+                            $pbeWithMD5AndDES_CBC,
+                            CRYPT_RSA_ASN1_SEQUENCE,
+                            $this->_encodeLength(strlen($parameters)),
+                            $parameters
+                        );
+
+                        $RSAPrivateKey = pack(
+                            'Ca*a*Ca*a*',
+                            CRYPT_RSA_ASN1_SEQUENCE,
+                            $this->_encodeLength(strlen($encryptionAlgorithm)),
+                            $encryptionAlgorithm,
+                            CRYPT_RSA_ASN1_OCTETSTRING,
+                            $this->_encodeLength(strlen($RSAPrivateKey)),
+                            $RSAPrivateKey
+                        );
+
+                        $RSAPrivateKey = pack('Ca*a*', CRYPT_RSA_ASN1_SEQUENCE, $this->_encodeLength(strlen($RSAPrivateKey)), $RSAPrivateKey);
+
+                        $RSAPrivateKey = "-----BEGIN ENCRYPTED PRIVATE KEY-----\r\n" .
+                                         chunk_split(base64_encode($RSAPrivateKey), 64) .
+                                         '-----END ENCRYPTED PRIVATE KEY-----';
+                    } else {
+                        $RSAPrivateKey = "-----BEGIN PRIVATE KEY-----\r\n" .
+                                         chunk_split(base64_encode($RSAPrivateKey), 64) .
+                                         '-----END PRIVATE KEY-----';
+                    }
+                    return $RSAPrivateKey;
+                }
+
+                if (!empty($this->password) || is_string($this->password)) {
+                    $iv = crypt_random_string(8);
+                    $symkey = pack('H*', md5($this->password . $iv)); // symkey is short for symmetric key
+                    $symkey.= substr(pack('H*', md5($symkey . $this->password . $iv)), 0, 8);
+                    if (!class_exists('Crypt_TripleDES')) {
+                        include_once 'Crypt/TripleDES.php';
+                    }
+                    $des = new Crypt_TripleDES();
+                    $des->setKey($symkey);
+                    $des->setIV($iv);
+                    $iv = strtoupper(bin2hex($iv));
+                    $RSAPrivateKey = "-----BEGIN RSA PRIVATE KEY-----\r\n" .
+                                     "Proc-Type: 4,ENCRYPTED\r\n" .
+                                     "DEK-Info: DES-EDE3-CBC,$iv\r\n" .
+                                     "\r\n" .
+                                     chunk_split(base64_encode($des->encrypt($RSAPrivateKey)), 64) .
+                                     '-----END RSA PRIVATE KEY-----';
+                } else {
+                    $RSAPrivateKey = "-----BEGIN RSA PRIVATE KEY-----\r\n" .
+                                     chunk_split(base64_encode($RSAPrivateKey), 64) .
+                                     '-----END RSA PRIVATE KEY-----';
+                }
+
+                return $RSAPrivateKey;
+        }
+    }
+
+    /**
+     * Convert a public key to the appropriate format
+     *
+     * @access private
+     * @see self::setPublicKeyFormat()
+     * @param string $RSAPrivateKey
+     * @return string
+     */
+    function _convertPublicKey($n, $e)
+    {
+        $signed = $this->publicKeyFormat != CRYPT_RSA_PUBLIC_FORMAT_XML;
+
+        $modulus = $n->toBytes($signed);
+        $publicExponent = $e->toBytes($signed);
+
+        switch ($this->publicKeyFormat) {
+            case CRYPT_RSA_PUBLIC_FORMAT_RAW:
+                return array('e' => $e->copy(), 'n' => $n->copy());
+            case CRYPT_RSA_PUBLIC_FORMAT_XML:
+                return "<RSAKeyValue>\r\n" .
+                       '  <Modulus>' . base64_encode($modulus) . "</Modulus>\r\n" .
+                       '  <Exponent>' . base64_encode($publicExponent) . "</Exponent>\r\n" .
+                       '</RSAKeyValue>';
+                break;
+            case CRYPT_RSA_PUBLIC_FORMAT_OPENSSH:
+                // from <http://tools.ietf.org/html/rfc4253#page-15>:
+                // string    "ssh-rsa"
+                // mpint     e
+                // mpint     n
+                $RSAPublicKey = pack('Na*Na*Na*', strlen('ssh-rsa'), 'ssh-rsa', strlen($publicExponent), $publicExponent, strlen($modulus), $modulus);
+                $RSAPublicKey = 'ssh-rsa ' . base64_encode($RSAPublicKey) . ' ' . $this->comment;
+
+                return $RSAPublicKey;
+            default: // eg. CRYPT_RSA_PUBLIC_FORMAT_PKCS1_RAW or CRYPT_RSA_PUBLIC_FORMAT_PKCS1
+                // from <http://tools.ietf.org/html/rfc3447#appendix-A.1.1>:
+                // RSAPublicKey ::= SEQUENCE {
+                //     modulus           INTEGER,  -- n
+                //     publicExponent    INTEGER   -- e
+                // }
+                $components = array(
+                    'modulus' => pack('Ca*a*', CRYPT_RSA_ASN1_INTEGER, $this->_encodeLength(strlen($modulus)), $modulus),
+                    'publicExponent' => pack('Ca*a*', CRYPT_RSA_ASN1_INTEGER, $this->_encodeLength(strlen($publicExponent)), $publicExponent)
+                );
+
+                $RSAPublicKey = pack(
+                    'Ca*a*a*',
+                    CRYPT_RSA_ASN1_SEQUENCE,
+                    $this->_encodeLength(strlen($components['modulus']) + strlen($components['publicExponent'])),
+                    $components['modulus'],
+                    $components['publicExponent']
+                );
+
+                if ($this->publicKeyFormat == CRYPT_RSA_PUBLIC_FORMAT_PKCS1_RAW) {
+                    $RSAPublicKey = "-----BEGIN RSA PUBLIC KEY-----\r\n" .
+                                    chunk_split(base64_encode($RSAPublicKey), 64) .
+                                    '-----END RSA PUBLIC KEY-----';
+                } else {
+                    // sequence(oid(1.2.840.113549.1.1.1), null)) = rsaEncryption.
+                    $rsaOID = pack('H*', '300d06092a864886f70d0101010500'); // hex version of MA0GCSqGSIb3DQEBAQUA
+                    $RSAPublicKey = chr(0) . $RSAPublicKey;
+                    $RSAPublicKey = chr(3) . $this->_encodeLength(strlen($RSAPublicKey)) . $RSAPublicKey;
+
+                    $RSAPublicKey = pack(
+                        'Ca*a*',
+                        CRYPT_RSA_ASN1_SEQUENCE,
+                        $this->_encodeLength(strlen($rsaOID . $RSAPublicKey)),
+                        $rsaOID . $RSAPublicKey
+                    );
+
+                    $RSAPublicKey = "-----BEGIN PUBLIC KEY-----\r\n" .
+                                     chunk_split(base64_encode($RSAPublicKey), 64) .
+                                     '-----END PUBLIC KEY-----';
+                }
+
+                return $RSAPublicKey;
+        }
+    }
+
+    /**
+     * Break a public or private key down into its constituant components
+     *
+     * @access private
+     * @see self::_convertPublicKey()
+     * @see self::_convertPrivateKey()
+     * @param string $key
+     * @param int $type
+     * @return array
+     */
+    function _parseKey($key, $type)
+    {
+        if ($type != CRYPT_RSA_PUBLIC_FORMAT_RAW && !is_string($key)) {
+            return false;
+        }
+
+        switch ($type) {
+            case CRYPT_RSA_PUBLIC_FORMAT_RAW:
+                if (!is_array($key)) {
+                    return false;
+                }
+                $components = array();
+                switch (true) {
+                    case isset($key['e']):
+                        $components['publicExponent'] = $key['e']->copy();
+                        break;
+                    case isset($key['exponent']):
+                        $components['publicExponent'] = $key['exponent']->copy();
+                        break;
+                    case isset($key['publicExponent']):
+                        $components['publicExponent'] = $key['publicExponent']->copy();
+                        break;
+                    case isset($key[0]):
+                        $components['publicExponent'] = $key[0]->copy();
+                }
+                switch (true) {
+                    case isset($key['n']):
+                        $components['modulus'] = $key['n']->copy();
+                        break;
+                    case isset($key['modulo']):
+                        $components['modulus'] = $key['modulo']->copy();
+                        break;
+                    case isset($key['modulus']):
+                        $components['modulus'] = $key['modulus']->copy();
+                        break;
+                    case isset($key[1]):
+                        $components['modulus'] = $key[1]->copy();
+                }
+                return isset($components['modulus']) && isset($components['publicExponent']) ? $components : false;
+            case CRYPT_RSA_PRIVATE_FORMAT_PKCS1:
+            case CRYPT_RSA_PRIVATE_FORMAT_PKCS8:
+            case CRYPT_RSA_PUBLIC_FORMAT_PKCS1:
+                /* Although PKCS#1 proposes a format that public and private keys can use, encrypting them is
+                   "outside the scope" of PKCS#1.  PKCS#1 then refers you to PKCS#12 and PKCS#15 if you're wanting to
+                   protect private keys, however, that's not what OpenSSL* does.  OpenSSL protects private keys by adding
+                   two new "fields" to the key - DEK-Info and Proc-Type.  These fields are discussed here:
+
+                   http://tools.ietf.org/html/rfc1421#section-4.6.1.1
+                   http://tools.ietf.org/html/rfc1421#section-4.6.1.3
+
+                   DES-EDE3-CBC as an algorithm, however, is not discussed anywhere, near as I can tell.
+                   DES-CBC and DES-EDE are discussed in RFC1423, however, DES-EDE3-CBC isn't, nor is its key derivation
+                   function.  As is, the definitive authority on this encoding scheme isn't the IETF but rather OpenSSL's
+                   own implementation.  ie. the implementation *is* the standard and any bugs that may exist in that
+                   implementation are part of the standard, as well.
+
+                   * OpenSSL is the de facto standard.  It's utilized by OpenSSH and other projects */
+                if (preg_match('#DEK-Info: (.+),(.+)#', $key, $matches)) {
+                    $iv = pack('H*', trim($matches[2]));
+                    $symkey = pack('H*', md5($this->password . substr($iv, 0, 8))); // symkey is short for symmetric key
+                    $symkey.= pack('H*', md5($symkey . $this->password . substr($iv, 0, 8)));
+                    // remove the Proc-Type / DEK-Info sections as they're no longer needed
+                    $key = preg_replace('#^(?:Proc-Type|DEK-Info): .*#m', '', $key);
+                    $ciphertext = $this->_extractBER($key);
+                    if ($ciphertext === false) {
+                        $ciphertext = $key;
+                    }
+                    switch ($matches[1]) {
+                        case 'AES-256-CBC':
+                            if (!class_exists('Crypt_AES')) {
+                                include_once 'Crypt/AES.php';
+                            }
+                            $crypto = new Crypt_AES();
+                            break;
+                        case 'AES-128-CBC':
+                            if (!class_exists('Crypt_AES')) {
+                                include_once 'Crypt/AES.php';
+                            }
+                            $symkey = substr($symkey, 0, 16);
+                            $crypto = new Crypt_AES();
+                            break;
+                        case 'DES-EDE3-CFB':
+                            if (!class_exists('Crypt_TripleDES')) {
+                                include_once 'Crypt/TripleDES.php';
+                            }
+                            $crypto = new Crypt_TripleDES(CRYPT_DES_MODE_CFB);
+                            break;
+                        case 'DES-EDE3-CBC':
+                            if (!class_exists('Crypt_TripleDES')) {
+                                include_once 'Crypt/TripleDES.php';
+                            }
+                            $symkey = substr($symkey, 0, 24);
+                            $crypto = new Crypt_TripleDES();
+                            break;
+                        case 'DES-CBC':
+                            if (!class_exists('Crypt_DES')) {
+                                include_once 'Crypt/DES.php';
+                            }
+                            $crypto = new Crypt_DES();
+                            break;
+                        default:
+                            return false;
+                    }
+                    $crypto->setKey($symkey);
+                    $crypto->setIV($iv);
+                    $decoded = $crypto->decrypt($ciphertext);
+                } else {
+                    $decoded = $this->_extractBER($key);
+                }
+
+                if ($decoded !== false) {
+                    $key = $decoded;
+                }
+
+                $components = array();
+
+                if (ord($this->_string_shift($key)) != CRYPT_RSA_ASN1_SEQUENCE) {
+                    return false;
+                }
+                if ($this->_decodeLength($key) != strlen($key)) {
+                    return false;
+                }
+
+                $tag = ord($this->_string_shift($key));
+                /* intended for keys for which OpenSSL's asn1parse returns the following:
+
+                    0:d=0  hl=4 l= 631 cons: SEQUENCE
+                    4:d=1  hl=2 l=   1 prim:  INTEGER           :00
+                    7:d=1  hl=2 l=  13 cons:  SEQUENCE
+                    9:d=2  hl=2 l=   9 prim:   OBJECT            :rsaEncryption
+                   20:d=2  hl=2 l=   0 prim:   NULL
+                   22:d=1  hl=4 l= 609 prim:  OCTET STRING
+
+                   ie. PKCS8 keys*/
+
+                if ($tag == CRYPT_RSA_ASN1_INTEGER && substr($key, 0, 3) == "\x01\x00\x30") {
+                    $this->_string_shift($key, 3);
+                    $tag = CRYPT_RSA_ASN1_SEQUENCE;
+                }
+
+                if ($tag == CRYPT_RSA_ASN1_SEQUENCE) {
+                    $temp = $this->_string_shift($key, $this->_decodeLength($key));
+                    if (ord($this->_string_shift($temp)) != CRYPT_RSA_ASN1_OBJECT) {
+                        return false;
+                    }
+                    $length = $this->_decodeLength($temp);
+                    switch ($this->_string_shift($temp, $length)) {
+                        case "\x2a\x86\x48\x86\xf7\x0d\x01\x01\x01": // rsaEncryption
+                            break;
+                        case "\x2a\x86\x48\x86\xf7\x0d\x01\x05\x03": // pbeWithMD5AndDES-CBC
+                            /*
+                               PBEParameter ::= SEQUENCE {
+                                   salt OCTET STRING (SIZE(8)),
+                                   iterationCount INTEGER }
+                            */
+                            if (ord($this->_string_shift($temp)) != CRYPT_RSA_ASN1_SEQUENCE) {
+                                return false;
+                            }
+                            if ($this->_decodeLength($temp) != strlen($temp)) {
+                                return false;
+                            }
+                            $this->_string_shift($temp); // assume it's an octet string
+                            $salt = $this->_string_shift($temp, $this->_decodeLength($temp));
+                            if (ord($this->_string_shift($temp)) != CRYPT_RSA_ASN1_INTEGER) {
+                                return false;
+                            }
+                            $this->_decodeLength($temp);
+                            list(, $iterationCount) = unpack('N', str_pad($temp, 4, chr(0), STR_PAD_LEFT));
+                            $this->_string_shift($key); // assume it's an octet string
+                            $length = $this->_decodeLength($key);
+                            if (strlen($key) != $length) {
+                                return false;
+                            }
+
+                            if (!class_exists('Crypt_DES')) {
+                                include_once 'Crypt/DES.php';
+                            }
+                            $crypto = new Crypt_DES();
+                            $crypto->setPassword($this->password, 'pbkdf1', 'md5', $salt, $iterationCount);
+                            $key = $crypto->decrypt($key);
+                            if ($key === false) {
+                                return false;
+                            }
+                            return $this->_parseKey($key, CRYPT_RSA_PRIVATE_FORMAT_PKCS1);
+                        default:
+                            return false;
+                    }
+                    /* intended for keys for which OpenSSL's asn1parse returns the following:
+
+                        0:d=0  hl=4 l= 290 cons: SEQUENCE
+                        4:d=1  hl=2 l=  13 cons:  SEQUENCE
+                        6:d=2  hl=2 l=   9 prim:   OBJECT            :rsaEncryption
+                       17:d=2  hl=2 l=   0 prim:   NULL
+                       19:d=1  hl=4 l= 271 prim:  BIT STRING */
+                    $tag = ord($this->_string_shift($key)); // skip over the BIT STRING / OCTET STRING tag
+                    $this->_decodeLength($key); // skip over the BIT STRING / OCTET STRING length
+                    // "The initial octet shall encode, as an unsigned binary integer wtih bit 1 as the least significant bit, the number of
+                    //  unused bits in the final subsequent octet. The number shall be in the range zero to seven."
+                    //  -- http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf (section 8.6.2.2)
+                    if ($tag == CRYPT_RSA_ASN1_BITSTRING) {
+                        $this->_string_shift($key);
+                    }
+                    if (ord($this->_string_shift($key)) != CRYPT_RSA_ASN1_SEQUENCE) {
+                        return false;
+                    }
+                    if ($this->_decodeLength($key) != strlen($key)) {
+                        return false;
+                    }
+                    $tag = ord($this->_string_shift($key));
+                }
+                if ($tag != CRYPT_RSA_ASN1_INTEGER) {
+                    return false;
+                }
+
+                $length = $this->_decodeLength($key);
+                $temp = $this->_string_shift($key, $length);
+                if (strlen($temp) != 1 || ord($temp) > 2) {
+                    $components['modulus'] = new Math_BigInteger($temp, 256);
+                    $this->_string_shift($key); // skip over CRYPT_RSA_ASN1_INTEGER
+                    $length = $this->_decodeLength($key);
+                    $components[$type == CRYPT_RSA_PUBLIC_FORMAT_PKCS1 ? 'publicExponent' : 'privateExponent'] = new Math_BigInteger($this->_string_shift($key, $length), 256);
+
+                    return $components;
+                }
+                if (ord($this->_string_shift($key)) != CRYPT_RSA_ASN1_INTEGER) {
+                    return false;
+                }
+                $length = $this->_decodeLength($key);
+                $components['modulus'] = new Math_BigInteger($this->_string_shift($key, $length), 256);
+                $this->_string_shift($key);
+                $length = $this->_decodeLength($key);
+                $components['publicExponent'] = new Math_BigInteger($this->_string_shift($key, $length), 256);
+                $this->_string_shift($key);
+                $length = $this->_decodeLength($key);
+                $components['privateExponent'] = new Math_BigInteger($this->_string_shift($key, $length), 256);
+                $this->_string_shift($key);
+                $length = $this->_decodeLength($key);
+                $components['primes'] = array(1 => new Math_BigInteger($this->_string_shift($key, $length), 256));
+                $this->_string_shift($key);
+                $length = $this->_decodeLength($key);
+                $components['primes'][] = new Math_BigInteger($this->_string_shift($key, $length), 256);
+                $this->_string_shift($key);
+                $length = $this->_decodeLength($key);
+                $components['exponents'] = array(1 => new Math_BigInteger($this->_string_shift($key, $length), 256));
+                $this->_string_shift($key);
+                $length = $this->_decodeLength($key);
+                $components['exponents'][] = new Math_BigInteger($this->_string_shift($key, $length), 256);
+                $this->_string_shift($key);
+                $length = $this->_decodeLength($key);
+                $components['coefficients'] = array(2 => new Math_BigInteger($this->_string_shift($key, $length), 256));
+
+                if (!empty($key)) {
+                    if (ord($this->_string_shift($key)) != CRYPT_RSA_ASN1_SEQUENCE) {
+                        return false;
+                    }
+                    $this->_decodeLength($key);
+                    while (!empty($key)) {
+                        if (ord($this->_string_shift($key)) != CRYPT_RSA_ASN1_SEQUENCE) {
+                            return false;
+                        }
+                        $this->_decodeLength($key);
+                        $key = substr($key, 1);
+                        $length = $this->_decodeLength($key);
+                        $components['primes'][] = new Math_BigInteger($this->_string_shift($key, $length), 256);
+                        $this->_string_shift($key);
+                        $length = $this->_decodeLength($key);
+                        $components['exponents'][] = new Math_BigInteger($this->_string_shift($key, $length), 256);
+                        $this->_string_shift($key);
+                        $length = $this->_decodeLength($key);
+                        $components['coefficients'][] = new Math_BigInteger($this->_string_shift($key, $length), 256);
+                    }
+                }
+
+                return $components;
+            case CRYPT_RSA_PUBLIC_FORMAT_OPENSSH:
+                $parts = explode(' ', $key, 3);
+
+                $key = isset($parts[1]) ? base64_decode($parts[1]) : false;
+                if ($key === false) {
+                    return false;
+                }
+
+                $comment = isset($parts[2]) ? $parts[2] : false;
+
+                $cleanup = substr($key, 0, 11) == "\0\0\0\7ssh-rsa";
+
+                if (strlen($key) <= 4) {
+                    return false;
+                }
+                extract(unpack('Nlength', $this->_string_shift($key, 4)));
+                $publicExponent = new Math_BigInteger($this->_string_shift($key, $length), -256);
+                if (strlen($key) <= 4) {
+                    return false;
+                }
+                extract(unpack('Nlength', $this->_string_shift($key, 4)));
+                $modulus = new Math_BigInteger($this->_string_shift($key, $length), -256);
+
+                if ($cleanup && strlen($key)) {
+                    if (strlen($key) <= 4) {
+                        return false;
+                    }
+                    extract(unpack('Nlength', $this->_string_shift($key, 4)));
+                    $realModulus = new Math_BigInteger($this->_string_shift($key, $length), -256);
+                    return strlen($key) ? false : array(
+                        'modulus' => $realModulus,
+                        'publicExponent' => $modulus,
+                        'comment' => $comment
+                    );
+                } else {
+                    return strlen($key) ? false : array(
+                        'modulus' => $modulus,
+                        'publicExponent' => $publicExponent,
+                        'comment' => $comment
+                    );
+                }
+            // http://www.w3.org/TR/xmldsig-core/#sec-RSAKeyValue
+            // http://en.wikipedia.org/wiki/XML_Signature
+            case CRYPT_RSA_PRIVATE_FORMAT_XML:
+            case CRYPT_RSA_PUBLIC_FORMAT_XML:
+                $this->components = array();
+
+                $xml = xml_parser_create('UTF-8');
+                xml_set_object($xml, $this);
+                xml_set_element_handler($xml, '_start_element_handler', '_stop_element_handler');
+                xml_set_character_data_handler($xml, '_data_handler');
+                // add <xml></xml> to account for "dangling" tags like <BitStrength>...</BitStrength> that are sometimes added
+                if (!xml_parse($xml, '<xml>' . $key . '</xml>')) {
+                    return false;
+                }
+
+                return isset($this->components['modulus']) && isset($this->components['publicExponent']) ? $this->components : false;
+            // from PuTTY's SSHPUBK.C
+            case CRYPT_RSA_PRIVATE_FORMAT_PUTTY:
+                $components = array();
+                $key = preg_split('#\r\n|\r|\n#', $key);
+                $type = trim(preg_replace('#PuTTY-User-Key-File-2: (.+)#', '$1', $key[0]));
+                if ($type != 'ssh-rsa') {
+                    return false;
+                }
+                $encryption = trim(preg_replace('#Encryption: (.+)#', '$1', $key[1]));
+                $comment = trim(preg_replace('#Comment: (.+)#', '$1', $key[2]));
+
+                $publicLength = trim(preg_replace('#Public-Lines: (\d+)#', '$1', $key[3]));
+                $public = base64_decode(implode('', array_map('trim', array_slice($key, 4, $publicLength))));
+                $public = substr($public, 11);
+                extract(unpack('Nlength', $this->_string_shift($public, 4)));
+                $components['publicExponent'] = new Math_BigInteger($this->_string_shift($public, $length), -256);
+                extract(unpack('Nlength', $this->_string_shift($public, 4)));
+                $components['modulus'] = new Math_BigInteger($this->_string_shift($public, $length), -256);
+
+                $privateLength = trim(preg_replace('#Private-Lines: (\d+)#', '$1', $key[$publicLength + 4]));
+                $private = base64_decode(implode('', array_map('trim', array_slice($key, $publicLength + 5, $privateLength))));
+
+                switch ($encryption) {
+                    case 'aes256-cbc':
+                        if (!class_exists('Crypt_AES')) {
+                            include_once 'Crypt/AES.php';
+                        }
+                        $symkey = '';
+                        $sequence = 0;
+                        while (strlen($symkey) < 32) {
+                            $temp = pack('Na*', $sequence++, $this->password);
+                            $symkey.= pack('H*', sha1($temp));
+                        }
+                        $symkey = substr($symkey, 0, 32);
+                        $crypto = new Crypt_AES();
+                }
+
+                if ($encryption != 'none') {
+                    $crypto->setKey($symkey);
+                    $crypto->disablePadding();
+                    $private = $crypto->decrypt($private);
+                    if ($private === false) {
+                        return false;
+                    }
+                }
+
+                extract(unpack('Nlength', $this->_string_shift($private, 4)));
+                if (strlen($private) < $length) {
+                    return false;
+                }
+                $components['privateExponent'] = new Math_BigInteger($this->_string_shift($private, $length), -256);
+                extract(unpack('Nlength', $this->_string_shift($private, 4)));
+                if (strlen($private) < $length) {
+                    return false;
+                }
+                $components['primes'] = array(1 => new Math_BigInteger($this->_string_shift($private, $length), -256));
+                extract(unpack('Nlength', $this->_string_shift($private, 4)));
+                if (strlen($private) < $length) {
+                    return false;
+                }
+                $components['primes'][] = new Math_BigInteger($this->_string_shift($private, $length), -256);
+
+                $temp = $components['primes'][1]->subtract($this->one);
+                $components['exponents'] = array(1 => $components['publicExponent']->modInverse($temp));
+                $temp = $components['primes'][2]->subtract($this->one);
+                $components['exponents'][] = $components['publicExponent']->modInverse($temp);
+
+                extract(unpack('Nlength', $this->_string_shift($private, 4)));
+                if (strlen($private) < $length) {
+                    return false;
+                }
+                $components['coefficients'] = array(2 => new Math_BigInteger($this->_string_shift($private, $length), -256));
+
+                return $components;
+        }
+    }
+
+    /**
+     * Returns the key size
+     *
+     * More specifically, this returns the size of the modulo in bits.
+     *
+     * @access public
+     * @return int
+     */
+    function getSize()
+    {
+        return !isset($this->modulus) ? 0 : strlen($this->modulus->toBits());
+    }
+
+    /**
+     * Start Element Handler
+     *
+     * Called by xml_set_element_handler()
+     *
+     * @access private
+     * @param resource $parser
+     * @param string $name
+     * @param array $attribs
+     */
+    function _start_element_handler($parser, $name, $attribs)
+    {
+        //$name = strtoupper($name);
+        switch ($name) {
+            case 'MODULUS':
+                $this->current = &$this->components['modulus'];
+                break;
+            case 'EXPONENT':
+                $this->current = &$this->components['publicExponent'];
+                break;
+            case 'P':
+                $this->current = &$this->components['primes'][1];
+                break;
+            case 'Q':
+                $this->current = &$this->components['primes'][2];
+                break;
+            case 'DP':
+                $this->current = &$this->components['exponents'][1];
+                break;
+            case 'DQ':
+                $this->current = &$this->components['exponents'][2];
+                break;
+            case 'INVERSEQ':
+                $this->current = &$this->components['coefficients'][2];
+                break;
+            case 'D':
+                $this->current = &$this->components['privateExponent'];
+        }
+        $this->current = '';
+    }
+
+    /**
+     * Stop Element Handler
+     *
+     * Called by xml_set_element_handler()
+     *
+     * @access private
+     * @param resource $parser
+     * @param string $name
+     */
+    function _stop_element_handler($parser, $name)
+    {
+        if (isset($this->current)) {
+            $this->current = new Math_BigInteger(base64_decode($this->current), 256);
+            unset($this->current);
+        }
+    }
+
+    /**
+     * Data Handler
+     *
+     * Called by xml_set_character_data_handler()
+     *
+     * @access private
+     * @param resource $parser
+     * @param string $data
+     */
+    function _data_handler($parser, $data)
+    {
+        if (!isset($this->current) || is_object($this->current)) {
+            return;
+        }
+        $this->current.= trim($data);
+    }
+
+    /**
+     * Loads a public or private key
+     *
+     * Returns true on success and false on failure (ie. an incorrect password was provided or the key was malformed)
+     *
+     * @access public
+     * @param string $key
+     * @param int $type optional
+     */
+    function loadKey($key, $type = false)
+    {
+        if (is_object($key) && strtolower(get_class($key)) == 'crypt_rsa') {
+            $this->privateKeyFormat = $key->privateKeyFormat;
+            $this->publicKeyFormat = $key->publicKeyFormat;
+            $this->k = $key->k;
+            $this->hLen = $key->hLen;
+            $this->sLen = $key->sLen;
+            $this->mgfHLen = $key->mgfHLen;
+            $this->encryptionMode = $key->encryptionMode;
+            $this->signatureMode = $key->signatureMode;
+            $this->password = $key->password;
+            $this->configFile = $key->configFile;
+            $this->comment = $key->comment;
+
+            if (is_object($key->hash)) {
+                $this->hash = new Crypt_Hash($key->hash->getHash());
+            }
+            if (is_object($key->mgfHash)) {
+                $this->mgfHash = new Crypt_Hash($key->mgfHash->getHash());
+            }
+
+            if (is_object($key->modulus)) {
+                $this->modulus = $key->modulus->copy();
+            }
+            if (is_object($key->exponent)) {
+                $this->exponent = $key->exponent->copy();
+            }
+            if (is_object($key->publicExponent)) {
+                $this->publicExponent = $key->publicExponent->copy();
+            }
+
+            $this->primes = array();
+            $this->exponents = array();
+            $this->coefficients = array();
+
+            foreach ($this->primes as $prime) {
+                $this->primes[] = $prime->copy();
+            }
+            foreach ($this->exponents as $exponent) {
+                $this->exponents[] = $exponent->copy();
+            }
+            foreach ($this->coefficients as $coefficient) {
+                $this->coefficients[] = $coefficient->copy();
+            }
+
+            return true;
+        }
+
+        if ($type === false) {
+            $types = array(
+                CRYPT_RSA_PUBLIC_FORMAT_RAW,
+                CRYPT_RSA_PRIVATE_FORMAT_PKCS1,
+                CRYPT_RSA_PRIVATE_FORMAT_XML,
+                CRYPT_RSA_PRIVATE_FORMAT_PUTTY,
+                CRYPT_RSA_PUBLIC_FORMAT_OPENSSH
+            );
+            foreach ($types as $type) {
+                $components = $this->_parseKey($key, $type);
+                if ($components !== false) {
+                    break;
+                }
+            }
+        } else {
+            $components = $this->_parseKey($key, $type);
+        }
+
+        if ($components === false) {
+            $this->comment = null;
+            $this->modulus = null;
+            $this->k = null;
+            $this->exponent = null;
+            $this->primes = null;
+            $this->exponents = null;
+            $this->coefficients = null;
+            $this->publicExponent = null;
+
+            return false;
+        }
+
+        if (isset($components['comment']) && $components['comment'] !== false) {
+            $this->comment = $components['comment'];
+        }
+        $this->modulus = $components['modulus'];
+        $this->k = strlen($this->modulus->toBytes());
+        $this->exponent = isset($components['privateExponent']) ? $components['privateExponent'] : $components['publicExponent'];
+        if (isset($components['primes'])) {
+            $this->primes = $components['primes'];
+            $this->exponents = $components['exponents'];
+            $this->coefficients = $components['coefficients'];
+            $this->publicExponent = $components['publicExponent'];
+        } else {
+            $this->primes = array();
+            $this->exponents = array();
+            $this->coefficients = array();
+            $this->publicExponent = false;
+        }
+
+        switch ($type) {
+            case CRYPT_RSA_PUBLIC_FORMAT_OPENSSH:
+            case CRYPT_RSA_PUBLIC_FORMAT_RAW:
+                $this->setPublicKey();
+                break;
+            case CRYPT_RSA_PRIVATE_FORMAT_PKCS1:
+                switch (true) {
+                    case strpos($key, '-BEGIN PUBLIC KEY-') !== false:
+                    case strpos($key, '-BEGIN RSA PUBLIC KEY-') !== false:
+                        $this->setPublicKey();
+                }
+        }
+
+        return true;
+    }
+
+    /**
+     * Sets the password
+     *
+     * Private keys can be encrypted with a password.  To unset the password, pass in the empty string or false.
+     * Or rather, pass in $password such that empty($password) && !is_string($password) is true.
+     *
+     * @see self::createKey()
+     * @see self::loadKey()
+     * @access public
+     * @param string $password
+     */
+    function setPassword($password = false)
+    {
+        $this->password = $password;
+    }
+
+    /**
+     * Defines the public key
+     *
+     * Some private key formats define the public exponent and some don't.  Those that don't define it are problematic when
+     * used in certain contexts.  For example, in SSH-2, RSA authentication works by sending the public key along with a
+     * message signed by the private key to the server.  The SSH-2 server looks the public key up in an index of public keys
+     * and if it's present then proceeds to verify the signature.  Problem is, if your private key doesn't include the public
+     * exponent this won't work unless you manually add the public exponent. phpseclib tries to guess if the key being used
+     * is the public key but in the event that it guesses incorrectly you might still want to explicitly set the key as being
+     * public.
+     *
+     * Do note that when a new key is loaded the index will be cleared.
+     *
+     * Returns true on success, false on failure
+     *
+     * @see self::getPublicKey()
+     * @access public
+     * @param string $key optional
+     * @param int $type optional
+     * @return bool
+     */
+    function setPublicKey($key = false, $type = false)
+    {
+        // if a public key has already been loaded return false
+        if (!empty($this->publicExponent)) {
+            return false;
+        }
+
+        if ($key === false && !empty($this->modulus)) {
+            $this->publicExponent = $this->exponent;
+            return true;
+        }
+
+        if ($type === false) {
+            $types = array(
+                CRYPT_RSA_PUBLIC_FORMAT_RAW,
+                CRYPT_RSA_PUBLIC_FORMAT_PKCS1,
+                CRYPT_RSA_PUBLIC_FORMAT_XML,
+                CRYPT_RSA_PUBLIC_FORMAT_OPENSSH
+            );
+            foreach ($types as $type) {
+                $components = $this->_parseKey($key, $type);
+                if ($components !== false) {
+                    break;
+                }
+            }
+        } else {
+            $components = $this->_parseKey($key, $type);
+        }
+
+        if ($components === false) {
+            return false;
+        }
+
+        if (empty($this->modulus) || !$this->modulus->equals($components['modulus'])) {
+            $this->modulus = $components['modulus'];
+            $this->exponent = $this->publicExponent = $components['publicExponent'];
+            return true;
+        }
+
+        $this->publicExponent = $components['publicExponent'];
+
+        return true;
+    }
+
+    /**
+     * Defines the private key
+     *
+     * If phpseclib guessed a private key was a public key and loaded it as such it might be desirable to force
+     * phpseclib to treat the key as a private key. This function will do that.
+     *
+     * Do note that when a new key is loaded the index will be cleared.
+     *
+     * Returns true on success, false on failure
+     *
+     * @see self::getPublicKey()
+     * @access public
+     * @param string $key optional
+     * @param int $type optional
+     * @return bool
+     */
+    function setPrivateKey($key = false, $type = false)
+    {
+        if ($key === false && !empty($this->publicExponent)) {
+            $this->publicExponent = false;
+            return true;
+        }
+
+        $rsa = new Crypt_RSA();
+        if (!$rsa->loadKey($key, $type)) {
+            return false;
+        }
+        $rsa->publicExponent = false;
+
+        // don't overwrite the old key if the new key is invalid
+        $this->loadKey($rsa);
+        return true;
+    }
+
+    /**
+     * Returns the public key
+     *
+     * The public key is only returned under two circumstances - if the private key had the public key embedded within it
+     * or if the public key was set via setPublicKey().  If the currently loaded key is supposed to be the public key this
+     * function won't return it since this library, for the most part, doesn't distinguish between public and private keys.
+     *
+     * @see self::getPublicKey()
+     * @access public
+     * @param string $key
+     * @param int $type optional
+     */
+    function getPublicKey($type = CRYPT_RSA_PUBLIC_FORMAT_PKCS8)
+    {
+        if (empty($this->modulus) || empty($this->publicExponent)) {
+            return false;
+        }
+
+        $oldFormat = $this->publicKeyFormat;
+        $this->publicKeyFormat = $type;
+        $temp = $this->_convertPublicKey($this->modulus, $this->publicExponent);
+        $this->publicKeyFormat = $oldFormat;
+        return $temp;
+    }
+
+    /**
+     * Returns the public key's fingerprint
+     *
+     * The public key's fingerprint is returned, which is equivalent to running `ssh-keygen -lf rsa.pub`. If there is
+     * no public key currently loaded, false is returned.
+     * Example output (md5): "c1:b1:30:29:d7:b8:de:6c:97:77:10:d7:46:41:63:87" (as specified by RFC 4716)
+     *
+     * @access public
+     * @param string $algorithm The hashing algorithm to be used. Valid options are 'md5' and 'sha256'. False is returned
+     * for invalid values.
+     * @return mixed
+     */
+    function getPublicKeyFingerprint($algorithm = 'md5')
+    {
+        if (empty($this->modulus) || empty($this->publicExponent)) {
+            return false;
+        }
+
+        $modulus = $this->modulus->toBytes(true);
+        $publicExponent = $this->publicExponent->toBytes(true);
+
+        $RSAPublicKey = pack('Na*Na*Na*', strlen('ssh-rsa'), 'ssh-rsa', strlen($publicExponent), $publicExponent, strlen($modulus), $modulus);
+
+        switch ($algorithm) {
+            case 'sha256':
+                $hash = new Crypt_Hash('sha256');
+                $base = base64_encode($hash->hash($RSAPublicKey));
+                return substr($base, 0, strlen($base) - 1);
+            case 'md5':
+                return substr(chunk_split(md5($RSAPublicKey), 2, ':'), 0, -1);
+            default:
+                return false;
+        }
+    }
+
+    /**
+     * Returns the private key
+     *
+     * The private key is only returned if the currently loaded key contains the constituent prime numbers.
+     *
+     * @see self::getPublicKey()
+     * @access public
+     * @param string $key
+     * @param int $type optional
+     * @return mixed
+     */
+    function getPrivateKey($type = CRYPT_RSA_PUBLIC_FORMAT_PKCS1)
+    {
+        if (empty($this->primes)) {
+            return false;
+        }
+
+        $oldFormat = $this->privateKeyFormat;
+        $this->privateKeyFormat = $type;
+        $temp = $this->_convertPrivateKey($this->modulus, $this->publicExponent, $this->exponent, $this->primes, $this->exponents, $this->coefficients);
+        $this->privateKeyFormat = $oldFormat;
+        return $temp;
+    }
+
+    /**
+     * Returns a minimalistic private key
+     *
+     * Returns the private key without the prime number constituants.  Structurally identical to a public key that
+     * hasn't been set as the public key
+     *
+     * @see self::getPrivateKey()
+     * @access private
+     * @param string $key
+     * @param int $type optional
+     */
+    function _getPrivatePublicKey($mode = CRYPT_RSA_PUBLIC_FORMAT_PKCS8)
+    {
+        if (empty($this->modulus) || empty($this->exponent)) {
+            return false;
+        }
+
+        $oldFormat = $this->publicKeyFormat;
+        $this->publicKeyFormat = $mode;
+        $temp = $this->_convertPublicKey($this->modulus, $this->exponent);
+        $this->publicKeyFormat = $oldFormat;
+        return $temp;
+    }
+
+    /**
+     *  __toString() magic method
+     *
+     * @access public
+     * @return string
+     */
+    function __toString()
+    {
+        $key = $this->getPrivateKey($this->privateKeyFormat);
+        if ($key !== false) {
+            return $key;
+        }
+        $key = $this->_getPrivatePublicKey($this->publicKeyFormat);
+        return $key !== false ? $key : '';
+    }
+
+    /**
+     *  __clone() magic method
+     *
+     * @access public
+     * @return Crypt_RSA
+     */
+    function __clone()
+    {
+        $key = new Crypt_RSA();
+        $key->loadKey($this);
+        return $key;
+    }
+
+    /**
+     * Generates the smallest and largest numbers requiring $bits bits
+     *
+     * @access private
+     * @param int $bits
+     * @return array
+     */
+    function _generateMinMax($bits)
+    {
+        $bytes = $bits >> 3;
+        $min = str_repeat(chr(0), $bytes);
+        $max = str_repeat(chr(0xFF), $bytes);
+        $msb = $bits & 7;
+        if ($msb) {
+            $min = chr(1 << ($msb - 1)) . $min;
+            $max = chr((1 << $msb) - 1) . $max;
+        } else {
+            $min[0] = chr(0x80);
+        }
+
+        return array(
+            'min' => new Math_BigInteger($min, 256),
+            'max' => new Math_BigInteger($max, 256)
+        );
+    }
+
+    /**
+     * DER-decode the length
+     *
+     * DER supports lengths up to (2**8)**127, however, we'll only support lengths up to (2**8)**4.  See
+     * {@link http://itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf#p=13 X.690 paragraph 8.1.3} for more information.
+     *
+     * @access private
+     * @param string $string
+     * @return int
+     */
+    function _decodeLength(&$string)
+    {
+        $length = ord($this->_string_shift($string));
+        if ($length & 0x80) { // definite length, long form
+            $length&= 0x7F;
+            $temp = $this->_string_shift($string, $length);
+            list(, $length) = unpack('N', substr(str_pad($temp, 4, chr(0), STR_PAD_LEFT), -4));
+        }
+        return $length;
+    }
+
+    /**
+     * DER-encode the length
+     *
+     * DER supports lengths up to (2**8)**127, however, we'll only support lengths up to (2**8)**4.  See
+     * {@link http://itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf#p=13 X.690 paragraph 8.1.3} for more information.
+     *
+     * @access private
+     * @param int $length
+     * @return string
+     */
+    function _encodeLength($length)
+    {
+        if ($length <= 0x7F) {
+            return chr($length);
+        }
+
+        $temp = ltrim(pack('N', $length), chr(0));
+        return pack('Ca*', 0x80 | strlen($temp), $temp);
+    }
+
+    /**
+     * String Shift
+     *
+     * Inspired by array_shift
+     *
+     * @param string $string
+     * @param int $index
+     * @return string
+     * @access private
+     */
+    function _string_shift(&$string, $index = 1)
+    {
+        $substr = substr($string, 0, $index);
+        $string = substr($string, $index);
+        return $substr;
+    }
+
+    /**
+     * Determines the private key format
+     *
+     * @see self::createKey()
+     * @access public
+     * @param int $format
+     */
+    function setPrivateKeyFormat($format)
+    {
+        $this->privateKeyFormat = $format;
+    }
+
+    /**
+     * Determines the public key format
+     *
+     * @see self::createKey()
+     * @access public
+     * @param int $format
+     */
+    function setPublicKeyFormat($format)
+    {
+        $this->publicKeyFormat = $format;
+    }
+
+    /**
+     * Determines which hashing function should be used
+     *
+     * Used with signature production / verification and (if the encryption mode is CRYPT_RSA_ENCRYPTION_OAEP) encryption and
+     * decryption.  If $hash isn't supported, sha1 is used.
+     *
+     * @access public
+     * @param string $hash
+     */
+    function setHash($hash)
+    {
+        // Crypt_Hash supports algorithms that PKCS#1 doesn't support.  md5-96 and sha1-96, for example.
+        switch ($hash) {
+            case 'md2':
+            case 'md5':
+            case 'sha1':
+            case 'sha256':
+            case 'sha384':
+            case 'sha512':
+                $this->hash = new Crypt_Hash($hash);
+                $this->hashName = $hash;
+                break;
+            default:
+                $this->hash = new Crypt_Hash('sha1');
+                $this->hashName = 'sha1';
+        }
+        $this->hLen = $this->hash->getLength();
+    }
+
+    /**
+     * Determines which hashing function should be used for the mask generation function
+     *
+     * The mask generation function is used by CRYPT_RSA_ENCRYPTION_OAEP and CRYPT_RSA_SIGNATURE_PSS and although it's
+     * best if Hash and MGFHash are set to the same thing this is not a requirement.
+     *
+     * @access public
+     * @param string $hash
+     */
+    function setMGFHash($hash)
+    {
+        // Crypt_Hash supports algorithms that PKCS#1 doesn't support.  md5-96 and sha1-96, for example.
+        switch ($hash) {
+            case 'md2':
+            case 'md5':
+            case 'sha1':
+            case 'sha256':
+            case 'sha384':
+            case 'sha512':
+                $this->mgfHash = new Crypt_Hash($hash);
+                break;
+            default:
+                $this->mgfHash = new Crypt_Hash('sha1');
+        }
+        $this->mgfHLen = $this->mgfHash->getLength();
+    }
+
+    /**
+     * Determines the salt length
+     *
+     * To quote from {@link http://tools.ietf.org/html/rfc3447#page-38 RFC3447#page-38}:
+     *
+     *    Typical salt lengths in octets are hLen (the length of the output
+     *    of the hash function Hash) and 0.
+     *
+     * @access public
+     * @param int $format
+     */
+    function setSaltLength($sLen)
+    {
+        $this->sLen = $sLen;
+    }
+
+    /**
+     * Integer-to-Octet-String primitive
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-4.1 RFC3447#section-4.1}.
+     *
+     * @access private
+     * @param Math_BigInteger $x
+     * @param int $xLen
+     * @return string
+     */
+    function _i2osp($x, $xLen)
+    {
+        $x = $x->toBytes();
+        if (strlen($x) > $xLen) {
+            user_error('Integer too large');
+            return false;
+        }
+        return str_pad($x, $xLen, chr(0), STR_PAD_LEFT);
+    }
+
+    /**
+     * Octet-String-to-Integer primitive
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-4.2 RFC3447#section-4.2}.
+     *
+     * @access private
+     * @param string $x
+     * @return Math_BigInteger
+     */
+    function _os2ip($x)
+    {
+        return new Math_BigInteger($x, 256);
+    }
+
+    /**
+     * Exponentiate with or without Chinese Remainder Theorem
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-5.1.1 RFC3447#section-5.1.2}.
+     *
+     * @access private
+     * @param Math_BigInteger $x
+     * @return Math_BigInteger
+     */
+    function _exponentiate($x)
+    {
+        switch (true) {
+            case empty($this->primes):
+            case $this->primes[1]->equals($this->zero):
+            case empty($this->coefficients):
+            case $this->coefficients[2]->equals($this->zero):
+            case empty($this->exponents):
+            case $this->exponents[1]->equals($this->zero):
+                return $x->modPow($this->exponent, $this->modulus);
+        }
+
+        $num_primes = count($this->primes);
+
+        if (defined('CRYPT_RSA_DISABLE_BLINDING')) {
+            $m_i = array(
+                1 => $x->modPow($this->exponents[1], $this->primes[1]),
+                2 => $x->modPow($this->exponents[2], $this->primes[2])
+            );
+            $h = $m_i[1]->subtract($m_i[2]);
+            $h = $h->multiply($this->coefficients[2]);
+            list(, $h) = $h->divide($this->primes[1]);
+            $m = $m_i[2]->add($h->multiply($this->primes[2]));
+
+            $r = $this->primes[1];
+            for ($i = 3; $i <= $num_primes; $i++) {
+                $m_i = $x->modPow($this->exponents[$i], $this->primes[$i]);
+
+                $r = $r->multiply($this->primes[$i - 1]);
+
+                $h = $m_i->subtract($m);
+                $h = $h->multiply($this->coefficients[$i]);
+                list(, $h) = $h->divide($this->primes[$i]);
+
+                $m = $m->add($r->multiply($h));
+            }
+        } else {
+            $smallest = $this->primes[1];
+            for ($i = 2; $i <= $num_primes; $i++) {
+                if ($smallest->compare($this->primes[$i]) > 0) {
+                    $smallest = $this->primes[$i];
+                }
+            }
+
+            $one = new Math_BigInteger(1);
+
+            $r = $one->random($one, $smallest->subtract($one));
+
+            $m_i = array(
+                1 => $this->_blind($x, $r, 1),
+                2 => $this->_blind($x, $r, 2)
+            );
+            $h = $m_i[1]->subtract($m_i[2]);
+            $h = $h->multiply($this->coefficients[2]);
+            list(, $h) = $h->divide($this->primes[1]);
+            $m = $m_i[2]->add($h->multiply($this->primes[2]));
+
+            $r = $this->primes[1];
+            for ($i = 3; $i <= $num_primes; $i++) {
+                $m_i = $this->_blind($x, $r, $i);
+
+                $r = $r->multiply($this->primes[$i - 1]);
+
+                $h = $m_i->subtract($m);
+                $h = $h->multiply($this->coefficients[$i]);
+                list(, $h) = $h->divide($this->primes[$i]);
+
+                $m = $m->add($r->multiply($h));
+            }
+        }
+
+        return $m;
+    }
+
+    /**
+     * Performs RSA Blinding
+     *
+     * Protects against timing attacks by employing RSA Blinding.
+     * Returns $x->modPow($this->exponents[$i], $this->primes[$i])
+     *
+     * @access private
+     * @param Math_BigInteger $x
+     * @param Math_BigInteger $r
+     * @param int $i
+     * @return Math_BigInteger
+     */
+    function _blind($x, $r, $i)
+    {
+        $x = $x->multiply($r->modPow($this->publicExponent, $this->primes[$i]));
+        $x = $x->modPow($this->exponents[$i], $this->primes[$i]);
+
+        $r = $r->modInverse($this->primes[$i]);
+        $x = $x->multiply($r);
+        list(, $x) = $x->divide($this->primes[$i]);
+
+        return $x;
+    }
+
+    /**
+     * Performs blinded RSA equality testing
+     *
+     * Protects against a particular type of timing attack described.
+     *
+     * See {@link http://codahale.com/a-lesson-in-timing-attacks/ A Lesson In Timing Attacks (or, Don't use MessageDigest.isEquals)}
+     *
+     * Thanks for the heads up singpolyma!
+     *
+     * @access private
+     * @param string $x
+     * @param string $y
+     * @return bool
+     */
+    function _equals($x, $y)
+    {
+        if (strlen($x) != strlen($y)) {
+            return false;
+        }
+
+        $result = 0;
+        for ($i = 0; $i < strlen($x); $i++) {
+            $result |= ord($x[$i]) ^ ord($y[$i]);
+        }
+
+        return $result == 0;
+    }
+
+    /**
+     * RSAEP
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-5.1.1 RFC3447#section-5.1.1}.
+     *
+     * @access private
+     * @param Math_BigInteger $m
+     * @return Math_BigInteger
+     */
+    function _rsaep($m)
+    {
+        if ($m->compare($this->zero) < 0 || $m->compare($this->modulus) > 0) {
+            user_error('Message representative out of range');
+            return false;
+        }
+        return $this->_exponentiate($m);
+    }
+
+    /**
+     * RSADP
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-5.1.2 RFC3447#section-5.1.2}.
+     *
+     * @access private
+     * @param Math_BigInteger $c
+     * @return Math_BigInteger
+     */
+    function _rsadp($c)
+    {
+        if ($c->compare($this->zero) < 0 || $c->compare($this->modulus) > 0) {
+            user_error('Ciphertext representative out of range');
+            return false;
+        }
+        return $this->_exponentiate($c);
+    }
+
+    /**
+     * RSASP1
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-5.2.1 RFC3447#section-5.2.1}.
+     *
+     * @access private
+     * @param Math_BigInteger $m
+     * @return Math_BigInteger
+     */
+    function _rsasp1($m)
+    {
+        if ($m->compare($this->zero) < 0 || $m->compare($this->modulus) > 0) {
+            user_error('Message representative out of range');
+            return false;
+        }
+        return $this->_exponentiate($m);
+    }
+
+    /**
+     * RSAVP1
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-5.2.2 RFC3447#section-5.2.2}.
+     *
+     * @access private
+     * @param Math_BigInteger $s
+     * @return Math_BigInteger
+     */
+    function _rsavp1($s)
+    {
+        if ($s->compare($this->zero) < 0 || $s->compare($this->modulus) > 0) {
+            user_error('Signature representative out of range');
+            return false;
+        }
+        return $this->_exponentiate($s);
+    }
+
+    /**
+     * MGF1
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#appendix-B.2.1 RFC3447#appendix-B.2.1}.
+     *
+     * @access private
+     * @param string $mgfSeed
+     * @param int $mgfLen
+     * @return string
+     */
+    function _mgf1($mgfSeed, $maskLen)
+    {
+        // if $maskLen would yield strings larger than 4GB, PKCS#1 suggests a "Mask too long" error be output.
+
+        $t = '';
+        $count = ceil($maskLen / $this->mgfHLen);
+        for ($i = 0; $i < $count; $i++) {
+            $c = pack('N', $i);
+            $t.= $this->mgfHash->hash($mgfSeed . $c);
+        }
+
+        return substr($t, 0, $maskLen);
+    }
+
+    /**
+     * RSAES-OAEP-ENCRYPT
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-7.1.1 RFC3447#section-7.1.1} and
+     * {http://en.wikipedia.org/wiki/Optimal_Asymmetric_Encryption_Padding OAES}.
+     *
+     * @access private
+     * @param string $m
+     * @param string $l
+     * @return string
+     */
+    function _rsaes_oaep_encrypt($m, $l = '')
+    {
+        $mLen = strlen($m);
+
+        // Length checking
+
+        // if $l is larger than two million terrabytes and you're using sha1, PKCS#1 suggests a "Label too long" error
+        // be output.
+
+        if ($mLen > $this->k - 2 * $this->hLen - 2) {
+            user_error('Message too long');
+            return false;
+        }
+
+        // EME-OAEP encoding
+
+        $lHash = $this->hash->hash($l);
+        $ps = str_repeat(chr(0), $this->k - $mLen - 2 * $this->hLen - 2);
+        $db = $lHash . $ps . chr(1) . $m;
+        $seed = crypt_random_string($this->hLen);
+        $dbMask = $this->_mgf1($seed, $this->k - $this->hLen - 1);
+        $maskedDB = $db ^ $dbMask;
+        $seedMask = $this->_mgf1($maskedDB, $this->hLen);
+        $maskedSeed = $seed ^ $seedMask;
+        $em = chr(0) . $maskedSeed . $maskedDB;
+
+        // RSA encryption
+
+        $m = $this->_os2ip($em);
+        $c = $this->_rsaep($m);
+        $c = $this->_i2osp($c, $this->k);
+
+        // Output the ciphertext C
+
+        return $c;
+    }
+
+    /**
+     * RSAES-OAEP-DECRYPT
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-7.1.2 RFC3447#section-7.1.2}.  The fact that the error
+     * messages aren't distinguishable from one another hinders debugging, but, to quote from RFC3447#section-7.1.2:
+     *
+     *    Note.  Care must be taken to ensure that an opponent cannot
+     *    distinguish the different error conditions in Step 3.g, whether by
+     *    error message or timing, or, more generally, learn partial
+     *    information about the encoded message EM.  Otherwise an opponent may
+     *    be able to obtain useful information about the decryption of the
+     *    ciphertext C, leading to a chosen-ciphertext attack such as the one
+     *    observed by Manger [36].
+     *
+     * As for $l...  to quote from {@link http://tools.ietf.org/html/rfc3447#page-17 RFC3447#page-17}:
+     *
+     *    Both the encryption and the decryption operations of RSAES-OAEP take
+     *    the value of a label L as input.  In this version of PKCS #1, L is
+     *    the empty string; other uses of the label are outside the scope of
+     *    this document.
+     *
+     * @access private
+     * @param string $c
+     * @param string $l
+     * @return string
+     */
+    function _rsaes_oaep_decrypt($c, $l = '')
+    {
+        // Length checking
+
+        // if $l is larger than two million terrabytes and you're using sha1, PKCS#1 suggests a "Label too long" error
+        // be output.
+
+        if (strlen($c) != $this->k || $this->k < 2 * $this->hLen + 2) {
+            user_error('Decryption error');
+            return false;
+        }
+
+        // RSA decryption
+
+        $c = $this->_os2ip($c);
+        $m = $this->_rsadp($c);
+        if ($m === false) {
+            user_error('Decryption error');
+            return false;
+        }
+        $em = $this->_i2osp($m, $this->k);
+
+        // EME-OAEP decoding
+
+        $lHash = $this->hash->hash($l);
+        $y = ord($em[0]);
+        $maskedSeed = substr($em, 1, $this->hLen);
+        $maskedDB = substr($em, $this->hLen + 1);
+        $seedMask = $this->_mgf1($maskedDB, $this->hLen);
+        $seed = $maskedSeed ^ $seedMask;
+        $dbMask = $this->_mgf1($seed, $this->k - $this->hLen - 1);
+        $db = $maskedDB ^ $dbMask;
+        $lHash2 = substr($db, 0, $this->hLen);
+        $m = substr($db, $this->hLen);
+        if (!$this->_equals($lHash, $lHash2)) {
+            user_error('Decryption error');
+            return false;
+        }
+        $m = ltrim($m, chr(0));
+        if (ord($m[0]) != 1) {
+            user_error('Decryption error');
+            return false;
+        }
+
+        // Output the message M
+
+        return substr($m, 1);
+    }
+
+    /**
+     * Raw Encryption / Decryption
+     *
+     * Doesn't use padding and is not recommended.
+     *
+     * @access private
+     * @param string $m
+     * @return string
+     */
+    function _raw_encrypt($m)
+    {
+        $temp = $this->_os2ip($m);
+        $temp = $this->_rsaep($temp);
+        return  $this->_i2osp($temp, $this->k);
+    }
+
+    /**
+     * RSAES-PKCS1-V1_5-ENCRYPT
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-7.2.1 RFC3447#section-7.2.1}.
+     *
+     * @access private
+     * @param string $m
+     * @return string
+     */
+    function _rsaes_pkcs1_v1_5_encrypt($m)
+    {
+        $mLen = strlen($m);
+
+        // Length checking
+
+        if ($mLen > $this->k - 11) {
+            user_error('Message too long');
+            return false;
+        }
+
+        // EME-PKCS1-v1_5 encoding
+
+        $psLen = $this->k - $mLen - 3;
+        $ps = '';
+        while (strlen($ps) != $psLen) {
+            $temp = crypt_random_string($psLen - strlen($ps));
+            $temp = str_replace("\x00", '', $temp);
+            $ps.= $temp;
+        }
+        $type = 2;
+        // see the comments of _rsaes_pkcs1_v1_5_decrypt() to understand why this is being done
+        if (defined('CRYPT_RSA_PKCS15_COMPAT') && (!isset($this->publicExponent) || $this->exponent !== $this->publicExponent)) {
+            $type = 1;
+            // "The padding string PS shall consist of k-3-||D|| octets. ... for block type 01, they shall have value FF"
+            $ps = str_repeat("\xFF", $psLen);
+        }
+        $em = chr(0) . chr($type) . $ps . chr(0) . $m;
+
+        // RSA encryption
+        $m = $this->_os2ip($em);
+        $c = $this->_rsaep($m);
+        $c = $this->_i2osp($c, $this->k);
+
+        // Output the ciphertext C
+
+        return $c;
+    }
+
+    /**
+     * RSAES-PKCS1-V1_5-DECRYPT
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-7.2.2 RFC3447#section-7.2.2}.
+     *
+     * For compatibility purposes, this function departs slightly from the description given in RFC3447.
+     * The reason being that RFC2313#section-8.1 (PKCS#1 v1.5) states that ciphertext's encrypted by the
+     * private key should have the second byte set to either 0 or 1 and that ciphertext's encrypted by the
+     * public key should have the second byte set to 2.  In RFC3447 (PKCS#1 v2.1), the second byte is supposed
+     * to be 2 regardless of which key is used.  For compatibility purposes, we'll just check to make sure the
+     * second byte is 2 or less.  If it is, we'll accept the decrypted string as valid.
+     *
+     * As a consequence of this, a private key encrypted ciphertext produced with Crypt_RSA may not decrypt
+     * with a strictly PKCS#1 v1.5 compliant RSA implementation.  Public key encrypted ciphertext's should but
+     * not private key encrypted ciphertext's.
+     *
+     * @access private
+     * @param string $c
+     * @return string
+     */
+    function _rsaes_pkcs1_v1_5_decrypt($c)
+    {
+        // Length checking
+
+        if (strlen($c) != $this->k) { // or if k < 11
+            user_error('Decryption error');
+            return false;
+        }
+
+        // RSA decryption
+
+        $c = $this->_os2ip($c);
+        $m = $this->_rsadp($c);
+
+        if ($m === false) {
+            user_error('Decryption error');
+            return false;
+        }
+        $em = $this->_i2osp($m, $this->k);
+
+        // EME-PKCS1-v1_5 decoding
+
+        if (ord($em[0]) != 0 || ord($em[1]) > 2) {
+            user_error('Decryption error');
+            return false;
+        }
+
+        $ps = substr($em, 2, strpos($em, chr(0), 2) - 2);
+        $m = substr($em, strlen($ps) + 3);
+
+        if (strlen($ps) < 8) {
+            user_error('Decryption error');
+            return false;
+        }
+
+        // Output M
+
+        return $m;
+    }
+
+    /**
+     * EMSA-PSS-ENCODE
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-9.1.1 RFC3447#section-9.1.1}.
+     *
+     * @access private
+     * @param string $m
+     * @param int $emBits
+     */
+    function _emsa_pss_encode($m, $emBits)
+    {
+        // if $m is larger than two million terrabytes and you're using sha1, PKCS#1 suggests a "Label too long" error
+        // be output.
+
+        $emLen = ($emBits + 1) >> 3; // ie. ceil($emBits / 8)
+        $sLen = $this->sLen !== null ? $this->sLen : $this->hLen;
+
+        $mHash = $this->hash->hash($m);
+        if ($emLen < $this->hLen + $sLen + 2) {
+            user_error('Encoding error');
+            return false;
+        }
+
+        $salt = crypt_random_string($sLen);
+        $m2 = "\0\0\0\0\0\0\0\0" . $mHash . $salt;
+        $h = $this->hash->hash($m2);
+        $ps = str_repeat(chr(0), $emLen - $sLen - $this->hLen - 2);
+        $db = $ps . chr(1) . $salt;
+        $dbMask = $this->_mgf1($h, $emLen - $this->hLen - 1);
+        $maskedDB = $db ^ $dbMask;
+        $maskedDB[0] = ~chr(0xFF << ($emBits & 7)) & $maskedDB[0];
+        $em = $maskedDB . $h . chr(0xBC);
+
+        return $em;
+    }
+
+    /**
+     * EMSA-PSS-VERIFY
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-9.1.2 RFC3447#section-9.1.2}.
+     *
+     * @access private
+     * @param string $m
+     * @param string $em
+     * @param int $emBits
+     * @return string
+     */
+    function _emsa_pss_verify($m, $em, $emBits)
+    {
+        // if $m is larger than two million terrabytes and you're using sha1, PKCS#1 suggests a "Label too long" error
+        // be output.
+
+        $emLen = ($emBits + 1) >> 3; // ie. ceil($emBits / 8);
+        $sLen = $this->sLen !== null ? $this->sLen : $this->hLen;
+
+        $mHash = $this->hash->hash($m);
+        if ($emLen < $this->hLen + $sLen + 2) {
+            return false;
+        }
+
+        if ($em[strlen($em) - 1] != chr(0xBC)) {
+            return false;
+        }
+
+        $maskedDB = substr($em, 0, -$this->hLen - 1);
+        $h = substr($em, -$this->hLen - 1, $this->hLen);
+        $temp = chr(0xFF << ($emBits & 7));
+        if ((~$maskedDB[0] & $temp) != $temp) {
+            return false;
+        }
+        $dbMask = $this->_mgf1($h, $emLen - $this->hLen - 1);
+        $db = $maskedDB ^ $dbMask;
+        $db[0] = ~chr(0xFF << ($emBits & 7)) & $db[0];
+        $temp = $emLen - $this->hLen - $sLen - 2;
+        if (substr($db, 0, $temp) != str_repeat(chr(0), $temp) || ord($db[$temp]) != 1) {
+            return false;
+        }
+        $salt = substr($db, $temp + 1); // should be $sLen long
+        $m2 = "\0\0\0\0\0\0\0\0" . $mHash . $salt;
+        $h2 = $this->hash->hash($m2);
+        return $this->_equals($h, $h2);
+    }
+
+    /**
+     * RSASSA-PSS-SIGN
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-8.1.1 RFC3447#section-8.1.1}.
+     *
+     * @access private
+     * @param string $m
+     * @return string
+     */
+    function _rsassa_pss_sign($m)
+    {
+        // EMSA-PSS encoding
+
+        $em = $this->_emsa_pss_encode($m, 8 * $this->k - 1);
+
+        // RSA signature
+
+        $m = $this->_os2ip($em);
+        $s = $this->_rsasp1($m);
+        $s = $this->_i2osp($s, $this->k);
+
+        // Output the signature S
+
+        return $s;
+    }
+
+    /**
+     * RSASSA-PSS-VERIFY
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-8.1.2 RFC3447#section-8.1.2}.
+     *
+     * @access private
+     * @param string $m
+     * @param string $s
+     * @return string
+     */
+    function _rsassa_pss_verify($m, $s)
+    {
+        // Length checking
+
+        if (strlen($s) != $this->k) {
+            user_error('Invalid signature');
+            return false;
+        }
+
+        // RSA verification
+
+        $modBits = 8 * $this->k;
+
+        $s2 = $this->_os2ip($s);
+        $m2 = $this->_rsavp1($s2);
+        if ($m2 === false) {
+            user_error('Invalid signature');
+            return false;
+        }
+        $em = $this->_i2osp($m2, $modBits >> 3);
+        if ($em === false) {
+            user_error('Invalid signature');
+            return false;
+        }
+
+        // EMSA-PSS verification
+
+        return $this->_emsa_pss_verify($m, $em, $modBits - 1);
+    }
+
+    /**
+     * EMSA-PKCS1-V1_5-ENCODE
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-9.2 RFC3447#section-9.2}.
+     *
+     * @access private
+     * @param string $m
+     * @param int $emLen
+     * @return string
+     */
+    function _emsa_pkcs1_v1_5_encode($m, $emLen)
+    {
+        $h = $this->hash->hash($m);
+        if ($h === false) {
+            return false;
+        }
+
+        // see http://tools.ietf.org/html/rfc3447#page-43
+        switch ($this->hashName) {
+            case 'md2':
+                $t = pack('H*', '3020300c06082a864886f70d020205000410');
+                break;
+            case 'md5':
+                $t = pack('H*', '3020300c06082a864886f70d020505000410');
+                break;
+            case 'sha1':
+                $t = pack('H*', '3021300906052b0e03021a05000414');
+                break;
+            case 'sha256':
+                $t = pack('H*', '3031300d060960864801650304020105000420');
+                break;
+            case 'sha384':
+                $t = pack('H*', '3041300d060960864801650304020205000430');
+                break;
+            case 'sha512':
+                $t = pack('H*', '3051300d060960864801650304020305000440');
+        }
+        $t.= $h;
+        $tLen = strlen($t);
+
+        if ($emLen < $tLen + 11) {
+            user_error('Intended encoded message length too short');
+            return false;
+        }
+
+        $ps = str_repeat(chr(0xFF), $emLen - $tLen - 3);
+
+        $em = "\0\1$ps\0$t";
+
+        return $em;
+    }
+
+    /**
+     * RSASSA-PKCS1-V1_5-SIGN
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-8.2.1 RFC3447#section-8.2.1}.
+     *
+     * @access private
+     * @param string $m
+     * @return string
+     */
+    function _rsassa_pkcs1_v1_5_sign($m)
+    {
+        // EMSA-PKCS1-v1_5 encoding
+
+        $em = $this->_emsa_pkcs1_v1_5_encode($m, $this->k);
+        if ($em === false) {
+            user_error('RSA modulus too short');
+            return false;
+        }
+
+        // RSA signature
+
+        $m = $this->_os2ip($em);
+        $s = $this->_rsasp1($m);
+        $s = $this->_i2osp($s, $this->k);
+
+        // Output the signature S
+
+        return $s;
+    }
+
+    /**
+     * RSASSA-PKCS1-V1_5-VERIFY
+     *
+     * See {@link http://tools.ietf.org/html/rfc3447#section-8.2.2 RFC3447#section-8.2.2}.
+     *
+     * @access private
+     * @param string $m
+     * @return string
+     */
+    function _rsassa_pkcs1_v1_5_verify($m, $s)
+    {
+        // Length checking
+
+        if (strlen($s) != $this->k) {
+            user_error('Invalid signature');
+            return false;
+        }
+
+        // RSA verification
+
+        $s = $this->_os2ip($s);
+        $m2 = $this->_rsavp1($s);
+        if ($m2 === false) {
+            user_error('Invalid signature');
+            return false;
+        }
+        $em = $this->_i2osp($m2, $this->k);
+        if ($em === false) {
+            user_error('Invalid signature');
+            return false;
+        }
+
+        // EMSA-PKCS1-v1_5 encoding
+
+        $em2 = $this->_emsa_pkcs1_v1_5_encode($m, $this->k);
+        if ($em2 === false) {
+            user_error('RSA modulus too short');
+            return false;
+        }
+
+        // Compare
+        return $this->_equals($em, $em2);
+    }
+
+    /**
+     * Set Encryption Mode
+     *
+     * Valid values include CRYPT_RSA_ENCRYPTION_OAEP and CRYPT_RSA_ENCRYPTION_PKCS1.
+     *
+     * @access public
+     * @param int $mode
+     */
+    function setEncryptionMode($mode)
+    {
+        $this->encryptionMode = $mode;
+    }
+
+    /**
+     * Set Signature Mode
+     *
+     * Valid values include CRYPT_RSA_SIGNATURE_PSS and CRYPT_RSA_SIGNATURE_PKCS1
+     *
+     * @access public
+     * @param int $mode
+     */
+    function setSignatureMode($mode)
+    {
+        $this->signatureMode = $mode;
+    }
+
+    /**
+     * Set public key comment.
+     *
+     * @access public
+     * @param string $comment
+     */
+    function setComment($comment)
+    {
+        $this->comment = $comment;
+    }
+
+    /**
+     * Get public key comment.
+     *
+     * @access public
+     * @return string
+     */
+    function getComment()
+    {
+        return $this->comment;
+    }
+
+    /**
+     * Encryption
+     *
+     * Both CRYPT_RSA_ENCRYPTION_OAEP and CRYPT_RSA_ENCRYPTION_PKCS1 both place limits on how long $plaintext can be.
+     * If $plaintext exceeds those limits it will be broken up so that it does and the resultant ciphertext's will
+     * be concatenated together.
+     *
+     * @see self::decrypt()
+     * @access public
+     * @param string $plaintext
+     * @return string
+     */
+    function encrypt($plaintext)
+    {
+        switch ($this->encryptionMode) {
+            case CRYPT_RSA_ENCRYPTION_NONE:
+                $plaintext = str_split($plaintext, $this->k);
+                $ciphertext = '';
+                foreach ($plaintext as $m) {
+                    $ciphertext.= $this->_raw_encrypt($m);
+                }
+                return $ciphertext;
+            case CRYPT_RSA_ENCRYPTION_PKCS1:
+                $length = $this->k - 11;
+                if ($length <= 0) {
+                    return false;
+                }
+
+                $plaintext = str_split($plaintext, $length);
+                $ciphertext = '';
+                foreach ($plaintext as $m) {
+                    $ciphertext.= $this->_rsaes_pkcs1_v1_5_encrypt($m);
+                }
+                return $ciphertext;
+            //case CRYPT_RSA_ENCRYPTION_OAEP:
+            default:
+                $length = $this->k - 2 * $this->hLen - 2;
+                if ($length <= 0) {
+                    return false;
+                }
+
+                $plaintext = str_split($plaintext, $length);
+                $ciphertext = '';
+                foreach ($plaintext as $m) {
+                    $ciphertext.= $this->_rsaes_oaep_encrypt($m);
+                }
+                return $ciphertext;
+        }
+    }
+
+    /**
+     * Decryption
+     *
+     * @see self::encrypt()
+     * @access public
+     * @param string $plaintext
+     * @return string
+     */
+    function decrypt($ciphertext)
+    {
+        if ($this->k <= 0) {
+            return false;
+        }
+
+        $ciphertext = str_split($ciphertext, $this->k);
+        $ciphertext[count($ciphertext) - 1] = str_pad($ciphertext[count($ciphertext) - 1], $this->k, chr(0), STR_PAD_LEFT);
+
+        $plaintext = '';
+
+        switch ($this->encryptionMode) {
+            case CRYPT_RSA_ENCRYPTION_NONE:
+                $decrypt = '_raw_encrypt';
+                break;
+            case CRYPT_RSA_ENCRYPTION_PKCS1:
+                $decrypt = '_rsaes_pkcs1_v1_5_decrypt';
+                break;
+            //case CRYPT_RSA_ENCRYPTION_OAEP:
+            default:
+                $decrypt = '_rsaes_oaep_decrypt';
+        }
+
+        foreach ($ciphertext as $c) {
+            $temp = $this->$decrypt($c);
+            if ($temp === false) {
+                return false;
+            }
+            $plaintext.= $temp;
+        }
+
+        return $plaintext;
+    }
+
+    /**
+     * Create a signature
+     *
+     * @see self::verify()
+     * @access public
+     * @param string $message
+     * @return string
+     */
+    function sign($message)
+    {
+        if (empty($this->modulus) || empty($this->exponent)) {
+            return false;
+        }
+
+        switch ($this->signatureMode) {
+            case CRYPT_RSA_SIGNATURE_PKCS1:
+                return $this->_rsassa_pkcs1_v1_5_sign($message);
+            //case CRYPT_RSA_SIGNATURE_PSS:
+            default:
+                return $this->_rsassa_pss_sign($message);
+        }
+    }
+
+    /**
+     * Verifies a signature
+     *
+     * @see self::sign()
+     * @access public
+     * @param string $message
+     * @param string $signature
+     * @return bool
+     */
+    function verify($message, $signature)
+    {
+        if (empty($this->modulus) || empty($this->exponent)) {
+            return false;
+        }
+
+        switch ($this->signatureMode) {
+            case CRYPT_RSA_SIGNATURE_PKCS1:
+                return $this->_rsassa_pkcs1_v1_5_verify($message, $signature);
+            //case CRYPT_RSA_SIGNATURE_PSS:
+            default:
+                return $this->_rsassa_pss_verify($message, $signature);
+        }
+    }
+
+    /**
+     * Extract raw BER from Base64 encoding
+     *
+     * @access private
+     * @param string $str
+     * @return string
+     */
+    function _extractBER($str)
+    {
+        /* X.509 certs are assumed to be base64 encoded but sometimes they'll have additional things in them
+         * above and beyond the ceritificate.
+         * ie. some may have the following preceding the -----BEGIN CERTIFICATE----- line:
+         *
+         * Bag Attributes
+         *     localKeyID: 01 00 00 00
+         * subject=/O=organization/OU=org unit/CN=common name
+         * issuer=/O=organization/CN=common name
+         */
+        $temp = preg_replace('#.*?^-+[^-]+-+[\r\n ]*$#ms', '', $str, 1);
+        // remove the -----BEGIN CERTIFICATE----- and -----END CERTIFICATE----- stuff
+        $temp = preg_replace('#-+[^-]+-+#', '', $temp);
+        // remove new lines
+        $temp = str_replace(array("\r", "\n", ' '), '', $temp);
+        $temp = preg_match('#^[a-zA-Z\d/+]*={0,2}$#', $temp) ? base64_decode($temp) : false;
+        return $temp != false ? $temp : $str;
+    }
+}
diff --git a/lib/php/phpseclib/Crypt/Random.php b/lib/php/phpseclib/Crypt/Random.php
new file mode 100644
index 00000000..233c3554
--- /dev/null
+++ b/lib/php/phpseclib/Crypt/Random.php
@@ -0,0 +1,338 @@
+<?php
+
+/**
+ * Random Number Generator
+ *
+ * The idea behind this function is that it can be easily replaced with your own crypt_random_string()
+ * function. eg. maybe you have a better source of entropy for creating the initial states or whatever.
+ *
+ * PHP versions 4 and 5
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ *    include 'Crypt/Random.php';
+ *
+ *    echo bin2hex(crypt_random_string(8));
+ * ?>
+ * </code>
+ *
+ * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @category  Crypt
+ * @package   Crypt_Random
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2007 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+// laravel is a PHP framework that utilizes phpseclib. laravel workbenches may, independently,
+// have phpseclib as a requirement as well. if you're developing such a program you may encounter
+// a "Cannot redeclare crypt_random_string()" error.
+if (!function_exists('crypt_random_string')) {
+    /**
+     * "Is Windows" test
+     *
+     * @access private
+     */
+    define('CRYPT_RANDOM_IS_WINDOWS', strtoupper(substr(PHP_OS, 0, 3)) === 'WIN');
+
+    /**
+     * Generate a random string.
+     *
+     * Although microoptimizations are generally discouraged as they impair readability this function is ripe with
+     * microoptimizations because this function has the potential of being called a huge number of times.
+     * eg. for RSA key generation.
+     *
+     * @param int $length
+     * @return string
+     * @access public
+     */
+    function crypt_random_string($length)
+    {
+        if (!$length) {
+            return '';
+        }
+
+        if (CRYPT_RANDOM_IS_WINDOWS) {
+            // method 1. prior to PHP 5.3, mcrypt_create_iv() would call rand() on windows
+            if (extension_loaded('mcrypt') && version_compare(PHP_VERSION, '5.3.0', '>=')) {
+                return @mcrypt_create_iv($length);
+            }
+            // method 2. openssl_random_pseudo_bytes was introduced in PHP 5.3.0 but prior to PHP 5.3.4 there was,
+            // to quote <http://php.net/ChangeLog-5.php#5.3.4>, "possible blocking behavior". as of 5.3.4
+            // openssl_random_pseudo_bytes and mcrypt_create_iv do the exact same thing on Windows. ie. they both
+            // call php_win32_get_random_bytes():
+            //
+            // https://github.com/php/php-src/blob/7014a0eb6d1611151a286c0ff4f2238f92c120d6/ext/openssl/openssl.c#L5008
+            // https://github.com/php/php-src/blob/7014a0eb6d1611151a286c0ff4f2238f92c120d6/ext/mcrypt/mcrypt.c#L1392
+            //
+            // php_win32_get_random_bytes() is defined thusly:
+            //
+            // https://github.com/php/php-src/blob/7014a0eb6d1611151a286c0ff4f2238f92c120d6/win32/winutil.c#L80
+            //
+            // we're calling it, all the same, in the off chance that the mcrypt extension is not available
+            if (extension_loaded('openssl') && version_compare(PHP_VERSION, '5.3.4', '>=')) {
+                return openssl_random_pseudo_bytes($length);
+            }
+        } else {
+            // method 1. the fastest
+            if (extension_loaded('openssl') && version_compare(PHP_VERSION, '5.3.0', '>=')) {
+                return openssl_random_pseudo_bytes($length);
+            }
+            // method 2
+            static $fp = true;
+            if ($fp === true) {
+                // warning's will be output unles the error suppression operator is used. errors such as
+                // "open_basedir restriction in effect", "Permission denied", "No such file or directory", etc.
+                $fp = @fopen('/dev/urandom', 'rb');
+            }
+            if ($fp !== true && $fp !== false) { // surprisingly faster than !is_bool() or is_resource()
+                return fread($fp, $length);
+            }
+            // method 3. pretty much does the same thing as method 2 per the following url:
+            // https://github.com/php/php-src/blob/7014a0eb6d1611151a286c0ff4f2238f92c120d6/ext/mcrypt/mcrypt.c#L1391
+            // surprisingly slower than method 2. maybe that's because mcrypt_create_iv does a bunch of error checking that we're
+            // not doing. regardless, this'll only be called if this PHP script couldn't open /dev/urandom due to open_basedir
+            // restrictions or some such
+            if (extension_loaded('mcrypt')) {
+                return @mcrypt_create_iv($length, MCRYPT_DEV_URANDOM);
+            }
+        }
+        // at this point we have no choice but to use a pure-PHP CSPRNG
+
+        // cascade entropy across multiple PHP instances by fixing the session and collecting all
+        // environmental variables, including the previous session data and the current session
+        // data.
+        //
+        // mt_rand seeds itself by looking at the PID and the time, both of which are (relatively)
+        // easy to guess at. linux uses mouse clicks, keyboard timings, etc, as entropy sources, but
+        // PHP isn't low level to be able to use those as sources and on a web server there's not likely
+        // going to be a ton of keyboard or mouse action. web servers do have one thing that we can use
+        // however, a ton of people visiting the website. obviously you don't want to base your seeding
+        // soley on parameters a potential attacker sends but (1) not everything in $_SERVER is controlled
+        // by the user and (2) this isn't just looking at the data sent by the current user - it's based
+        // on the data sent by all users. one user requests the page and a hash of their info is saved.
+        // another user visits the page and the serialization of their data is utilized along with the
+        // server envirnment stuff and a hash of the previous http request data (which itself utilizes
+        // a hash of the session data before that). certainly an attacker should be assumed to have
+        // full control over his own http requests. he, however, is not going to have control over
+        // everyone's http requests.
+        static $crypto = false, $v;
+        if ($crypto === false) {
+            // save old session data
+            $old_session_id = session_id();
+            $old_use_cookies = ini_get('session.use_cookies');
+            $old_session_cache_limiter = session_cache_limiter();
+            $_OLD_SESSION = isset($_SESSION) ? $_SESSION : false;
+            if ($old_session_id != '') {
+                session_write_close();
+            }
+
+            session_id(1);
+            ini_set('session.use_cookies', 0);
+            session_cache_limiter('');
+            session_start();
+
+            $v = $seed = $_SESSION['seed'] = pack('H*', sha1(
+                (isset($_SERVER) ? phpseclib_safe_serialize($_SERVER) : '') .
+                (isset($_POST) ? phpseclib_safe_serialize($_POST) : '') .
+                (isset($_GET) ? phpseclib_safe_serialize($_GET) : '') .
+                (isset($_COOKIE) ? phpseclib_safe_serialize($_COOKIE) : '') .
+                phpseclib_safe_serialize($GLOBALS) .
+                phpseclib_safe_serialize($_SESSION) .
+                phpseclib_safe_serialize($_OLD_SESSION)
+            ));
+            if (!isset($_SESSION['count'])) {
+                $_SESSION['count'] = 0;
+            }
+            $_SESSION['count']++;
+
+            session_write_close();
+
+            // restore old session data
+            if ($old_session_id != '') {
+                session_id($old_session_id);
+                session_start();
+                ini_set('session.use_cookies', $old_use_cookies);
+                session_cache_limiter($old_session_cache_limiter);
+            } else {
+                if ($_OLD_SESSION !== false) {
+                    $_SESSION = $_OLD_SESSION;
+                    unset($_OLD_SESSION);
+                } else {
+                    unset($_SESSION);
+                }
+            }
+
+            // in SSH2 a shared secret and an exchange hash are generated through the key exchange process.
+            // the IV client to server is the hash of that "nonce" with the letter A and for the encryption key it's the letter C.
+            // if the hash doesn't produce enough a key or an IV that's long enough concat successive hashes of the
+            // original hash and the current hash. we'll be emulating that. for more info see the following URL:
+            //
+            // http://tools.ietf.org/html/rfc4253#section-7.2
+            //
+            // see the is_string($crypto) part for an example of how to expand the keys
+            $key = pack('H*', sha1($seed . 'A'));
+            $iv = pack('H*', sha1($seed . 'C'));
+
+            // ciphers are used as per the nist.gov link below. also, see this link:
+            //
+            // http://en.wikipedia.org/wiki/Cryptographically_secure_pseudorandom_number_generator#Designs_based_on_cryptographic_primitives
+            switch (true) {
+                case phpseclib_resolve_include_path('Crypt/AES.php'):
+                    if (!class_exists('Crypt_AES')) {
+                        include_once 'AES.php';
+                    }
+                    $crypto = new Crypt_AES(CRYPT_AES_MODE_CTR);
+                    break;
+                case phpseclib_resolve_include_path('Crypt/Twofish.php'):
+                    if (!class_exists('Crypt_Twofish')) {
+                        include_once 'Twofish.php';
+                    }
+                    $crypto = new Crypt_Twofish(CRYPT_TWOFISH_MODE_CTR);
+                    break;
+                case phpseclib_resolve_include_path('Crypt/Blowfish.php'):
+                    if (!class_exists('Crypt_Blowfish')) {
+                        include_once 'Blowfish.php';
+                    }
+                    $crypto = new Crypt_Blowfish(CRYPT_BLOWFISH_MODE_CTR);
+                    break;
+                case phpseclib_resolve_include_path('Crypt/TripleDES.php'):
+                    if (!class_exists('Crypt_TripleDES')) {
+                        include_once 'TripleDES.php';
+                    }
+                    $crypto = new Crypt_TripleDES(CRYPT_DES_MODE_CTR);
+                    break;
+                case phpseclib_resolve_include_path('Crypt/DES.php'):
+                    if (!class_exists('Crypt_DES')) {
+                        include_once 'DES.php';
+                    }
+                    $crypto = new Crypt_DES(CRYPT_DES_MODE_CTR);
+                    break;
+                case phpseclib_resolve_include_path('Crypt/RC4.php'):
+                    if (!class_exists('Crypt_RC4')) {
+                        include_once 'RC4.php';
+                    }
+                    $crypto = new Crypt_RC4();
+                    break;
+                default:
+                    user_error('crypt_random_string requires at least one symmetric cipher be loaded');
+                    return false;
+            }
+
+            $crypto->setKey($key);
+            $crypto->setIV($iv);
+            $crypto->enableContinuousBuffer();
+        }
+
+        //return $crypto->encrypt(str_repeat("\0", $length));
+
+        // the following is based off of ANSI X9.31:
+        //
+        // http://csrc.nist.gov/groups/STM/cavp/documents/rng/931rngext.pdf
+        //
+        // OpenSSL uses that same standard for it's random numbers:
+        //
+        // http://www.opensource.apple.com/source/OpenSSL/OpenSSL-38/openssl/fips-1.0/rand/fips_rand.c
+        // (do a search for "ANS X9.31 A.2.4")
+        $result = '';
+        while (strlen($result) < $length) {
+            $i = $crypto->encrypt(microtime()); // strlen(microtime()) == 21
+            $r = $crypto->encrypt($i ^ $v); // strlen($v) == 20
+            $v = $crypto->encrypt($r ^ $i); // strlen($r) == 20
+            $result.= $r;
+        }
+        return substr($result, 0, $length);
+    }
+}
+
+if (!function_exists('phpseclib_safe_serialize')) {
+    /**
+     * Safely serialize variables
+     *
+     * If a class has a private __sleep() method it'll give a fatal error on PHP 5.2 and earlier.
+     * PHP 5.3 will emit a warning.
+     *
+     * @param mixed $arr
+     * @access public
+     */
+    function phpseclib_safe_serialize(&$arr)
+    {
+        if (is_object($arr)) {
+            return '';
+        }
+        if (!is_array($arr)) {
+            return serialize($arr);
+        }
+        // prevent circular array recursion
+        if (isset($arr['__phpseclib_marker'])) {
+            return '';
+        }
+        $safearr = array();
+        $arr['__phpseclib_marker'] = true;
+        foreach (array_keys($arr) as $key) {
+            // do not recurse on the '__phpseclib_marker' key itself, for smaller memory usage
+            if ($key !== '__phpseclib_marker') {
+                $safearr[$key] = phpseclib_safe_serialize($arr[$key]);
+            }
+        }
+        unset($arr['__phpseclib_marker']);
+        return serialize($safearr);
+    }
+}
+
+if (!function_exists('phpseclib_resolve_include_path')) {
+    /**
+     * Resolve filename against the include path.
+     *
+     * Wrapper around stream_resolve_include_path() (which was introduced in
+     * PHP 5.3.2) with fallback implementation for earlier PHP versions.
+     *
+     * @param string $filename
+     * @return string|false
+     * @access public
+     */
+    function phpseclib_resolve_include_path($filename)
+    {
+        if (function_exists('stream_resolve_include_path')) {
+            return stream_resolve_include_path($filename);
+        }
+
+        // handle non-relative paths
+        if (file_exists($filename)) {
+            return realpath($filename);
+        }
+
+        $paths = PATH_SEPARATOR == ':' ?
+            preg_split('#(?<!phar):#', get_include_path()) :
+            explode(PATH_SEPARATOR, get_include_path());
+        foreach ($paths as $prefix) {
+            // path's specified in include_path don't always end in /
+            $ds = substr($prefix, -1) == DIRECTORY_SEPARATOR ? '' : DIRECTORY_SEPARATOR;
+            $file = $prefix . $ds . $filename;
+            if (file_exists($file)) {
+                return realpath($file);
+            }
+        }
+
+        return false;
+    }
+}
diff --git a/lib/php/phpseclib/Crypt/Rijndael.php b/lib/php/phpseclib/Crypt/Rijndael.php
new file mode 100644
index 00000000..6474726b
--- /dev/null
+++ b/lib/php/phpseclib/Crypt/Rijndael.php
@@ -0,0 +1,1050 @@
+<?php
+
+/**
+ * Pure-PHP implementation of Rijndael.
+ *
+ * Uses mcrypt, if available/possible, and an internal implementation, otherwise.
+ *
+ * PHP versions 4 and 5
+ *
+ * If {@link self::setBlockLength() setBlockLength()} isn't called, it'll be assumed to be 128 bits.  If
+ * {@link self::setKeyLength() setKeyLength()} isn't called, it'll be calculated from
+ * {@link self::setKey() setKey()}.  ie. if the key is 128-bits, the key length will be 128-bits.  If it's
+ * 136-bits it'll be null-padded to 192-bits and 192 bits will be the key length until
+ * {@link self::setKey() setKey()} is called, again, at which point, it'll be recalculated.
+ *
+ * Not all Rijndael implementations may support 160-bits or 224-bits as the block length / key length.  mcrypt, for example,
+ * does not.  AES, itself, only supports block lengths of 128 and key lengths of 128, 192, and 256.
+ * {@link http://csrc.nist.gov/archive/aes/rijndael/Rijndael-ammended.pdf#page=10 Rijndael-ammended.pdf#page=10} defines the
+ * algorithm for block lengths of 192 and 256 but not for block lengths / key lengths of 160 and 224.  Indeed, 160 and 224
+ * are first defined as valid key / block lengths in
+ * {@link http://csrc.nist.gov/archive/aes/rijndael/Rijndael-ammended.pdf#page=44 Rijndael-ammended.pdf#page=44}:
+ * Extensions: Other block and Cipher Key lengths.
+ * Note: Use of 160/224-bit Keys must be explicitly set by setKeyLength(160) respectively setKeyLength(224).
+ *
+ * {@internal The variable names are the same as those in
+ * {@link http://www.csrc.nist.gov/publications/fips/fips197/fips-197.pdf#page=10 fips-197.pdf#page=10}.}}
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ *    include 'Crypt/Rijndael.php';
+ *
+ *    $rijndael = new Crypt_Rijndael();
+ *
+ *    $rijndael->setKey('abcdefghijklmnop');
+ *
+ *    $size = 10 * 1024;
+ *    $plaintext = '';
+ *    for ($i = 0; $i < $size; $i++) {
+ *        $plaintext.= 'a';
+ *    }
+ *
+ *    echo $rijndael->decrypt($rijndael->encrypt($plaintext));
+ * ?>
+ * </code>
+ *
+ * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @category  Crypt
+ * @package   Crypt_Rijndael
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2008 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+/**
+ * Include Crypt_Base
+ *
+ * Base cipher class
+ */
+if (!class_exists('Crypt_Base')) {
+    include_once 'Base.php';
+}
+
+/**#@+
+ * @access public
+ * @see self::encrypt()
+ * @see self::decrypt()
+ */
+/**
+ * Encrypt / decrypt using the Counter mode.
+ *
+ * Set to -1 since that's what Crypt/Random.php uses to index the CTR mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Counter_.28CTR.29
+ */
+define('CRYPT_RIJNDAEL_MODE_CTR', CRYPT_MODE_CTR);
+/**
+ * Encrypt / decrypt using the Electronic Code Book mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Electronic_codebook_.28ECB.29
+ */
+define('CRYPT_RIJNDAEL_MODE_ECB', CRYPT_MODE_ECB);
+/**
+ * Encrypt / decrypt using the Code Book Chaining mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher-block_chaining_.28CBC.29
+ */
+define('CRYPT_RIJNDAEL_MODE_CBC', CRYPT_MODE_CBC);
+/**
+ * Encrypt / decrypt using the Cipher Feedback mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher_feedback_.28CFB.29
+ */
+define('CRYPT_RIJNDAEL_MODE_CFB', CRYPT_MODE_CFB);
+/**
+ * Encrypt / decrypt using the Cipher Feedback mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Output_feedback_.28OFB.29
+ */
+define('CRYPT_RIJNDAEL_MODE_OFB', CRYPT_MODE_OFB);
+/**#@-*/
+
+/**
+ * Pure-PHP implementation of Rijndael.
+ *
+ * @package Crypt_Rijndael
+ * @author  Jim Wigginton <terrafrost@php.net>
+ * @access  public
+ */
+class Crypt_Rijndael extends Crypt_Base
+{
+    /**
+     * The namespace used by the cipher for its constants.
+     *
+     * @see Crypt_Base::const_namespace
+     * @var string
+     * @access private
+     */
+    var $const_namespace = 'RIJNDAEL';
+
+    /**
+     * The mcrypt specific name of the cipher
+     *
+     * Mcrypt is useable for 128/192/256-bit $block_size/$key_length. For 160/224 not.
+     * Crypt_Rijndael determines automatically whether mcrypt is useable
+     * or not for the current $block_size/$key_length.
+     * In case of, $cipher_name_mcrypt will be set dynamically at run time accordingly.
+     *
+     * @see Crypt_Base::cipher_name_mcrypt
+     * @see Crypt_Base::engine
+     * @see self::isValidEngine()
+     * @var string
+     * @access private
+     */
+    var $cipher_name_mcrypt = 'rijndael-128';
+
+    /**
+     * The default salt used by setPassword()
+     *
+     * @see Crypt_Base::password_default_salt
+     * @see Crypt_Base::setPassword()
+     * @var string
+     * @access private
+     */
+    var $password_default_salt = 'phpseclib';
+
+    /**
+     * The Key Schedule
+     *
+     * @see self::_setup()
+     * @var array
+     * @access private
+     */
+    var $w;
+
+    /**
+     * The Inverse Key Schedule
+     *
+     * @see self::_setup()
+     * @var array
+     * @access private
+     */
+    var $dw;
+
+    /**
+     * The Block Length divided by 32
+     *
+     * @see self::setBlockLength()
+     * @var int
+     * @access private
+     * @internal The max value is 256 / 32 = 8, the min value is 128 / 32 = 4.  Exists in conjunction with $block_size
+     *    because the encryption / decryption / key schedule creation requires this number and not $block_size.  We could
+     *    derive this from $block_size or vice versa, but that'd mean we'd have to do multiple shift operations, so in lieu
+     *    of that, we'll just precompute it once.
+     */
+    var $Nb = 4;
+
+    /**
+     * The Key Length (in bytes)
+     *
+     * @see self::setKeyLength()
+     * @var int
+     * @access private
+     * @internal The max value is 256 / 8 = 32, the min value is 128 / 8 = 16.  Exists in conjunction with $Nk
+     *    because the encryption / decryption / key schedule creation requires this number and not $key_length.  We could
+     *    derive this from $key_length or vice versa, but that'd mean we'd have to do multiple shift operations, so in lieu
+     *    of that, we'll just precompute it once.
+     */
+    var $key_length = 16;
+
+    /**
+     * The Key Length divided by 32
+     *
+     * @see self::setKeyLength()
+     * @var int
+     * @access private
+     * @internal The max value is 256 / 32 = 8, the min value is 128 / 32 = 4
+     */
+    var $Nk = 4;
+
+    /**
+     * The Number of Rounds
+     *
+     * @var int
+     * @access private
+     * @internal The max value is 14, the min value is 10.
+     */
+    var $Nr;
+
+    /**
+     * Shift offsets
+     *
+     * @var array
+     * @access private
+     */
+    var $c;
+
+    /**
+     * Holds the last used key- and block_size information
+     *
+     * @var array
+     * @access private
+     */
+    var $kl;
+
+    /**
+     * Sets the key.
+     *
+     * Keys can be of any length.  Rijndael, itself, requires the use of a key that's between 128-bits and 256-bits long and
+     * whose length is a multiple of 32.  If the key is less than 256-bits and the key length isn't set, we round the length
+     * up to the closest valid key length, padding $key with null bytes.  If the key is more than 256-bits, we trim the
+     * excess bits.
+     *
+     * If the key is not explicitly set, it'll be assumed to be all null bytes.
+     *
+     * Note: 160/224-bit keys must explicitly set by setKeyLength(), otherwise they will be round/pad up to 192/256 bits.
+     *
+     * @see Crypt_Base:setKey()
+     * @see self::setKeyLength()
+     * @access public
+     * @param string $key
+     */
+    function setKey($key)
+    {
+        if (!$this->explicit_key_length) {
+            $length = strlen($key);
+            switch (true) {
+                case $length <= 16:
+                    $this->key_size = 16;
+                    break;
+                case $length <= 20:
+                    $this->key_size = 20;
+                    break;
+                case $length <= 24:
+                    $this->key_size = 24;
+                    break;
+                case $length <= 28:
+                    $this->key_size = 28;
+                    break;
+                default:
+                    $this->key_size = 32;
+            }
+        }
+        parent::setKey($key);
+    }
+
+    /**
+     * Sets the key length
+     *
+     * Valid key lengths are 128, 160, 192, 224, and 256.  If the length is less than 128, it will be rounded up to
+     * 128.  If the length is greater than 128 and invalid, it will be rounded down to the closest valid amount.
+     *
+     * Note: phpseclib extends Rijndael (and AES) for using 160- and 224-bit keys but they are officially not defined
+     *       and the most (if not all) implementations are not able using 160/224-bit keys but round/pad them up to
+     *       192/256 bits as, for example, mcrypt will do.
+     *
+     *       That said, if you want be compatible with other Rijndael and AES implementations,
+     *       you should not setKeyLength(160) or setKeyLength(224).
+     *
+     * Additional: In case of 160- and 224-bit keys, phpseclib will/can, for that reason, not use
+     *             the mcrypt php extension, even if available.
+     *             This results then in slower encryption.
+     *
+     * @access public
+     * @param int $length
+     */
+    function setKeyLength($length)
+    {
+        switch (true) {
+            case $length <= 128:
+                $this->key_length = 16;
+                break;
+            case $length <= 160:
+                $this->key_length = 20;
+                break;
+            case $length <= 192:
+                $this->key_length = 24;
+                break;
+            case $length <= 224:
+                $this->key_length = 28;
+                break;
+            default:
+                $this->key_length = 32;
+        }
+
+        parent::setKeyLength($length);
+    }
+
+    /**
+     * Sets the block length
+     *
+     * Valid block lengths are 128, 160, 192, 224, and 256.  If the length is less than 128, it will be rounded up to
+     * 128.  If the length is greater than 128 and invalid, it will be rounded down to the closest valid amount.
+     *
+     * @access public
+     * @param int $length
+     */
+    function setBlockLength($length)
+    {
+        $length >>= 5;
+        if ($length > 8) {
+            $length = 8;
+        } elseif ($length < 4) {
+            $length = 4;
+        }
+        $this->Nb = $length;
+        $this->block_size = $length << 2;
+        $this->changed = true;
+        $this->_setEngine();
+    }
+
+    /**
+     * Test for engine validity
+     *
+     * This is mainly just a wrapper to set things up for Crypt_Base::isValidEngine()
+     *
+     * @see Crypt_Base::Crypt_Base()
+     * @param int $engine
+     * @access public
+     * @return bool
+     */
+    function isValidEngine($engine)
+    {
+        switch ($engine) {
+            case CRYPT_ENGINE_OPENSSL:
+                if ($this->block_size != 16) {
+                    return false;
+                }
+                $this->cipher_name_openssl_ecb = 'aes-' . ($this->key_length << 3) . '-ecb';
+                $this->cipher_name_openssl = 'aes-' . ($this->key_length << 3) . '-' . $this->_openssl_translate_mode();
+                break;
+            case CRYPT_ENGINE_MCRYPT:
+                $this->cipher_name_mcrypt = 'rijndael-' . ($this->block_size << 3);
+                if ($this->key_length % 8) { // is it a 160/224-bit key?
+                    // mcrypt is not usable for them, only for 128/192/256-bit keys
+                    return false;
+                }
+        }
+
+        return parent::isValidEngine($engine);
+    }
+
+    /**
+     * Encrypts a block
+     *
+     * @access private
+     * @param string $in
+     * @return string
+     */
+    function _encryptBlock($in)
+    {
+        static $tables;
+        if (empty($tables)) {
+            $tables = &$this->_getTables();
+        }
+        $t0   = $tables[0];
+        $t1   = $tables[1];
+        $t2   = $tables[2];
+        $t3   = $tables[3];
+        $sbox = $tables[4];
+
+        $state = array();
+        $words = unpack('N*', $in);
+
+        $c = $this->c;
+        $w = $this->w;
+        $Nb = $this->Nb;
+        $Nr = $this->Nr;
+
+        // addRoundKey
+        $wc = $Nb - 1;
+        foreach ($words as $word) {
+            $state[] = $word ^ $w[++$wc];
+        }
+
+        // fips-197.pdf#page=19, "Figure 5. Pseudo Code for the Cipher", states that this loop has four components -
+        // subBytes, shiftRows, mixColumns, and addRoundKey. fips-197.pdf#page=30, "Implementation Suggestions Regarding
+        // Various Platforms" suggests that performs enhanced implementations are described in Rijndael-ammended.pdf.
+        // Rijndael-ammended.pdf#page=20, "Implementation aspects / 32-bit processor", discusses such an optimization.
+        // Unfortunately, the description given there is not quite correct.  Per aes.spec.v316.pdf#page=19 [1],
+        // equation (7.4.7) is supposed to use addition instead of subtraction, so we'll do that here, as well.
+
+        // [1] http://fp.gladman.plus.com/cryptography_technology/rijndael/aes.spec.v316.pdf
+        $temp = array();
+        for ($round = 1; $round < $Nr; ++$round) {
+            $i = 0; // $c[0] == 0
+            $j = $c[1];
+            $k = $c[2];
+            $l = $c[3];
+
+            while ($i < $Nb) {
+                $temp[$i] = $t0[$state[$i] >> 24 & 0x000000FF] ^
+                            $t1[$state[$j] >> 16 & 0x000000FF] ^
+                            $t2[$state[$k] >>  8 & 0x000000FF] ^
+                            $t3[$state[$l]       & 0x000000FF] ^
+                            $w[++$wc];
+                ++$i;
+                $j = ($j + 1) % $Nb;
+                $k = ($k + 1) % $Nb;
+                $l = ($l + 1) % $Nb;
+            }
+            $state = $temp;
+        }
+
+        // subWord
+        for ($i = 0; $i < $Nb; ++$i) {
+            $state[$i] =   $sbox[$state[$i]       & 0x000000FF]        |
+                          ($sbox[$state[$i] >>  8 & 0x000000FF] <<  8) |
+                          ($sbox[$state[$i] >> 16 & 0x000000FF] << 16) |
+                          ($sbox[$state[$i] >> 24 & 0x000000FF] << 24);
+        }
+
+        // shiftRows + addRoundKey
+        $i = 0; // $c[0] == 0
+        $j = $c[1];
+        $k = $c[2];
+        $l = $c[3];
+        while ($i < $Nb) {
+            $temp[$i] = ($state[$i] & 0xFF000000) ^
+                        ($state[$j] & 0x00FF0000) ^
+                        ($state[$k] & 0x0000FF00) ^
+                        ($state[$l] & 0x000000FF) ^
+                         $w[$i];
+            ++$i;
+            $j = ($j + 1) % $Nb;
+            $k = ($k + 1) % $Nb;
+            $l = ($l + 1) % $Nb;
+        }
+
+        switch ($Nb) {
+            case 8:
+                return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3], $temp[4], $temp[5], $temp[6], $temp[7]);
+            case 7:
+                return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3], $temp[4], $temp[5], $temp[6]);
+            case 6:
+                return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3], $temp[4], $temp[5]);
+            case 5:
+                return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3], $temp[4]);
+            default:
+                return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3]);
+        }
+    }
+
+    /**
+     * Decrypts a block
+     *
+     * @access private
+     * @param string $in
+     * @return string
+     */
+    function _decryptBlock($in)
+    {
+        static $invtables;
+        if (empty($invtables)) {
+            $invtables = &$this->_getInvTables();
+        }
+        $dt0   = $invtables[0];
+        $dt1   = $invtables[1];
+        $dt2   = $invtables[2];
+        $dt3   = $invtables[3];
+        $isbox = $invtables[4];
+
+        $state = array();
+        $words = unpack('N*', $in);
+
+        $c  = $this->c;
+        $dw = $this->dw;
+        $Nb = $this->Nb;
+        $Nr = $this->Nr;
+
+        // addRoundKey
+        $wc = $Nb - 1;
+        foreach ($words as $word) {
+            $state[] = $word ^ $dw[++$wc];
+        }
+
+        $temp = array();
+        for ($round = $Nr - 1; $round > 0; --$round) {
+            $i = 0; // $c[0] == 0
+            $j = $Nb - $c[1];
+            $k = $Nb - $c[2];
+            $l = $Nb - $c[3];
+
+            while ($i < $Nb) {
+                $temp[$i] = $dt0[$state[$i] >> 24 & 0x000000FF] ^
+                            $dt1[$state[$j] >> 16 & 0x000000FF] ^
+                            $dt2[$state[$k] >>  8 & 0x000000FF] ^
+                            $dt3[$state[$l]       & 0x000000FF] ^
+                            $dw[++$wc];
+                ++$i;
+                $j = ($j + 1) % $Nb;
+                $k = ($k + 1) % $Nb;
+                $l = ($l + 1) % $Nb;
+            }
+            $state = $temp;
+        }
+
+        // invShiftRows + invSubWord + addRoundKey
+        $i = 0; // $c[0] == 0
+        $j = $Nb - $c[1];
+        $k = $Nb - $c[2];
+        $l = $Nb - $c[3];
+
+        while ($i < $Nb) {
+            $word = ($state[$i] & 0xFF000000) |
+                    ($state[$j] & 0x00FF0000) |
+                    ($state[$k] & 0x0000FF00) |
+                    ($state[$l] & 0x000000FF);
+
+            $temp[$i] = $dw[$i] ^ ($isbox[$word       & 0x000000FF]        |
+                                  ($isbox[$word >>  8 & 0x000000FF] <<  8) |
+                                  ($isbox[$word >> 16 & 0x000000FF] << 16) |
+                                  ($isbox[$word >> 24 & 0x000000FF] << 24));
+            ++$i;
+            $j = ($j + 1) % $Nb;
+            $k = ($k + 1) % $Nb;
+            $l = ($l + 1) % $Nb;
+        }
+
+        switch ($Nb) {
+            case 8:
+                return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3], $temp[4], $temp[5], $temp[6], $temp[7]);
+            case 7:
+                return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3], $temp[4], $temp[5], $temp[6]);
+            case 6:
+                return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3], $temp[4], $temp[5]);
+            case 5:
+                return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3], $temp[4]);
+            default:
+                return pack('N*', $temp[0], $temp[1], $temp[2], $temp[3]);
+        }
+    }
+
+    /**
+     * Setup the key (expansion)
+     *
+     * @see Crypt_Base::_setupKey()
+     * @access private
+     */
+    function _setupKey()
+    {
+        // Each number in $rcon is equal to the previous number multiplied by two in Rijndael's finite field.
+        // See http://en.wikipedia.org/wiki/Finite_field_arithmetic#Multiplicative_inverse
+        static $rcon = array(0,
+            0x01000000, 0x02000000, 0x04000000, 0x08000000, 0x10000000,
+            0x20000000, 0x40000000, 0x80000000, 0x1B000000, 0x36000000,
+            0x6C000000, 0xD8000000, 0xAB000000, 0x4D000000, 0x9A000000,
+            0x2F000000, 0x5E000000, 0xBC000000, 0x63000000, 0xC6000000,
+            0x97000000, 0x35000000, 0x6A000000, 0xD4000000, 0xB3000000,
+            0x7D000000, 0xFA000000, 0xEF000000, 0xC5000000, 0x91000000
+        );
+
+        if (isset($this->kl['key']) && $this->key === $this->kl['key'] && $this->key_length === $this->kl['key_length'] && $this->block_size === $this->kl['block_size']) {
+            // already expanded
+            return;
+        }
+        $this->kl = array('key' => $this->key, 'key_length' => $this->key_length, 'block_size' => $this->block_size);
+
+        $this->Nk = $this->key_length >> 2;
+        // see Rijndael-ammended.pdf#page=44
+        $this->Nr = max($this->Nk, $this->Nb) + 6;
+
+        // shift offsets for Nb = 5, 7 are defined in Rijndael-ammended.pdf#page=44,
+        //     "Table 8: Shift offsets in Shiftrow for the alternative block lengths"
+        // shift offsets for Nb = 4, 6, 8 are defined in Rijndael-ammended.pdf#page=14,
+        //     "Table 2: Shift offsets for different block lengths"
+        switch ($this->Nb) {
+            case 4:
+            case 5:
+            case 6:
+                $this->c = array(0, 1, 2, 3);
+                break;
+            case 7:
+                $this->c = array(0, 1, 2, 4);
+                break;
+            case 8:
+                $this->c = array(0, 1, 3, 4);
+        }
+
+        $w = array_values(unpack('N*words', $this->key));
+
+        $length = $this->Nb * ($this->Nr + 1);
+        for ($i = $this->Nk; $i < $length; $i++) {
+            $temp = $w[$i - 1];
+            if ($i % $this->Nk == 0) {
+                // according to <http://php.net/language.types.integer>, "the size of an integer is platform-dependent".
+                // on a 32-bit machine, it's 32-bits, and on a 64-bit machine, it's 64-bits. on a 32-bit machine,
+                // 0xFFFFFFFF << 8 == 0xFFFFFF00, but on a 64-bit machine, it equals 0xFFFFFFFF00. as such, doing 'and'
+                // with 0xFFFFFFFF (or 0xFFFFFF00) on a 32-bit machine is unnecessary, but on a 64-bit machine, it is.
+                $temp = (($temp << 8) & 0xFFFFFF00) | (($temp >> 24) & 0x000000FF); // rotWord
+                $temp = $this->_subWord($temp) ^ $rcon[$i / $this->Nk];
+            } elseif ($this->Nk > 6 && $i % $this->Nk == 4) {
+                $temp = $this->_subWord($temp);
+            }
+            $w[$i] = $w[$i - $this->Nk] ^ $temp;
+        }
+
+        // convert the key schedule from a vector of $Nb * ($Nr + 1) length to a matrix with $Nr + 1 rows and $Nb columns
+        // and generate the inverse key schedule.  more specifically,
+        // according to <http://csrc.nist.gov/archive/aes/rijndael/Rijndael-ammended.pdf#page=23> (section 5.3.3),
+        // "The key expansion for the Inverse Cipher is defined as follows:
+        //        1. Apply the Key Expansion.
+        //        2. Apply InvMixColumn to all Round Keys except the first and the last one."
+        // also, see fips-197.pdf#page=27, "5.3.5 Equivalent Inverse Cipher"
+        list($dt0, $dt1, $dt2, $dt3) = $this->_getInvTables();
+        $temp = $this->w = $this->dw = array();
+        for ($i = $row = $col = 0; $i < $length; $i++, $col++) {
+            if ($col == $this->Nb) {
+                if ($row == 0) {
+                    $this->dw[0] = $this->w[0];
+                } else {
+                    // subWord + invMixColumn + invSubWord = invMixColumn
+                    $j = 0;
+                    while ($j < $this->Nb) {
+                        $dw = $this->_subWord($this->w[$row][$j]);
+                        $temp[$j] = $dt0[$dw >> 24 & 0x000000FF] ^
+                                    $dt1[$dw >> 16 & 0x000000FF] ^
+                                    $dt2[$dw >>  8 & 0x000000FF] ^
+                                    $dt3[$dw       & 0x000000FF];
+                        $j++;
+                    }
+                    $this->dw[$row] = $temp;
+                }
+
+                $col = 0;
+                $row++;
+            }
+            $this->w[$row][$col] = $w[$i];
+        }
+
+        $this->dw[$row] = $this->w[$row];
+
+        // Converting to 1-dim key arrays (both ascending)
+        $this->dw = array_reverse($this->dw);
+        $w  = array_pop($this->w);
+        $dw = array_pop($this->dw);
+        foreach ($this->w as $r => $wr) {
+            foreach ($wr as $c => $wc) {
+                $w[]  = $wc;
+                $dw[] = $this->dw[$r][$c];
+            }
+        }
+        $this->w  = $w;
+        $this->dw = $dw;
+    }
+
+    /**
+     * Performs S-Box substitutions
+     *
+     * @access private
+     * @param int $word
+     */
+    function _subWord($word)
+    {
+        static $sbox;
+        if (empty($sbox)) {
+            list(, , , , $sbox) = $this->_getTables();
+        }
+
+        return  $sbox[$word       & 0x000000FF]        |
+               ($sbox[$word >>  8 & 0x000000FF] <<  8) |
+               ($sbox[$word >> 16 & 0x000000FF] << 16) |
+               ($sbox[$word >> 24 & 0x000000FF] << 24);
+    }
+
+    /**
+     * Provides the mixColumns and sboxes tables
+     *
+     * @see Crypt_Rijndael:_encryptBlock()
+     * @see Crypt_Rijndael:_setupInlineCrypt()
+     * @see Crypt_Rijndael:_subWord()
+     * @access private
+     * @return array &$tables
+     */
+    function &_getTables()
+    {
+        static $tables;
+        if (empty($tables)) {
+            // according to <http://csrc.nist.gov/archive/aes/rijndael/Rijndael-ammended.pdf#page=19> (section 5.2.1),
+            // precomputed tables can be used in the mixColumns phase. in that example, they're assigned t0...t3, so
+            // those are the names we'll use.
+            $t3 = array_map('intval', array(
+                // with array_map('intval', ...) we ensure we have only int's and not
+                // some slower floats converted by php automatically on high values
+                0x6363A5C6, 0x7C7C84F8, 0x777799EE, 0x7B7B8DF6, 0xF2F20DFF, 0x6B6BBDD6, 0x6F6FB1DE, 0xC5C55491,
+                0x30305060, 0x01010302, 0x6767A9CE, 0x2B2B7D56, 0xFEFE19E7, 0xD7D762B5, 0xABABE64D, 0x76769AEC,
+                0xCACA458F, 0x82829D1F, 0xC9C94089, 0x7D7D87FA, 0xFAFA15EF, 0x5959EBB2, 0x4747C98E, 0xF0F00BFB,
+                0xADADEC41, 0xD4D467B3, 0xA2A2FD5F, 0xAFAFEA45, 0x9C9CBF23, 0xA4A4F753, 0x727296E4, 0xC0C05B9B,
+                0xB7B7C275, 0xFDFD1CE1, 0x9393AE3D, 0x26266A4C, 0x36365A6C, 0x3F3F417E, 0xF7F702F5, 0xCCCC4F83,
+                0x34345C68, 0xA5A5F451, 0xE5E534D1, 0xF1F108F9, 0x717193E2, 0xD8D873AB, 0x31315362, 0x15153F2A,
+                0x04040C08, 0xC7C75295, 0x23236546, 0xC3C35E9D, 0x18182830, 0x9696A137, 0x05050F0A, 0x9A9AB52F,
+                0x0707090E, 0x12123624, 0x80809B1B, 0xE2E23DDF, 0xEBEB26CD, 0x2727694E, 0xB2B2CD7F, 0x75759FEA,
+                0x09091B12, 0x83839E1D, 0x2C2C7458, 0x1A1A2E34, 0x1B1B2D36, 0x6E6EB2DC, 0x5A5AEEB4, 0xA0A0FB5B,
+                0x5252F6A4, 0x3B3B4D76, 0xD6D661B7, 0xB3B3CE7D, 0x29297B52, 0xE3E33EDD, 0x2F2F715E, 0x84849713,
+                0x5353F5A6, 0xD1D168B9, 0x00000000, 0xEDED2CC1, 0x20206040, 0xFCFC1FE3, 0xB1B1C879, 0x5B5BEDB6,
+                0x6A6ABED4, 0xCBCB468D, 0xBEBED967, 0x39394B72, 0x4A4ADE94, 0x4C4CD498, 0x5858E8B0, 0xCFCF4A85,
+                0xD0D06BBB, 0xEFEF2AC5, 0xAAAAE54F, 0xFBFB16ED, 0x4343C586, 0x4D4DD79A, 0x33335566, 0x85859411,
+                0x4545CF8A, 0xF9F910E9, 0x02020604, 0x7F7F81FE, 0x5050F0A0, 0x3C3C4478, 0x9F9FBA25, 0xA8A8E34B,
+                0x5151F3A2, 0xA3A3FE5D, 0x4040C080, 0x8F8F8A05, 0x9292AD3F, 0x9D9DBC21, 0x38384870, 0xF5F504F1,
+                0xBCBCDF63, 0xB6B6C177, 0xDADA75AF, 0x21216342, 0x10103020, 0xFFFF1AE5, 0xF3F30EFD, 0xD2D26DBF,
+                0xCDCD4C81, 0x0C0C1418, 0x13133526, 0xECEC2FC3, 0x5F5FE1BE, 0x9797A235, 0x4444CC88, 0x1717392E,
+                0xC4C45793, 0xA7A7F255, 0x7E7E82FC, 0x3D3D477A, 0x6464ACC8, 0x5D5DE7BA, 0x19192B32, 0x737395E6,
+                0x6060A0C0, 0x81819819, 0x4F4FD19E, 0xDCDC7FA3, 0x22226644, 0x2A2A7E54, 0x9090AB3B, 0x8888830B,
+                0x4646CA8C, 0xEEEE29C7, 0xB8B8D36B, 0x14143C28, 0xDEDE79A7, 0x5E5EE2BC, 0x0B0B1D16, 0xDBDB76AD,
+                0xE0E03BDB, 0x32325664, 0x3A3A4E74, 0x0A0A1E14, 0x4949DB92, 0x06060A0C, 0x24246C48, 0x5C5CE4B8,
+                0xC2C25D9F, 0xD3D36EBD, 0xACACEF43, 0x6262A6C4, 0x9191A839, 0x9595A431, 0xE4E437D3, 0x79798BF2,
+                0xE7E732D5, 0xC8C8438B, 0x3737596E, 0x6D6DB7DA, 0x8D8D8C01, 0xD5D564B1, 0x4E4ED29C, 0xA9A9E049,
+                0x6C6CB4D8, 0x5656FAAC, 0xF4F407F3, 0xEAEA25CF, 0x6565AFCA, 0x7A7A8EF4, 0xAEAEE947, 0x08081810,
+                0xBABAD56F, 0x787888F0, 0x25256F4A, 0x2E2E725C, 0x1C1C2438, 0xA6A6F157, 0xB4B4C773, 0xC6C65197,
+                0xE8E823CB, 0xDDDD7CA1, 0x74749CE8, 0x1F1F213E, 0x4B4BDD96, 0xBDBDDC61, 0x8B8B860D, 0x8A8A850F,
+                0x707090E0, 0x3E3E427C, 0xB5B5C471, 0x6666AACC, 0x4848D890, 0x03030506, 0xF6F601F7, 0x0E0E121C,
+                0x6161A3C2, 0x35355F6A, 0x5757F9AE, 0xB9B9D069, 0x86869117, 0xC1C15899, 0x1D1D273A, 0x9E9EB927,
+                0xE1E138D9, 0xF8F813EB, 0x9898B32B, 0x11113322, 0x6969BBD2, 0xD9D970A9, 0x8E8E8907, 0x9494A733,
+                0x9B9BB62D, 0x1E1E223C, 0x87879215, 0xE9E920C9, 0xCECE4987, 0x5555FFAA, 0x28287850, 0xDFDF7AA5,
+                0x8C8C8F03, 0xA1A1F859, 0x89898009, 0x0D0D171A, 0xBFBFDA65, 0xE6E631D7, 0x4242C684, 0x6868B8D0,
+                0x4141C382, 0x9999B029, 0x2D2D775A, 0x0F0F111E, 0xB0B0CB7B, 0x5454FCA8, 0xBBBBD66D, 0x16163A2C
+            ));
+
+            foreach ($t3 as $t3i) {
+                $t0[] = (($t3i << 24) & 0xFF000000) | (($t3i >>  8) & 0x00FFFFFF);
+                $t1[] = (($t3i << 16) & 0xFFFF0000) | (($t3i >> 16) & 0x0000FFFF);
+                $t2[] = (($t3i <<  8) & 0xFFFFFF00) | (($t3i >> 24) & 0x000000FF);
+            }
+
+            $tables = array(
+                // The Precomputed mixColumns tables t0 - t3
+                $t0,
+                $t1,
+                $t2,
+                $t3,
+                // The SubByte S-Box
+                array(
+                    0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76,
+                    0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0,
+                    0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15,
+                    0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75,
+                    0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0, 0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84,
+                    0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B, 0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF,
+                    0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, 0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8,
+                    0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5, 0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2,
+                    0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73,
+                    0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB,
+                    0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C, 0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79,
+                    0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08,
+                    0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A,
+                    0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E, 0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E,
+                    0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94, 0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF,
+                    0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, 0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16
+                )
+            );
+        }
+        return $tables;
+    }
+
+    /**
+     * Provides the inverse mixColumns and inverse sboxes tables
+     *
+     * @see Crypt_Rijndael:_decryptBlock()
+     * @see Crypt_Rijndael:_setupInlineCrypt()
+     * @see Crypt_Rijndael:_setupKey()
+     * @access private
+     * @return array &$tables
+     */
+    function &_getInvTables()
+    {
+        static $tables;
+        if (empty($tables)) {
+            $dt3 = array_map('intval', array(
+                0xF4A75051, 0x4165537E, 0x17A4C31A, 0x275E963A, 0xAB6BCB3B, 0x9D45F11F, 0xFA58ABAC, 0xE303934B,
+                0x30FA5520, 0x766DF6AD, 0xCC769188, 0x024C25F5, 0xE5D7FC4F, 0x2ACBD7C5, 0x35448026, 0x62A38FB5,
+                0xB15A49DE, 0xBA1B6725, 0xEA0E9845, 0xFEC0E15D, 0x2F7502C3, 0x4CF01281, 0x4697A38D, 0xD3F9C66B,
+                0x8F5FE703, 0x929C9515, 0x6D7AEBBF, 0x5259DA95, 0xBE832DD4, 0x7421D358, 0xE0692949, 0xC9C8448E,
+                0xC2896A75, 0x8E7978F4, 0x583E6B99, 0xB971DD27, 0xE14FB6BE, 0x88AD17F0, 0x20AC66C9, 0xCE3AB47D,
+                0xDF4A1863, 0x1A3182E5, 0x51336097, 0x537F4562, 0x6477E0B1, 0x6BAE84BB, 0x81A01CFE, 0x082B94F9,
+                0x48685870, 0x45FD198F, 0xDE6C8794, 0x7BF8B752, 0x73D323AB, 0x4B02E272, 0x1F8F57E3, 0x55AB2A66,
+                0xEB2807B2, 0xB5C2032F, 0xC57B9A86, 0x3708A5D3, 0x2887F230, 0xBFA5B223, 0x036ABA02, 0x16825CED,
+                0xCF1C2B8A, 0x79B492A7, 0x07F2F0F3, 0x69E2A14E, 0xDAF4CD65, 0x05BED506, 0x34621FD1, 0xA6FE8AC4,
+                0x2E539D34, 0xF355A0A2, 0x8AE13205, 0xF6EB75A4, 0x83EC390B, 0x60EFAA40, 0x719F065E, 0x6E1051BD,
+                0x218AF93E, 0xDD063D96, 0x3E05AEDD, 0xE6BD464D, 0x548DB591, 0xC45D0571, 0x06D46F04, 0x5015FF60,
+                0x98FB2419, 0xBDE997D6, 0x4043CC89, 0xD99E7767, 0xE842BDB0, 0x898B8807, 0x195B38E7, 0xC8EEDB79,
+                0x7C0A47A1, 0x420FE97C, 0x841EC9F8, 0x00000000, 0x80868309, 0x2BED4832, 0x1170AC1E, 0x5A724E6C,
+                0x0EFFFBFD, 0x8538560F, 0xAED51E3D, 0x2D392736, 0x0FD9640A, 0x5CA62168, 0x5B54D19B, 0x362E3A24,
+                0x0A67B10C, 0x57E70F93, 0xEE96D2B4, 0x9B919E1B, 0xC0C54F80, 0xDC20A261, 0x774B695A, 0x121A161C,
+                0x93BA0AE2, 0xA02AE5C0, 0x22E0433C, 0x1B171D12, 0x090D0B0E, 0x8BC7ADF2, 0xB6A8B92D, 0x1EA9C814,
+                0xF1198557, 0x75074CAF, 0x99DDBBEE, 0x7F60FDA3, 0x01269FF7, 0x72F5BC5C, 0x663BC544, 0xFB7E345B,
+                0x4329768B, 0x23C6DCCB, 0xEDFC68B6, 0xE4F163B8, 0x31DCCAD7, 0x63851042, 0x97224013, 0xC6112084,
+                0x4A247D85, 0xBB3DF8D2, 0xF93211AE, 0x29A16DC7, 0x9E2F4B1D, 0xB230F3DC, 0x8652EC0D, 0xC1E3D077,
+                0xB3166C2B, 0x70B999A9, 0x9448FA11, 0xE9642247, 0xFC8CC4A8, 0xF03F1AA0, 0x7D2CD856, 0x3390EF22,
+                0x494EC787, 0x38D1C1D9, 0xCAA2FE8C, 0xD40B3698, 0xF581CFA6, 0x7ADE28A5, 0xB78E26DA, 0xADBFA43F,
+                0x3A9DE42C, 0x78920D50, 0x5FCC9B6A, 0x7E466254, 0x8D13C2F6, 0xD8B8E890, 0x39F75E2E, 0xC3AFF582,
+                0x5D80BE9F, 0xD0937C69, 0xD52DA96F, 0x2512B3CF, 0xAC993BC8, 0x187DA710, 0x9C636EE8, 0x3BBB7BDB,
+                0x267809CD, 0x5918F46E, 0x9AB701EC, 0x4F9AA883, 0x956E65E6, 0xFFE67EAA, 0xBCCF0821, 0x15E8E6EF,
+                0xE79BD9BA, 0x6F36CE4A, 0x9F09D4EA, 0xB07CD629, 0xA4B2AF31, 0x3F23312A, 0xA59430C6, 0xA266C035,
+                0x4EBC3774, 0x82CAA6FC, 0x90D0B0E0, 0xA7D81533, 0x04984AF1, 0xECDAF741, 0xCD500E7F, 0x91F62F17,
+                0x4DD68D76, 0xEFB04D43, 0xAA4D54CC, 0x9604DFE4, 0xD1B5E39E, 0x6A881B4C, 0x2C1FB8C1, 0x65517F46,
+                0x5EEA049D, 0x8C355D01, 0x877473FA, 0x0B412EFB, 0x671D5AB3, 0xDBD25292, 0x105633E9, 0xD647136D,
+                0xD7618C9A, 0xA10C7A37, 0xF8148E59, 0x133C89EB, 0xA927EECE, 0x61C935B7, 0x1CE5EDE1, 0x47B13C7A,
+                0xD2DF599C, 0xF2733F55, 0x14CE7918, 0xC737BF73, 0xF7CDEA53, 0xFDAA5B5F, 0x3D6F14DF, 0x44DB8678,
+                0xAFF381CA, 0x68C43EB9, 0x24342C38, 0xA3405FC2, 0x1DC37216, 0xE2250CBC, 0x3C498B28, 0x0D9541FF,
+                0xA8017139, 0x0CB3DE08, 0xB4E49CD8, 0x56C19064, 0xCB84617B, 0x32B670D5, 0x6C5C7448, 0xB85742D0
+            ));
+
+            foreach ($dt3 as $dt3i) {
+                $dt0[] = (($dt3i << 24) & 0xFF000000) | (($dt3i >>  8) & 0x00FFFFFF);
+                $dt1[] = (($dt3i << 16) & 0xFFFF0000) | (($dt3i >> 16) & 0x0000FFFF);
+                $dt2[] = (($dt3i <<  8) & 0xFFFFFF00) | (($dt3i >> 24) & 0x000000FF);
+            };
+
+            $tables = array(
+                // The Precomputed inverse mixColumns tables dt0 - dt3
+                $dt0,
+                $dt1,
+                $dt2,
+                $dt3,
+                // The inverse SubByte S-Box
+                array(
+                    0x52, 0x09, 0x6A, 0xD5, 0x30, 0x36, 0xA5, 0x38, 0xBF, 0x40, 0xA3, 0x9E, 0x81, 0xF3, 0xD7, 0xFB,
+                    0x7C, 0xE3, 0x39, 0x82, 0x9B, 0x2F, 0xFF, 0x87, 0x34, 0x8E, 0x43, 0x44, 0xC4, 0xDE, 0xE9, 0xCB,
+                    0x54, 0x7B, 0x94, 0x32, 0xA6, 0xC2, 0x23, 0x3D, 0xEE, 0x4C, 0x95, 0x0B, 0x42, 0xFA, 0xC3, 0x4E,
+                    0x08, 0x2E, 0xA1, 0x66, 0x28, 0xD9, 0x24, 0xB2, 0x76, 0x5B, 0xA2, 0x49, 0x6D, 0x8B, 0xD1, 0x25,
+                    0x72, 0xF8, 0xF6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xD4, 0xA4, 0x5C, 0xCC, 0x5D, 0x65, 0xB6, 0x92,
+                    0x6C, 0x70, 0x48, 0x50, 0xFD, 0xED, 0xB9, 0xDA, 0x5E, 0x15, 0x46, 0x57, 0xA7, 0x8D, 0x9D, 0x84,
+                    0x90, 0xD8, 0xAB, 0x00, 0x8C, 0xBC, 0xD3, 0x0A, 0xF7, 0xE4, 0x58, 0x05, 0xB8, 0xB3, 0x45, 0x06,
+                    0xD0, 0x2C, 0x1E, 0x8F, 0xCA, 0x3F, 0x0F, 0x02, 0xC1, 0xAF, 0xBD, 0x03, 0x01, 0x13, 0x8A, 0x6B,
+                    0x3A, 0x91, 0x11, 0x41, 0x4F, 0x67, 0xDC, 0xEA, 0x97, 0xF2, 0xCF, 0xCE, 0xF0, 0xB4, 0xE6, 0x73,
+                    0x96, 0xAC, 0x74, 0x22, 0xE7, 0xAD, 0x35, 0x85, 0xE2, 0xF9, 0x37, 0xE8, 0x1C, 0x75, 0xDF, 0x6E,
+                    0x47, 0xF1, 0x1A, 0x71, 0x1D, 0x29, 0xC5, 0x89, 0x6F, 0xB7, 0x62, 0x0E, 0xAA, 0x18, 0xBE, 0x1B,
+                    0xFC, 0x56, 0x3E, 0x4B, 0xC6, 0xD2, 0x79, 0x20, 0x9A, 0xDB, 0xC0, 0xFE, 0x78, 0xCD, 0x5A, 0xF4,
+                    0x1F, 0xDD, 0xA8, 0x33, 0x88, 0x07, 0xC7, 0x31, 0xB1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xEC, 0x5F,
+                    0x60, 0x51, 0x7F, 0xA9, 0x19, 0xB5, 0x4A, 0x0D, 0x2D, 0xE5, 0x7A, 0x9F, 0x93, 0xC9, 0x9C, 0xEF,
+                    0xA0, 0xE0, 0x3B, 0x4D, 0xAE, 0x2A, 0xF5, 0xB0, 0xC8, 0xEB, 0xBB, 0x3C, 0x83, 0x53, 0x99, 0x61,
+                    0x17, 0x2B, 0x04, 0x7E, 0xBA, 0x77, 0xD6, 0x26, 0xE1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0C, 0x7D
+                )
+            );
+        }
+        return $tables;
+    }
+
+    /**
+     * Setup the performance-optimized function for de/encrypt()
+     *
+     * @see Crypt_Base::_setupInlineCrypt()
+     * @access private
+     */
+    function _setupInlineCrypt()
+    {
+        // Note: _setupInlineCrypt() will be called only if $this->changed === true
+        // So here we are'nt under the same heavy timing-stress as we are in _de/encryptBlock() or de/encrypt().
+        // However...the here generated function- $code, stored as php callback in $this->inline_crypt, must work as fast as even possible.
+
+        $lambda_functions =& Crypt_Rijndael::_getLambdaFunctions();
+
+        // We create max. 10 hi-optimized code for memory reason. Means: For each $key one ultra fast inline-crypt function.
+        // (Currently, for Crypt_Rijndael/AES, one generated $lambda_function cost on php5.5@32bit ~80kb unfreeable mem and ~130kb on php5.5@64bit)
+        // After that, we'll still create very fast optimized code but not the hi-ultimative code, for each $mode one.
+        $gen_hi_opt_code = (bool)(count($lambda_functions) < 10);
+
+        // Generation of a uniqe hash for our generated code
+        $code_hash = "Crypt_Rijndael, {$this->mode}, {$this->Nr}, {$this->Nb}";
+        if ($gen_hi_opt_code) {
+            $code_hash = str_pad($code_hash, 32) . $this->_hashInlineCryptFunction($this->key);
+        }
+
+        if (!isset($lambda_functions[$code_hash])) {
+            switch (true) {
+                case $gen_hi_opt_code:
+                    // The hi-optimized $lambda_functions will use the key-words hardcoded for better performance.
+                    $w  = $this->w;
+                    $dw = $this->dw;
+                    $init_encrypt = '';
+                    $init_decrypt = '';
+                    break;
+                default:
+                    for ($i = 0, $cw = count($this->w); $i < $cw; ++$i) {
+                        $w[]  = '$w['  . $i . ']';
+                        $dw[] = '$dw[' . $i . ']';
+                    }
+                    $init_encrypt = '$w  = $self->w;';
+                    $init_decrypt = '$dw = $self->dw;';
+            }
+
+            $Nr = $this->Nr;
+            $Nb = $this->Nb;
+            $c  = $this->c;
+
+            // Generating encrypt code:
+            $init_encrypt.= '
+                static $tables;
+                if (empty($tables)) {
+                    $tables = &$self->_getTables();
+                }
+                $t0   = $tables[0];
+                $t1   = $tables[1];
+                $t2   = $tables[2];
+                $t3   = $tables[3];
+                $sbox = $tables[4];
+            ';
+
+            $s  = 'e';
+            $e  = 's';
+            $wc = $Nb - 1;
+
+            // Preround: addRoundKey
+            $encrypt_block = '$in = unpack("N*", $in);'."\n";
+            for ($i = 0; $i < $Nb; ++$i) {
+                $encrypt_block .= '$s'.$i.' = $in['.($i + 1).'] ^ '.$w[++$wc].";\n";
+            }
+
+            // Mainrounds: shiftRows + subWord + mixColumns + addRoundKey
+            for ($round = 1; $round < $Nr; ++$round) {
+                list($s, $e) = array($e, $s);
+                for ($i = 0; $i < $Nb; ++$i) {
+                    $encrypt_block.=
+                        '$'.$e.$i.' =
+                        $t0[($'.$s.$i                  .' >> 24) & 0xff] ^
+                        $t1[($'.$s.(($i + $c[1]) % $Nb).' >> 16) & 0xff] ^
+                        $t2[($'.$s.(($i + $c[2]) % $Nb).' >>  8) & 0xff] ^
+                        $t3[ $'.$s.(($i + $c[3]) % $Nb).'        & 0xff] ^
+                        '.$w[++$wc].";\n";
+                }
+            }
+
+            // Finalround: subWord + shiftRows + addRoundKey
+            for ($i = 0; $i < $Nb; ++$i) {
+                $encrypt_block.=
+                    '$'.$e.$i.' =
+                     $sbox[ $'.$e.$i.'        & 0xff]        |
+                    ($sbox[($'.$e.$i.' >>  8) & 0xff] <<  8) |
+                    ($sbox[($'.$e.$i.' >> 16) & 0xff] << 16) |
+                    ($sbox[($'.$e.$i.' >> 24) & 0xff] << 24);'."\n";
+            }
+            $encrypt_block .= '$in = pack("N*"'."\n";
+            for ($i = 0; $i < $Nb; ++$i) {
+                $encrypt_block.= ',
+                    ($'.$e.$i                  .' & '.((int)0xFF000000).') ^
+                    ($'.$e.(($i + $c[1]) % $Nb).' &         0x00FF0000   ) ^
+                    ($'.$e.(($i + $c[2]) % $Nb).' &         0x0000FF00   ) ^
+                    ($'.$e.(($i + $c[3]) % $Nb).' &         0x000000FF   ) ^
+                    '.$w[$i]."\n";
+            }
+            $encrypt_block .= ');';
+
+            // Generating decrypt code:
+            $init_decrypt.= '
+                static $invtables;
+                if (empty($invtables)) {
+                    $invtables = &$self->_getInvTables();
+                }
+                $dt0   = $invtables[0];
+                $dt1   = $invtables[1];
+                $dt2   = $invtables[2];
+                $dt3   = $invtables[3];
+                $isbox = $invtables[4];
+            ';
+
+            $s  = 'e';
+            $e  = 's';
+            $wc = $Nb - 1;
+
+            // Preround: addRoundKey
+            $decrypt_block = '$in = unpack("N*", $in);'."\n";
+            for ($i = 0; $i < $Nb; ++$i) {
+                $decrypt_block .= '$s'.$i.' = $in['.($i + 1).'] ^ '.$dw[++$wc].';'."\n";
+            }
+
+            // Mainrounds: shiftRows + subWord + mixColumns + addRoundKey
+            for ($round = 1; $round < $Nr; ++$round) {
+                list($s, $e) = array($e, $s);
+                for ($i = 0; $i < $Nb; ++$i) {
+                    $decrypt_block.=
+                        '$'.$e.$i.' =
+                        $dt0[($'.$s.$i                        .' >> 24) & 0xff] ^
+                        $dt1[($'.$s.(($Nb + $i - $c[1]) % $Nb).' >> 16) & 0xff] ^
+                        $dt2[($'.$s.(($Nb + $i - $c[2]) % $Nb).' >>  8) & 0xff] ^
+                        $dt3[ $'.$s.(($Nb + $i - $c[3]) % $Nb).'        & 0xff] ^
+                        '.$dw[++$wc].";\n";
+                }
+            }
+
+            // Finalround: subWord + shiftRows + addRoundKey
+            for ($i = 0; $i < $Nb; ++$i) {
+                $decrypt_block.=
+                    '$'.$e.$i.' =
+                     $isbox[ $'.$e.$i.'        & 0xff]        |
+                    ($isbox[($'.$e.$i.' >>  8) & 0xff] <<  8) |
+                    ($isbox[($'.$e.$i.' >> 16) & 0xff] << 16) |
+                    ($isbox[($'.$e.$i.' >> 24) & 0xff] << 24);'."\n";
+            }
+            $decrypt_block .= '$in = pack("N*"'."\n";
+            for ($i = 0; $i < $Nb; ++$i) {
+                $decrypt_block.= ',
+                    ($'.$e.$i.                        ' & '.((int)0xFF000000).') ^
+                    ($'.$e.(($Nb + $i - $c[1]) % $Nb).' &         0x00FF0000   ) ^
+                    ($'.$e.(($Nb + $i - $c[2]) % $Nb).' &         0x0000FF00   ) ^
+                    ($'.$e.(($Nb + $i - $c[3]) % $Nb).' &         0x000000FF   ) ^
+                    '.$dw[$i]."\n";
+            }
+            $decrypt_block .= ');';
+
+            $lambda_functions[$code_hash] = $this->_createInlineCryptFunction(
+                array(
+                   'init_crypt'    => '',
+                   'init_encrypt'  => $init_encrypt,
+                   'init_decrypt'  => $init_decrypt,
+                   'encrypt_block' => $encrypt_block,
+                   'decrypt_block' => $decrypt_block
+                )
+            );
+        }
+        $this->inline_crypt = $lambda_functions[$code_hash];
+    }
+}
diff --git a/lib/php/phpseclib/Crypt/TripleDES.php b/lib/php/phpseclib/Crypt/TripleDES.php
new file mode 100644
index 00000000..2aa684a0
--- /dev/null
+++ b/lib/php/phpseclib/Crypt/TripleDES.php
@@ -0,0 +1,517 @@
+<?php
+
+/**
+ * Pure-PHP implementation of Triple DES.
+ *
+ * Uses mcrypt, if available, and an internal implementation, otherwise.  Operates in the EDE3 mode (encrypt-decrypt-encrypt).
+ *
+ * PHP versions 4 and 5
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ *    include 'Crypt/TripleDES.php';
+ *
+ *    $des = new Crypt_TripleDES();
+ *
+ *    $des->setKey('abcdefghijklmnopqrstuvwx');
+ *
+ *    $size = 10 * 1024;
+ *    $plaintext = '';
+ *    for ($i = 0; $i < $size; $i++) {
+ *        $plaintext.= 'a';
+ *    }
+ *
+ *    echo $des->decrypt($des->encrypt($plaintext));
+ * ?>
+ * </code>
+ *
+ * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @category  Crypt
+ * @package   Crypt_TripleDES
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2007 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+/**
+ * Include Crypt_DES
+ */
+if (!class_exists('Crypt_DES')) {
+    include_once 'DES.php';
+}
+
+/**#@+
+ * @access public
+ * @see self::Crypt_TripleDES()
+ */
+/**
+ * Encrypt / decrypt using inner chaining
+ *
+ * Inner chaining is used by SSH-1 and is generally considered to be less secure then outer chaining (CRYPT_DES_MODE_CBC3).
+ */
+define('CRYPT_MODE_3CBC', -2);
+/**
+ * BC version of the above.
+ */
+define('CRYPT_DES_MODE_3CBC', -2);
+/**
+ * Encrypt / decrypt using outer chaining
+ *
+ * Outer chaining is used by SSH-2 and when the mode is set to CRYPT_DES_MODE_CBC.
+ */
+define('CRYPT_MODE_CBC3', CRYPT_MODE_CBC);
+/**
+ * BC version of the above.
+ */
+define('CRYPT_DES_MODE_CBC3', CRYPT_MODE_CBC3);
+/**#@-*/
+
+/**
+ * Pure-PHP implementation of Triple DES.
+ *
+ * @package Crypt_TripleDES
+ * @author  Jim Wigginton <terrafrost@php.net>
+ * @access  public
+ */
+class Crypt_TripleDES extends Crypt_DES
+{
+    /**
+     * Key Length (in bytes)
+     *
+     * @see Crypt_TripleDES::setKeyLength()
+     * @var int
+     * @access private
+     */
+    var $key_length = 24;
+
+    /**
+     * The default salt used by setPassword()
+     *
+     * @see Crypt_Base::password_default_salt
+     * @see Crypt_Base::setPassword()
+     * @var string
+     * @access private
+     */
+    var $password_default_salt = 'phpseclib';
+
+    /**
+     * The namespace used by the cipher for its constants.
+     *
+     * @see Crypt_DES::const_namespace
+     * @see Crypt_Base::const_namespace
+     * @var string
+     * @access private
+     */
+    var $const_namespace = 'DES';
+
+    /**
+     * The mcrypt specific name of the cipher
+     *
+     * @see Crypt_DES::cipher_name_mcrypt
+     * @see Crypt_Base::cipher_name_mcrypt
+     * @var string
+     * @access private
+     */
+    var $cipher_name_mcrypt = 'tripledes';
+
+    /**
+     * Optimizing value while CFB-encrypting
+     *
+     * @see Crypt_Base::cfb_init_len
+     * @var int
+     * @access private
+     */
+    var $cfb_init_len = 750;
+
+    /**
+     * max possible size of $key
+     *
+     * @see self::setKey()
+     * @see Crypt_DES::setKey()
+     * @var string
+     * @access private
+     */
+    var $key_length_max = 24;
+
+    /**
+     * Internal flag whether using CRYPT_DES_MODE_3CBC or not
+     *
+     * @var bool
+     * @access private
+     */
+    var $mode_3cbc;
+
+    /**
+     * The Crypt_DES objects
+     *
+     * Used only if $mode_3cbc === true
+     *
+     * @var array
+     * @access private
+     */
+    var $des;
+
+    /**
+     * Default Constructor.
+     *
+     * Determines whether or not the mcrypt extension should be used.
+     *
+     * $mode could be:
+     *
+     * - CRYPT_DES_MODE_ECB
+     *
+     * - CRYPT_DES_MODE_CBC
+     *
+     * - CRYPT_DES_MODE_CTR
+     *
+     * - CRYPT_DES_MODE_CFB
+     *
+     * - CRYPT_DES_MODE_OFB
+     *
+     * - CRYPT_DES_MODE_3CBC
+     *
+     * If not explicitly set, CRYPT_DES_MODE_CBC will be used.
+     *
+     * @see Crypt_DES::Crypt_DES()
+     * @see Crypt_Base::Crypt_Base()
+     * @param int $mode
+     * @access public
+     */
+    function __construct($mode = CRYPT_MODE_CBC)
+    {
+        switch ($mode) {
+            // In case of CRYPT_DES_MODE_3CBC, we init as CRYPT_DES_MODE_CBC
+            // and additional flag us internally as 3CBC
+            case CRYPT_DES_MODE_3CBC:
+                parent::Crypt_Base(CRYPT_MODE_CBC);
+                $this->mode_3cbc = true;
+
+                // This three $des'es will do the 3CBC work (if $key > 64bits)
+                $this->des = array(
+                    new Crypt_DES(CRYPT_MODE_CBC),
+                    new Crypt_DES(CRYPT_MODE_CBC),
+                    new Crypt_DES(CRYPT_MODE_CBC),
+                );
+
+                // we're going to be doing the padding, ourselves, so disable it in the Crypt_DES objects
+                $this->des[0]->disablePadding();
+                $this->des[1]->disablePadding();
+                $this->des[2]->disablePadding();
+                break;
+            // If not 3CBC, we init as usual
+            default:
+                parent::__construct($mode);
+        }
+    }
+
+    /**
+     * PHP4 compatible Default Constructor.
+     *
+     * @see self::__construct()
+     * @param int $mode
+     * @access public
+     */
+    function Crypt_TripleDES($mode = CRYPT_MODE_CBC)
+    {
+        $this->__construct($mode);
+    }
+
+    /**
+     * Test for engine validity
+     *
+     * This is mainly just a wrapper to set things up for Crypt_Base::isValidEngine()
+     *
+     * @see Crypt_Base::Crypt_Base()
+     * @param int $engine
+     * @access public
+     * @return bool
+     */
+    function isValidEngine($engine)
+    {
+        if ($engine == CRYPT_ENGINE_OPENSSL) {
+            $this->cipher_name_openssl_ecb = 'des-ede3';
+            $mode = $this->_openssl_translate_mode();
+            $this->cipher_name_openssl = $mode == 'ecb' ? 'des-ede3' : 'des-ede3-' . $mode;
+        }
+
+        return parent::isValidEngine($engine);
+    }
+
+    /**
+     * Sets the initialization vector. (optional)
+     *
+     * SetIV is not required when CRYPT_DES_MODE_ECB is being used.  If not explicitly set, it'll be assumed
+     * to be all zero's.
+     *
+     * @see Crypt_Base::setIV()
+     * @access public
+     * @param string $iv
+     */
+    function setIV($iv)
+    {
+        parent::setIV($iv);
+        if ($this->mode_3cbc) {
+            $this->des[0]->setIV($iv);
+            $this->des[1]->setIV($iv);
+            $this->des[2]->setIV($iv);
+        }
+    }
+
+    /**
+     * Sets the key length.
+     *
+     * Valid key lengths are 64, 128 and 192
+     *
+     * @see Crypt_Base:setKeyLength()
+     * @access public
+     * @param int $length
+     */
+    function setKeyLength($length)
+    {
+        $length >>= 3;
+        switch (true) {
+            case $length <= 8:
+                $this->key_length = 8;
+                break;
+            case $length <= 16:
+                $this->key_length = 16;
+                break;
+            default:
+                $this->key_length = 24;
+        }
+
+        parent::setKeyLength($length);
+    }
+
+    /**
+     * Sets the key.
+     *
+     * Keys can be of any length.  Triple DES, itself, can use 128-bit (eg. strlen($key) == 16) or
+     * 192-bit (eg. strlen($key) == 24) keys.  This function pads and truncates $key as appropriate.
+     *
+     * DES also requires that every eighth bit be a parity bit, however, we'll ignore that.
+     *
+     * If the key is not explicitly set, it'll be assumed to be all null bytes.
+     *
+     * @access public
+     * @see Crypt_DES::setKey()
+     * @see Crypt_Base::setKey()
+     * @param string $key
+     */
+    function setKey($key)
+    {
+        $length = $this->explicit_key_length ? $this->key_length : strlen($key);
+        if ($length > 8) {
+            $key = str_pad(substr($key, 0, 24), 24, chr(0));
+            // if $key is between 64 and 128-bits, use the first 64-bits as the last, per this:
+            // http://php.net/function.mcrypt-encrypt#47973
+            $key = $length <= 16 ? substr_replace($key, substr($key, 0, 8), 16) : substr($key, 0, 24);
+        } else {
+            $key = str_pad($key, 8, chr(0));
+        }
+        parent::setKey($key);
+
+        // And in case of CRYPT_DES_MODE_3CBC:
+        // if key <= 64bits we not need the 3 $des to work,
+        // because we will then act as regular DES-CBC with just a <= 64bit key.
+        // So only if the key > 64bits (> 8 bytes) we will call setKey() for the 3 $des.
+        if ($this->mode_3cbc && $length > 8) {
+            $this->des[0]->setKey(substr($key,  0, 8));
+            $this->des[1]->setKey(substr($key,  8, 8));
+            $this->des[2]->setKey(substr($key, 16, 8));
+        }
+    }
+
+    /**
+     * Encrypts a message.
+     *
+     * @see Crypt_Base::encrypt()
+     * @access public
+     * @param string $plaintext
+     * @return string $cipertext
+     */
+    function encrypt($plaintext)
+    {
+        // parent::en/decrypt() is able to do all the work for all modes and keylengths,
+        // except for: CRYPT_MODE_3CBC (inner chaining CBC) with a key > 64bits
+
+        // if the key is smaller then 8, do what we'd normally do
+        if ($this->mode_3cbc && strlen($this->key) > 8) {
+            return $this->des[2]->encrypt(
+                $this->des[1]->decrypt(
+                    $this->des[0]->encrypt(
+                        $this->_pad($plaintext)
+                    )
+                )
+            );
+        }
+
+        return parent::encrypt($plaintext);
+    }
+
+    /**
+     * Decrypts a message.
+     *
+     * @see Crypt_Base::decrypt()
+     * @access public
+     * @param string $ciphertext
+     * @return string $plaintext
+     */
+    function decrypt($ciphertext)
+    {
+        if ($this->mode_3cbc && strlen($this->key) > 8) {
+            return $this->_unpad(
+                $this->des[0]->decrypt(
+                    $this->des[1]->encrypt(
+                        $this->des[2]->decrypt(
+                            str_pad($ciphertext, (strlen($ciphertext) + 7) & 0xFFFFFFF8, "\0")
+                        )
+                    )
+                )
+            );
+        }
+
+        return parent::decrypt($ciphertext);
+    }
+
+    /**
+     * Treat consecutive "packets" as if they are a continuous buffer.
+     *
+     * Say you have a 16-byte plaintext $plaintext.  Using the default behavior, the two following code snippets
+     * will yield different outputs:
+     *
+     * <code>
+     *    echo $des->encrypt(substr($plaintext, 0, 8));
+     *    echo $des->encrypt(substr($plaintext, 8, 8));
+     * </code>
+     * <code>
+     *    echo $des->encrypt($plaintext);
+     * </code>
+     *
+     * The solution is to enable the continuous buffer.  Although this will resolve the above discrepancy, it creates
+     * another, as demonstrated with the following:
+     *
+     * <code>
+     *    $des->encrypt(substr($plaintext, 0, 8));
+     *    echo $des->decrypt($des->encrypt(substr($plaintext, 8, 8)));
+     * </code>
+     * <code>
+     *    echo $des->decrypt($des->encrypt(substr($plaintext, 8, 8)));
+     * </code>
+     *
+     * With the continuous buffer disabled, these would yield the same output.  With it enabled, they yield different
+     * outputs.  The reason is due to the fact that the initialization vector's change after every encryption /
+     * decryption round when the continuous buffer is enabled.  When it's disabled, they remain constant.
+     *
+     * Put another way, when the continuous buffer is enabled, the state of the Crypt_DES() object changes after each
+     * encryption / decryption round, whereas otherwise, it'd remain constant.  For this reason, it's recommended that
+     * continuous buffers not be used.  They do offer better security and are, in fact, sometimes required (SSH uses them),
+     * however, they are also less intuitive and more likely to cause you problems.
+     *
+     * @see Crypt_Base::enableContinuousBuffer()
+     * @see self::disableContinuousBuffer()
+     * @access public
+     */
+    function enableContinuousBuffer()
+    {
+        parent::enableContinuousBuffer();
+        if ($this->mode_3cbc) {
+            $this->des[0]->enableContinuousBuffer();
+            $this->des[1]->enableContinuousBuffer();
+            $this->des[2]->enableContinuousBuffer();
+        }
+    }
+
+    /**
+     * Treat consecutive packets as if they are a discontinuous buffer.
+     *
+     * The default behavior.
+     *
+     * @see Crypt_Base::disableContinuousBuffer()
+     * @see self::enableContinuousBuffer()
+     * @access public
+     */
+    function disableContinuousBuffer()
+    {
+        parent::disableContinuousBuffer();
+        if ($this->mode_3cbc) {
+            $this->des[0]->disableContinuousBuffer();
+            $this->des[1]->disableContinuousBuffer();
+            $this->des[2]->disableContinuousBuffer();
+        }
+    }
+
+    /**
+     * Creates the key schedule
+     *
+     * @see Crypt_DES::_setupKey()
+     * @see Crypt_Base::_setupKey()
+     * @access private
+     */
+    function _setupKey()
+    {
+        switch (true) {
+            // if $key <= 64bits we configure our internal pure-php cipher engine
+            // to act as regular [1]DES, not as 3DES. mcrypt.so::tripledes does the same.
+            case strlen($this->key) <= 8:
+                $this->des_rounds = 1;
+                break;
+
+            // otherwise, if $key > 64bits, we configure our engine to work as 3DES.
+            default:
+                $this->des_rounds = 3;
+
+                // (only) if 3CBC is used we have, of course, to setup the $des[0-2] keys also separately.
+                if ($this->mode_3cbc) {
+                    $this->des[0]->_setupKey();
+                    $this->des[1]->_setupKey();
+                    $this->des[2]->_setupKey();
+
+                    // because $des[0-2] will, now, do all the work we can return here
+                    // not need unnecessary stress parent::_setupKey() with our, now unused, $key.
+                    return;
+                }
+        }
+        // setup our key
+        parent::_setupKey();
+    }
+
+    /**
+     * Sets the internal crypt engine
+     *
+     * @see Crypt_Base::Crypt_Base()
+     * @see Crypt_Base::setPreferredEngine()
+     * @param int $engine
+     * @access public
+     * @return int
+     */
+    function setPreferredEngine($engine)
+    {
+        if ($this->mode_3cbc) {
+            $this->des[0]->setPreferredEngine($engine);
+            $this->des[1]->setPreferredEngine($engine);
+            $this->des[2]->setPreferredEngine($engine);
+        }
+
+        return parent::setPreferredEngine($engine);
+    }
+}
diff --git a/lib/php/phpseclib/Crypt/Twofish.php b/lib/php/phpseclib/Crypt/Twofish.php
new file mode 100644
index 00000000..cf628a4a
--- /dev/null
+++ b/lib/php/phpseclib/Crypt/Twofish.php
@@ -0,0 +1,889 @@
+<?php
+
+/**
+ * Pure-PHP implementation of Twofish.
+ *
+ * Uses mcrypt, if available, and an internal implementation, otherwise.
+ *
+ * PHP versions 4 and 5
+ *
+ * Useful resources are as follows:
+ *
+ *  - {@link http://en.wikipedia.org/wiki/Twofish Wikipedia description of Twofish}
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ *    include 'Crypt/Twofish.php';
+ *
+ *    $twofish = new Crypt_Twofish();
+ *
+ *    $twofish->setKey('12345678901234567890123456789012');
+ *
+ *    $plaintext = str_repeat('a', 1024);
+ *
+ *    echo $twofish->decrypt($twofish->encrypt($plaintext));
+ * ?>
+ * </code>
+ *
+ * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @category  Crypt
+ * @package   Crypt_Twofish
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @author    Hans-Juergen Petrich <petrich@tronic-media.com>
+ * @copyright 2007 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+/**
+ * Include Crypt_Base
+ *
+ * Base cipher class
+ */
+if (!class_exists('Crypt_Base')) {
+    include_once 'Base.php';
+}
+
+/**#@+
+ * @access public
+ * @see self::encrypt()
+ * @see self::decrypt()
+ */
+/**
+ * Encrypt / decrypt using the Counter mode.
+ *
+ * Set to -1 since that's what Crypt/Random.php uses to index the CTR mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Counter_.28CTR.29
+ */
+define('CRYPT_TWOFISH_MODE_CTR', CRYPT_MODE_CTR);
+/**
+ * Encrypt / decrypt using the Electronic Code Book mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Electronic_codebook_.28ECB.29
+ */
+define('CRYPT_TWOFISH_MODE_ECB', CRYPT_MODE_ECB);
+/**
+ * Encrypt / decrypt using the Code Book Chaining mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher-block_chaining_.28CBC.29
+ */
+define('CRYPT_TWOFISH_MODE_CBC', CRYPT_MODE_CBC);
+/**
+ * Encrypt / decrypt using the Cipher Feedback mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher_feedback_.28CFB.29
+ */
+define('CRYPT_TWOFISH_MODE_CFB', CRYPT_MODE_CFB);
+/**
+ * Encrypt / decrypt using the Cipher Feedback mode.
+ *
+ * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Output_feedback_.28OFB.29
+ */
+define('CRYPT_TWOFISH_MODE_OFB', CRYPT_MODE_OFB);
+/**#@-*/
+
+/**
+ * Pure-PHP implementation of Twofish.
+ *
+ * @package Crypt_Twofish
+ * @author  Jim Wigginton <terrafrost@php.net>
+ * @author  Hans-Juergen Petrich <petrich@tronic-media.com>
+ * @access  public
+ */
+class Crypt_Twofish extends Crypt_Base
+{
+    /**
+     * The namespace used by the cipher for its constants.
+     *
+     * @see Crypt_Base::const_namespace
+     * @var string
+     * @access private
+     */
+    var $const_namespace = 'TWOFISH';
+
+    /**
+     * The mcrypt specific name of the cipher
+     *
+     * @see Crypt_Base::cipher_name_mcrypt
+     * @var string
+     * @access private
+     */
+    var $cipher_name_mcrypt = 'twofish';
+
+    /**
+     * Optimizing value while CFB-encrypting
+     *
+     * @see Crypt_Base::cfb_init_len
+     * @var int
+     * @access private
+     */
+    var $cfb_init_len = 800;
+
+    /**
+     * Q-Table
+     *
+     * @var array
+     * @access private
+     */
+    var $q0 = array(
+        0xA9, 0x67, 0xB3, 0xE8, 0x04, 0xFD, 0xA3, 0x76,
+        0x9A, 0x92, 0x80, 0x78, 0xE4, 0xDD, 0xD1, 0x38,
+        0x0D, 0xC6, 0x35, 0x98, 0x18, 0xF7, 0xEC, 0x6C,
+        0x43, 0x75, 0x37, 0x26, 0xFA, 0x13, 0x94, 0x48,
+        0xF2, 0xD0, 0x8B, 0x30, 0x84, 0x54, 0xDF, 0x23,
+        0x19, 0x5B, 0x3D, 0x59, 0xF3, 0xAE, 0xA2, 0x82,
+        0x63, 0x01, 0x83, 0x2E, 0xD9, 0x51, 0x9B, 0x7C,
+        0xA6, 0xEB, 0xA5, 0xBE, 0x16, 0x0C, 0xE3, 0x61,
+        0xC0, 0x8C, 0x3A, 0xF5, 0x73, 0x2C, 0x25, 0x0B,
+        0xBB, 0x4E, 0x89, 0x6B, 0x53, 0x6A, 0xB4, 0xF1,
+        0xE1, 0xE6, 0xBD, 0x45, 0xE2, 0xF4, 0xB6, 0x66,
+        0xCC, 0x95, 0x03, 0x56, 0xD4, 0x1C, 0x1E, 0xD7,
+        0xFB, 0xC3, 0x8E, 0xB5, 0xE9, 0xCF, 0xBF, 0xBA,
+        0xEA, 0x77, 0x39, 0xAF, 0x33, 0xC9, 0x62, 0x71,
+        0x81, 0x79, 0x09, 0xAD, 0x24, 0xCD, 0xF9, 0xD8,
+        0xE5, 0xC5, 0xB9, 0x4D, 0x44, 0x08, 0x86, 0xE7,
+        0xA1, 0x1D, 0xAA, 0xED, 0x06, 0x70, 0xB2, 0xD2,
+        0x41, 0x7B, 0xA0, 0x11, 0x31, 0xC2, 0x27, 0x90,
+        0x20, 0xF6, 0x60, 0xFF, 0x96, 0x5C, 0xB1, 0xAB,
+        0x9E, 0x9C, 0x52, 0x1B, 0x5F, 0x93, 0x0A, 0xEF,
+        0x91, 0x85, 0x49, 0xEE, 0x2D, 0x4F, 0x8F, 0x3B,
+        0x47, 0x87, 0x6D, 0x46, 0xD6, 0x3E, 0x69, 0x64,
+        0x2A, 0xCE, 0xCB, 0x2F, 0xFC, 0x97, 0x05, 0x7A,
+        0xAC, 0x7F, 0xD5, 0x1A, 0x4B, 0x0E, 0xA7, 0x5A,
+        0x28, 0x14, 0x3F, 0x29, 0x88, 0x3C, 0x4C, 0x02,
+        0xB8, 0xDA, 0xB0, 0x17, 0x55, 0x1F, 0x8A, 0x7D,
+        0x57, 0xC7, 0x8D, 0x74, 0xB7, 0xC4, 0x9F, 0x72,
+        0x7E, 0x15, 0x22, 0x12, 0x58, 0x07, 0x99, 0x34,
+        0x6E, 0x50, 0xDE, 0x68, 0x65, 0xBC, 0xDB, 0xF8,
+        0xC8, 0xA8, 0x2B, 0x40, 0xDC, 0xFE, 0x32, 0xA4,
+        0xCA, 0x10, 0x21, 0xF0, 0xD3, 0x5D, 0x0F, 0x00,
+        0x6F, 0x9D, 0x36, 0x42, 0x4A, 0x5E, 0xC1, 0xE0
+    );
+
+    /**
+     * Q-Table
+     *
+     * @var array
+     * @access private
+     */
+    var $q1 = array(
+        0x75, 0xF3, 0xC6, 0xF4, 0xDB, 0x7B, 0xFB, 0xC8,
+        0x4A, 0xD3, 0xE6, 0x6B, 0x45, 0x7D, 0xE8, 0x4B,
+        0xD6, 0x32, 0xD8, 0xFD, 0x37, 0x71, 0xF1, 0xE1,
+        0x30, 0x0F, 0xF8, 0x1B, 0x87, 0xFA, 0x06, 0x3F,
+        0x5E, 0xBA, 0xAE, 0x5B, 0x8A, 0x00, 0xBC, 0x9D,
+        0x6D, 0xC1, 0xB1, 0x0E, 0x80, 0x5D, 0xD2, 0xD5,
+        0xA0, 0x84, 0x07, 0x14, 0xB5, 0x90, 0x2C, 0xA3,
+        0xB2, 0x73, 0x4C, 0x54, 0x92, 0x74, 0x36, 0x51,
+        0x38, 0xB0, 0xBD, 0x5A, 0xFC, 0x60, 0x62, 0x96,
+        0x6C, 0x42, 0xF7, 0x10, 0x7C, 0x28, 0x27, 0x8C,
+        0x13, 0x95, 0x9C, 0xC7, 0x24, 0x46, 0x3B, 0x70,
+        0xCA, 0xE3, 0x85, 0xCB, 0x11, 0xD0, 0x93, 0xB8,
+        0xA6, 0x83, 0x20, 0xFF, 0x9F, 0x77, 0xC3, 0xCC,
+        0x03, 0x6F, 0x08, 0xBF, 0x40, 0xE7, 0x2B, 0xE2,
+        0x79, 0x0C, 0xAA, 0x82, 0x41, 0x3A, 0xEA, 0xB9,
+        0xE4, 0x9A, 0xA4, 0x97, 0x7E, 0xDA, 0x7A, 0x17,
+        0x66, 0x94, 0xA1, 0x1D, 0x3D, 0xF0, 0xDE, 0xB3,
+        0x0B, 0x72, 0xA7, 0x1C, 0xEF, 0xD1, 0x53, 0x3E,
+        0x8F, 0x33, 0x26, 0x5F, 0xEC, 0x76, 0x2A, 0x49,
+        0x81, 0x88, 0xEE, 0x21, 0xC4, 0x1A, 0xEB, 0xD9,
+        0xC5, 0x39, 0x99, 0xCD, 0xAD, 0x31, 0x8B, 0x01,
+        0x18, 0x23, 0xDD, 0x1F, 0x4E, 0x2D, 0xF9, 0x48,
+        0x4F, 0xF2, 0x65, 0x8E, 0x78, 0x5C, 0x58, 0x19,
+        0x8D, 0xE5, 0x98, 0x57, 0x67, 0x7F, 0x05, 0x64,
+        0xAF, 0x63, 0xB6, 0xFE, 0xF5, 0xB7, 0x3C, 0xA5,
+        0xCE, 0xE9, 0x68, 0x44, 0xE0, 0x4D, 0x43, 0x69,
+        0x29, 0x2E, 0xAC, 0x15, 0x59, 0xA8, 0x0A, 0x9E,
+        0x6E, 0x47, 0xDF, 0x34, 0x35, 0x6A, 0xCF, 0xDC,
+        0x22, 0xC9, 0xC0, 0x9B, 0x89, 0xD4, 0xED, 0xAB,
+        0x12, 0xA2, 0x0D, 0x52, 0xBB, 0x02, 0x2F, 0xA9,
+        0xD7, 0x61, 0x1E, 0xB4, 0x50, 0x04, 0xF6, 0xC2,
+        0x16, 0x25, 0x86, 0x56, 0x55, 0x09, 0xBE, 0x91
+    );
+
+    /**
+     * M-Table
+     *
+     * @var array
+     * @access private
+     */
+    var $m0 = array(
+        0xBCBC3275, 0xECEC21F3, 0x202043C6, 0xB3B3C9F4, 0xDADA03DB, 0x02028B7B, 0xE2E22BFB, 0x9E9EFAC8,
+        0xC9C9EC4A, 0xD4D409D3, 0x18186BE6, 0x1E1E9F6B, 0x98980E45, 0xB2B2387D, 0xA6A6D2E8, 0x2626B74B,
+        0x3C3C57D6, 0x93938A32, 0x8282EED8, 0x525298FD, 0x7B7BD437, 0xBBBB3771, 0x5B5B97F1, 0x474783E1,
+        0x24243C30, 0x5151E20F, 0xBABAC6F8, 0x4A4AF31B, 0xBFBF4887, 0x0D0D70FA, 0xB0B0B306, 0x7575DE3F,
+        0xD2D2FD5E, 0x7D7D20BA, 0x666631AE, 0x3A3AA35B, 0x59591C8A, 0x00000000, 0xCDCD93BC, 0x1A1AE09D,
+        0xAEAE2C6D, 0x7F7FABC1, 0x2B2BC7B1, 0xBEBEB90E, 0xE0E0A080, 0x8A8A105D, 0x3B3B52D2, 0x6464BAD5,
+        0xD8D888A0, 0xE7E7A584, 0x5F5FE807, 0x1B1B1114, 0x2C2CC2B5, 0xFCFCB490, 0x3131272C, 0x808065A3,
+        0x73732AB2, 0x0C0C8173, 0x79795F4C, 0x6B6B4154, 0x4B4B0292, 0x53536974, 0x94948F36, 0x83831F51,
+        0x2A2A3638, 0xC4C49CB0, 0x2222C8BD, 0xD5D5F85A, 0xBDBDC3FC, 0x48487860, 0xFFFFCE62, 0x4C4C0796,
+        0x4141776C, 0xC7C7E642, 0xEBEB24F7, 0x1C1C1410, 0x5D5D637C, 0x36362228, 0x6767C027, 0xE9E9AF8C,
+        0x4444F913, 0x1414EA95, 0xF5F5BB9C, 0xCFCF18C7, 0x3F3F2D24, 0xC0C0E346, 0x7272DB3B, 0x54546C70,
+        0x29294CCA, 0xF0F035E3, 0x0808FE85, 0xC6C617CB, 0xF3F34F11, 0x8C8CE4D0, 0xA4A45993, 0xCACA96B8,
+        0x68683BA6, 0xB8B84D83, 0x38382820, 0xE5E52EFF, 0xADAD569F, 0x0B0B8477, 0xC8C81DC3, 0x9999FFCC,
+        0x5858ED03, 0x19199A6F, 0x0E0E0A08, 0x95957EBF, 0x70705040, 0xF7F730E7, 0x6E6ECF2B, 0x1F1F6EE2,
+        0xB5B53D79, 0x09090F0C, 0x616134AA, 0x57571682, 0x9F9F0B41, 0x9D9D803A, 0x111164EA, 0x2525CDB9,
+        0xAFAFDDE4, 0x4545089A, 0xDFDF8DA4, 0xA3A35C97, 0xEAEAD57E, 0x353558DA, 0xEDEDD07A, 0x4343FC17,
+        0xF8F8CB66, 0xFBFBB194, 0x3737D3A1, 0xFAFA401D, 0xC2C2683D, 0xB4B4CCF0, 0x32325DDE, 0x9C9C71B3,
+        0x5656E70B, 0xE3E3DA72, 0x878760A7, 0x15151B1C, 0xF9F93AEF, 0x6363BFD1, 0x3434A953, 0x9A9A853E,
+        0xB1B1428F, 0x7C7CD133, 0x88889B26, 0x3D3DA65F, 0xA1A1D7EC, 0xE4E4DF76, 0x8181942A, 0x91910149,
+        0x0F0FFB81, 0xEEEEAA88, 0x161661EE, 0xD7D77321, 0x9797F5C4, 0xA5A5A81A, 0xFEFE3FEB, 0x6D6DB5D9,
+        0x7878AEC5, 0xC5C56D39, 0x1D1DE599, 0x7676A4CD, 0x3E3EDCAD, 0xCBCB6731, 0xB6B6478B, 0xEFEF5B01,
+        0x12121E18, 0x6060C523, 0x6A6AB0DD, 0x4D4DF61F, 0xCECEE94E, 0xDEDE7C2D, 0x55559DF9, 0x7E7E5A48,
+        0x2121B24F, 0x03037AF2, 0xA0A02665, 0x5E5E198E, 0x5A5A6678, 0x65654B5C, 0x62624E58, 0xFDFD4519,
+        0x0606F48D, 0x404086E5, 0xF2F2BE98, 0x3333AC57, 0x17179067, 0x05058E7F, 0xE8E85E05, 0x4F4F7D64,
+        0x89896AAF, 0x10109563, 0x74742FB6, 0x0A0A75FE, 0x5C5C92F5, 0x9B9B74B7, 0x2D2D333C, 0x3030D6A5,
+        0x2E2E49CE, 0x494989E9, 0x46467268, 0x77775544, 0xA8A8D8E0, 0x9696044D, 0x2828BD43, 0xA9A92969,
+        0xD9D97929, 0x8686912E, 0xD1D187AC, 0xF4F44A15, 0x8D8D1559, 0xD6D682A8, 0xB9B9BC0A, 0x42420D9E,
+        0xF6F6C16E, 0x2F2FB847, 0xDDDD06DF, 0x23233934, 0xCCCC6235, 0xF1F1C46A, 0xC1C112CF, 0x8585EBDC,
+        0x8F8F9E22, 0x7171A1C9, 0x9090F0C0, 0xAAAA539B, 0x0101F189, 0x8B8BE1D4, 0x4E4E8CED, 0x8E8E6FAB,
+        0xABABA212, 0x6F6F3EA2, 0xE6E6540D, 0xDBDBF252, 0x92927BBB, 0xB7B7B602, 0x6969CA2F, 0x3939D9A9,
+        0xD3D30CD7, 0xA7A72361, 0xA2A2AD1E, 0xC3C399B4, 0x6C6C4450, 0x07070504, 0x04047FF6, 0x272746C2,
+        0xACACA716, 0xD0D07625, 0x50501386, 0xDCDCF756, 0x84841A55, 0xE1E15109, 0x7A7A25BE, 0x1313EF91
+    );
+
+    /**
+     * M-Table
+     *
+     * @var array
+     * @access private
+     */
+    var $m1 = array(
+        0xA9D93939, 0x67901717, 0xB3719C9C, 0xE8D2A6A6, 0x04050707, 0xFD985252, 0xA3658080, 0x76DFE4E4,
+        0x9A084545, 0x92024B4B, 0x80A0E0E0, 0x78665A5A, 0xE4DDAFAF, 0xDDB06A6A, 0xD1BF6363, 0x38362A2A,
+        0x0D54E6E6, 0xC6432020, 0x3562CCCC, 0x98BEF2F2, 0x181E1212, 0xF724EBEB, 0xECD7A1A1, 0x6C774141,
+        0x43BD2828, 0x7532BCBC, 0x37D47B7B, 0x269B8888, 0xFA700D0D, 0x13F94444, 0x94B1FBFB, 0x485A7E7E,
+        0xF27A0303, 0xD0E48C8C, 0x8B47B6B6, 0x303C2424, 0x84A5E7E7, 0x54416B6B, 0xDF06DDDD, 0x23C56060,
+        0x1945FDFD, 0x5BA33A3A, 0x3D68C2C2, 0x59158D8D, 0xF321ECEC, 0xAE316666, 0xA23E6F6F, 0x82165757,
+        0x63951010, 0x015BEFEF, 0x834DB8B8, 0x2E918686, 0xD9B56D6D, 0x511F8383, 0x9B53AAAA, 0x7C635D5D,
+        0xA63B6868, 0xEB3FFEFE, 0xA5D63030, 0xBE257A7A, 0x16A7ACAC, 0x0C0F0909, 0xE335F0F0, 0x6123A7A7,
+        0xC0F09090, 0x8CAFE9E9, 0x3A809D9D, 0xF5925C5C, 0x73810C0C, 0x2C273131, 0x2576D0D0, 0x0BE75656,
+        0xBB7B9292, 0x4EE9CECE, 0x89F10101, 0x6B9F1E1E, 0x53A93434, 0x6AC4F1F1, 0xB499C3C3, 0xF1975B5B,
+        0xE1834747, 0xE66B1818, 0xBDC82222, 0x450E9898, 0xE26E1F1F, 0xF4C9B3B3, 0xB62F7474, 0x66CBF8F8,
+        0xCCFF9999, 0x95EA1414, 0x03ED5858, 0x56F7DCDC, 0xD4E18B8B, 0x1C1B1515, 0x1EADA2A2, 0xD70CD3D3,
+        0xFB2BE2E2, 0xC31DC8C8, 0x8E195E5E, 0xB5C22C2C, 0xE9894949, 0xCF12C1C1, 0xBF7E9595, 0xBA207D7D,
+        0xEA641111, 0x77840B0B, 0x396DC5C5, 0xAF6A8989, 0x33D17C7C, 0xC9A17171, 0x62CEFFFF, 0x7137BBBB,
+        0x81FB0F0F, 0x793DB5B5, 0x0951E1E1, 0xADDC3E3E, 0x242D3F3F, 0xCDA47676, 0xF99D5555, 0xD8EE8282,
+        0xE5864040, 0xC5AE7878, 0xB9CD2525, 0x4D049696, 0x44557777, 0x080A0E0E, 0x86135050, 0xE730F7F7,
+        0xA1D33737, 0x1D40FAFA, 0xAA346161, 0xED8C4E4E, 0x06B3B0B0, 0x706C5454, 0xB22A7373, 0xD2523B3B,
+        0x410B9F9F, 0x7B8B0202, 0xA088D8D8, 0x114FF3F3, 0x3167CBCB, 0xC2462727, 0x27C06767, 0x90B4FCFC,
+        0x20283838, 0xF67F0404, 0x60784848, 0xFF2EE5E5, 0x96074C4C, 0x5C4B6565, 0xB1C72B2B, 0xAB6F8E8E,
+        0x9E0D4242, 0x9CBBF5F5, 0x52F2DBDB, 0x1BF34A4A, 0x5FA63D3D, 0x9359A4A4, 0x0ABCB9B9, 0xEF3AF9F9,
+        0x91EF1313, 0x85FE0808, 0x49019191, 0xEE611616, 0x2D7CDEDE, 0x4FB22121, 0x8F42B1B1, 0x3BDB7272,
+        0x47B82F2F, 0x8748BFBF, 0x6D2CAEAE, 0x46E3C0C0, 0xD6573C3C, 0x3E859A9A, 0x6929A9A9, 0x647D4F4F,
+        0x2A948181, 0xCE492E2E, 0xCB17C6C6, 0x2FCA6969, 0xFCC3BDBD, 0x975CA3A3, 0x055EE8E8, 0x7AD0EDED,
+        0xAC87D1D1, 0x7F8E0505, 0xD5BA6464, 0x1AA8A5A5, 0x4BB72626, 0x0EB9BEBE, 0xA7608787, 0x5AF8D5D5,
+        0x28223636, 0x14111B1B, 0x3FDE7575, 0x2979D9D9, 0x88AAEEEE, 0x3C332D2D, 0x4C5F7979, 0x02B6B7B7,
+        0xB896CACA, 0xDA583535, 0xB09CC4C4, 0x17FC4343, 0x551A8484, 0x1FF64D4D, 0x8A1C5959, 0x7D38B2B2,
+        0x57AC3333, 0xC718CFCF, 0x8DF40606, 0x74695353, 0xB7749B9B, 0xC4F59797, 0x9F56ADAD, 0x72DAE3E3,
+        0x7ED5EAEA, 0x154AF4F4, 0x229E8F8F, 0x12A2ABAB, 0x584E6262, 0x07E85F5F, 0x99E51D1D, 0x34392323,
+        0x6EC1F6F6, 0x50446C6C, 0xDE5D3232, 0x68724646, 0x6526A0A0, 0xBC93CDCD, 0xDB03DADA, 0xF8C6BABA,
+        0xC8FA9E9E, 0xA882D6D6, 0x2BCF6E6E, 0x40507070, 0xDCEB8585, 0xFE750A0A, 0x328A9393, 0xA48DDFDF,
+        0xCA4C2929, 0x10141C1C, 0x2173D7D7, 0xF0CCB4B4, 0xD309D4D4, 0x5D108A8A, 0x0FE25151, 0x00000000,
+        0x6F9A1919, 0x9DE01A1A, 0x368F9494, 0x42E6C7C7, 0x4AECC9C9, 0x5EFDD2D2, 0xC1AB7F7F, 0xE0D8A8A8
+    );
+
+    /**
+     * M-Table
+     *
+     * @var array
+     * @access private
+     */
+    var $m2 = array(
+        0xBC75BC32, 0xECF3EC21, 0x20C62043, 0xB3F4B3C9, 0xDADBDA03, 0x027B028B, 0xE2FBE22B, 0x9EC89EFA,
+        0xC94AC9EC, 0xD4D3D409, 0x18E6186B, 0x1E6B1E9F, 0x9845980E, 0xB27DB238, 0xA6E8A6D2, 0x264B26B7,
+        0x3CD63C57, 0x9332938A, 0x82D882EE, 0x52FD5298, 0x7B377BD4, 0xBB71BB37, 0x5BF15B97, 0x47E14783,
+        0x2430243C, 0x510F51E2, 0xBAF8BAC6, 0x4A1B4AF3, 0xBF87BF48, 0x0DFA0D70, 0xB006B0B3, 0x753F75DE,
+        0xD25ED2FD, 0x7DBA7D20, 0x66AE6631, 0x3A5B3AA3, 0x598A591C, 0x00000000, 0xCDBCCD93, 0x1A9D1AE0,
+        0xAE6DAE2C, 0x7FC17FAB, 0x2BB12BC7, 0xBE0EBEB9, 0xE080E0A0, 0x8A5D8A10, 0x3BD23B52, 0x64D564BA,
+        0xD8A0D888, 0xE784E7A5, 0x5F075FE8, 0x1B141B11, 0x2CB52CC2, 0xFC90FCB4, 0x312C3127, 0x80A38065,
+        0x73B2732A, 0x0C730C81, 0x794C795F, 0x6B546B41, 0x4B924B02, 0x53745369, 0x9436948F, 0x8351831F,
+        0x2A382A36, 0xC4B0C49C, 0x22BD22C8, 0xD55AD5F8, 0xBDFCBDC3, 0x48604878, 0xFF62FFCE, 0x4C964C07,
+        0x416C4177, 0xC742C7E6, 0xEBF7EB24, 0x1C101C14, 0x5D7C5D63, 0x36283622, 0x672767C0, 0xE98CE9AF,
+        0x441344F9, 0x149514EA, 0xF59CF5BB, 0xCFC7CF18, 0x3F243F2D, 0xC046C0E3, 0x723B72DB, 0x5470546C,
+        0x29CA294C, 0xF0E3F035, 0x088508FE, 0xC6CBC617, 0xF311F34F, 0x8CD08CE4, 0xA493A459, 0xCAB8CA96,
+        0x68A6683B, 0xB883B84D, 0x38203828, 0xE5FFE52E, 0xAD9FAD56, 0x0B770B84, 0xC8C3C81D, 0x99CC99FF,
+        0x580358ED, 0x196F199A, 0x0E080E0A, 0x95BF957E, 0x70407050, 0xF7E7F730, 0x6E2B6ECF, 0x1FE21F6E,
+        0xB579B53D, 0x090C090F, 0x61AA6134, 0x57825716, 0x9F419F0B, 0x9D3A9D80, 0x11EA1164, 0x25B925CD,
+        0xAFE4AFDD, 0x459A4508, 0xDFA4DF8D, 0xA397A35C, 0xEA7EEAD5, 0x35DA3558, 0xED7AEDD0, 0x431743FC,
+        0xF866F8CB, 0xFB94FBB1, 0x37A137D3, 0xFA1DFA40, 0xC23DC268, 0xB4F0B4CC, 0x32DE325D, 0x9CB39C71,
+        0x560B56E7, 0xE372E3DA, 0x87A78760, 0x151C151B, 0xF9EFF93A, 0x63D163BF, 0x345334A9, 0x9A3E9A85,
+        0xB18FB142, 0x7C337CD1, 0x8826889B, 0x3D5F3DA6, 0xA1ECA1D7, 0xE476E4DF, 0x812A8194, 0x91499101,
+        0x0F810FFB, 0xEE88EEAA, 0x16EE1661, 0xD721D773, 0x97C497F5, 0xA51AA5A8, 0xFEEBFE3F, 0x6DD96DB5,
+        0x78C578AE, 0xC539C56D, 0x1D991DE5, 0x76CD76A4, 0x3EAD3EDC, 0xCB31CB67, 0xB68BB647, 0xEF01EF5B,
+        0x1218121E, 0x602360C5, 0x6ADD6AB0, 0x4D1F4DF6, 0xCE4ECEE9, 0xDE2DDE7C, 0x55F9559D, 0x7E487E5A,
+        0x214F21B2, 0x03F2037A, 0xA065A026, 0x5E8E5E19, 0x5A785A66, 0x655C654B, 0x6258624E, 0xFD19FD45,
+        0x068D06F4, 0x40E54086, 0xF298F2BE, 0x335733AC, 0x17671790, 0x057F058E, 0xE805E85E, 0x4F644F7D,
+        0x89AF896A, 0x10631095, 0x74B6742F, 0x0AFE0A75, 0x5CF55C92, 0x9BB79B74, 0x2D3C2D33, 0x30A530D6,
+        0x2ECE2E49, 0x49E94989, 0x46684672, 0x77447755, 0xA8E0A8D8, 0x964D9604, 0x284328BD, 0xA969A929,
+        0xD929D979, 0x862E8691, 0xD1ACD187, 0xF415F44A, 0x8D598D15, 0xD6A8D682, 0xB90AB9BC, 0x429E420D,
+        0xF66EF6C1, 0x2F472FB8, 0xDDDFDD06, 0x23342339, 0xCC35CC62, 0xF16AF1C4, 0xC1CFC112, 0x85DC85EB,
+        0x8F228F9E, 0x71C971A1, 0x90C090F0, 0xAA9BAA53, 0x018901F1, 0x8BD48BE1, 0x4EED4E8C, 0x8EAB8E6F,
+        0xAB12ABA2, 0x6FA26F3E, 0xE60DE654, 0xDB52DBF2, 0x92BB927B, 0xB702B7B6, 0x692F69CA, 0x39A939D9,
+        0xD3D7D30C, 0xA761A723, 0xA21EA2AD, 0xC3B4C399, 0x6C506C44, 0x07040705, 0x04F6047F, 0x27C22746,
+        0xAC16ACA7, 0xD025D076, 0x50865013, 0xDC56DCF7, 0x8455841A, 0xE109E151, 0x7ABE7A25, 0x139113EF
+    );
+
+    /**
+     * M-Table
+     *
+     * @var array
+     * @access private
+     */
+    var $m3 = array(
+        0xD939A9D9, 0x90176790, 0x719CB371, 0xD2A6E8D2, 0x05070405, 0x9852FD98, 0x6580A365, 0xDFE476DF,
+        0x08459A08, 0x024B9202, 0xA0E080A0, 0x665A7866, 0xDDAFE4DD, 0xB06ADDB0, 0xBF63D1BF, 0x362A3836,
+        0x54E60D54, 0x4320C643, 0x62CC3562, 0xBEF298BE, 0x1E12181E, 0x24EBF724, 0xD7A1ECD7, 0x77416C77,
+        0xBD2843BD, 0x32BC7532, 0xD47B37D4, 0x9B88269B, 0x700DFA70, 0xF94413F9, 0xB1FB94B1, 0x5A7E485A,
+        0x7A03F27A, 0xE48CD0E4, 0x47B68B47, 0x3C24303C, 0xA5E784A5, 0x416B5441, 0x06DDDF06, 0xC56023C5,
+        0x45FD1945, 0xA33A5BA3, 0x68C23D68, 0x158D5915, 0x21ECF321, 0x3166AE31, 0x3E6FA23E, 0x16578216,
+        0x95106395, 0x5BEF015B, 0x4DB8834D, 0x91862E91, 0xB56DD9B5, 0x1F83511F, 0x53AA9B53, 0x635D7C63,
+        0x3B68A63B, 0x3FFEEB3F, 0xD630A5D6, 0x257ABE25, 0xA7AC16A7, 0x0F090C0F, 0x35F0E335, 0x23A76123,
+        0xF090C0F0, 0xAFE98CAF, 0x809D3A80, 0x925CF592, 0x810C7381, 0x27312C27, 0x76D02576, 0xE7560BE7,
+        0x7B92BB7B, 0xE9CE4EE9, 0xF10189F1, 0x9F1E6B9F, 0xA93453A9, 0xC4F16AC4, 0x99C3B499, 0x975BF197,
+        0x8347E183, 0x6B18E66B, 0xC822BDC8, 0x0E98450E, 0x6E1FE26E, 0xC9B3F4C9, 0x2F74B62F, 0xCBF866CB,
+        0xFF99CCFF, 0xEA1495EA, 0xED5803ED, 0xF7DC56F7, 0xE18BD4E1, 0x1B151C1B, 0xADA21EAD, 0x0CD3D70C,
+        0x2BE2FB2B, 0x1DC8C31D, 0x195E8E19, 0xC22CB5C2, 0x8949E989, 0x12C1CF12, 0x7E95BF7E, 0x207DBA20,
+        0x6411EA64, 0x840B7784, 0x6DC5396D, 0x6A89AF6A, 0xD17C33D1, 0xA171C9A1, 0xCEFF62CE, 0x37BB7137,
+        0xFB0F81FB, 0x3DB5793D, 0x51E10951, 0xDC3EADDC, 0x2D3F242D, 0xA476CDA4, 0x9D55F99D, 0xEE82D8EE,
+        0x8640E586, 0xAE78C5AE, 0xCD25B9CD, 0x04964D04, 0x55774455, 0x0A0E080A, 0x13508613, 0x30F7E730,
+        0xD337A1D3, 0x40FA1D40, 0x3461AA34, 0x8C4EED8C, 0xB3B006B3, 0x6C54706C, 0x2A73B22A, 0x523BD252,
+        0x0B9F410B, 0x8B027B8B, 0x88D8A088, 0x4FF3114F, 0x67CB3167, 0x4627C246, 0xC06727C0, 0xB4FC90B4,
+        0x28382028, 0x7F04F67F, 0x78486078, 0x2EE5FF2E, 0x074C9607, 0x4B655C4B, 0xC72BB1C7, 0x6F8EAB6F,
+        0x0D429E0D, 0xBBF59CBB, 0xF2DB52F2, 0xF34A1BF3, 0xA63D5FA6, 0x59A49359, 0xBCB90ABC, 0x3AF9EF3A,
+        0xEF1391EF, 0xFE0885FE, 0x01914901, 0x6116EE61, 0x7CDE2D7C, 0xB2214FB2, 0x42B18F42, 0xDB723BDB,
+        0xB82F47B8, 0x48BF8748, 0x2CAE6D2C, 0xE3C046E3, 0x573CD657, 0x859A3E85, 0x29A96929, 0x7D4F647D,
+        0x94812A94, 0x492ECE49, 0x17C6CB17, 0xCA692FCA, 0xC3BDFCC3, 0x5CA3975C, 0x5EE8055E, 0xD0ED7AD0,
+        0x87D1AC87, 0x8E057F8E, 0xBA64D5BA, 0xA8A51AA8, 0xB7264BB7, 0xB9BE0EB9, 0x6087A760, 0xF8D55AF8,
+        0x22362822, 0x111B1411, 0xDE753FDE, 0x79D92979, 0xAAEE88AA, 0x332D3C33, 0x5F794C5F, 0xB6B702B6,
+        0x96CAB896, 0x5835DA58, 0x9CC4B09C, 0xFC4317FC, 0x1A84551A, 0xF64D1FF6, 0x1C598A1C, 0x38B27D38,
+        0xAC3357AC, 0x18CFC718, 0xF4068DF4, 0x69537469, 0x749BB774, 0xF597C4F5, 0x56AD9F56, 0xDAE372DA,
+        0xD5EA7ED5, 0x4AF4154A, 0x9E8F229E, 0xA2AB12A2, 0x4E62584E, 0xE85F07E8, 0xE51D99E5, 0x39233439,
+        0xC1F66EC1, 0x446C5044, 0x5D32DE5D, 0x72466872, 0x26A06526, 0x93CDBC93, 0x03DADB03, 0xC6BAF8C6,
+        0xFA9EC8FA, 0x82D6A882, 0xCF6E2BCF, 0x50704050, 0xEB85DCEB, 0x750AFE75, 0x8A93328A, 0x8DDFA48D,
+        0x4C29CA4C, 0x141C1014, 0x73D72173, 0xCCB4F0CC, 0x09D4D309, 0x108A5D10, 0xE2510FE2, 0x00000000,
+        0x9A196F9A, 0xE01A9DE0, 0x8F94368F, 0xE6C742E6, 0xECC94AEC, 0xFDD25EFD, 0xAB7FC1AB, 0xD8A8E0D8
+    );
+
+    /**
+     * The Key Schedule Array
+     *
+     * @var array
+     * @access private
+     */
+    var $K = array();
+
+    /**
+     * The Key depended S-Table 0
+     *
+     * @var array
+     * @access private
+     */
+    var $S0 = array();
+
+    /**
+     * The Key depended S-Table 1
+     *
+     * @var array
+     * @access private
+     */
+    var $S1 = array();
+
+    /**
+     * The Key depended S-Table 2
+     *
+     * @var array
+     * @access private
+     */
+    var $S2 = array();
+
+    /**
+     * The Key depended S-Table 3
+     *
+     * @var array
+     * @access private
+     */
+    var $S3 = array();
+
+    /**
+     * Holds the last used key
+     *
+     * @var array
+     * @access private
+     */
+    var $kl;
+
+    /**
+     * The Key Length (in bytes)
+     *
+     * @see Crypt_Twofish::setKeyLength()
+     * @var int
+     * @access private
+     */
+    var $key_length = 16;
+
+    /**
+     * Sets the key length.
+     *
+     * Valid key lengths are 128, 192 or 256 bits
+     *
+     * @access public
+     * @param int $length
+     */
+    function setKeyLength($length)
+    {
+        switch (true) {
+            case $length <= 128:
+                $this->key_length = 16;
+                break;
+            case $length <= 192:
+                $this->key_length = 24;
+                break;
+            default:
+                $this->key_length = 32;
+        }
+
+        parent::setKeyLength($length);
+    }
+
+    /**
+     * Setup the key (expansion)
+     *
+     * @see Crypt_Base::_setupKey()
+     * @access private
+     */
+    function _setupKey()
+    {
+        if (isset($this->kl['key']) && $this->key === $this->kl['key']) {
+            // already expanded
+            return;
+        }
+        $this->kl = array('key' => $this->key);
+
+        /* Key expanding and generating the key-depended s-boxes */
+        $le_longs = unpack('V*', $this->key);
+        $key = unpack('C*', $this->key);
+        $m0 = $this->m0;
+        $m1 = $this->m1;
+        $m2 = $this->m2;
+        $m3 = $this->m3;
+        $q0 = $this->q0;
+        $q1 = $this->q1;
+
+        $K = $S0 = $S1 = $S2 = $S3 = array();
+
+        switch (strlen($this->key)) {
+            case 16:
+                list($s7, $s6, $s5, $s4) = $this->_mdsrem($le_longs[1], $le_longs[2]);
+                list($s3, $s2, $s1, $s0) = $this->_mdsrem($le_longs[3], $le_longs[4]);
+                for ($i = 0, $j = 1; $i < 40; $i+= 2, $j+= 2) {
+                    $A = $m0[$q0[$q0[$i] ^ $key[ 9]] ^ $key[1]] ^
+                         $m1[$q0[$q1[$i] ^ $key[10]] ^ $key[2]] ^
+                         $m2[$q1[$q0[$i] ^ $key[11]] ^ $key[3]] ^
+                         $m3[$q1[$q1[$i] ^ $key[12]] ^ $key[4]];
+                    $B = $m0[$q0[$q0[$j] ^ $key[13]] ^ $key[5]] ^
+                         $m1[$q0[$q1[$j] ^ $key[14]] ^ $key[6]] ^
+                         $m2[$q1[$q0[$j] ^ $key[15]] ^ $key[7]] ^
+                         $m3[$q1[$q1[$j] ^ $key[16]] ^ $key[8]];
+                    $B = ($B << 8) | ($B >> 24 & 0xff);
+                    $A = $this->safe_intval($A + $B);
+                    $K[] = $A;
+                    $A = $this->safe_intval($A + $B);
+                    $K[] = ($A << 9 | $A >> 23 & 0x1ff);
+                }
+                for ($i = 0; $i < 256; ++$i) {
+                    $S0[$i] = $m0[$q0[$q0[$i] ^ $s4] ^ $s0];
+                    $S1[$i] = $m1[$q0[$q1[$i] ^ $s5] ^ $s1];
+                    $S2[$i] = $m2[$q1[$q0[$i] ^ $s6] ^ $s2];
+                    $S3[$i] = $m3[$q1[$q1[$i] ^ $s7] ^ $s3];
+                }
+                break;
+            case 24:
+                list($sb, $sa, $s9, $s8) = $this->_mdsrem($le_longs[1], $le_longs[2]);
+                list($s7, $s6, $s5, $s4) = $this->_mdsrem($le_longs[3], $le_longs[4]);
+                list($s3, $s2, $s1, $s0) = $this->_mdsrem($le_longs[5], $le_longs[6]);
+                for ($i = 0, $j = 1; $i < 40; $i+= 2, $j+= 2) {
+                    $A = $m0[$q0[$q0[$q1[$i] ^ $key[17]] ^ $key[ 9]] ^ $key[1]] ^
+                         $m1[$q0[$q1[$q1[$i] ^ $key[18]] ^ $key[10]] ^ $key[2]] ^
+                         $m2[$q1[$q0[$q0[$i] ^ $key[19]] ^ $key[11]] ^ $key[3]] ^
+                         $m3[$q1[$q1[$q0[$i] ^ $key[20]] ^ $key[12]] ^ $key[4]];
+                    $B = $m0[$q0[$q0[$q1[$j] ^ $key[21]] ^ $key[13]] ^ $key[5]] ^
+                         $m1[$q0[$q1[$q1[$j] ^ $key[22]] ^ $key[14]] ^ $key[6]] ^
+                         $m2[$q1[$q0[$q0[$j] ^ $key[23]] ^ $key[15]] ^ $key[7]] ^
+                         $m3[$q1[$q1[$q0[$j] ^ $key[24]] ^ $key[16]] ^ $key[8]];
+                    $B = ($B << 8) | ($B >> 24 & 0xff);
+                    $A = $this->safe_intval($A + $B);
+                    $K[] = $A;
+                    $A = $this->safe_intval($A + $B);
+                    $K[] = ($A << 9 | $A >> 23 & 0x1ff);
+                }
+                for ($i = 0; $i < 256; ++$i) {
+                    $S0[$i] = $m0[$q0[$q0[$q1[$i] ^ $s8] ^ $s4] ^ $s0];
+                    $S1[$i] = $m1[$q0[$q1[$q1[$i] ^ $s9] ^ $s5] ^ $s1];
+                    $S2[$i] = $m2[$q1[$q0[$q0[$i] ^ $sa] ^ $s6] ^ $s2];
+                    $S3[$i] = $m3[$q1[$q1[$q0[$i] ^ $sb] ^ $s7] ^ $s3];
+                }
+                break;
+            default: // 32
+                list($sf, $se, $sd, $sc) = $this->_mdsrem($le_longs[1], $le_longs[2]);
+                list($sb, $sa, $s9, $s8) = $this->_mdsrem($le_longs[3], $le_longs[4]);
+                list($s7, $s6, $s5, $s4) = $this->_mdsrem($le_longs[5], $le_longs[6]);
+                list($s3, $s2, $s1, $s0) = $this->_mdsrem($le_longs[7], $le_longs[8]);
+                for ($i = 0, $j = 1; $i < 40; $i+= 2, $j+= 2) {
+                    $A = $m0[$q0[$q0[$q1[$q1[$i] ^ $key[25]] ^ $key[17]] ^ $key[ 9]] ^ $key[1]] ^
+                         $m1[$q0[$q1[$q1[$q0[$i] ^ $key[26]] ^ $key[18]] ^ $key[10]] ^ $key[2]] ^
+                         $m2[$q1[$q0[$q0[$q0[$i] ^ $key[27]] ^ $key[19]] ^ $key[11]] ^ $key[3]] ^
+                         $m3[$q1[$q1[$q0[$q1[$i] ^ $key[28]] ^ $key[20]] ^ $key[12]] ^ $key[4]];
+                    $B = $m0[$q0[$q0[$q1[$q1[$j] ^ $key[29]] ^ $key[21]] ^ $key[13]] ^ $key[5]] ^
+                         $m1[$q0[$q1[$q1[$q0[$j] ^ $key[30]] ^ $key[22]] ^ $key[14]] ^ $key[6]] ^
+                         $m2[$q1[$q0[$q0[$q0[$j] ^ $key[31]] ^ $key[23]] ^ $key[15]] ^ $key[7]] ^
+                         $m3[$q1[$q1[$q0[$q1[$j] ^ $key[32]] ^ $key[24]] ^ $key[16]] ^ $key[8]];
+                    $B = ($B << 8) | ($B >> 24 & 0xff);
+                    $A = $this->safe_intval($A + $B);
+                    $K[] = $A;
+                    $A = $this->safe_intval($A + $B);
+                    $K[] = ($A << 9 | $A >> 23 & 0x1ff);
+                }
+                for ($i = 0; $i < 256; ++$i) {
+                    $S0[$i] = $m0[$q0[$q0[$q1[$q1[$i] ^ $sc] ^ $s8] ^ $s4] ^ $s0];
+                    $S1[$i] = $m1[$q0[$q1[$q1[$q0[$i] ^ $sd] ^ $s9] ^ $s5] ^ $s1];
+                    $S2[$i] = $m2[$q1[$q0[$q0[$q0[$i] ^ $se] ^ $sa] ^ $s6] ^ $s2];
+                    $S3[$i] = $m3[$q1[$q1[$q0[$q1[$i] ^ $sf] ^ $sb] ^ $s7] ^ $s3];
+                }
+        }
+
+        $this->K  = $K;
+        $this->S0 = $S0;
+        $this->S1 = $S1;
+        $this->S2 = $S2;
+        $this->S3 = $S3;
+    }
+
+    /**
+     * _mdsrem function using by the twofish cipher algorithm
+     *
+     * @access private
+     * @param string $A
+     * @param string $B
+     * @return array
+     */
+    function _mdsrem($A, $B)
+    {
+        // No gain by unrolling this loop.
+        for ($i = 0; $i < 8; ++$i) {
+            // Get most significant coefficient.
+            $t = 0xff & ($B >> 24);
+
+            // Shift the others up.
+            $B = ($B << 8) | (0xff & ($A >> 24));
+            $A<<= 8;
+
+            $u = $t << 1;
+
+            // Subtract the modular polynomial on overflow.
+            if ($t & 0x80) {
+                $u^= 0x14d;
+            }
+
+            // Remove t * (a * x^2 + 1).
+            $B ^= $t ^ ($u << 16);
+
+            // Form u = a*t + t/a = t*(a + 1/a).
+            $u^= 0x7fffffff & ($t >> 1);
+
+            // Add the modular polynomial on underflow.
+            if ($t & 0x01) {
+                $u^= 0xa6 ;
+            }
+
+            // Remove t * (a + 1/a) * (x^3 + x).
+            $B^= ($u << 24) | ($u << 8);
+        }
+
+        return array(
+            0xff & $B >> 24,
+            0xff & $B >> 16,
+            0xff & $B >>  8,
+            0xff & $B);
+    }
+
+    /**
+     * Encrypts a block
+     *
+     * @access private
+     * @param string $in
+     * @return string
+     */
+    function _encryptBlock($in)
+    {
+        $S0 = $this->S0;
+        $S1 = $this->S1;
+        $S2 = $this->S2;
+        $S3 = $this->S3;
+        $K  = $this->K;
+
+        $in = unpack("V4", $in);
+        $R0 = $K[0] ^ $in[1];
+        $R1 = $K[1] ^ $in[2];
+        $R2 = $K[2] ^ $in[3];
+        $R3 = $K[3] ^ $in[4];
+
+        $ki = 7;
+        while ($ki < 39) {
+            $t0 = $S0[ $R0        & 0xff] ^
+                  $S1[($R0 >>  8) & 0xff] ^
+                  $S2[($R0 >> 16) & 0xff] ^
+                  $S3[($R0 >> 24) & 0xff];
+            $t1 = $S0[($R1 >> 24) & 0xff] ^
+                  $S1[ $R1        & 0xff] ^
+                  $S2[($R1 >>  8) & 0xff] ^
+                  $S3[($R1 >> 16) & 0xff];
+            $R2^= $this->safe_intval($t0 + $t1 + $K[++$ki]);
+            $R2 = ($R2 >> 1 & 0x7fffffff) | ($R2 << 31);
+            $R3 = ((($R3 >> 31) & 1) | ($R3 << 1)) ^ $this->safe_intval($t0 + ($t1 << 1) + $K[++$ki]);
+
+            $t0 = $S0[ $R2        & 0xff] ^
+                  $S1[($R2 >>  8) & 0xff] ^
+                  $S2[($R2 >> 16) & 0xff] ^
+                  $S3[($R2 >> 24) & 0xff];
+            $t1 = $S0[($R3 >> 24) & 0xff] ^
+                  $S1[ $R3        & 0xff] ^
+                  $S2[($R3 >>  8) & 0xff] ^
+                  $S3[($R3 >> 16) & 0xff];
+            $R0^= $this->safe_intval($t0 + $t1 + $K[++$ki]);
+            $R0 = ($R0 >> 1 & 0x7fffffff) | ($R0 << 31);
+            $R1 = ((($R1 >> 31) & 1) | ($R1 << 1)) ^ $this->safe_intval($t0 + ($t1 << 1) + $K[++$ki]);
+        }
+
+        // @codingStandardsIgnoreStart
+        return pack("V4", $K[4] ^ $R2,
+                          $K[5] ^ $R3,
+                          $K[6] ^ $R0,
+                          $K[7] ^ $R1);
+        // @codingStandardsIgnoreEnd
+    }
+
+    /**
+     * Decrypts a block
+     *
+     * @access private
+     * @param string $in
+     * @return string
+     */
+    function _decryptBlock($in)
+    {
+        $S0 = $this->S0;
+        $S1 = $this->S1;
+        $S2 = $this->S2;
+        $S3 = $this->S3;
+        $K  = $this->K;
+
+        $in = unpack("V4", $in);
+        $R0 = $K[4] ^ $in[1];
+        $R1 = $K[5] ^ $in[2];
+        $R2 = $K[6] ^ $in[3];
+        $R3 = $K[7] ^ $in[4];
+
+        $ki = 40;
+        while ($ki > 8) {
+            $t0 = $S0[$R0       & 0xff] ^
+                  $S1[$R0 >>  8 & 0xff] ^
+                  $S2[$R0 >> 16 & 0xff] ^
+                  $S3[$R0 >> 24 & 0xff];
+            $t1 = $S0[$R1 >> 24 & 0xff] ^
+                  $S1[$R1       & 0xff] ^
+                  $S2[$R1 >>  8 & 0xff] ^
+                  $S3[$R1 >> 16 & 0xff];
+            $R3^= $this->safe_intval($t0 + ($t1 << 1) + $K[--$ki]);
+            $R3 = $R3 >> 1 & 0x7fffffff | $R3 << 31;
+            $R2 = ($R2 >> 31 & 0x1 | $R2 << 1) ^ $this->safe_intval($t0 + $t1 + $K[--$ki]);
+
+            $t0 = $S0[$R2       & 0xff] ^
+                  $S1[$R2 >>  8 & 0xff] ^
+                  $S2[$R2 >> 16 & 0xff] ^
+                  $S3[$R2 >> 24 & 0xff];
+            $t1 = $S0[$R3 >> 24 & 0xff] ^
+                  $S1[$R3       & 0xff] ^
+                  $S2[$R3 >>  8 & 0xff] ^
+                  $S3[$R3 >> 16 & 0xff];
+            $R1^= $this->safe_intval($t0 + ($t1 << 1) + $K[--$ki]);
+            $R1 = $R1 >> 1 & 0x7fffffff | $R1 << 31;
+            $R0 = ($R0 >> 31 & 0x1 | $R0 << 1) ^ $this->safe_intval($t0 + $t1 + $K[--$ki]);
+        }
+
+        // @codingStandardsIgnoreStart
+        return pack("V4", $K[0] ^ $R2,
+                          $K[1] ^ $R3,
+                          $K[2] ^ $R0,
+                          $K[3] ^ $R1);
+        // @codingStandardsIgnoreEnd
+    }
+
+    /**
+     * Setup the performance-optimized function for de/encrypt()
+     *
+     * @see Crypt_Base::_setupInlineCrypt()
+     * @access private
+     */
+    function _setupInlineCrypt()
+    {
+        $lambda_functions =& Crypt_Twofish::_getLambdaFunctions();
+
+        // Max. 10 Ultra-Hi-optimized inline-crypt functions. After that, we'll (still) create very fast code, but not the ultimate fast one.
+        // (Currently, for Crypt_Twofish, one generated $lambda_function cost on php5.5@32bit ~140kb unfreeable mem and ~240kb on php5.5@64bit)
+        $gen_hi_opt_code = (bool)(count($lambda_functions) < 10);
+
+        // Generation of a unique hash for our generated code
+        $code_hash = "Crypt_Twofish, {$this->mode}";
+        if ($gen_hi_opt_code) {
+            $code_hash = str_pad($code_hash, 32) . $this->_hashInlineCryptFunction($this->key);
+        }
+
+        $safeint = $this->safe_intval_inline();
+
+        if (!isset($lambda_functions[$code_hash])) {
+            switch (true) {
+                case $gen_hi_opt_code:
+                    $K = $this->K;
+                    $init_crypt = '
+                        static $S0, $S1, $S2, $S3;
+                        if (!$S0) {
+                            for ($i = 0; $i < 256; ++$i) {
+                                $S0[] = (int)$self->S0[$i];
+                                $S1[] = (int)$self->S1[$i];
+                                $S2[] = (int)$self->S2[$i];
+                                $S3[] = (int)$self->S3[$i];
+                            }
+                        }
+                    ';
+                    break;
+                default:
+                    $K   = array();
+                    for ($i = 0; $i < 40; ++$i) {
+                        $K[] = '$K_' . $i;
+                    }
+                    $init_crypt = '
+                        $S0 = $self->S0;
+                        $S1 = $self->S1;
+                        $S2 = $self->S2;
+                        $S3 = $self->S3;
+                        list(' . implode(',', $K) . ') = $self->K;
+                    ';
+            }
+
+            // Generating encrypt code:
+            $encrypt_block = '
+                $in = unpack("V4", $in);
+                $R0 = '.$K[0].' ^ $in[1];
+                $R1 = '.$K[1].' ^ $in[2];
+                $R2 = '.$K[2].' ^ $in[3];
+                $R3 = '.$K[3].' ^ $in[4];
+            ';
+            for ($ki = 7, $i = 0; $i < 8; ++$i) {
+                $encrypt_block.= '
+                    $t0 = $S0[ $R0        & 0xff] ^
+                          $S1[($R0 >>  8) & 0xff] ^
+                          $S2[($R0 >> 16) & 0xff] ^
+                          $S3[($R0 >> 24) & 0xff];
+                    $t1 = $S0[($R1 >> 24) & 0xff] ^
+                          $S1[ $R1        & 0xff] ^
+                          $S2[($R1 >>  8) & 0xff] ^
+                          $S3[($R1 >> 16) & 0xff];
+                    $R2^= ' . sprintf($safeint, '$t0 + $t1 + ' . $K[++$ki]) . ';
+                    $R2 = ($R2 >> 1 & 0x7fffffff) | ($R2 << 31);
+                    $R3 = ((($R3 >> 31) & 1) | ($R3 << 1)) ^ ' . sprintf($safeint, '($t0 + ($t1 << 1) + ' . $K[++$ki] . ')') . ';
+
+                    $t0 = $S0[ $R2        & 0xff] ^
+                          $S1[($R2 >>  8) & 0xff] ^
+                          $S2[($R2 >> 16) & 0xff] ^
+                          $S3[($R2 >> 24) & 0xff];
+                    $t1 = $S0[($R3 >> 24) & 0xff] ^
+                          $S1[ $R3        & 0xff] ^
+                          $S2[($R3 >>  8) & 0xff] ^
+                          $S3[($R3 >> 16) & 0xff];
+                    $R0^= ' . sprintf($safeint, '($t0 + $t1 + ' . $K[++$ki] . ')') . ';
+                    $R0 = ($R0 >> 1 & 0x7fffffff) | ($R0 << 31);
+                    $R1 = ((($R1 >> 31) & 1) | ($R1 << 1)) ^ ' . sprintf($safeint, '($t0 + ($t1 << 1) + ' . $K[++$ki] . ')') . ';
+                ';
+            }
+            $encrypt_block.= '
+                $in = pack("V4", ' . $K[4] . ' ^ $R2,
+                                 ' . $K[5] . ' ^ $R3,
+                                 ' . $K[6] . ' ^ $R0,
+                                 ' . $K[7] . ' ^ $R1);
+            ';
+
+            // Generating decrypt code:
+            $decrypt_block = '
+                $in = unpack("V4", $in);
+                $R0 = '.$K[4].' ^ $in[1];
+                $R1 = '.$K[5].' ^ $in[2];
+                $R2 = '.$K[6].' ^ $in[3];
+                $R3 = '.$K[7].' ^ $in[4];
+            ';
+            for ($ki = 40, $i = 0; $i < 8; ++$i) {
+                $decrypt_block.= '
+                    $t0 = $S0[$R0       & 0xff] ^
+                          $S1[$R0 >>  8 & 0xff] ^
+                          $S2[$R0 >> 16 & 0xff] ^
+                          $S3[$R0 >> 24 & 0xff];
+                    $t1 = $S0[$R1 >> 24 & 0xff] ^
+                          $S1[$R1       & 0xff] ^
+                          $S2[$R1 >>  8 & 0xff] ^
+                          $S3[$R1 >> 16 & 0xff];
+                    $R3^= ' . sprintf($safeint, '$t0 + ($t1 << 1) + ' . $K[--$ki]) . ';
+                    $R3 = $R3 >> 1 & 0x7fffffff | $R3 << 31;
+                    $R2 = ($R2 >> 31 & 0x1 | $R2 << 1) ^ ' . sprintf($safeint, '($t0 + $t1 + '.$K[--$ki] . ')') . ';
+
+                    $t0 = $S0[$R2       & 0xff] ^
+                          $S1[$R2 >>  8 & 0xff] ^
+                          $S2[$R2 >> 16 & 0xff] ^
+                          $S3[$R2 >> 24 & 0xff];
+                    $t1 = $S0[$R3 >> 24 & 0xff] ^
+                          $S1[$R3       & 0xff] ^
+                          $S2[$R3 >>  8 & 0xff] ^
+                          $S3[$R3 >> 16 & 0xff];
+                    $R1^= ' . sprintf($safeint, '$t0 + ($t1 << 1) + ' . $K[--$ki]) . ';
+                    $R1 = $R1 >> 1 & 0x7fffffff | $R1 << 31;
+                    $R0 = ($R0 >> 31 & 0x1 | $R0 << 1) ^ ' . sprintf($safeint, '($t0 + $t1 + '.$K[--$ki] . ')') . ';
+                ';
+            }
+            $decrypt_block.= '
+                $in = pack("V4", ' . $K[0] . ' ^ $R2,
+                                 ' . $K[1] . ' ^ $R3,
+                                 ' . $K[2] . ' ^ $R0,
+                                 ' . $K[3] . ' ^ $R1);
+            ';
+
+            $lambda_functions[$code_hash] = $this->_createInlineCryptFunction(
+                array(
+                   'init_crypt'    => $init_crypt,
+                   'init_encrypt'  => '',
+                   'init_decrypt'  => '',
+                   'encrypt_block' => $encrypt_block,
+                   'decrypt_block' => $decrypt_block
+                )
+            );
+        }
+        $this->inline_crypt = $lambda_functions[$code_hash];
+    }
+}
diff --git a/lib/php/phpseclib/File/ANSI.php b/lib/php/phpseclib/File/ANSI.php
new file mode 100644
index 00000000..7411adf6
--- /dev/null
+++ b/lib/php/phpseclib/File/ANSI.php
@@ -0,0 +1,604 @@
+<?php
+
+/**
+ * Pure-PHP ANSI Decoder
+ *
+ * PHP versions 4 and 5
+ *
+ * If you call read() in Net_SSH2 you may get {@link http://en.wikipedia.org/wiki/ANSI_escape_code ANSI escape codes} back.
+ * They'd look like chr(0x1B) . '[00m' or whatever (0x1B = ESC).  They tell a
+ * {@link http://en.wikipedia.org/wiki/Terminal_emulator terminal emulator} how to format the characters, what
+ * color to display them in, etc. File_ANSI is a {@link http://en.wikipedia.org/wiki/VT100 VT100} terminal emulator.
+ *
+ * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @category  File
+ * @package   File_ANSI
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2012 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+/**
+ * Pure-PHP ANSI Decoder
+ *
+ * @package File_ANSI
+ * @author  Jim Wigginton <terrafrost@php.net>
+ * @access  public
+ */
+class File_ANSI
+{
+    /**
+     * Max Width
+     *
+     * @var int
+     * @access private
+     */
+    var $max_x;
+
+    /**
+     * Max Height
+     *
+     * @var int
+     * @access private
+     */
+    var $max_y;
+
+    /**
+     * Max History
+     *
+     * @var int
+     * @access private
+     */
+    var $max_history;
+
+    /**
+     * History
+     *
+     * @var array
+     * @access private
+     */
+    var $history;
+
+    /**
+     * History Attributes
+     *
+     * @var array
+     * @access private
+     */
+    var $history_attrs;
+
+    /**
+     * Current Column
+     *
+     * @var int
+     * @access private
+     */
+    var $x;
+
+    /**
+     * Current Row
+     *
+     * @var int
+     * @access private
+     */
+    var $y;
+
+    /**
+     * Old Column
+     *
+     * @var int
+     * @access private
+     */
+    var $old_x;
+
+    /**
+     * Old Row
+     *
+     * @var int
+     * @access private
+     */
+    var $old_y;
+
+    /**
+     * An empty attribute cell
+     *
+     * @var object
+     * @access private
+     */
+    var $base_attr_cell;
+
+    /**
+     * The current attribute cell
+     *
+     * @var object
+     * @access private
+     */
+    var $attr_cell;
+
+    /**
+     * An empty attribute row
+     *
+     * @var array
+     * @access private
+     */
+    var $attr_row;
+
+    /**
+     * The current screen text
+     *
+     * @var array
+     * @access private
+     */
+    var $screen;
+
+    /**
+     * The current screen attributes
+     *
+     * @var array
+     * @access private
+     */
+    var $attrs;
+
+    /**
+     * Current ANSI code
+     *
+     * @var string
+     * @access private
+     */
+    var $ansi;
+
+    /**
+     * Tokenization
+     *
+     * @var array
+     * @access private
+     */
+    var $tokenization;
+
+    /**
+     * Default Constructor.
+     *
+     * @return File_ANSI
+     * @access public
+     */
+    function __construct()
+    {
+        $attr_cell = new stdClass();
+        $attr_cell->bold = false;
+        $attr_cell->underline = false;
+        $attr_cell->blink = false;
+        $attr_cell->background = 'black';
+        $attr_cell->foreground = 'white';
+        $attr_cell->reverse = false;
+        $this->base_attr_cell = clone($attr_cell);
+        $this->attr_cell = clone($attr_cell);
+
+        $this->setHistory(200);
+        $this->setDimensions(80, 24);
+    }
+
+    /**
+     * PHP4 compatible Default Constructor.
+     *
+     * @see self::__construct()
+     * @access public
+     */
+    function File_ANSI()
+    {
+        $this->__construct($mode);
+    }
+
+    /**
+     * Set terminal width and height
+     *
+     * Resets the screen as well
+     *
+     * @param int $x
+     * @param int $y
+     * @access public
+     */
+    function setDimensions($x, $y)
+    {
+        $this->max_x = $x - 1;
+        $this->max_y = $y - 1;
+        $this->x = $this->y = 0;
+        $this->history = $this->history_attrs = array();
+        $this->attr_row = array_fill(0, $this->max_x + 2, $this->base_attr_cell);
+        $this->screen = array_fill(0, $this->max_y + 1, '');
+        $this->attrs = array_fill(0, $this->max_y + 1, $this->attr_row);
+        $this->ansi = '';
+    }
+
+    /**
+     * Set the number of lines that should be logged past the terminal height
+     *
+     * @param int $x
+     * @param int $y
+     * @access public
+     */
+    function setHistory($history)
+    {
+        $this->max_history = $history;
+    }
+
+    /**
+     * Load a string
+     *
+     * @param string $source
+     * @access public
+     */
+    function loadString($source)
+    {
+        $this->setDimensions($this->max_x + 1, $this->max_y + 1);
+        $this->appendString($source);
+    }
+
+    /**
+     * Appdend a string
+     *
+     * @param string $source
+     * @access public
+     */
+    function appendString($source)
+    {
+        $this->tokenization = array('');
+        for ($i = 0; $i < strlen($source); $i++) {
+            if (strlen($this->ansi)) {
+                $this->ansi.= $source[$i];
+                $chr = ord($source[$i]);
+                // http://en.wikipedia.org/wiki/ANSI_escape_code#Sequence_elements
+                // single character CSI's not currently supported
+                switch (true) {
+                    case $this->ansi == "\x1B=":
+                        $this->ansi = '';
+                        continue 2;
+                    case strlen($this->ansi) == 2 && $chr >= 64 && $chr <= 95 && $chr != ord('['):
+                    case strlen($this->ansi) > 2 && $chr >= 64 && $chr <= 126:
+                        break;
+                    default:
+                        continue 2;
+                }
+                $this->tokenization[] = $this->ansi;
+                $this->tokenization[] = '';
+                // http://ascii-table.com/ansi-escape-sequences-vt-100.php
+                switch ($this->ansi) {
+                    case "\x1B[H": // Move cursor to upper left corner
+                        $this->old_x = $this->x;
+                        $this->old_y = $this->y;
+                        $this->x = $this->y = 0;
+                        break;
+                    case "\x1B[J": // Clear screen from cursor down
+                        $this->history = array_merge($this->history, array_slice(array_splice($this->screen, $this->y + 1), 0, $this->old_y));
+                        $this->screen = array_merge($this->screen, array_fill($this->y, $this->max_y, ''));
+
+                        $this->history_attrs = array_merge($this->history_attrs, array_slice(array_splice($this->attrs, $this->y + 1), 0, $this->old_y));
+                        $this->attrs = array_merge($this->attrs, array_fill($this->y, $this->max_y, $this->attr_row));
+
+                        if (count($this->history) == $this->max_history) {
+                            array_shift($this->history);
+                            array_shift($this->history_attrs);
+                        }
+                    case "\x1B[K": // Clear screen from cursor right
+                        $this->screen[$this->y] = substr($this->screen[$this->y], 0, $this->x);
+
+                        array_splice($this->attrs[$this->y], $this->x + 1, $this->max_x - $this->x, array_fill($this->x, $this->max_x - $this->x - 1, $this->base_attr_cell));
+                        break;
+                    case "\x1B[2K": // Clear entire line
+                        $this->screen[$this->y] = str_repeat(' ', $this->x);
+                        $this->attrs[$this->y] = $this->attr_row;
+                        break;
+                    case "\x1B[?1h": // set cursor key to application
+                    case "\x1B[?25h": // show the cursor
+                    case "\x1B(B": // set united states g0 character set
+                        break;
+                    case "\x1BE": // Move to next line
+                        $this->_newLine();
+                        $this->x = 0;
+                        break;
+                    default:
+                        switch (true) {
+                            case preg_match('#\x1B\[(\d+)B#', $this->ansi, $match): // Move cursor down n lines
+                                $this->old_y = $this->y;
+                                $this->y+= $match[1];
+                                break;
+                            case preg_match('#\x1B\[(\d+);(\d+)H#', $this->ansi, $match): // Move cursor to screen location v,h
+                                $this->old_x = $this->x;
+                                $this->old_y = $this->y;
+                                $this->x = $match[2] - 1;
+                                $this->y = $match[1] - 1;
+                                break;
+                            case preg_match('#\x1B\[(\d+)C#', $this->ansi, $match): // Move cursor right n lines
+                                $this->old_x = $this->x;
+                                $this->x+= $match[1];
+                                break;
+                            case preg_match('#\x1B\[(\d+)D#', $this->ansi, $match): // Move cursor left n lines
+                                $this->old_x = $this->x;
+                                $this->x-= $match[1];
+                                if ($this->x < 0) {
+                                    $this->x = 0;
+                                }
+                                break;
+                            case preg_match('#\x1B\[(\d+);(\d+)r#', $this->ansi, $match): // Set top and bottom lines of a window
+                                break;
+                            case preg_match('#\x1B\[(\d*(?:;\d*)*)m#', $this->ansi, $match): // character attributes
+                                $attr_cell = &$this->attr_cell;
+                                $mods = explode(';', $match[1]);
+                                foreach ($mods as $mod) {
+                                    switch ($mod) {
+                                        case 0: // Turn off character attributes
+                                            $attr_cell = clone($this->base_attr_cell);
+                                            break;
+                                        case 1: // Turn bold mode on
+                                            $attr_cell->bold = true;
+                                            break;
+                                        case 4: // Turn underline mode on
+                                            $attr_cell->underline = true;
+                                            break;
+                                        case 5: // Turn blinking mode on
+                                            $attr_cell->blink = true;
+                                            break;
+                                        case 7: // Turn reverse video on
+                                            $attr_cell->reverse = !$attr_cell->reverse;
+                                            $temp = $attr_cell->background;
+                                            $attr_cell->background = $attr_cell->foreground;
+                                            $attr_cell->foreground = $temp;
+                                            break;
+                                        default: // set colors
+                                            //$front = $attr_cell->reverse ? &$attr_cell->background : &$attr_cell->foreground;
+                                            $front = &$attr_cell->{ $attr_cell->reverse ? 'background' : 'foreground' };
+                                            //$back = $attr_cell->reverse ? &$attr_cell->foreground : &$attr_cell->background;
+                                            $back = &$attr_cell->{ $attr_cell->reverse ? 'foreground' : 'background' };
+                                            switch ($mod) {
+                                                // @codingStandardsIgnoreStart
+                                                case 30: $front = 'black'; break;
+                                                case 31: $front = 'red'; break;
+                                                case 32: $front = 'green'; break;
+                                                case 33: $front = 'yellow'; break;
+                                                case 34: $front = 'blue'; break;
+                                                case 35: $front = 'magenta'; break;
+                                                case 36: $front = 'cyan'; break;
+                                                case 37: $front = 'white'; break;
+
+                                                case 40: $back = 'black'; break;
+                                                case 41: $back = 'red'; break;
+                                                case 42: $back = 'green'; break;
+                                                case 43: $back = 'yellow'; break;
+                                                case 44: $back = 'blue'; break;
+                                                case 45: $back = 'magenta'; break;
+                                                case 46: $back = 'cyan'; break;
+                                                case 47: $back = 'white'; break;
+                                                // @codingStandardsIgnoreEnd
+
+                                                default:
+                                                    //user_error('Unsupported attribute: ' . $mod);
+                                                    $this->ansi = '';
+                                                    break 2;
+                                            }
+                                    }
+                                }
+                                break;
+                            default:
+                                //user_error("{$this->ansi} is unsupported\r\n");
+                        }
+                }
+                $this->ansi = '';
+                continue;
+            }
+
+            $this->tokenization[count($this->tokenization) - 1].= $source[$i];
+            switch ($source[$i]) {
+                case "\r":
+                    $this->x = 0;
+                    break;
+                case "\n":
+                    $this->_newLine();
+                    break;
+                case "\x08": // backspace
+                    if ($this->x) {
+                        $this->x--;
+                        $this->attrs[$this->y][$this->x] = clone($this->base_attr_cell);
+                        $this->screen[$this->y] = substr_replace(
+                            $this->screen[$this->y],
+                            $source[$i],
+                            $this->x,
+                            1
+                        );
+                    }
+                    break;
+                case "\x0F": // shift
+                    break;
+                case "\x1B": // start ANSI escape code
+                    $this->tokenization[count($this->tokenization) - 1] = substr($this->tokenization[count($this->tokenization) - 1], 0, -1);
+                    //if (!strlen($this->tokenization[count($this->tokenization) - 1])) {
+                    //    array_pop($this->tokenization);
+                    //}
+                    $this->ansi.= "\x1B";
+                    break;
+                default:
+                    $this->attrs[$this->y][$this->x] = clone($this->attr_cell);
+                    if ($this->x > strlen($this->screen[$this->y])) {
+                        $this->screen[$this->y] = str_repeat(' ', $this->x);
+                    }
+                    $this->screen[$this->y] = substr_replace(
+                        $this->screen[$this->y],
+                        $source[$i],
+                        $this->x,
+                        1
+                    );
+
+                    if ($this->x > $this->max_x) {
+                        $this->x = 0;
+                        $this->_newLine();
+                    } else {
+                        $this->x++;
+                    }
+            }
+        }
+    }
+
+    /**
+     * Add a new line
+     *
+     * Also update the $this->screen and $this->history buffers
+     *
+     * @access private
+     */
+    function _newLine()
+    {
+        //if ($this->y < $this->max_y) {
+        //    $this->y++;
+        //}
+
+        while ($this->y >= $this->max_y) {
+            $this->history = array_merge($this->history, array(array_shift($this->screen)));
+            $this->screen[] = '';
+
+            $this->history_attrs = array_merge($this->history_attrs, array(array_shift($this->attrs)));
+            $this->attrs[] = $this->attr_row;
+
+            if (count($this->history) >= $this->max_history) {
+                array_shift($this->history);
+                array_shift($this->history_attrs);
+            }
+
+            $this->y--;
+        }
+        $this->y++;
+    }
+
+    /**
+     * Returns the current coordinate without preformating
+     *
+     * @access private
+     * @return string
+     */
+    function _processCoordinate($last_attr, $cur_attr, $char)
+    {
+        $output = '';
+
+        if ($last_attr != $cur_attr) {
+            $close = $open = '';
+            if ($last_attr->foreground != $cur_attr->foreground) {
+                if ($cur_attr->foreground != 'white') {
+                    $open.= '<span style="color: ' . $cur_attr->foreground . '">';
+                }
+                if ($last_attr->foreground != 'white') {
+                    $close = '</span>' . $close;
+                }
+            }
+            if ($last_attr->background != $cur_attr->background) {
+                if ($cur_attr->background != 'black') {
+                    $open.= '<span style="background: ' . $cur_attr->background . '">';
+                }
+                if ($last_attr->background != 'black') {
+                    $close = '</span>' . $close;
+                }
+            }
+            if ($last_attr->bold != $cur_attr->bold) {
+                if ($cur_attr->bold) {
+                    $open.= '<b>';
+                } else {
+                    $close = '</b>' . $close;
+                }
+            }
+            if ($last_attr->underline != $cur_attr->underline) {
+                if ($cur_attr->underline) {
+                    $open.= '<u>';
+                } else {
+                    $close = '</u>' . $close;
+                }
+            }
+            if ($last_attr->blink != $cur_attr->blink) {
+                if ($cur_attr->blink) {
+                    $open.= '<blink>';
+                } else {
+                    $close = '</blink>' . $close;
+                }
+            }
+            $output.= $close . $open;
+        }
+
+        $output.= htmlspecialchars($char);
+
+        return $output;
+    }
+
+    /**
+     * Returns the current screen without preformating
+     *
+     * @access private
+     * @return string
+     */
+    function _getScreen()
+    {
+        $output = '';
+        $last_attr = $this->base_attr_cell;
+        for ($i = 0; $i <= $this->max_y; $i++) {
+            for ($j = 0; $j <= $this->max_x; $j++) {
+                $cur_attr = $this->attrs[$i][$j];
+                $output.= $this->_processCoordinate($last_attr, $cur_attr, isset($this->screen[$i][$j]) ? $this->screen[$i][$j] : '');
+                $last_attr = $this->attrs[$i][$j];
+            }
+            $output.= "\r\n";
+        }
+        $output = substr($output, 0, -2);
+        // close any remaining open tags
+        $output.= $this->_processCoordinate($last_attr, $this->base_attr_cell, '');
+        return rtrim($output);
+    }
+
+    /**
+     * Returns the current screen
+     *
+     * @access public
+     * @return string
+     */
+    function getScreen()
+    {
+        return '<pre width="' . ($this->max_x + 1) . '" style="color: white; background: black">' . $this->_getScreen() . '</pre>';
+    }
+
+    /**
+     * Returns the current screen and the x previous lines
+     *
+     * @access public
+     * @return string
+     */
+    function getHistory()
+    {
+        $scrollback = '';
+        $last_attr = $this->base_attr_cell;
+        for ($i = 0; $i < count($this->history); $i++) {
+            for ($j = 0; $j <= $this->max_x + 1; $j++) {
+                $cur_attr = $this->history_attrs[$i][$j];
+                $scrollback.= $this->_processCoordinate($last_attr, $cur_attr, isset($this->history[$i][$j]) ? $this->history[$i][$j] : '');
+                $last_attr = $this->history_attrs[$i][$j];
+            }
+            $scrollback.= "\r\n";
+        }
+        $base_attr_cell = $this->base_attr_cell;
+        $this->base_attr_cell = $last_attr;
+        $scrollback.= $this->_getScreen();
+        $this->base_attr_cell = $base_attr_cell;
+
+        return '<pre width="' . ($this->max_x + 1) . '" style="color: white; background: black">' . $scrollback . '</span></pre>';
+    }
+}
diff --git a/lib/php/phpseclib/File/ASN1.php b/lib/php/phpseclib/File/ASN1.php
new file mode 100644
index 00000000..dd85f6d5
--- /dev/null
+++ b/lib/php/phpseclib/File/ASN1.php
@@ -0,0 +1,1485 @@
+<?php
+
+/**
+ * Pure-PHP ASN.1 Parser
+ *
+ * PHP versions 4 and 5
+ *
+ * ASN.1 provides the semantics for data encoded using various schemes.  The most commonly
+ * utilized scheme is DER or the "Distinguished Encoding Rules".  PEM's are base64 encoded
+ * DER blobs.
+ *
+ * File_ASN1 decodes and encodes DER formatted messages and places them in a semantic context.
+ *
+ * Uses the 1988 ASN.1 syntax.
+ *
+ * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @category  File
+ * @package   File_ASN1
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2012 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+/**#@+
+ * Tag Classes
+ *
+ * @access private
+ * @link http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf#page=12
+ */
+define('FILE_ASN1_CLASS_UNIVERSAL',        0);
+define('FILE_ASN1_CLASS_APPLICATION',      1);
+define('FILE_ASN1_CLASS_CONTEXT_SPECIFIC', 2);
+define('FILE_ASN1_CLASS_PRIVATE',          3);
+/**#@-*/
+
+/**#@+
+ * Tag Classes
+ *
+ * @access private
+ * @link http://www.obj-sys.com/asn1tutorial/node124.html
+ */
+define('FILE_ASN1_TYPE_BOOLEAN',           1);
+define('FILE_ASN1_TYPE_INTEGER',           2);
+define('FILE_ASN1_TYPE_BIT_STRING',        3);
+define('FILE_ASN1_TYPE_OCTET_STRING',      4);
+define('FILE_ASN1_TYPE_NULL',              5);
+define('FILE_ASN1_TYPE_OBJECT_IDENTIFIER', 6);
+//define('FILE_ASN1_TYPE_OBJECT_DESCRIPTOR', 7);
+//define('FILE_ASN1_TYPE_INSTANCE_OF',       8); // EXTERNAL
+define('FILE_ASN1_TYPE_REAL',              9);
+define('FILE_ASN1_TYPE_ENUMERATED',       10);
+//define('FILE_ASN1_TYPE_EMBEDDED',         11);
+define('FILE_ASN1_TYPE_UTF8_STRING',      12);
+//define('FILE_ASN1_TYPE_RELATIVE_OID',     13);
+define('FILE_ASN1_TYPE_SEQUENCE',         16); // SEQUENCE OF
+define('FILE_ASN1_TYPE_SET',              17); // SET OF
+/**#@-*/
+/**#@+
+ * More Tag Classes
+ *
+ * @access private
+ * @link http://www.obj-sys.com/asn1tutorial/node10.html
+ */
+define('FILE_ASN1_TYPE_NUMERIC_STRING',   18);
+define('FILE_ASN1_TYPE_PRINTABLE_STRING', 19);
+define('FILE_ASN1_TYPE_TELETEX_STRING',   20); // T61String
+define('FILE_ASN1_TYPE_VIDEOTEX_STRING',  21);
+define('FILE_ASN1_TYPE_IA5_STRING',       22);
+define('FILE_ASN1_TYPE_UTC_TIME',         23);
+define('FILE_ASN1_TYPE_GENERALIZED_TIME', 24);
+define('FILE_ASN1_TYPE_GRAPHIC_STRING',   25);
+define('FILE_ASN1_TYPE_VISIBLE_STRING',   26); // ISO646String
+define('FILE_ASN1_TYPE_GENERAL_STRING',   27);
+define('FILE_ASN1_TYPE_UNIVERSAL_STRING', 28);
+//define('FILE_ASN1_TYPE_CHARACTER_STRING', 29);
+define('FILE_ASN1_TYPE_BMP_STRING',       30);
+/**#@-*/
+
+/**#@+
+ * Tag Aliases
+ *
+ * These tags are kinda place holders for other tags.
+ *
+ * @access private
+ */
+define('FILE_ASN1_TYPE_CHOICE',          -1);
+define('FILE_ASN1_TYPE_ANY',             -2);
+/**#@-*/
+
+/**
+ * ASN.1 Element
+ *
+ * Bypass normal encoding rules in File_ASN1::encodeDER()
+ *
+ * @package File_ASN1
+ * @author  Jim Wigginton <terrafrost@php.net>
+ * @access  public
+ */
+class File_ASN1_Element
+{
+    /**
+     * Raw element value
+     *
+     * @var string
+     * @access private
+     */
+    var $element;
+
+    /**
+     * Constructor
+     *
+     * @param string $encoded
+     * @return File_ASN1_Element
+     * @access public
+     */
+    function __construct($encoded)
+    {
+        $this->element = $encoded;
+    }
+
+    /**
+     * PHP4 compatible Default Constructor.
+     *
+     * @see self::__construct()
+     * @param int $mode
+     * @access public
+     */
+    function File_ASN1_Element($encoded)
+    {
+        $this->__construct($encoded);
+    }
+}
+
+/**
+ * Pure-PHP ASN.1 Parser
+ *
+ * @package File_ASN1
+ * @author  Jim Wigginton <terrafrost@php.net>
+ * @access  public
+ */
+class File_ASN1
+{
+    /**
+     * ASN.1 object identifier
+     *
+     * @var array
+     * @access private
+     * @link http://en.wikipedia.org/wiki/Object_identifier
+     */
+    var $oids = array();
+
+    /**
+     * Default date format
+     *
+     * @var string
+     * @access private
+     * @link http://php.net/class.datetime
+     */
+    var $format = 'D, d M Y H:i:s O';
+
+    /**
+     * Default date format
+     *
+     * @var array
+     * @access private
+     * @see self::setTimeFormat()
+     * @see self::asn1map()
+     * @link http://php.net/class.datetime
+     */
+    var $encoded;
+
+    /**
+     * Filters
+     *
+     * If the mapping type is FILE_ASN1_TYPE_ANY what do we actually encode it as?
+     *
+     * @var array
+     * @access private
+     * @see self::_encode_der()
+     */
+    var $filters;
+
+    /**
+     * Type mapping table for the ANY type.
+     *
+     * Structured or unknown types are mapped to a FILE_ASN1_Element.
+     * Unambiguous types get the direct mapping (int/real/bool).
+     * Others are mapped as a choice, with an extra indexing level.
+     *
+     * @var array
+     * @access public
+     */
+    var $ANYmap = array(
+        FILE_ASN1_TYPE_BOOLEAN              => true,
+        FILE_ASN1_TYPE_INTEGER              => true,
+        FILE_ASN1_TYPE_BIT_STRING           => 'bitString',
+        FILE_ASN1_TYPE_OCTET_STRING         => 'octetString',
+        FILE_ASN1_TYPE_NULL                 => 'null',
+        FILE_ASN1_TYPE_OBJECT_IDENTIFIER    => 'objectIdentifier',
+        FILE_ASN1_TYPE_REAL                 => true,
+        FILE_ASN1_TYPE_ENUMERATED           => 'enumerated',
+        FILE_ASN1_TYPE_UTF8_STRING          => 'utf8String',
+        FILE_ASN1_TYPE_NUMERIC_STRING       => 'numericString',
+        FILE_ASN1_TYPE_PRINTABLE_STRING     => 'printableString',
+        FILE_ASN1_TYPE_TELETEX_STRING       => 'teletexString',
+        FILE_ASN1_TYPE_VIDEOTEX_STRING      => 'videotexString',
+        FILE_ASN1_TYPE_IA5_STRING           => 'ia5String',
+        FILE_ASN1_TYPE_UTC_TIME             => 'utcTime',
+        FILE_ASN1_TYPE_GENERALIZED_TIME     => 'generalTime',
+        FILE_ASN1_TYPE_GRAPHIC_STRING       => 'graphicString',
+        FILE_ASN1_TYPE_VISIBLE_STRING       => 'visibleString',
+        FILE_ASN1_TYPE_GENERAL_STRING       => 'generalString',
+        FILE_ASN1_TYPE_UNIVERSAL_STRING     => 'universalString',
+        //FILE_ASN1_TYPE_CHARACTER_STRING     => 'characterString',
+        FILE_ASN1_TYPE_BMP_STRING           => 'bmpString'
+    );
+
+    /**
+     * String type to character size mapping table.
+     *
+     * Non-convertable types are absent from this table.
+     * size == 0 indicates variable length encoding.
+     *
+     * @var array
+     * @access public
+     */
+    var $stringTypeSize = array(
+        FILE_ASN1_TYPE_UTF8_STRING      => 0,
+        FILE_ASN1_TYPE_BMP_STRING       => 2,
+        FILE_ASN1_TYPE_UNIVERSAL_STRING => 4,
+        FILE_ASN1_TYPE_PRINTABLE_STRING => 1,
+        FILE_ASN1_TYPE_TELETEX_STRING   => 1,
+        FILE_ASN1_TYPE_IA5_STRING       => 1,
+        FILE_ASN1_TYPE_VISIBLE_STRING   => 1,
+    );
+
+    /**
+     * Default Constructor.
+     *
+     * @access public
+     */
+    function __construct()
+    {
+        static $static_init = null;
+        if (!$static_init) {
+            $static_init = true;
+            if (!class_exists('Math_BigInteger')) {
+                include_once 'Math/BigInteger.php';
+            }
+        }
+    }
+
+    /**
+     * PHP4 compatible Default Constructor.
+     *
+     * @see self::__construct()
+     * @access public
+     */
+    function File_ASN1()
+    {
+        $this->__construct($mode);
+    }
+
+    /**
+     * Parse BER-encoding
+     *
+     * Serves a similar purpose to openssl's asn1parse
+     *
+     * @param string $encoded
+     * @return array
+     * @access public
+     */
+    function decodeBER($encoded)
+    {
+        if (is_object($encoded) && strtolower(get_class($encoded)) == 'file_asn1_element') {
+            $encoded = $encoded->element;
+        }
+
+        $this->encoded = $encoded;
+        // encapsulate in an array for BC with the old decodeBER
+        return array($this->_decode_ber($encoded));
+    }
+
+    /**
+     * Parse BER-encoding (Helper function)
+     *
+     * Sometimes we want to get the BER encoding of a particular tag.  $start lets us do that without having to reencode.
+     * $encoded is passed by reference for the recursive calls done for FILE_ASN1_TYPE_BIT_STRING and
+     * FILE_ASN1_TYPE_OCTET_STRING. In those cases, the indefinite length is used.
+     *
+     * @param string $encoded
+     * @param int $start
+     * @param int $encoded_pos
+     * @return array
+     * @access private
+     */
+    function _decode_ber($encoded, $start = 0, $encoded_pos = 0)
+    {
+        $current = array('start' => $start);
+
+        $type = ord($encoded[$encoded_pos++]);
+        $start++;
+
+        $constructed = ($type >> 5) & 1;
+
+        $tag = $type & 0x1F;
+        if ($tag == 0x1F) {
+            $tag = 0;
+            // process septets (since the eighth bit is ignored, it's not an octet)
+            do {
+                $loop = ord($encoded[0]) >> 7;
+                $tag <<= 7;
+                $tag |= ord($encoded[$encoded_pos++]) & 0x7F;
+                $start++;
+            } while ($loop);
+        }
+
+        // Length, as discussed in paragraph 8.1.3 of X.690-0207.pdf#page=13
+        $length = ord($encoded[$encoded_pos++]);
+        $start++;
+        if ($length == 0x80) { // indefinite length
+            // "[A sender shall] use the indefinite form (see 8.1.3.6) if the encoding is constructed and is not all
+            //  immediately available." -- paragraph 8.1.3.2.c
+            $length = strlen($encoded) - $encoded_pos;
+        } elseif ($length & 0x80) { // definite length, long form
+            // technically, the long form of the length can be represented by up to 126 octets (bytes), but we'll only
+            // support it up to four.
+            $length&= 0x7F;
+            $temp = substr($encoded, $encoded_pos, $length);
+            $encoded_pos += $length;
+            // tags of indefinte length don't really have a header length; this length includes the tag
+            $current+= array('headerlength' => $length + 2);
+            $start+= $length;
+            extract(unpack('Nlength', substr(str_pad($temp, 4, chr(0), STR_PAD_LEFT), -4)));
+        } else {
+            $current+= array('headerlength' => 2);
+        }
+
+        if ($length > (strlen($encoded) - $encoded_pos)) {
+            return false;
+        }
+
+        $content = substr($encoded, $encoded_pos, $length);
+        $content_pos = 0;
+
+        // at this point $length can be overwritten. it's only accurate for definite length things as is
+
+        /* Class is UNIVERSAL, APPLICATION, PRIVATE, or CONTEXT-SPECIFIC. The UNIVERSAL class is restricted to the ASN.1
+           built-in types. It defines an application-independent data type that must be distinguishable from all other
+           data types. The other three classes are user defined. The APPLICATION class distinguishes data types that
+           have a wide, scattered use within a particular presentation context. PRIVATE distinguishes data types within
+           a particular organization or country. CONTEXT-SPECIFIC distinguishes members of a sequence or set, the
+           alternatives of a CHOICE, or universally tagged set members. Only the class number appears in braces for this
+           data type; the term CONTEXT-SPECIFIC does not appear.
+
+             -- http://www.obj-sys.com/asn1tutorial/node12.html */
+        $class = ($type >> 6) & 3;
+        switch ($class) {
+            case FILE_ASN1_CLASS_APPLICATION:
+            case FILE_ASN1_CLASS_PRIVATE:
+            case FILE_ASN1_CLASS_CONTEXT_SPECIFIC:
+                if (!$constructed) {
+                    return array(
+                        'type'     => $class,
+                        'constant' => $tag,
+                        'content'  => $content,
+                        'length'   => $length + $start - $current['start']
+                    );
+                }
+
+                $newcontent = array();
+                $remainingLength = $length;
+                while ($remainingLength > 0) {
+                    $temp = $this->_decode_ber($content, $start, $content_pos);
+                    if ($temp === false) {
+                        break;
+                    }
+                    $length = $temp['length'];
+                    // end-of-content octets - see paragraph 8.1.5
+                    if (substr($content, $content_pos + $length, 2) == "\0\0") {
+                        $length+= 2;
+                        $start+= $length;
+                        $newcontent[] = $temp;
+                        break;
+                    }
+                    $start+= $length;
+                    $remainingLength-= $length;
+                    $newcontent[] = $temp;
+                    $content_pos += $length;
+                }
+
+                return array(
+                    'type'     => $class,
+                    'constant' => $tag,
+                    // the array encapsulation is for BC with the old format
+                    'content'  => $newcontent,
+                    // the only time when $content['headerlength'] isn't defined is when the length is indefinite.
+                    // the absence of $content['headerlength'] is how we know if something is indefinite or not.
+                    // technically, it could be defined to be 2 and then another indicator could be used but whatever.
+                    'length'   => $start - $current['start']
+                ) + $current;
+        }
+
+        $current+= array('type' => $tag);
+
+        // decode UNIVERSAL tags
+        switch ($tag) {
+            case FILE_ASN1_TYPE_BOOLEAN:
+                // "The contents octets shall consist of a single octet." -- paragraph 8.2.1
+                //if (strlen($content) != 1) {
+                //    return false;
+                //}
+                $current['content'] = (bool) ord($content[$content_pos]);
+                break;
+            case FILE_ASN1_TYPE_INTEGER:
+            case FILE_ASN1_TYPE_ENUMERATED:
+                $current['content'] = new Math_BigInteger(substr($content, $content_pos), -256);
+                break;
+            case FILE_ASN1_TYPE_REAL: // not currently supported
+                return false;
+            case FILE_ASN1_TYPE_BIT_STRING:
+                // The initial octet shall encode, as an unsigned binary integer with bit 1 as the least significant bit,
+                // the number of unused bits in the final subsequent octet. The number shall be in the range zero to
+                // seven.
+                if (!$constructed) {
+                    $current['content'] = substr($content, $content_pos);
+                } else {
+                    $temp = $this->_decode_ber($content, $start, $content_pos);
+                    if ($temp === false) {
+                        return false;
+                    }
+                    $length-= (strlen($content) - $content_pos);
+                    $last = count($temp) - 1;
+                    for ($i = 0; $i < $last; $i++) {
+                        // all subtags should be bit strings
+                        //if ($temp[$i]['type'] != FILE_ASN1_TYPE_BIT_STRING) {
+                        //    return false;
+                        //}
+                        $current['content'].= substr($temp[$i]['content'], 1);
+                    }
+                    // all subtags should be bit strings
+                    //if ($temp[$last]['type'] != FILE_ASN1_TYPE_BIT_STRING) {
+                    //    return false;
+                    //}
+                    $current['content'] = $temp[$last]['content'][0] . $current['content'] . substr($temp[$i]['content'], 1);
+                }
+                break;
+            case FILE_ASN1_TYPE_OCTET_STRING:
+                if (!$constructed) {
+                    $current['content'] = substr($content, $content_pos);
+                } else {
+                    $current['content'] = '';
+                    $length = 0;
+                    while (substr($content, $content_pos, 2) != "\0\0") {
+                        $temp = $this->_decode_ber($content, $length + $start, $content_pos);
+                        if ($temp === false) {
+                            return false;
+                        }
+                        $content_pos += $temp['length'];
+                        // all subtags should be octet strings
+                        //if ($temp['type'] != FILE_ASN1_TYPE_OCTET_STRING) {
+                        //    return false;
+                        //}
+                        $current['content'].= $temp['content'];
+                        $length+= $temp['length'];
+                    }
+                    if (substr($content, $content_pos, 2) == "\0\0") {
+                        $length+= 2; // +2 for the EOC
+                    }
+                }
+                break;
+            case FILE_ASN1_TYPE_NULL:
+                // "The contents octets shall not contain any octets." -- paragraph 8.8.2
+                //if (strlen($content)) {
+                //    return false;
+                //}
+                break;
+            case FILE_ASN1_TYPE_SEQUENCE:
+            case FILE_ASN1_TYPE_SET:
+                $offset = 0;
+                $current['content'] = array();
+                $content_len = strlen($content);
+                while ($content_pos < $content_len) {
+                    // if indefinite length construction was used and we have an end-of-content string next
+                    // see paragraphs 8.1.1.3, 8.1.3.2, 8.1.3.6, 8.1.5, and (for an example) 8.6.4.2
+                    if (!isset($current['headerlength']) && substr($content, $content_pos, 2) == "\0\0") {
+                        $length = $offset + 2; // +2 for the EOC
+                        break 2;
+                    }
+                    $temp = $this->_decode_ber($content, $start + $offset, $content_pos);
+                    if ($temp === false) {
+                        return false;
+                    }
+                    $content_pos += $temp['length'];
+                    $current['content'][] = $temp;
+                    $offset+= $temp['length'];
+                }
+                break;
+            case FILE_ASN1_TYPE_OBJECT_IDENTIFIER:
+                $temp = ord($content[$content_pos++]);
+                $current['content'] = sprintf('%d.%d', floor($temp / 40), $temp % 40);
+                $valuen = 0;
+                // process septets
+                $content_len = strlen($content);
+                while ($content_pos < $content_len) {
+                    $temp = ord($content[$content_pos++]);
+                    $valuen <<= 7;
+                    $valuen |= $temp & 0x7F;
+                    if (~$temp & 0x80) {
+                        $current['content'].= ".$valuen";
+                        $valuen = 0;
+                    }
+                }
+                // the eighth bit of the last byte should not be 1
+                //if ($temp >> 7) {
+                //    return false;
+                //}
+                break;
+            /* Each character string type shall be encoded as if it had been declared:
+               [UNIVERSAL x] IMPLICIT OCTET STRING
+
+                 -- X.690-0207.pdf#page=23 (paragraph 8.21.3)
+
+               Per that, we're not going to do any validation.  If there are any illegal characters in the string,
+               we don't really care */
+            case FILE_ASN1_TYPE_NUMERIC_STRING:
+                // 0,1,2,3,4,5,6,7,8,9, and space
+            case FILE_ASN1_TYPE_PRINTABLE_STRING:
+                // Upper and lower case letters, digits, space, apostrophe, left/right parenthesis, plus sign, comma,
+                // hyphen, full stop, solidus, colon, equal sign, question mark
+            case FILE_ASN1_TYPE_TELETEX_STRING:
+                // The Teletex character set in CCITT's T61, space, and delete
+                // see http://en.wikipedia.org/wiki/Teletex#Character_sets
+            case FILE_ASN1_TYPE_VIDEOTEX_STRING:
+                // The Videotex character set in CCITT's T.100 and T.101, space, and delete
+            case FILE_ASN1_TYPE_VISIBLE_STRING:
+                // Printing character sets of international ASCII, and space
+            case FILE_ASN1_TYPE_IA5_STRING:
+                // International Alphabet 5 (International ASCII)
+            case FILE_ASN1_TYPE_GRAPHIC_STRING:
+                // All registered G sets, and space
+            case FILE_ASN1_TYPE_GENERAL_STRING:
+                // All registered C and G sets, space and delete
+            case FILE_ASN1_TYPE_UTF8_STRING:
+                // ????
+            case FILE_ASN1_TYPE_BMP_STRING:
+                $current['content'] = substr($content, $content_pos);
+                break;
+            case FILE_ASN1_TYPE_UTC_TIME:
+            case FILE_ASN1_TYPE_GENERALIZED_TIME:
+                $current['content'] = class_exists('DateTime') ?
+                    $this->_decodeDateTime(substr($content, $content_pos), $tag) :
+                    $this->_decodeUnixTime(substr($content, $content_pos), $tag);
+            default:
+        }
+
+        $start+= $length;
+
+        // ie. length is the length of the full TLV encoding - it's not just the length of the value
+        return $current + array('length' => $start - $current['start']);
+    }
+
+    /**
+     * ASN.1 Map
+     *
+     * Provides an ASN.1 semantic mapping ($mapping) from a parsed BER-encoding to a human readable format.
+     *
+     * "Special" mappings may be applied on a per tag-name basis via $special.
+     *
+     * @param array $decoded
+     * @param array $mapping
+     * @param array $special
+     * @return array
+     * @access public
+     */
+    function asn1map($decoded, $mapping, $special = array())
+    {
+        if (isset($mapping['explicit']) && is_array($decoded['content'])) {
+            $decoded = $decoded['content'][0];
+        }
+
+        switch (true) {
+            case $mapping['type'] == FILE_ASN1_TYPE_ANY:
+                $intype = $decoded['type'];
+                if (isset($decoded['constant']) || !isset($this->ANYmap[$intype]) || (ord($this->encoded[$decoded['start']]) & 0x20)) {
+                    return new File_ASN1_Element(substr($this->encoded, $decoded['start'], $decoded['length']));
+                }
+                $inmap = $this->ANYmap[$intype];
+                if (is_string($inmap)) {
+                    return array($inmap => $this->asn1map($decoded, array('type' => $intype) + $mapping, $special));
+                }
+                break;
+            case $mapping['type'] == FILE_ASN1_TYPE_CHOICE:
+                foreach ($mapping['children'] as $key => $option) {
+                    switch (true) {
+                        case isset($option['constant']) && $option['constant'] == $decoded['constant']:
+                        case !isset($option['constant']) && $option['type'] == $decoded['type']:
+                            $value = $this->asn1map($decoded, $option, $special);
+                            break;
+                        case !isset($option['constant']) && $option['type'] == FILE_ASN1_TYPE_CHOICE:
+                            $v = $this->asn1map($decoded, $option, $special);
+                            if (isset($v)) {
+                                $value = $v;
+                            }
+                    }
+                    if (isset($value)) {
+                        if (isset($special[$key])) {
+                            $value = call_user_func($special[$key], $value);
+                        }
+                        return array($key => $value);
+                    }
+                }
+                return null;
+            case isset($mapping['implicit']):
+            case isset($mapping['explicit']):
+            case $decoded['type'] == $mapping['type']:
+                break;
+            default:
+                // if $decoded['type'] and $mapping['type'] are both strings, but different types of strings,
+                // let it through
+                switch (true) {
+                    case $decoded['type'] < 18: // FILE_ASN1_TYPE_NUMERIC_STRING == 18
+                    case $decoded['type'] > 30: // FILE_ASN1_TYPE_BMP_STRING == 30
+                    case $mapping['type'] < 18:
+                    case $mapping['type'] > 30:
+                        return null;
+                }
+        }
+
+        if (isset($mapping['implicit'])) {
+            $decoded['type'] = $mapping['type'];
+        }
+
+        switch ($decoded['type']) {
+            case FILE_ASN1_TYPE_SEQUENCE:
+                $map = array();
+
+                // ignore the min and max
+                if (isset($mapping['min']) && isset($mapping['max'])) {
+                    $child = $mapping['children'];
+                    foreach ($decoded['content'] as $content) {
+                        if (($map[] = $this->asn1map($content, $child, $special)) === null) {
+                            return null;
+                        }
+                    }
+
+                    return $map;
+                }
+
+                $n = count($decoded['content']);
+                $i = 0;
+
+                foreach ($mapping['children'] as $key => $child) {
+                    $maymatch = $i < $n; // Match only existing input.
+                    if ($maymatch) {
+                        $temp = $decoded['content'][$i];
+
+                        if ($child['type'] != FILE_ASN1_TYPE_CHOICE) {
+                            // Get the mapping and input class & constant.
+                            $childClass = $tempClass = FILE_ASN1_CLASS_UNIVERSAL;
+                            $constant = null;
+                            if (isset($temp['constant'])) {
+                                $tempClass = $temp['type'];
+                            }
+                            if (isset($child['class'])) {
+                                $childClass = $child['class'];
+                                $constant = $child['cast'];
+                            } elseif (isset($child['constant'])) {
+                                $childClass = FILE_ASN1_CLASS_CONTEXT_SPECIFIC;
+                                $constant = $child['constant'];
+                            }
+
+                            if (isset($constant) && isset($temp['constant'])) {
+                                // Can only match if constants and class match.
+                                $maymatch = $constant == $temp['constant'] && $childClass == $tempClass;
+                            } else {
+                                // Can only match if no constant expected and type matches or is generic.
+                                $maymatch = !isset($child['constant']) && array_search($child['type'], array($temp['type'], FILE_ASN1_TYPE_ANY, FILE_ASN1_TYPE_CHOICE)) !== false;
+                            }
+                        }
+                    }
+
+                    if ($maymatch) {
+                        // Attempt submapping.
+                        $candidate = $this->asn1map($temp, $child, $special);
+                        $maymatch = $candidate !== null;
+                    }
+
+                    if ($maymatch) {
+                        // Got the match: use it.
+                        if (isset($special[$key])) {
+                            $candidate = call_user_func($special[$key], $candidate);
+                        }
+                        $map[$key] = $candidate;
+                        $i++;
+                    } elseif (isset($child['default'])) {
+                        $map[$key] = $child['default']; // Use default.
+                    } elseif (!isset($child['optional'])) {
+                        return null; // Syntax error.
+                    }
+                }
+
+                // Fail mapping if all input items have not been consumed.
+                return $i < $n ? null: $map;
+
+            // the main diff between sets and sequences is the encapsulation of the foreach in another for loop
+            case FILE_ASN1_TYPE_SET:
+                $map = array();
+
+                // ignore the min and max
+                if (isset($mapping['min']) && isset($mapping['max'])) {
+                    $child = $mapping['children'];
+                    foreach ($decoded['content'] as $content) {
+                        if (($map[] = $this->asn1map($content, $child, $special)) === null) {
+                            return null;
+                        }
+                    }
+
+                    return $map;
+                }
+
+                for ($i = 0; $i < count($decoded['content']); $i++) {
+                    $temp = $decoded['content'][$i];
+                    $tempClass = FILE_ASN1_CLASS_UNIVERSAL;
+                    if (isset($temp['constant'])) {
+                        $tempClass = $temp['type'];
+                    }
+
+                    foreach ($mapping['children'] as $key => $child) {
+                        if (isset($map[$key])) {
+                            continue;
+                        }
+                        $maymatch = true;
+                        if ($child['type'] != FILE_ASN1_TYPE_CHOICE) {
+                            $childClass = FILE_ASN1_CLASS_UNIVERSAL;
+                            $constant = null;
+                            if (isset($child['class'])) {
+                                $childClass = $child['class'];
+                                $constant = $child['cast'];
+                            } elseif (isset($child['constant'])) {
+                                $childClass = FILE_ASN1_CLASS_CONTEXT_SPECIFIC;
+                                $constant = $child['constant'];
+                            }
+
+                            if (isset($constant) && isset($temp['constant'])) {
+                                // Can only match if constants and class match.
+                                $maymatch = $constant == $temp['constant'] && $childClass == $tempClass;
+                            } else {
+                                // Can only match if no constant expected and type matches or is generic.
+                                $maymatch = !isset($child['constant']) && array_search($child['type'], array($temp['type'], FILE_ASN1_TYPE_ANY, FILE_ASN1_TYPE_CHOICE)) !== false;
+                            }
+                        }
+
+                        if ($maymatch) {
+                            // Attempt submapping.
+                            $candidate = $this->asn1map($temp, $child, $special);
+                            $maymatch = $candidate !== null;
+                        }
+
+                        if (!$maymatch) {
+                            break;
+                        }
+
+                        // Got the match: use it.
+                        if (isset($special[$key])) {
+                            $candidate = call_user_func($special[$key], $candidate);
+                        }
+                        $map[$key] = $candidate;
+                        break;
+                    }
+                }
+
+                foreach ($mapping['children'] as $key => $child) {
+                    if (!isset($map[$key])) {
+                        if (isset($child['default'])) {
+                            $map[$key] = $child['default'];
+                        } elseif (!isset($child['optional'])) {
+                            return null;
+                        }
+                    }
+                }
+                return $map;
+            case FILE_ASN1_TYPE_OBJECT_IDENTIFIER:
+                return isset($this->oids[$decoded['content']]) ? $this->oids[$decoded['content']] : $decoded['content'];
+            case FILE_ASN1_TYPE_UTC_TIME:
+            case FILE_ASN1_TYPE_GENERALIZED_TIME:
+                if (class_exists('DateTime')) {
+                    if (isset($mapping['implicit'])) {
+                        $decoded['content'] = $this->_decodeDateTime($decoded['content'], $decoded['type']);
+                    }
+                    if (!$decoded['content']) {
+                        return false;
+                    }
+                    return $decoded['content']->format($this->format);
+                } else {
+                    if (isset($mapping['implicit'])) {
+                        $decoded['content'] = $this->_decodeUnixTime($decoded['content'], $decoded['type']);
+                    }
+                    return @date($this->format, $decoded['content']);
+                }
+            case FILE_ASN1_TYPE_BIT_STRING:
+                if (isset($mapping['mapping'])) {
+                    $offset = ord($decoded['content'][0]);
+                    $size = (strlen($decoded['content']) - 1) * 8 - $offset;
+                    /*
+                       From X.680-0207.pdf#page=46 (21.7):
+
+                       "When a "NamedBitList" is used in defining a bitstring type ASN.1 encoding rules are free to add (or remove)
+                        arbitrarily any trailing 0 bits to (or from) values that are being encoded or decoded. Application designers should
+                        therefore ensure that different semantics are not associated with such values which differ only in the number of trailing
+                        0 bits."
+                    */
+                    $bits = count($mapping['mapping']) == $size ? array() : array_fill(0, count($mapping['mapping']) - $size, false);
+                    for ($i = strlen($decoded['content']) - 1; $i > 0; $i--) {
+                        $current = ord($decoded['content'][$i]);
+                        for ($j = $offset; $j < 8; $j++) {
+                            $bits[] = (bool) ($current & (1 << $j));
+                        }
+                        $offset = 0;
+                    }
+                    $values = array();
+                    $map = array_reverse($mapping['mapping']);
+                    foreach ($map as $i => $value) {
+                        if ($bits[$i]) {
+                            $values[] = $value;
+                        }
+                    }
+                    return $values;
+                }
+            case FILE_ASN1_TYPE_OCTET_STRING:
+                return base64_encode($decoded['content']);
+            case FILE_ASN1_TYPE_NULL:
+                return '';
+            case FILE_ASN1_TYPE_BOOLEAN:
+                return $decoded['content'];
+            case FILE_ASN1_TYPE_NUMERIC_STRING:
+            case FILE_ASN1_TYPE_PRINTABLE_STRING:
+            case FILE_ASN1_TYPE_TELETEX_STRING:
+            case FILE_ASN1_TYPE_VIDEOTEX_STRING:
+            case FILE_ASN1_TYPE_IA5_STRING:
+            case FILE_ASN1_TYPE_GRAPHIC_STRING:
+            case FILE_ASN1_TYPE_VISIBLE_STRING:
+            case FILE_ASN1_TYPE_GENERAL_STRING:
+            case FILE_ASN1_TYPE_UNIVERSAL_STRING:
+            case FILE_ASN1_TYPE_UTF8_STRING:
+            case FILE_ASN1_TYPE_BMP_STRING:
+                return $decoded['content'];
+            case FILE_ASN1_TYPE_INTEGER:
+            case FILE_ASN1_TYPE_ENUMERATED:
+                $temp = $decoded['content'];
+                if (isset($mapping['implicit'])) {
+                    $temp = new Math_BigInteger($decoded['content'], -256);
+                }
+                if (isset($mapping['mapping'])) {
+                    $temp = (int) $temp->toString();
+                    return isset($mapping['mapping'][$temp]) ?
+                        $mapping['mapping'][$temp] :
+                        false;
+                }
+                return $temp;
+        }
+    }
+
+    /**
+     * ASN.1 Encode
+     *
+     * DER-encodes an ASN.1 semantic mapping ($mapping).  Some libraries would probably call this function
+     * an ASN.1 compiler.
+     *
+     * "Special" mappings can be applied via $special.
+     *
+     * @param string $source
+     * @param string $mapping
+     * @param int $idx
+     * @return string
+     * @access public
+     */
+    function encodeDER($source, $mapping, $special = array())
+    {
+        $this->location = array();
+        return $this->_encode_der($source, $mapping, null, $special);
+    }
+
+    /**
+     * ASN.1 Encode (Helper function)
+     *
+     * @param string $source
+     * @param string $mapping
+     * @param int $idx
+     * @return string
+     * @access private
+     */
+    function _encode_der($source, $mapping, $idx = null, $special = array())
+    {
+        if (is_object($source) && strtolower(get_class($source)) == 'file_asn1_element') {
+            return $source->element;
+        }
+
+        // do not encode (implicitly optional) fields with value set to default
+        if (isset($mapping['default']) && $source === $mapping['default']) {
+            return '';
+        }
+
+        if (isset($idx)) {
+            if (isset($special[$idx])) {
+                $source = call_user_func($special[$idx], $source);
+            }
+            $this->location[] = $idx;
+        }
+
+        $tag = $mapping['type'];
+
+        switch ($tag) {
+            case FILE_ASN1_TYPE_SET:    // Children order is not important, thus process in sequence.
+            case FILE_ASN1_TYPE_SEQUENCE:
+                $tag|= 0x20; // set the constructed bit
+
+                // ignore the min and max
+                if (isset($mapping['min']) && isset($mapping['max'])) {
+                    $value = array();
+                    $child = $mapping['children'];
+
+                    foreach ($source as $content) {
+                        $temp = $this->_encode_der($content, $child, null, $special);
+                        if ($temp === false) {
+                            return false;
+                        }
+                        $value[]= $temp;
+                    }
+                    /* "The encodings of the component values of a set-of value shall appear in ascending order, the encodings being compared
+                        as octet strings with the shorter components being padded at their trailing end with 0-octets.
+                        NOTE - The padding octets are for comparison purposes only and do not appear in the encodings."
+
+                       -- sec 11.6 of http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf  */
+                    if ($mapping['type'] == FILE_ASN1_TYPE_SET) {
+                        sort($value);
+                    }
+                    $value = implode($value, '');
+                    break;
+                }
+
+                $value = '';
+                foreach ($mapping['children'] as $key => $child) {
+                    if (!array_key_exists($key, $source)) {
+                        if (!isset($child['optional'])) {
+                            return false;
+                        }
+                        continue;
+                    }
+
+                    $temp = $this->_encode_der($source[$key], $child, $key, $special);
+                    if ($temp === false) {
+                        return false;
+                    }
+
+                    // An empty child encoding means it has been optimized out.
+                    // Else we should have at least one tag byte.
+                    if ($temp === '') {
+                        continue;
+                    }
+
+                    // if isset($child['constant']) is true then isset($child['optional']) should be true as well
+                    if (isset($child['constant'])) {
+                        /*
+                           From X.680-0207.pdf#page=58 (30.6):
+
+                           "The tagging construction specifies explicit tagging if any of the following holds:
+                            ...
+                            c) the "Tag Type" alternative is used and the value of "TagDefault" for the module is IMPLICIT TAGS or
+                            AUTOMATIC TAGS, but the type defined by "Type" is an untagged choice type, an untagged open type, or
+                            an untagged "DummyReference" (see ITU-T Rec. X.683 | ISO/IEC 8824-4, 8.3)."
+                         */
+                        if (isset($child['explicit']) || $child['type'] == FILE_ASN1_TYPE_CHOICE) {
+                            $subtag = chr((FILE_ASN1_CLASS_CONTEXT_SPECIFIC << 6) | 0x20 | $child['constant']);
+                            $temp = $subtag . $this->_encodeLength(strlen($temp)) . $temp;
+                        } else {
+                            $subtag = chr((FILE_ASN1_CLASS_CONTEXT_SPECIFIC << 6) | (ord($temp[0]) & 0x20) | $child['constant']);
+                            $temp = $subtag . substr($temp, 1);
+                        }
+                    }
+                    $value.= $temp;
+                }
+                break;
+            case FILE_ASN1_TYPE_CHOICE:
+                $temp = false;
+
+                foreach ($mapping['children'] as $key => $child) {
+                    if (!isset($source[$key])) {
+                        continue;
+                    }
+
+                    $temp = $this->_encode_der($source[$key], $child, $key, $special);
+                    if ($temp === false) {
+                        return false;
+                    }
+
+                    // An empty child encoding means it has been optimized out.
+                    // Else we should have at least one tag byte.
+                    if ($temp === '') {
+                        continue;
+                    }
+
+                    $tag = ord($temp[0]);
+
+                    // if isset($child['constant']) is true then isset($child['optional']) should be true as well
+                    if (isset($child['constant'])) {
+                        if (isset($child['explicit']) || $child['type'] == FILE_ASN1_TYPE_CHOICE) {
+                            $subtag = chr((FILE_ASN1_CLASS_CONTEXT_SPECIFIC << 6) | 0x20 | $child['constant']);
+                            $temp = $subtag . $this->_encodeLength(strlen($temp)) . $temp;
+                        } else {
+                            $subtag = chr((FILE_ASN1_CLASS_CONTEXT_SPECIFIC << 6) | (ord($temp[0]) & 0x20) | $child['constant']);
+                            $temp = $subtag . substr($temp, 1);
+                        }
+                    }
+                }
+
+                if (isset($idx)) {
+                    array_pop($this->location);
+                }
+
+                if ($temp && isset($mapping['cast'])) {
+                    $temp[0] = chr(($mapping['class'] << 6) | ($tag & 0x20) | $mapping['cast']);
+                }
+
+                return $temp;
+            case FILE_ASN1_TYPE_INTEGER:
+            case FILE_ASN1_TYPE_ENUMERATED:
+                if (!isset($mapping['mapping'])) {
+                    if (is_numeric($source)) {
+                        $source = new Math_BigInteger($source);
+                    }
+                    $value = $source->toBytes(true);
+                } else {
+                    $value = array_search($source, $mapping['mapping']);
+                    if ($value === false) {
+                        return false;
+                    }
+                    $value = new Math_BigInteger($value);
+                    $value = $value->toBytes(true);
+                }
+                if (!strlen($value)) {
+                    $value = chr(0);
+                }
+                break;
+            case FILE_ASN1_TYPE_UTC_TIME:
+            case FILE_ASN1_TYPE_GENERALIZED_TIME:
+                $format = $mapping['type'] == FILE_ASN1_TYPE_UTC_TIME ? 'y' : 'Y';
+                $format.= 'mdHis';
+                if (!class_exists('DateTime')) {
+                    $value = @gmdate($format, strtotime($source)) . 'Z';
+                } else {
+                    $date = new DateTime($source, new DateTimeZone('GMT'));
+                    $value = $date->format($format) . 'Z';
+                }
+                break;
+            case FILE_ASN1_TYPE_BIT_STRING:
+                if (isset($mapping['mapping'])) {
+                    $bits = array_fill(0, count($mapping['mapping']), 0);
+                    $size = 0;
+                    for ($i = 0; $i < count($mapping['mapping']); $i++) {
+                        if (in_array($mapping['mapping'][$i], $source)) {
+                            $bits[$i] = 1;
+                            $size = $i;
+                        }
+                    }
+
+                    if (isset($mapping['min']) && $mapping['min'] >= 1 && $size < $mapping['min']) {
+                        $size = $mapping['min'] - 1;
+                    }
+
+                    $offset = 8 - (($size + 1) & 7);
+                    $offset = $offset !== 8 ? $offset : 0;
+
+                    $value = chr($offset);
+
+                    for ($i = $size + 1; $i < count($mapping['mapping']); $i++) {
+                        unset($bits[$i]);
+                    }
+
+                    $bits = implode('', array_pad($bits, $size + $offset + 1, 0));
+                    $bytes = explode(' ', rtrim(chunk_split($bits, 8, ' ')));
+                    foreach ($bytes as $byte) {
+                        $value.= chr(bindec($byte));
+                    }
+
+                    break;
+                }
+            case FILE_ASN1_TYPE_OCTET_STRING:
+                /* The initial octet shall encode, as an unsigned binary integer with bit 1 as the least significant bit,
+                   the number of unused bits in the final subsequent octet. The number shall be in the range zero to seven.
+
+                   -- http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf#page=16 */
+                $value = base64_decode($source);
+                break;
+            case FILE_ASN1_TYPE_OBJECT_IDENTIFIER:
+                $oid = preg_match('#(?:\d+\.)+#', $source) ? $source : array_search($source, $this->oids);
+                if ($oid === false) {
+                    user_error('Invalid OID');
+                    return false;
+                }
+                $value = '';
+                $parts = explode('.', $oid);
+                $value = chr(40 * $parts[0] + $parts[1]);
+                for ($i = 2; $i < count($parts); $i++) {
+                    $temp = '';
+                    if (!$parts[$i]) {
+                        $temp = "\0";
+                    } else {
+                        while ($parts[$i]) {
+                            $temp = chr(0x80 | ($parts[$i] & 0x7F)) . $temp;
+                            $parts[$i] >>= 7;
+                        }
+                        $temp[strlen($temp) - 1] = $temp[strlen($temp) - 1] & chr(0x7F);
+                    }
+                    $value.= $temp;
+                }
+                break;
+            case FILE_ASN1_TYPE_ANY:
+                $loc = $this->location;
+                if (isset($idx)) {
+                    array_pop($this->location);
+                }
+
+                switch (true) {
+                    case !isset($source):
+                        return $this->_encode_der(null, array('type' => FILE_ASN1_TYPE_NULL) + $mapping, null, $special);
+                    case is_int($source):
+                    case is_object($source) && strtolower(get_class($source)) == 'math_biginteger':
+                        return $this->_encode_der($source, array('type' => FILE_ASN1_TYPE_INTEGER) + $mapping, null, $special);
+                    case is_float($source):
+                        return $this->_encode_der($source, array('type' => FILE_ASN1_TYPE_REAL) + $mapping, null, $special);
+                    case is_bool($source):
+                        return $this->_encode_der($source, array('type' => FILE_ASN1_TYPE_BOOLEAN) + $mapping, null, $special);
+                    case is_array($source) && count($source) == 1:
+                        $typename = implode('', array_keys($source));
+                        $outtype = array_search($typename, $this->ANYmap, true);
+                        if ($outtype !== false) {
+                            return $this->_encode_der($source[$typename], array('type' => $outtype) + $mapping, null, $special);
+                        }
+                }
+
+                $filters = $this->filters;
+                foreach ($loc as $part) {
+                    if (!isset($filters[$part])) {
+                        $filters = false;
+                        break;
+                    }
+                    $filters = $filters[$part];
+                }
+                if ($filters === false) {
+                    user_error('No filters defined for ' . implode('/', $loc));
+                    return false;
+                }
+                return $this->_encode_der($source, $filters + $mapping, null, $special);
+            case FILE_ASN1_TYPE_NULL:
+                $value = '';
+                break;
+            case FILE_ASN1_TYPE_NUMERIC_STRING:
+            case FILE_ASN1_TYPE_TELETEX_STRING:
+            case FILE_ASN1_TYPE_PRINTABLE_STRING:
+            case FILE_ASN1_TYPE_UNIVERSAL_STRING:
+            case FILE_ASN1_TYPE_UTF8_STRING:
+            case FILE_ASN1_TYPE_BMP_STRING:
+            case FILE_ASN1_TYPE_IA5_STRING:
+            case FILE_ASN1_TYPE_VISIBLE_STRING:
+            case FILE_ASN1_TYPE_VIDEOTEX_STRING:
+            case FILE_ASN1_TYPE_GRAPHIC_STRING:
+            case FILE_ASN1_TYPE_GENERAL_STRING:
+                $value = $source;
+                break;
+            case FILE_ASN1_TYPE_BOOLEAN:
+                $value = $source ? "\xFF" : "\x00";
+                break;
+            default:
+                user_error('Mapping provides no type definition for ' . implode('/', $this->location));
+                return false;
+        }
+
+        if (isset($idx)) {
+            array_pop($this->location);
+        }
+
+        if (isset($mapping['cast'])) {
+            if (isset($mapping['explicit']) || $mapping['type'] == FILE_ASN1_TYPE_CHOICE) {
+                $value = chr($tag) . $this->_encodeLength(strlen($value)) . $value;
+                $tag = ($mapping['class'] << 6) | 0x20 | $mapping['cast'];
+            } else {
+                $tag = ($mapping['class'] << 6) | (ord($temp[0]) & 0x20) | $mapping['cast'];
+            }
+        }
+
+        return chr($tag) . $this->_encodeLength(strlen($value)) . $value;
+    }
+
+    /**
+     * DER-encode the length
+     *
+     * DER supports lengths up to (2**8)**127, however, we'll only support lengths up to (2**8)**4.  See
+     * {@link http://itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf#p=13 X.690 paragraph 8.1.3} for more information.
+     *
+     * @access private
+     * @param int $length
+     * @return string
+     */
+    function _encodeLength($length)
+    {
+        if ($length <= 0x7F) {
+            return chr($length);
+        }
+
+        $temp = ltrim(pack('N', $length), chr(0));
+        return pack('Ca*', 0x80 | strlen($temp), $temp);
+    }
+
+    /**
+     * BER-decode the time (using UNIX time)
+     *
+     * Called by _decode_ber() and in the case of implicit tags asn1map().
+     *
+     * @access private
+     * @param string $content
+     * @param int $tag
+     * @return string
+     */
+    function _decodeUnixTime($content, $tag)
+    {
+        /* UTCTime:
+           http://tools.ietf.org/html/rfc5280#section-4.1.2.5.1
+           http://www.obj-sys.com/asn1tutorial/node15.html
+
+           GeneralizedTime:
+           http://tools.ietf.org/html/rfc5280#section-4.1.2.5.2
+           http://www.obj-sys.com/asn1tutorial/node14.html */
+
+        $pattern = $tag == FILE_ASN1_TYPE_UTC_TIME ?
+            '#^(..)(..)(..)(..)(..)(..)?(.*)$#' :
+            '#(....)(..)(..)(..)(..)(..).*([Z+-].*)$#';
+
+        preg_match($pattern, $content, $matches);
+
+        list(, $year, $month, $day, $hour, $minute, $second, $timezone) = $matches;
+
+        if ($tag == FILE_ASN1_TYPE_UTC_TIME) {
+            $year = $year >= 50 ? "19$year" : "20$year";
+        }
+
+        if ($timezone == 'Z') {
+            $mktime = 'gmmktime';
+            $timezone = 0;
+        } elseif (preg_match('#([+-])(\d\d)(\d\d)#', $timezone, $matches)) {
+            $mktime = 'gmmktime';
+            $timezone = 60 * $matches[3] + 3600 * $matches[2];
+            if ($matches[1] == '-') {
+                $timezone = -$timezone;
+            }
+        } else {
+            $mktime = 'mktime';
+            $timezone = 0;
+        }
+
+        return @$mktime((int)$hour, (int)$minute, (int)$second, (int)$month, (int)$day, (int)$year) + $timezone;
+    }
+
+
+    /**
+     * BER-decode the time (using DateTime)
+     *
+     * Called by _decode_ber() and in the case of implicit tags asn1map().
+     *
+     * @access private
+     * @param string $content
+     * @param int $tag
+     * @return string
+     */
+    function _decodeDateTime($content, $tag)
+    {
+        /* UTCTime:
+           http://tools.ietf.org/html/rfc5280#section-4.1.2.5.1
+           http://www.obj-sys.com/asn1tutorial/node15.html
+
+           GeneralizedTime:
+           http://tools.ietf.org/html/rfc5280#section-4.1.2.5.2
+           http://www.obj-sys.com/asn1tutorial/node14.html */
+
+        $format = 'YmdHis';
+
+        if ($tag == FILE_ASN1_TYPE_UTC_TIME) {
+            // https://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf#page=28 says "the seconds
+            // element shall always be present" but none-the-less I've seen X509 certs where it isn't and if the
+            // browsers parse it phpseclib ought to too
+            if (preg_match('#^(\d{10})(Z|[+-]\d{4})$#', $content, $matches)) {
+                $content = $matches[1] . '00' . $matches[2];
+            }
+            $prefix = substr($content, 0, 2) >= 50 ? '19' : '20';
+            $content = $prefix . $content;
+        } elseif (strpos($content, '.') !== false) {
+            $format.= '.u';
+        }
+
+        if ($content[strlen($content) - 1] == 'Z') {
+            $content = substr($content, 0, -1) . '+0000';
+        }
+
+        if (strpos($content, '-') !== false || strpos($content, '+') !== false) {
+            $format.= 'O';
+        }
+
+        // error supression isn't necessary as of PHP 7.0:
+        // http://php.net/manual/en/migration70.other-changes.php
+        return @DateTime::createFromFormat($format, $content);
+    }
+
+    /**
+     * Set the time format
+     *
+     * Sets the time / date format for asn1map().
+     *
+     * @access public
+     * @param string $format
+     */
+    function setTimeFormat($format)
+    {
+        $this->format = $format;
+    }
+
+    /**
+     * Load OIDs
+     *
+     * Load the relevant OIDs for a particular ASN.1 semantic mapping.
+     *
+     * @access public
+     * @param array $oids
+     */
+    function loadOIDs($oids)
+    {
+        $this->oids = $oids;
+    }
+
+    /**
+     * Load filters
+     *
+     * See File_X509, etc, for an example.
+     *
+     * @access public
+     * @param array $filters
+     */
+    function loadFilters($filters)
+    {
+        $this->filters = $filters;
+    }
+
+    /**
+     * String Shift
+     *
+     * Inspired by array_shift
+     *
+     * @param string $string
+     * @param int $index
+     * @return string
+     * @access private
+     */
+    function _string_shift(&$string, $index = 1)
+    {
+        $substr = substr($string, 0, $index);
+        $string = substr($string, $index);
+        return $substr;
+    }
+
+    /**
+     * String type conversion
+     *
+     * This is a lazy conversion, dealing only with character size.
+     * No real conversion table is used.
+     *
+     * @param string $in
+     * @param int $from
+     * @param int $to
+     * @return string
+     * @access public
+     */
+    function convert($in, $from = FILE_ASN1_TYPE_UTF8_STRING, $to = FILE_ASN1_TYPE_UTF8_STRING)
+    {
+        if (!isset($this->stringTypeSize[$from]) || !isset($this->stringTypeSize[$to])) {
+            return false;
+        }
+        $insize = $this->stringTypeSize[$from];
+        $outsize = $this->stringTypeSize[$to];
+        $inlength = strlen($in);
+        $out = '';
+
+        for ($i = 0; $i < $inlength;) {
+            if ($inlength - $i < $insize) {
+                return false;
+            }
+
+            // Get an input character as a 32-bit value.
+            $c = ord($in[$i++]);
+            switch (true) {
+                case $insize == 4:
+                    $c = ($c << 8) | ord($in[$i++]);
+                    $c = ($c << 8) | ord($in[$i++]);
+                case $insize == 2:
+                    $c = ($c << 8) | ord($in[$i++]);
+                case $insize == 1:
+                    break;
+                case ($c & 0x80) == 0x00:
+                    break;
+                case ($c & 0x40) == 0x00:
+                    return false;
+                default:
+                    $bit = 6;
+                    do {
+                        if ($bit > 25 || $i >= $inlength || (ord($in[$i]) & 0xC0) != 0x80) {
+                            return false;
+                        }
+                        $c = ($c << 6) | (ord($in[$i++]) & 0x3F);
+                        $bit += 5;
+                        $mask = 1 << $bit;
+                    } while ($c & $bit);
+                    $c &= $mask - 1;
+                    break;
+            }
+
+            // Convert and append the character to output string.
+            $v = '';
+            switch (true) {
+                case $outsize == 4:
+                    $v .= chr($c & 0xFF);
+                    $c >>= 8;
+                    $v .= chr($c & 0xFF);
+                    $c >>= 8;
+                case $outsize == 2:
+                    $v .= chr($c & 0xFF);
+                    $c >>= 8;
+                case $outsize == 1:
+                    $v .= chr($c & 0xFF);
+                    $c >>= 8;
+                    if ($c) {
+                        return false;
+                    }
+                    break;
+                case ($c & 0x80000000) != 0:
+                    return false;
+                case $c >= 0x04000000:
+                    $v .= chr(0x80 | ($c & 0x3F));
+                    $c = ($c >> 6) | 0x04000000;
+                case $c >= 0x00200000:
+                    $v .= chr(0x80 | ($c & 0x3F));
+                    $c = ($c >> 6) | 0x00200000;
+                case $c >= 0x00010000:
+                    $v .= chr(0x80 | ($c & 0x3F));
+                    $c = ($c >> 6) | 0x00010000;
+                case $c >= 0x00000800:
+                    $v .= chr(0x80 | ($c & 0x3F));
+                    $c = ($c >> 6) | 0x00000800;
+                case $c >= 0x00000080:
+                    $v .= chr(0x80 | ($c & 0x3F));
+                    $c = ($c >> 6) | 0x000000C0;
+                default:
+                    $v .= chr($c);
+                    break;
+            }
+            $out .= strrev($v);
+        }
+        return $out;
+    }
+}
diff --git a/lib/php/phpseclib/File/X509.php b/lib/php/phpseclib/File/X509.php
new file mode 100644
index 00000000..ae38b497
--- /dev/null
+++ b/lib/php/phpseclib/File/X509.php
@@ -0,0 +1,5145 @@
+<?php
+
+/**
+ * Pure-PHP X.509 Parser
+ *
+ * PHP versions 4 and 5
+ *
+ * Encode and decode X.509 certificates.
+ *
+ * The extensions are from {@link http://tools.ietf.org/html/rfc5280 RFC5280} and
+ * {@link http://web.archive.org/web/19961027104704/http://www3.netscape.com/eng/security/cert-exts.html Netscape Certificate Extensions}.
+ *
+ * Note that loading an X.509 certificate and resaving it may invalidate the signature.  The reason being that the signature is based on a
+ * portion of the certificate that contains optional parameters with default values.  ie. if the parameter isn't there the default value is
+ * used.  Problem is, if the parameter is there and it just so happens to have the default value there are two ways that that parameter can
+ * be encoded.  It can be encoded explicitly or left out all together.  This would effect the signature value and thus may invalidate the
+ * the certificate all together unless the certificate is re-signed.
+ *
+ * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @category  File
+ * @package   File_X509
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2012 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+/**
+ * Include File_ASN1
+ */
+if (!class_exists('File_ASN1')) {
+    include_once 'ASN1.php';
+}
+
+/**
+ * Flag to only accept signatures signed by certificate authorities
+ *
+ * Not really used anymore but retained all the same to suppress E_NOTICEs from old installs
+ *
+ * @access public
+ */
+define('FILE_X509_VALIDATE_SIGNATURE_BY_CA', 1);
+
+/**#@+
+ * @access public
+ * @see self::getDN()
+ */
+/**
+ * Return internal array representation
+ */
+define('FILE_X509_DN_ARRAY', 0);
+/**
+ * Return string
+ */
+define('FILE_X509_DN_STRING', 1);
+/**
+ * Return ASN.1 name string
+ */
+define('FILE_X509_DN_ASN1', 2);
+/**
+ * Return OpenSSL compatible array
+ */
+define('FILE_X509_DN_OPENSSL', 3);
+/**
+ * Return canonical ASN.1 RDNs string
+ */
+define('FILE_X509_DN_CANON', 4);
+/**
+ * Return name hash for file indexing
+ */
+define('FILE_X509_DN_HASH', 5);
+/**#@-*/
+
+/**#@+
+ * @access public
+ * @see self::saveX509()
+ * @see self::saveCSR()
+ * @see self::saveCRL()
+ */
+/**
+ * Save as PEM
+ *
+ * ie. a base64-encoded PEM with a header and a footer
+ */
+define('FILE_X509_FORMAT_PEM', 0);
+/**
+ * Save as DER
+ */
+define('FILE_X509_FORMAT_DER', 1);
+/**
+ * Save as a SPKAC
+ *
+ * Only works on CSRs. Not currently supported.
+ */
+define('FILE_X509_FORMAT_SPKAC', 2);
+/**
+ * Auto-detect the format
+ *
+ * Used only by the load*() functions
+ */
+define('FILE_X509_FORMAT_AUTO_DETECT', 3);
+/**#@-*/
+
+/**
+ * Attribute value disposition.
+ * If disposition is >= 0, this is the index of the target value.
+ */
+define('FILE_X509_ATTR_ALL', -1); // All attribute values (array).
+define('FILE_X509_ATTR_APPEND', -2); // Add a value.
+define('FILE_X509_ATTR_REPLACE', -3); // Clear first, then add a value.
+
+/**
+ * Pure-PHP X.509 Parser
+ *
+ * @package File_X509
+ * @author  Jim Wigginton <terrafrost@php.net>
+ * @access  public
+ */
+class File_X509
+{
+    /**
+     * ASN.1 syntax for X.509 certificates
+     *
+     * @var array
+     * @access private
+     */
+    var $Certificate;
+
+    /**#@+
+     * ASN.1 syntax for various extensions
+     *
+     * @access private
+     */
+    var $DirectoryString;
+    var $PKCS9String;
+    var $AttributeValue;
+    var $Extensions;
+    var $KeyUsage;
+    var $ExtKeyUsageSyntax;
+    var $BasicConstraints;
+    var $KeyIdentifier;
+    var $CRLDistributionPoints;
+    var $AuthorityKeyIdentifier;
+    var $CertificatePolicies;
+    var $AuthorityInfoAccessSyntax;
+    var $SubjectAltName;
+    var $SubjectDirectoryAttributes;
+    var $PrivateKeyUsagePeriod;
+    var $IssuerAltName;
+    var $PolicyMappings;
+    var $NameConstraints;
+
+    var $CPSuri;
+    var $UserNotice;
+
+    var $netscape_cert_type;
+    var $netscape_comment;
+    var $netscape_ca_policy_url;
+
+    var $Name;
+    var $RelativeDistinguishedName;
+    var $CRLNumber;
+    var $CRLReason;
+    var $IssuingDistributionPoint;
+    var $InvalidityDate;
+    var $CertificateIssuer;
+    var $HoldInstructionCode;
+    var $SignedPublicKeyAndChallenge;
+    /**#@-*/
+
+    /**#@+
+     * ASN.1 syntax for various DN attributes
+     *
+     * @access private
+     */
+    var $PostalAddress;
+    /**#@-*/
+
+    /**
+     * ASN.1 syntax for Certificate Signing Requests (RFC2986)
+     *
+     * @var array
+     * @access private
+     */
+    var $CertificationRequest;
+
+    /**
+     * ASN.1 syntax for Certificate Revocation Lists (RFC5280)
+     *
+     * @var array
+     * @access private
+     */
+    var $CertificateList;
+
+    /**
+     * Distinguished Name
+     *
+     * @var array
+     * @access private
+     */
+    var $dn;
+
+    /**
+     * Public key
+     *
+     * @var string
+     * @access private
+     */
+    var $publicKey;
+
+    /**
+     * Private key
+     *
+     * @var string
+     * @access private
+     */
+    var $privateKey;
+
+    /**
+     * Object identifiers for X.509 certificates
+     *
+     * @var array
+     * @access private
+     * @link http://en.wikipedia.org/wiki/Object_identifier
+     */
+    var $oids;
+
+    /**
+     * The certificate authorities
+     *
+     * @var array
+     * @access private
+     */
+    var $CAs;
+
+    /**
+     * The currently loaded certificate
+     *
+     * @var array
+     * @access private
+     */
+    var $currentCert;
+
+    /**
+     * The signature subject
+     *
+     * There's no guarantee File_X509 is going to re-encode an X.509 cert in the same way it was originally
+     * encoded so we take save the portion of the original cert that the signature would have made for.
+     *
+     * @var string
+     * @access private
+     */
+    var $signatureSubject;
+
+    /**
+     * Certificate Start Date
+     *
+     * @var string
+     * @access private
+     */
+    var $startDate;
+
+    /**
+     * Certificate End Date
+     *
+     * @var string
+     * @access private
+     */
+    var $endDate;
+
+    /**
+     * Serial Number
+     *
+     * @var string
+     * @access private
+     */
+    var $serialNumber;
+
+    /**
+     * Key Identifier
+     *
+     * See {@link http://tools.ietf.org/html/rfc5280#section-4.2.1.1 RFC5280#section-4.2.1.1} and
+     * {@link http://tools.ietf.org/html/rfc5280#section-4.2.1.2 RFC5280#section-4.2.1.2}.
+     *
+     * @var string
+     * @access private
+     */
+    var $currentKeyIdentifier;
+
+    /**
+     * CA Flag
+     *
+     * @var bool
+     * @access private
+     */
+    var $caFlag = false;
+
+    /**
+     * SPKAC Challenge
+     *
+     * @var string
+     * @access private
+     */
+    var $challenge;
+
+    /**
+     * Recursion Limit
+     *
+     * @var int
+     * @access private
+     */
+    var $recur_limit = 5;
+
+    /**
+     * URL fetch flag
+     *
+     * @var bool
+     * @access private
+     */
+    var $disable_url_fetch = false;
+
+    /**
+     * Default Constructor.
+     *
+     * @return File_X509
+     * @access public
+     */
+    function __construct()
+    {
+        if (!class_exists('Math_BigInteger')) {
+            include_once 'Math/BigInteger.php';
+        }
+
+        // Explicitly Tagged Module, 1988 Syntax
+        // http://tools.ietf.org/html/rfc5280#appendix-A.1
+
+        $this->DirectoryString = array(
+            'type'     => FILE_ASN1_TYPE_CHOICE,
+            'children' => array(
+                'teletexString'   => array('type' => FILE_ASN1_TYPE_TELETEX_STRING),
+                'printableString' => array('type' => FILE_ASN1_TYPE_PRINTABLE_STRING),
+                'universalString' => array('type' => FILE_ASN1_TYPE_UNIVERSAL_STRING),
+                'utf8String'      => array('type' => FILE_ASN1_TYPE_UTF8_STRING),
+                'bmpString'       => array('type' => FILE_ASN1_TYPE_BMP_STRING)
+            )
+        );
+
+        $this->PKCS9String = array(
+            'type'     => FILE_ASN1_TYPE_CHOICE,
+            'children' => array(
+                'ia5String'       => array('type' => FILE_ASN1_TYPE_IA5_STRING),
+                'directoryString' => $this->DirectoryString
+            )
+        );
+
+        $this->AttributeValue = array('type' => FILE_ASN1_TYPE_ANY);
+
+        $AttributeType = array('type' => FILE_ASN1_TYPE_OBJECT_IDENTIFIER);
+
+        $AttributeTypeAndValue = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'children' => array(
+                'type' => $AttributeType,
+                'value'=> $this->AttributeValue
+            )
+        );
+
+        /*
+        In practice, RDNs containing multiple name-value pairs (called "multivalued RDNs") are rare,
+        but they can be useful at times when either there is no unique attribute in the entry or you
+        want to ensure that the entry's DN contains some useful identifying information.
+
+        - https://www.opends.org/wiki/page/DefinitionRelativeDistinguishedName
+        */
+        $this->RelativeDistinguishedName = array(
+            'type'     => FILE_ASN1_TYPE_SET,
+            'min'      => 1,
+            'max'      => -1,
+            'children' => $AttributeTypeAndValue
+        );
+
+        // http://tools.ietf.org/html/rfc5280#section-4.1.2.4
+        $RDNSequence = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            // RDNSequence does not define a min or a max, which means it doesn't have one
+            'min'      => 0,
+            'max'      => -1,
+            'children' => $this->RelativeDistinguishedName
+        );
+
+        $this->Name = array(
+            'type'     => FILE_ASN1_TYPE_CHOICE,
+            'children' => array(
+                'rdnSequence' => $RDNSequence
+            )
+        );
+
+        // http://tools.ietf.org/html/rfc5280#section-4.1.1.2
+        $AlgorithmIdentifier = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'children' => array(
+                'algorithm'  => array('type' => FILE_ASN1_TYPE_OBJECT_IDENTIFIER),
+                'parameters' => array(
+                                    'type'     => FILE_ASN1_TYPE_ANY,
+                                    'optional' => true
+                                )
+            )
+        );
+
+        /*
+           A certificate using system MUST reject the certificate if it encounters
+           a critical extension it does not recognize; however, a non-critical
+           extension may be ignored if it is not recognized.
+
+           http://tools.ietf.org/html/rfc5280#section-4.2
+        */
+        $Extension = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'children' => array(
+                'extnId'   => array('type' => FILE_ASN1_TYPE_OBJECT_IDENTIFIER),
+                'critical' => array(
+                                  'type'     => FILE_ASN1_TYPE_BOOLEAN,
+                                  'optional' => true,
+                                  'default'  => false
+                              ),
+                'extnValue' => array('type' => FILE_ASN1_TYPE_OCTET_STRING)
+            )
+        );
+
+        $this->Extensions = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'min'      => 1,
+            // technically, it's MAX, but we'll assume anything < 0 is MAX
+            'max'      => -1,
+            // if 'children' isn't an array then 'min' and 'max' must be defined
+            'children' => $Extension
+        );
+
+        $SubjectPublicKeyInfo = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'children' => array(
+                'algorithm'        => $AlgorithmIdentifier,
+                'subjectPublicKey' => array('type' => FILE_ASN1_TYPE_BIT_STRING)
+            )
+        );
+
+        $UniqueIdentifier = array('type' => FILE_ASN1_TYPE_BIT_STRING);
+
+        $Time = array(
+            'type'     => FILE_ASN1_TYPE_CHOICE,
+            'children' => array(
+                'utcTime'     => array('type' => FILE_ASN1_TYPE_UTC_TIME),
+                'generalTime' => array('type' => FILE_ASN1_TYPE_GENERALIZED_TIME)
+            )
+        );
+
+        // http://tools.ietf.org/html/rfc5280#section-4.1.2.5
+        $Validity = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'children' => array(
+                'notBefore' => $Time,
+                'notAfter'  => $Time
+            )
+        );
+
+        $CertificateSerialNumber = array('type' => FILE_ASN1_TYPE_INTEGER);
+
+        $Version = array(
+            'type'    => FILE_ASN1_TYPE_INTEGER,
+            'mapping' => array('v1', 'v2', 'v3')
+        );
+
+        // assert($TBSCertificate['children']['signature'] == $Certificate['children']['signatureAlgorithm'])
+        $TBSCertificate = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'children' => array(
+                // technically, default implies optional, but we'll define it as being optional, none-the-less, just to
+                // reenforce that fact
+                'version'             => array(
+                                             'constant' => 0,
+                                             'optional' => true,
+                                             'explicit' => true,
+                                             'default'  => 'v1'
+                                         ) + $Version,
+                'serialNumber'         => $CertificateSerialNumber,
+                'signature'            => $AlgorithmIdentifier,
+                'issuer'               => $this->Name,
+                'validity'             => $Validity,
+                'subject'              => $this->Name,
+                'subjectPublicKeyInfo' => $SubjectPublicKeyInfo,
+                // implicit means that the T in the TLV structure is to be rewritten, regardless of the type
+                'issuerUniqueID'       => array(
+                                               'constant' => 1,
+                                               'optional' => true,
+                                               'implicit' => true
+                                           ) + $UniqueIdentifier,
+                'subjectUniqueID'       => array(
+                                               'constant' => 2,
+                                               'optional' => true,
+                                               'implicit' => true
+                                           ) + $UniqueIdentifier,
+                // <http://tools.ietf.org/html/rfc2459#page-74> doesn't use the EXPLICIT keyword but if
+                // it's not IMPLICIT, it's EXPLICIT
+                'extensions'            => array(
+                                               'constant' => 3,
+                                               'optional' => true,
+                                               'explicit' => true
+                                           ) + $this->Extensions
+            )
+        );
+
+        $this->Certificate = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'children' => array(
+                 'tbsCertificate'     => $TBSCertificate,
+                 'signatureAlgorithm' => $AlgorithmIdentifier,
+                 'signature'          => array('type' => FILE_ASN1_TYPE_BIT_STRING)
+            )
+        );
+
+        $this->KeyUsage = array(
+            'type'    => FILE_ASN1_TYPE_BIT_STRING,
+            'mapping' => array(
+                'digitalSignature',
+                'nonRepudiation',
+                'keyEncipherment',
+                'dataEncipherment',
+                'keyAgreement',
+                'keyCertSign',
+                'cRLSign',
+                'encipherOnly',
+                'decipherOnly'
+            )
+        );
+
+        $this->BasicConstraints = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'children' => array(
+                'cA'                => array(
+                                                 'type'     => FILE_ASN1_TYPE_BOOLEAN,
+                                                 'optional' => true,
+                                                 'default'  => false
+                                       ),
+                'pathLenConstraint' => array(
+                                                 'type' => FILE_ASN1_TYPE_INTEGER,
+                                                 'optional' => true
+                                       )
+            )
+        );
+
+        $this->KeyIdentifier = array('type' => FILE_ASN1_TYPE_OCTET_STRING);
+
+        $OrganizationalUnitNames = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'min'      => 1,
+            'max'      => 4, // ub-organizational-units
+            'children' => array('type' => FILE_ASN1_TYPE_PRINTABLE_STRING)
+        );
+
+        $PersonalName = array(
+            'type'     => FILE_ASN1_TYPE_SET,
+            'children' => array(
+                'surname'              => array(
+                                           'type' => FILE_ASN1_TYPE_PRINTABLE_STRING,
+                                           'constant' => 0,
+                                           'optional' => true,
+                                           'implicit' => true
+                                         ),
+                'given-name'           => array(
+                                           'type' => FILE_ASN1_TYPE_PRINTABLE_STRING,
+                                           'constant' => 1,
+                                           'optional' => true,
+                                           'implicit' => true
+                                         ),
+                'initials'             => array(
+                                           'type' => FILE_ASN1_TYPE_PRINTABLE_STRING,
+                                           'constant' => 2,
+                                           'optional' => true,
+                                           'implicit' => true
+                                         ),
+                'generation-qualifier' => array(
+                                           'type' => FILE_ASN1_TYPE_PRINTABLE_STRING,
+                                           'constant' => 3,
+                                           'optional' => true,
+                                           'implicit' => true
+                                         )
+            )
+        );
+
+        $NumericUserIdentifier = array('type' => FILE_ASN1_TYPE_NUMERIC_STRING);
+
+        $OrganizationName = array('type' => FILE_ASN1_TYPE_PRINTABLE_STRING);
+
+        $PrivateDomainName = array(
+            'type'     => FILE_ASN1_TYPE_CHOICE,
+            'children' => array(
+                'numeric'   => array('type' => FILE_ASN1_TYPE_NUMERIC_STRING),
+                'printable' => array('type' => FILE_ASN1_TYPE_PRINTABLE_STRING)
+            )
+        );
+
+        $TerminalIdentifier = array('type' => FILE_ASN1_TYPE_PRINTABLE_STRING);
+
+        $NetworkAddress = array('type' => FILE_ASN1_TYPE_NUMERIC_STRING);
+
+        $AdministrationDomainName = array(
+            'type'     => FILE_ASN1_TYPE_CHOICE,
+            // if class isn't present it's assumed to be FILE_ASN1_CLASS_UNIVERSAL or
+            // (if constant is present) FILE_ASN1_CLASS_CONTEXT_SPECIFIC
+            'class'    => FILE_ASN1_CLASS_APPLICATION,
+            'cast'     => 2,
+            'children' => array(
+                'numeric'   => array('type' => FILE_ASN1_TYPE_NUMERIC_STRING),
+                'printable' => array('type' => FILE_ASN1_TYPE_PRINTABLE_STRING)
+            )
+        );
+
+        $CountryName = array(
+            'type'     => FILE_ASN1_TYPE_CHOICE,
+            // if class isn't present it's assumed to be FILE_ASN1_CLASS_UNIVERSAL or
+            // (if constant is present) FILE_ASN1_CLASS_CONTEXT_SPECIFIC
+            'class'    => FILE_ASN1_CLASS_APPLICATION,
+            'cast'     => 1,
+            'children' => array(
+                'x121-dcc-code'        => array('type' => FILE_ASN1_TYPE_NUMERIC_STRING),
+                'iso-3166-alpha2-code' => array('type' => FILE_ASN1_TYPE_PRINTABLE_STRING)
+            )
+        );
+
+        $AnotherName = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'children' => array(
+                 'type-id' => array('type' => FILE_ASN1_TYPE_OBJECT_IDENTIFIER),
+                 'value'   => array(
+                                  'type' => FILE_ASN1_TYPE_ANY,
+                                  'constant' => 0,
+                                  'optional' => true,
+                                  'explicit' => true
+                              )
+            )
+        );
+
+        $ExtensionAttribute = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'children' => array(
+                 'extension-attribute-type'  => array(
+                                                    'type' => FILE_ASN1_TYPE_PRINTABLE_STRING,
+                                                    'constant' => 0,
+                                                    'optional' => true,
+                                                    'implicit' => true
+                                                ),
+                 'extension-attribute-value' => array(
+                                                    'type' => FILE_ASN1_TYPE_ANY,
+                                                    'constant' => 1,
+                                                    'optional' => true,
+                                                    'explicit' => true
+                                                )
+            )
+        );
+
+        $ExtensionAttributes = array(
+            'type'     => FILE_ASN1_TYPE_SET,
+            'min'      => 1,
+            'max'      => 256, // ub-extension-attributes
+            'children' => $ExtensionAttribute
+        );
+
+        $BuiltInDomainDefinedAttribute = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'children' => array(
+                 'type'  => array('type' => FILE_ASN1_TYPE_PRINTABLE_STRING),
+                 'value' => array('type' => FILE_ASN1_TYPE_PRINTABLE_STRING)
+            )
+        );
+
+        $BuiltInDomainDefinedAttributes = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'min'      => 1,
+            'max'      => 4, // ub-domain-defined-attributes
+            'children' => $BuiltInDomainDefinedAttribute
+        );
+
+        $BuiltInStandardAttributes =  array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'children' => array(
+                'country-name'               => array('optional' => true) + $CountryName,
+                'administration-domain-name' => array('optional' => true) + $AdministrationDomainName,
+                'network-address'            => array(
+                                                 'constant' => 0,
+                                                 'optional' => true,
+                                                 'implicit' => true
+                                               ) + $NetworkAddress,
+                'terminal-identifier'        => array(
+                                                 'constant' => 1,
+                                                 'optional' => true,
+                                                 'implicit' => true
+                                               ) + $TerminalIdentifier,
+                'private-domain-name'        => array(
+                                                 'constant' => 2,
+                                                 'optional' => true,
+                                                 'explicit' => true
+                                               ) + $PrivateDomainName,
+                'organization-name'          => array(
+                                                 'constant' => 3,
+                                                 'optional' => true,
+                                                 'implicit' => true
+                                               ) + $OrganizationName,
+                'numeric-user-identifier'    => array(
+                                                 'constant' => 4,
+                                                 'optional' => true,
+                                                 'implicit' => true
+                                               ) + $NumericUserIdentifier,
+                'personal-name'              => array(
+                                                 'constant' => 5,
+                                                 'optional' => true,
+                                                 'implicit' => true
+                                               ) + $PersonalName,
+                'organizational-unit-names'  => array(
+                                                 'constant' => 6,
+                                                 'optional' => true,
+                                                 'implicit' => true
+                                               ) + $OrganizationalUnitNames
+            )
+        );
+
+        $ORAddress = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'children' => array(
+                 'built-in-standard-attributes'       => $BuiltInStandardAttributes,
+                 'built-in-domain-defined-attributes' => array('optional' => true) + $BuiltInDomainDefinedAttributes,
+                 'extension-attributes'               => array('optional' => true) + $ExtensionAttributes
+            )
+        );
+
+        $EDIPartyName = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'children' => array(
+                 'nameAssigner' => array(
+                                    'constant' => 0,
+                                    'optional' => true,
+                                    'implicit' => true
+                                ) + $this->DirectoryString,
+                 // partyName is technically required but File_ASN1 doesn't currently support non-optional constants and
+                 // setting it to optional gets the job done in any event.
+                 'partyName'    => array(
+                                    'constant' => 1,
+                                    'optional' => true,
+                                    'implicit' => true
+                                ) + $this->DirectoryString
+            )
+        );
+
+        $GeneralName = array(
+            'type'     => FILE_ASN1_TYPE_CHOICE,
+            'children' => array(
+                'otherName'                 => array(
+                                                 'constant' => 0,
+                                                 'optional' => true,
+                                                 'implicit' => true
+                                               ) + $AnotherName,
+                'rfc822Name'                => array(
+                                                 'type' => FILE_ASN1_TYPE_IA5_STRING,
+                                                 'constant' => 1,
+                                                 'optional' => true,
+                                                 'implicit' => true
+                                               ),
+                'dNSName'                   => array(
+                                                 'type' => FILE_ASN1_TYPE_IA5_STRING,
+                                                 'constant' => 2,
+                                                 'optional' => true,
+                                                 'implicit' => true
+                                               ),
+                'x400Address'               => array(
+                                                 'constant' => 3,
+                                                 'optional' => true,
+                                                 'implicit' => true
+                                               ) + $ORAddress,
+                'directoryName'             => array(
+                                                 'constant' => 4,
+                                                 'optional' => true,
+                                                 'explicit' => true
+                                               ) + $this->Name,
+                'ediPartyName'              => array(
+                                                 'constant' => 5,
+                                                 'optional' => true,
+                                                 'implicit' => true
+                                               ) + $EDIPartyName,
+                'uniformResourceIdentifier' => array(
+                                                 'type' => FILE_ASN1_TYPE_IA5_STRING,
+                                                 'constant' => 6,
+                                                 'optional' => true,
+                                                 'implicit' => true
+                                               ),
+                'iPAddress'                 => array(
+                                                 'type' => FILE_ASN1_TYPE_OCTET_STRING,
+                                                 'constant' => 7,
+                                                 'optional' => true,
+                                                 'implicit' => true
+                                               ),
+                'registeredID'              => array(
+                                                 'type' => FILE_ASN1_TYPE_OBJECT_IDENTIFIER,
+                                                 'constant' => 8,
+                                                 'optional' => true,
+                                                 'implicit' => true
+                                               )
+            )
+        );
+
+        $GeneralNames = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'min'      => 1,
+            'max'      => -1,
+            'children' => $GeneralName
+        );
+
+        $this->IssuerAltName = $GeneralNames;
+
+        $ReasonFlags = array(
+            'type'    => FILE_ASN1_TYPE_BIT_STRING,
+            'mapping' => array(
+                'unused',
+                'keyCompromise',
+                'cACompromise',
+                'affiliationChanged',
+                'superseded',
+                'cessationOfOperation',
+                'certificateHold',
+                'privilegeWithdrawn',
+                'aACompromise'
+            )
+        );
+
+        $DistributionPointName = array(
+            'type'     => FILE_ASN1_TYPE_CHOICE,
+            'children' => array(
+                'fullName'                => array(
+                                                 'constant' => 0,
+                                                 'optional' => true,
+                                                 'implicit' => true
+                                       ) + $GeneralNames,
+                'nameRelativeToCRLIssuer' => array(
+                                                 'constant' => 1,
+                                                 'optional' => true,
+                                                 'implicit' => true
+                                       ) + $this->RelativeDistinguishedName
+            )
+        );
+
+        $DistributionPoint = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'children' => array(
+                'distributionPoint' => array(
+                                                 'constant' => 0,
+                                                 'optional' => true,
+                                                 'explicit' => true
+                                       ) + $DistributionPointName,
+                'reasons'           => array(
+                                                 'constant' => 1,
+                                                 'optional' => true,
+                                                 'implicit' => true
+                                       ) + $ReasonFlags,
+                'cRLIssuer'         => array(
+                                                 'constant' => 2,
+                                                 'optional' => true,
+                                                 'implicit' => true
+                                       ) + $GeneralNames
+            )
+        );
+
+        $this->CRLDistributionPoints = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'min'      => 1,
+            'max'      => -1,
+            'children' => $DistributionPoint
+        );
+
+        $this->AuthorityKeyIdentifier = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'children' => array(
+                'keyIdentifier'             => array(
+                                                 'constant' => 0,
+                                                 'optional' => true,
+                                                 'implicit' => true
+                                               ) + $this->KeyIdentifier,
+                'authorityCertIssuer'       => array(
+                                                 'constant' => 1,
+                                                 'optional' => true,
+                                                 'implicit' => true
+                                               ) + $GeneralNames,
+                'authorityCertSerialNumber' => array(
+                                                 'constant' => 2,
+                                                 'optional' => true,
+                                                 'implicit' => true
+                                               ) + $CertificateSerialNumber
+            )
+        );
+
+        $PolicyQualifierId = array('type' => FILE_ASN1_TYPE_OBJECT_IDENTIFIER);
+
+        $PolicyQualifierInfo = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'children' => array(
+                'policyQualifierId' => $PolicyQualifierId,
+                'qualifier'         => array('type' => FILE_ASN1_TYPE_ANY)
+            )
+        );
+
+        $CertPolicyId = array('type' => FILE_ASN1_TYPE_OBJECT_IDENTIFIER);
+
+        $PolicyInformation = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'children' => array(
+                'policyIdentifier' => $CertPolicyId,
+                'policyQualifiers' => array(
+                                          'type'     => FILE_ASN1_TYPE_SEQUENCE,
+                                          'min'      => 0,
+                                          'max'      => -1,
+                                          'optional' => true,
+                                          'children' => $PolicyQualifierInfo
+                                      )
+            )
+        );
+
+        $this->CertificatePolicies = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'min'      => 1,
+            'max'      => -1,
+            'children' => $PolicyInformation
+        );
+
+        $this->PolicyMappings = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'min'      => 1,
+            'max'      => -1,
+            'children' => array(
+                              'type'     => FILE_ASN1_TYPE_SEQUENCE,
+                              'children' => array(
+                                  'issuerDomainPolicy' => $CertPolicyId,
+                                  'subjectDomainPolicy' => $CertPolicyId
+                              )
+                       )
+        );
+
+        $KeyPurposeId = array('type' => FILE_ASN1_TYPE_OBJECT_IDENTIFIER);
+
+        $this->ExtKeyUsageSyntax = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'min'      => 1,
+            'max'      => -1,
+            'children' => $KeyPurposeId
+        );
+
+        $AccessDescription = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'children' => array(
+                'accessMethod'   => array('type' => FILE_ASN1_TYPE_OBJECT_IDENTIFIER),
+                'accessLocation' => $GeneralName
+            )
+        );
+
+        $this->AuthorityInfoAccessSyntax = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'min'      => 1,
+            'max'      => -1,
+            'children' => $AccessDescription
+        );
+
+        $this->SubjectAltName = $GeneralNames;
+
+        $this->PrivateKeyUsagePeriod = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'children' => array(
+                'notBefore' => array(
+                                                 'constant' => 0,
+                                                 'optional' => true,
+                                                 'implicit' => true,
+                                                 'type' => FILE_ASN1_TYPE_GENERALIZED_TIME),
+                'notAfter'  => array(
+                                                 'constant' => 1,
+                                                 'optional' => true,
+                                                 'implicit' => true,
+                                                 'type' => FILE_ASN1_TYPE_GENERALIZED_TIME)
+            )
+        );
+
+        $BaseDistance = array('type' => FILE_ASN1_TYPE_INTEGER);
+
+        $GeneralSubtree = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'children' => array(
+                'base'    => $GeneralName,
+                'minimum' => array(
+                                 'constant' => 0,
+                                 'optional' => true,
+                                 'implicit' => true,
+                                 'default' => new Math_BigInteger(0)
+                             ) + $BaseDistance,
+                'maximum' => array(
+                                 'constant' => 1,
+                                 'optional' => true,
+                                 'implicit' => true,
+                             ) + $BaseDistance
+            )
+        );
+
+        $GeneralSubtrees = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'min'      => 1,
+            'max'      => -1,
+            'children' => $GeneralSubtree
+        );
+
+        $this->NameConstraints = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'children' => array(
+                'permittedSubtrees' => array(
+                                           'constant' => 0,
+                                           'optional' => true,
+                                           'implicit' => true
+                                       ) + $GeneralSubtrees,
+                'excludedSubtrees'  => array(
+                                           'constant' => 1,
+                                           'optional' => true,
+                                           'implicit' => true
+                                       ) + $GeneralSubtrees
+            )
+        );
+
+        $this->CPSuri = array('type' => FILE_ASN1_TYPE_IA5_STRING);
+
+        $DisplayText = array(
+            'type'     => FILE_ASN1_TYPE_CHOICE,
+            'children' => array(
+                'ia5String'     => array('type' => FILE_ASN1_TYPE_IA5_STRING),
+                'visibleString' => array('type' => FILE_ASN1_TYPE_VISIBLE_STRING),
+                'bmpString'     => array('type' => FILE_ASN1_TYPE_BMP_STRING),
+                'utf8String'    => array('type' => FILE_ASN1_TYPE_UTF8_STRING)
+            )
+        );
+
+        $NoticeReference = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'children' => array(
+                'organization'  => $DisplayText,
+                'noticeNumbers' => array(
+                                       'type'     => FILE_ASN1_TYPE_SEQUENCE,
+                                       'min'      => 1,
+                                       'max'      => 200,
+                                       'children' => array('type' => FILE_ASN1_TYPE_INTEGER)
+                                   )
+            )
+        );
+
+        $this->UserNotice = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'children' => array(
+                'noticeRef' => array(
+                                           'optional' => true,
+                                           'implicit' => true
+                                       ) + $NoticeReference,
+                'explicitText'  => array(
+                                           'optional' => true,
+                                           'implicit' => true
+                                       ) + $DisplayText
+            )
+        );
+
+        // mapping is from <http://www.mozilla.org/projects/security/pki/nss/tech-notes/tn3.html>
+        $this->netscape_cert_type = array(
+            'type'    => FILE_ASN1_TYPE_BIT_STRING,
+            'mapping' => array(
+                'SSLClient',
+                'SSLServer',
+                'Email',
+                'ObjectSigning',
+                'Reserved',
+                'SSLCA',
+                'EmailCA',
+                'ObjectSigningCA'
+            )
+        );
+
+        $this->netscape_comment = array('type' => FILE_ASN1_TYPE_IA5_STRING);
+        $this->netscape_ca_policy_url = array('type' => FILE_ASN1_TYPE_IA5_STRING);
+
+        // attribute is used in RFC2986 but we're using the RFC5280 definition
+
+        $Attribute = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'children' => array(
+                'type' => $AttributeType,
+                'value'=> array(
+                              'type'     => FILE_ASN1_TYPE_SET,
+                              'min'      => 1,
+                              'max'      => -1,
+                              'children' => $this->AttributeValue
+                          )
+            )
+        );
+
+        $this->SubjectDirectoryAttributes = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'min'      => 1,
+            'max'      => -1,
+            'children' => $Attribute
+        );
+
+        // adapted from <http://tools.ietf.org/html/rfc2986>
+
+        $Attributes = array(
+            'type'     => FILE_ASN1_TYPE_SET,
+            'min'      => 1,
+            'max'      => -1,
+            'children' => $Attribute
+        );
+
+        $CertificationRequestInfo = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'children' => array(
+                'version'       => array(
+                                       'type' => FILE_ASN1_TYPE_INTEGER,
+                                       'mapping' => array('v1')
+                                   ),
+                'subject'       => $this->Name,
+                'subjectPKInfo' => $SubjectPublicKeyInfo,
+                'attributes'    => array(
+                                       'constant' => 0,
+                                       'optional' => true,
+                                       'implicit' => true
+                                   ) + $Attributes,
+            )
+        );
+
+        $this->CertificationRequest = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'children' => array(
+                'certificationRequestInfo' => $CertificationRequestInfo,
+                'signatureAlgorithm'       => $AlgorithmIdentifier,
+                'signature'                => array('type' => FILE_ASN1_TYPE_BIT_STRING)
+            )
+        );
+
+        $RevokedCertificate = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'children' => array(
+                              'userCertificate'    => $CertificateSerialNumber,
+                              'revocationDate'     => $Time,
+                              'crlEntryExtensions' => array(
+                                                          'optional' => true
+                                                      ) + $this->Extensions
+                          )
+        );
+
+        $TBSCertList = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'children' => array(
+                'version'             => array(
+                                             'optional' => true,
+                                             'default'  => 'v1'
+                                         ) + $Version,
+                'signature'           => $AlgorithmIdentifier,
+                'issuer'              => $this->Name,
+                'thisUpdate'          => $Time,
+                'nextUpdate'          => array(
+                                             'optional' => true
+                                         ) + $Time,
+                'revokedCertificates' => array(
+                                             'type'     => FILE_ASN1_TYPE_SEQUENCE,
+                                             'optional' => true,
+                                             'min'      => 0,
+                                             'max'      => -1,
+                                             'children' => $RevokedCertificate
+                                         ),
+                'crlExtensions'       => array(
+                                             'constant' => 0,
+                                             'optional' => true,
+                                             'explicit' => true
+                                         ) + $this->Extensions
+            )
+        );
+
+        $this->CertificateList = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'children' => array(
+                'tbsCertList'        => $TBSCertList,
+                'signatureAlgorithm' => $AlgorithmIdentifier,
+                'signature'          => array('type' => FILE_ASN1_TYPE_BIT_STRING)
+            )
+        );
+
+        $this->CRLNumber = array('type' => FILE_ASN1_TYPE_INTEGER);
+
+        $this->CRLReason = array('type' => FILE_ASN1_TYPE_ENUMERATED,
+           'mapping' => array(
+                            'unspecified',
+                            'keyCompromise',
+                            'cACompromise',
+                            'affiliationChanged',
+                            'superseded',
+                            'cessationOfOperation',
+                            'certificateHold',
+                            // Value 7 is not used.
+                            8 => 'removeFromCRL',
+                            'privilegeWithdrawn',
+                            'aACompromise'
+            )
+        );
+
+        $this->IssuingDistributionPoint = array('type' => FILE_ASN1_TYPE_SEQUENCE,
+            'children' => array(
+                'distributionPoint'          => array(
+                                                    'constant' => 0,
+                                                    'optional' => true,
+                                                    'explicit' => true
+                                                ) + $DistributionPointName,
+                'onlyContainsUserCerts'      => array(
+                                                    'type'     => FILE_ASN1_TYPE_BOOLEAN,
+                                                    'constant' => 1,
+                                                    'optional' => true,
+                                                    'default'  => false,
+                                                    'implicit' => true
+                                                ),
+                'onlyContainsCACerts'        => array(
+                                                    'type'     => FILE_ASN1_TYPE_BOOLEAN,
+                                                    'constant' => 2,
+                                                    'optional' => true,
+                                                    'default'  => false,
+                                                    'implicit' => true
+                                                ),
+                'onlySomeReasons'           => array(
+                                                    'constant' => 3,
+                                                    'optional' => true,
+                                                    'implicit' => true
+                                                ) + $ReasonFlags,
+                'indirectCRL'               => array(
+                                                    'type'     => FILE_ASN1_TYPE_BOOLEAN,
+                                                    'constant' => 4,
+                                                    'optional' => true,
+                                                    'default'  => false,
+                                                    'implicit' => true
+                                                ),
+                'onlyContainsAttributeCerts' => array(
+                                                    'type'     => FILE_ASN1_TYPE_BOOLEAN,
+                                                    'constant' => 5,
+                                                    'optional' => true,
+                                                    'default'  => false,
+                                                    'implicit' => true
+                                                )
+                          )
+        );
+
+        $this->InvalidityDate = array('type' => FILE_ASN1_TYPE_GENERALIZED_TIME);
+
+        $this->CertificateIssuer = $GeneralNames;
+
+        $this->HoldInstructionCode = array('type' => FILE_ASN1_TYPE_OBJECT_IDENTIFIER);
+
+        $PublicKeyAndChallenge = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'children' => array(
+                'spki'      => $SubjectPublicKeyInfo,
+                'challenge' => array('type' => FILE_ASN1_TYPE_IA5_STRING)
+            )
+        );
+
+        $this->SignedPublicKeyAndChallenge = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'children' => array(
+                'publicKeyAndChallenge' => $PublicKeyAndChallenge,
+                'signatureAlgorithm'    => $AlgorithmIdentifier,
+                'signature'             => array('type' => FILE_ASN1_TYPE_BIT_STRING)
+            )
+        );
+
+        $this->PostalAddress = array(
+            'type'     => FILE_ASN1_TYPE_SEQUENCE,
+            'optional' => true,
+            'min'      => 1,
+            'max'      => -1,
+            'children' => $this->DirectoryString
+        );
+
+        // OIDs from RFC5280 and those RFCs mentioned in RFC5280#section-4.1.1.2
+        $this->oids = array(
+            '1.3.6.1.5.5.7' => 'id-pkix',
+            '1.3.6.1.5.5.7.1' => 'id-pe',
+            '1.3.6.1.5.5.7.2' => 'id-qt',
+            '1.3.6.1.5.5.7.3' => 'id-kp',
+            '1.3.6.1.5.5.7.48' => 'id-ad',
+            '1.3.6.1.5.5.7.2.1' => 'id-qt-cps',
+            '1.3.6.1.5.5.7.2.2' => 'id-qt-unotice',
+            '1.3.6.1.5.5.7.48.1' =>'id-ad-ocsp',
+            '1.3.6.1.5.5.7.48.2' => 'id-ad-caIssuers',
+            '1.3.6.1.5.5.7.48.3' => 'id-ad-timeStamping',
+            '1.3.6.1.5.5.7.48.5' => 'id-ad-caRepository',
+            '2.5.4' => 'id-at',
+            '2.5.4.41' => 'id-at-name',
+            '2.5.4.4' => 'id-at-surname',
+            '2.5.4.42' => 'id-at-givenName',
+            '2.5.4.43' => 'id-at-initials',
+            '2.5.4.44' => 'id-at-generationQualifier',
+            '2.5.4.3' => 'id-at-commonName',
+            '2.5.4.7' => 'id-at-localityName',
+            '2.5.4.8' => 'id-at-stateOrProvinceName',
+            '2.5.4.10' => 'id-at-organizationName',
+            '2.5.4.11' => 'id-at-organizationalUnitName',
+            '2.5.4.12' => 'id-at-title',
+            '2.5.4.13' => 'id-at-description',
+            '2.5.4.46' => 'id-at-dnQualifier',
+            '2.5.4.6' => 'id-at-countryName',
+            '2.5.4.5' => 'id-at-serialNumber',
+            '2.5.4.65' => 'id-at-pseudonym',
+            '2.5.4.17' => 'id-at-postalCode',
+            '2.5.4.9' => 'id-at-streetAddress',
+            '2.5.4.45' => 'id-at-uniqueIdentifier',
+            '2.5.4.72' => 'id-at-role',
+            '2.5.4.16' => 'id-at-postalAddress',
+
+            '0.9.2342.19200300.100.1.25' => 'id-domainComponent',
+            '1.2.840.113549.1.9' => 'pkcs-9',
+            '1.2.840.113549.1.9.1' => 'pkcs-9-at-emailAddress',
+            '2.5.29' => 'id-ce',
+            '2.5.29.35' => 'id-ce-authorityKeyIdentifier',
+            '2.5.29.14' => 'id-ce-subjectKeyIdentifier',
+            '2.5.29.15' => 'id-ce-keyUsage',
+            '2.5.29.16' => 'id-ce-privateKeyUsagePeriod',
+            '2.5.29.32' => 'id-ce-certificatePolicies',
+            '2.5.29.32.0' => 'anyPolicy',
+
+            '2.5.29.33' => 'id-ce-policyMappings',
+            '2.5.29.17' => 'id-ce-subjectAltName',
+            '2.5.29.18' => 'id-ce-issuerAltName',
+            '2.5.29.9' => 'id-ce-subjectDirectoryAttributes',
+            '2.5.29.19' => 'id-ce-basicConstraints',
+            '2.5.29.30' => 'id-ce-nameConstraints',
+            '2.5.29.36' => 'id-ce-policyConstraints',
+            '2.5.29.31' => 'id-ce-cRLDistributionPoints',
+            '2.5.29.37' => 'id-ce-extKeyUsage',
+            '2.5.29.37.0' => 'anyExtendedKeyUsage',
+            '1.3.6.1.5.5.7.3.1' => 'id-kp-serverAuth',
+            '1.3.6.1.5.5.7.3.2' => 'id-kp-clientAuth',
+            '1.3.6.1.5.5.7.3.3' => 'id-kp-codeSigning',
+            '1.3.6.1.5.5.7.3.4' => 'id-kp-emailProtection',
+            '1.3.6.1.5.5.7.3.8' => 'id-kp-timeStamping',
+            '1.3.6.1.5.5.7.3.9' => 'id-kp-OCSPSigning',
+            '2.5.29.54' => 'id-ce-inhibitAnyPolicy',
+            '2.5.29.46' => 'id-ce-freshestCRL',
+            '1.3.6.1.5.5.7.1.1' => 'id-pe-authorityInfoAccess',
+            '1.3.6.1.5.5.7.1.11' => 'id-pe-subjectInfoAccess',
+            '2.5.29.20' => 'id-ce-cRLNumber',
+            '2.5.29.28' => 'id-ce-issuingDistributionPoint',
+            '2.5.29.27' => 'id-ce-deltaCRLIndicator',
+            '2.5.29.21' => 'id-ce-cRLReasons',
+            '2.5.29.29' => 'id-ce-certificateIssuer',
+            '2.5.29.23' => 'id-ce-holdInstructionCode',
+            '1.2.840.10040.2' => 'holdInstruction',
+            '1.2.840.10040.2.1' => 'id-holdinstruction-none',
+            '1.2.840.10040.2.2' => 'id-holdinstruction-callissuer',
+            '1.2.840.10040.2.3' => 'id-holdinstruction-reject',
+            '2.5.29.24' => 'id-ce-invalidityDate',
+
+            '1.2.840.113549.2.2' => 'md2',
+            '1.2.840.113549.2.5' => 'md5',
+            '1.3.14.3.2.26' => 'id-sha1',
+            '1.2.840.10040.4.1' => 'id-dsa',
+            '1.2.840.10040.4.3' => 'id-dsa-with-sha1',
+            '1.2.840.113549.1.1' => 'pkcs-1',
+            '1.2.840.113549.1.1.1' => 'rsaEncryption',
+            '1.2.840.113549.1.1.2' => 'md2WithRSAEncryption',
+            '1.2.840.113549.1.1.4' => 'md5WithRSAEncryption',
+            '1.2.840.113549.1.1.5' => 'sha1WithRSAEncryption',
+            '1.2.840.10046.2.1' => 'dhpublicnumber',
+            '2.16.840.1.101.2.1.1.22' => 'id-keyExchangeAlgorithm',
+            '1.2.840.10045' => 'ansi-X9-62',
+            '1.2.840.10045.4' => 'id-ecSigType',
+            '1.2.840.10045.4.1' => 'ecdsa-with-SHA1',
+            '1.2.840.10045.1' => 'id-fieldType',
+            '1.2.840.10045.1.1' => 'prime-field',
+            '1.2.840.10045.1.2' => 'characteristic-two-field',
+            '1.2.840.10045.1.2.3' => 'id-characteristic-two-basis',
+            '1.2.840.10045.1.2.3.1' => 'gnBasis',
+            '1.2.840.10045.1.2.3.2' => 'tpBasis',
+            '1.2.840.10045.1.2.3.3' => 'ppBasis',
+            '1.2.840.10045.2' => 'id-publicKeyType',
+            '1.2.840.10045.2.1' => 'id-ecPublicKey',
+            '1.2.840.10045.3' => 'ellipticCurve',
+            '1.2.840.10045.3.0' => 'c-TwoCurve',
+            '1.2.840.10045.3.0.1' => 'c2pnb163v1',
+            '1.2.840.10045.3.0.2' => 'c2pnb163v2',
+            '1.2.840.10045.3.0.3' => 'c2pnb163v3',
+            '1.2.840.10045.3.0.4' => 'c2pnb176w1',
+            '1.2.840.10045.3.0.5' => 'c2pnb191v1',
+            '1.2.840.10045.3.0.6' => 'c2pnb191v2',
+            '1.2.840.10045.3.0.7' => 'c2pnb191v3',
+            '1.2.840.10045.3.0.8' => 'c2pnb191v4',
+            '1.2.840.10045.3.0.9' => 'c2pnb191v5',
+            '1.2.840.10045.3.0.10' => 'c2pnb208w1',
+            '1.2.840.10045.3.0.11' => 'c2pnb239v1',
+            '1.2.840.10045.3.0.12' => 'c2pnb239v2',
+            '1.2.840.10045.3.0.13' => 'c2pnb239v3',
+            '1.2.840.10045.3.0.14' => 'c2pnb239v4',
+            '1.2.840.10045.3.0.15' => 'c2pnb239v5',
+            '1.2.840.10045.3.0.16' => 'c2pnb272w1',
+            '1.2.840.10045.3.0.17' => 'c2pnb304w1',
+            '1.2.840.10045.3.0.18' => 'c2pnb359v1',
+            '1.2.840.10045.3.0.19' => 'c2pnb368w1',
+            '1.2.840.10045.3.0.20' => 'c2pnb431r1',
+            '1.2.840.10045.3.1' => 'primeCurve',
+            '1.2.840.10045.3.1.1' => 'prime192v1',
+            '1.2.840.10045.3.1.2' => 'prime192v2',
+            '1.2.840.10045.3.1.3' => 'prime192v3',
+            '1.2.840.10045.3.1.4' => 'prime239v1',
+            '1.2.840.10045.3.1.5' => 'prime239v2',
+            '1.2.840.10045.3.1.6' => 'prime239v3',
+            '1.2.840.10045.3.1.7' => 'prime256v1',
+            '1.2.840.113549.1.1.7' => 'id-RSAES-OAEP',
+            '1.2.840.113549.1.1.9' => 'id-pSpecified',
+            '1.2.840.113549.1.1.10' => 'id-RSASSA-PSS',
+            '1.2.840.113549.1.1.8' => 'id-mgf1',
+            '1.2.840.113549.1.1.14' => 'sha224WithRSAEncryption',
+            '1.2.840.113549.1.1.11' => 'sha256WithRSAEncryption',
+            '1.2.840.113549.1.1.12' => 'sha384WithRSAEncryption',
+            '1.2.840.113549.1.1.13' => 'sha512WithRSAEncryption',
+            '2.16.840.1.101.3.4.2.4' => 'id-sha224',
+            '2.16.840.1.101.3.4.2.1' => 'id-sha256',
+            '2.16.840.1.101.3.4.2.2' => 'id-sha384',
+            '2.16.840.1.101.3.4.2.3' => 'id-sha512',
+            '1.2.643.2.2.4' => 'id-GostR3411-94-with-GostR3410-94',
+            '1.2.643.2.2.3' => 'id-GostR3411-94-with-GostR3410-2001',
+            '1.2.643.2.2.20' => 'id-GostR3410-2001',
+            '1.2.643.2.2.19' => 'id-GostR3410-94',
+            // Netscape Object Identifiers from "Netscape Certificate Extensions"
+            '2.16.840.1.113730' => 'netscape',
+            '2.16.840.1.113730.1' => 'netscape-cert-extension',
+            '2.16.840.1.113730.1.1' => 'netscape-cert-type',
+            '2.16.840.1.113730.1.13' => 'netscape-comment',
+            '2.16.840.1.113730.1.8' => 'netscape-ca-policy-url',
+            // the following are X.509 extensions not supported by phpseclib
+            '1.3.6.1.5.5.7.1.12' => 'id-pe-logotype',
+            '1.2.840.113533.7.65.0' => 'entrustVersInfo',
+            '2.16.840.1.113733.1.6.9' => 'verisignPrivate',
+            // for Certificate Signing Requests
+            // see http://tools.ietf.org/html/rfc2985
+            '1.2.840.113549.1.9.2' => 'pkcs-9-at-unstructuredName', // PKCS #9 unstructured name
+            '1.2.840.113549.1.9.7' => 'pkcs-9-at-challengePassword', // Challenge password for certificate revocations
+            '1.2.840.113549.1.9.14' => 'pkcs-9-at-extensionRequest' // Certificate extension request
+        );
+    }
+
+    /**
+     * PHP4 compatible Default Constructor.
+     *
+     * @see self::__construct()
+     * @access public
+     */
+    function File_X509()
+    {
+        $this->__construct();
+    }
+
+    /**
+     * Load X.509 certificate
+     *
+     * Returns an associative array describing the X.509 cert or a false if the cert failed to load
+     *
+     * @param string $cert
+     * @param int $mode
+     * @access public
+     * @return mixed
+     */
+    function loadX509($cert, $mode = FILE_X509_FORMAT_AUTO_DETECT)
+    {
+        if (is_array($cert) && isset($cert['tbsCertificate'])) {
+            unset($this->currentCert);
+            unset($this->currentKeyIdentifier);
+            $this->dn = $cert['tbsCertificate']['subject'];
+            if (!isset($this->dn)) {
+                return false;
+            }
+            $this->currentCert = $cert;
+
+            $currentKeyIdentifier = $this->getExtension('id-ce-subjectKeyIdentifier');
+            $this->currentKeyIdentifier = is_string($currentKeyIdentifier) ? $currentKeyIdentifier : null;
+
+            unset($this->signatureSubject);
+
+            return $cert;
+        }
+
+        $asn1 = new File_ASN1();
+
+        if ($mode != FILE_X509_FORMAT_DER) {
+            $newcert = $this->_extractBER($cert);
+            if ($mode == FILE_X509_FORMAT_PEM && $cert == $newcert) {
+                return false;
+            }
+            $cert = $newcert;
+        }
+
+        if ($cert === false) {
+            $this->currentCert = false;
+            return false;
+        }
+
+        $asn1->loadOIDs($this->oids);
+        $decoded = $asn1->decodeBER($cert);
+
+        if (!empty($decoded)) {
+            $x509 = $asn1->asn1map($decoded[0], $this->Certificate);
+        }
+        if (!isset($x509) || $x509 === false) {
+            $this->currentCert = false;
+            return false;
+        }
+
+        $this->signatureSubject = substr($cert, $decoded[0]['content'][0]['start'], $decoded[0]['content'][0]['length']);
+
+        if ($this->_isSubArrayValid($x509, 'tbsCertificate/extensions')) {
+            $this->_mapInExtensions($x509, 'tbsCertificate/extensions', $asn1);
+        }
+        $this->_mapInDNs($x509, 'tbsCertificate/issuer/rdnSequence', $asn1);
+        $this->_mapInDNs($x509, 'tbsCertificate/subject/rdnSequence', $asn1);
+
+        $key = &$x509['tbsCertificate']['subjectPublicKeyInfo']['subjectPublicKey'];
+        $key = $this->_reformatKey($x509['tbsCertificate']['subjectPublicKeyInfo']['algorithm']['algorithm'], $key);
+
+        $this->currentCert = $x509;
+        $this->dn = $x509['tbsCertificate']['subject'];
+
+        $currentKeyIdentifier = $this->getExtension('id-ce-subjectKeyIdentifier');
+        $this->currentKeyIdentifier = is_string($currentKeyIdentifier) ? $currentKeyIdentifier : null;
+
+        return $x509;
+    }
+
+    /**
+     * Save X.509 certificate
+     *
+     * @param array $cert
+     * @param int $format optional
+     * @access public
+     * @return string
+     */
+    function saveX509($cert, $format = FILE_X509_FORMAT_PEM)
+    {
+        if (!is_array($cert) || !isset($cert['tbsCertificate'])) {
+            return false;
+        }
+
+        switch (true) {
+            // "case !$a: case !$b: break; default: whatever();" is the same thing as "if ($a && $b) whatever()"
+            case !($algorithm = $this->_subArray($cert, 'tbsCertificate/subjectPublicKeyInfo/algorithm/algorithm')):
+            case is_object($cert['tbsCertificate']['subjectPublicKeyInfo']['subjectPublicKey']):
+                break;
+            default:
+                switch ($algorithm) {
+                    case 'rsaEncryption':
+                        $cert['tbsCertificate']['subjectPublicKeyInfo']['subjectPublicKey']
+                            = base64_encode("\0" . base64_decode(preg_replace('#-.+-|[\r\n]#', '', $cert['tbsCertificate']['subjectPublicKeyInfo']['subjectPublicKey'])));
+                        /* "[For RSA keys] the parameters field MUST have ASN.1 type NULL for this algorithm identifier."
+                           -- https://tools.ietf.org/html/rfc3279#section-2.3.1
+
+                           given that and the fact that RSA keys appear ot be the only key type for which the parameters field can be blank,
+                           it seems like perhaps the ASN.1 description ought not say the parameters field is OPTIONAL, but whatever.
+                         */
+                        $cert['tbsCertificate']['subjectPublicKeyInfo']['algorithm']['parameters'] = null;
+                        // https://tools.ietf.org/html/rfc3279#section-2.2.1
+                        $cert['signatureAlgorithm']['parameters'] = null;
+                        $cert['tbsCertificate']['signature']['parameters'] = null;
+                }
+        }
+
+        $asn1 = new File_ASN1();
+        $asn1->loadOIDs($this->oids);
+
+        $filters = array();
+        $type_utf8_string = array('type' => FILE_ASN1_TYPE_UTF8_STRING);
+        $filters['tbsCertificate']['signature']['parameters'] = $type_utf8_string;
+        $filters['tbsCertificate']['signature']['issuer']['rdnSequence']['value'] = $type_utf8_string;
+        $filters['tbsCertificate']['issuer']['rdnSequence']['value'] = $type_utf8_string;
+        $filters['tbsCertificate']['subject']['rdnSequence']['value'] = $type_utf8_string;
+        $filters['tbsCertificate']['subjectPublicKeyInfo']['algorithm']['parameters'] = $type_utf8_string;
+        $filters['signatureAlgorithm']['parameters'] = $type_utf8_string;
+        $filters['authorityCertIssuer']['directoryName']['rdnSequence']['value'] = $type_utf8_string;
+        //$filters['policyQualifiers']['qualifier'] = $type_utf8_string;
+        $filters['distributionPoint']['fullName']['directoryName']['rdnSequence']['value'] = $type_utf8_string;
+        $filters['directoryName']['rdnSequence']['value'] = $type_utf8_string;
+
+        /* in the case of policyQualifiers/qualifier, the type has to be FILE_ASN1_TYPE_IA5_STRING.
+           FILE_ASN1_TYPE_PRINTABLE_STRING will cause OpenSSL's X.509 parser to spit out random
+           characters.
+         */
+        $filters['policyQualifiers']['qualifier']
+            = array('type' => FILE_ASN1_TYPE_IA5_STRING);
+
+        $asn1->loadFilters($filters);
+
+        $this->_mapOutExtensions($cert, 'tbsCertificate/extensions', $asn1);
+        $this->_mapOutDNs($cert, 'tbsCertificate/issuer/rdnSequence', $asn1);
+        $this->_mapOutDNs($cert, 'tbsCertificate/subject/rdnSequence', $asn1);
+
+        $cert = $asn1->encodeDER($cert, $this->Certificate);
+
+        switch ($format) {
+            case FILE_X509_FORMAT_DER:
+                return $cert;
+            // case FILE_X509_FORMAT_PEM:
+            default:
+                return "-----BEGIN CERTIFICATE-----\r\n" . chunk_split(base64_encode($cert), 64) . '-----END CERTIFICATE-----';
+        }
+    }
+
+    /**
+     * Map extension values from octet string to extension-specific internal
+     *   format.
+     *
+     * @param array ref $root
+     * @param string $path
+     * @param object $asn1
+     * @access private
+     */
+    function _mapInExtensions(&$root, $path, $asn1)
+    {
+        $extensions = &$this->_subArrayUnchecked($root, $path);
+
+        if ($extensions) {
+            for ($i = 0; $i < count($extensions); $i++) {
+                $id = $extensions[$i]['extnId'];
+                $value = &$extensions[$i]['extnValue'];
+                $value = base64_decode($value);
+                $decoded = $asn1->decodeBER($value);
+                /* [extnValue] contains the DER encoding of an ASN.1 value
+                   corresponding to the extension type identified by extnID */
+                $map = $this->_getMapping($id);
+                if (!is_bool($map)) {
+                    $mapped = $asn1->asn1map($decoded[0], $map, array('iPAddress' => array($this, '_decodeIP')));
+                    $value = $mapped === false ? $decoded[0] : $mapped;
+
+                    if ($id == 'id-ce-certificatePolicies') {
+                        for ($j = 0; $j < count($value); $j++) {
+                            if (!isset($value[$j]['policyQualifiers'])) {
+                                continue;
+                            }
+                            for ($k = 0; $k < count($value[$j]['policyQualifiers']); $k++) {
+                                $subid = $value[$j]['policyQualifiers'][$k]['policyQualifierId'];
+                                $map = $this->_getMapping($subid);
+                                $subvalue = &$value[$j]['policyQualifiers'][$k]['qualifier'];
+                                if ($map !== false) {
+                                    $decoded = $asn1->decodeBER($subvalue);
+                                    $mapped = $asn1->asn1map($decoded[0], $map);
+                                    $subvalue = $mapped === false ? $decoded[0] : $mapped;
+                                }
+                            }
+                        }
+                    }
+                } else {
+                    $value = base64_encode($value);
+                }
+            }
+        }
+    }
+
+    /**
+     * Map extension values from extension-specific internal format to
+     *   octet string.
+     *
+     * @param array ref $root
+     * @param string $path
+     * @param object $asn1
+     * @access private
+     */
+    function _mapOutExtensions(&$root, $path, $asn1)
+    {
+        $extensions = &$this->_subArray($root, $path);
+
+        if (is_array($extensions)) {
+            $size = count($extensions);
+            for ($i = 0; $i < $size; $i++) {
+                if (is_object($extensions[$i]) && strtolower(get_class($extensions[$i])) == 'file_asn1_element') {
+                    continue;
+                }
+
+                $id = $extensions[$i]['extnId'];
+                $value = &$extensions[$i]['extnValue'];
+
+                switch ($id) {
+                    case 'id-ce-certificatePolicies':
+                        for ($j = 0; $j < count($value); $j++) {
+                            if (!isset($value[$j]['policyQualifiers'])) {
+                                continue;
+                            }
+                            for ($k = 0; $k < count($value[$j]['policyQualifiers']); $k++) {
+                                $subid = $value[$j]['policyQualifiers'][$k]['policyQualifierId'];
+                                $map = $this->_getMapping($subid);
+                                $subvalue = &$value[$j]['policyQualifiers'][$k]['qualifier'];
+                                if ($map !== false) {
+                                    // by default File_ASN1 will try to render qualifier as a FILE_ASN1_TYPE_IA5_STRING since it's
+                                    // actual type is FILE_ASN1_TYPE_ANY
+                                    $subvalue = new File_ASN1_Element($asn1->encodeDER($subvalue, $map));
+                                }
+                            }
+                        }
+                        break;
+                    case 'id-ce-authorityKeyIdentifier': // use 00 as the serial number instead of an empty string
+                        if (isset($value['authorityCertSerialNumber'])) {
+                            if ($value['authorityCertSerialNumber']->toBytes() == '') {
+                                $temp = chr((FILE_ASN1_CLASS_CONTEXT_SPECIFIC << 6) | 2) . "\1\0";
+                                $value['authorityCertSerialNumber'] = new File_ASN1_Element($temp);
+                            }
+                        }
+                }
+
+                /* [extnValue] contains the DER encoding of an ASN.1 value
+                   corresponding to the extension type identified by extnID */
+                $map = $this->_getMapping($id);
+                if (is_bool($map)) {
+                    if (!$map) {
+                        user_error($id . ' is not a currently supported extension');
+                        unset($extensions[$i]);
+                    }
+                } else {
+                    $temp = $asn1->encodeDER($value, $map, array('iPAddress' => array($this, '_encodeIP')));
+                    $value = base64_encode($temp);
+                }
+            }
+        }
+    }
+
+    /**
+     * Map attribute values from ANY type to attribute-specific internal
+     *   format.
+     *
+     * @param array ref $root
+     * @param string $path
+     * @param object $asn1
+     * @access private
+     */
+    function _mapInAttributes(&$root, $path, $asn1)
+    {
+        $attributes = &$this->_subArray($root, $path);
+
+        if (is_array($attributes)) {
+            for ($i = 0; $i < count($attributes); $i++) {
+                $id = $attributes[$i]['type'];
+                /* $value contains the DER encoding of an ASN.1 value
+                   corresponding to the attribute type identified by type */
+                $map = $this->_getMapping($id);
+                if (is_array($attributes[$i]['value'])) {
+                    $values = &$attributes[$i]['value'];
+                    for ($j = 0; $j < count($values); $j++) {
+                        $value = $asn1->encodeDER($values[$j], $this->AttributeValue);
+                        $decoded = $asn1->decodeBER($value);
+                        if (!is_bool($map)) {
+                            $mapped = $asn1->asn1map($decoded[0], $map);
+                            if ($mapped !== false) {
+                                $values[$j] = $mapped;
+                            }
+                            if ($id == 'pkcs-9-at-extensionRequest' && $this->_isSubArrayValid($values, $j)) {
+                                $this->_mapInExtensions($values, $j, $asn1);
+                            }
+                        } elseif ($map) {
+                            $values[$j] = base64_encode($value);
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    /**
+     * Map attribute values from attribute-specific internal format to
+     *   ANY type.
+     *
+     * @param array ref $root
+     * @param string $path
+     * @param object $asn1
+     * @access private
+     */
+    function _mapOutAttributes(&$root, $path, $asn1)
+    {
+        $attributes = &$this->_subArray($root, $path);
+
+        if (is_array($attributes)) {
+            $size = count($attributes);
+            for ($i = 0; $i < $size; $i++) {
+                /* [value] contains the DER encoding of an ASN.1 value
+                   corresponding to the attribute type identified by type */
+                $id = $attributes[$i]['type'];
+                $map = $this->_getMapping($id);
+                if ($map === false) {
+                    user_error($id . ' is not a currently supported attribute', E_USER_NOTICE);
+                    unset($attributes[$i]);
+                } elseif (is_array($attributes[$i]['value'])) {
+                    $values = &$attributes[$i]['value'];
+                    for ($j = 0; $j < count($values); $j++) {
+                        switch ($id) {
+                            case 'pkcs-9-at-extensionRequest':
+                                $this->_mapOutExtensions($values, $j, $asn1);
+                                break;
+                        }
+
+                        if (!is_bool($map)) {
+                            $temp = $asn1->encodeDER($values[$j], $map);
+                            $decoded = $asn1->decodeBER($temp);
+                            $values[$j] = $asn1->asn1map($decoded[0], $this->AttributeValue);
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    /**
+     * Map DN values from ANY type to DN-specific internal
+     *   format.
+     *
+     * @param array ref $root
+     * @param string $path
+     * @param object $asn1
+     * @access private
+     */
+    function _mapInDNs(&$root, $path, $asn1)
+    {
+        $dns = &$this->_subArray($root, $path);
+
+        if (is_array($dns)) {
+            for ($i = 0; $i < count($dns); $i++) {
+                for ($j = 0; $j < count($dns[$i]); $j++) {
+                    $type = $dns[$i][$j]['type'];
+                    $value = &$dns[$i][$j]['value'];
+                    if (is_object($value) && strtolower(get_class($value)) == 'file_asn1_element') {
+                        $map = $this->_getMapping($type);
+                        if (!is_bool($map)) {
+                            $decoded = $asn1->decodeBER($value);
+                            $value = $asn1->asn1map($decoded[0], $map);
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    /**
+     * Map DN values from DN-specific internal format to
+     *   ANY type.
+     *
+     * @param array ref $root
+     * @param string $path
+     * @param object $asn1
+     * @access private
+     */
+    function _mapOutDNs(&$root, $path, $asn1)
+    {
+        $dns = &$this->_subArray($root, $path);
+
+        if (is_array($dns)) {
+            $size = count($dns);
+            for ($i = 0; $i < $size; $i++) {
+                for ($j = 0; $j < count($dns[$i]); $j++) {
+                    $type = $dns[$i][$j]['type'];
+                    $value = &$dns[$i][$j]['value'];
+                    if (is_object($value) && strtolower(get_class($value)) == 'file_asn1_element') {
+                        continue;
+                    }
+
+                    $map = $this->_getMapping($type);
+                    if (!is_bool($map)) {
+                        $value = new File_ASN1_Element($asn1->encodeDER($value, $map));
+                    }
+                }
+            }
+        }
+    }
+
+    /**
+     * Associate an extension ID to an extension mapping
+     *
+     * @param string $extnId
+     * @access private
+     * @return mixed
+     */
+    function _getMapping($extnId)
+    {
+        if (!is_string($extnId)) { // eg. if it's a File_ASN1_Element object
+            return true;
+        }
+
+        switch ($extnId) {
+            case 'id-ce-keyUsage':
+                return $this->KeyUsage;
+            case 'id-ce-basicConstraints':
+                return $this->BasicConstraints;
+            case 'id-ce-subjectKeyIdentifier':
+                return $this->KeyIdentifier;
+            case 'id-ce-cRLDistributionPoints':
+                return $this->CRLDistributionPoints;
+            case 'id-ce-authorityKeyIdentifier':
+                return $this->AuthorityKeyIdentifier;
+            case 'id-ce-certificatePolicies':
+                return $this->CertificatePolicies;
+            case 'id-ce-extKeyUsage':
+                return $this->ExtKeyUsageSyntax;
+            case 'id-pe-authorityInfoAccess':
+                return $this->AuthorityInfoAccessSyntax;
+            case 'id-ce-subjectAltName':
+                return $this->SubjectAltName;
+            case 'id-ce-subjectDirectoryAttributes':
+                return $this->SubjectDirectoryAttributes;
+            case 'id-ce-privateKeyUsagePeriod':
+                return $this->PrivateKeyUsagePeriod;
+            case 'id-ce-issuerAltName':
+                return $this->IssuerAltName;
+            case 'id-ce-policyMappings':
+                return $this->PolicyMappings;
+            case 'id-ce-nameConstraints':
+                return $this->NameConstraints;
+
+            case 'netscape-cert-type':
+                return $this->netscape_cert_type;
+            case 'netscape-comment':
+                return $this->netscape_comment;
+            case 'netscape-ca-policy-url':
+                return $this->netscape_ca_policy_url;
+
+            // since id-qt-cps isn't a constructed type it will have already been decoded as a string by the time it gets
+            // back around to asn1map() and we don't want it decoded again.
+            //case 'id-qt-cps':
+            //    return $this->CPSuri;
+            case 'id-qt-unotice':
+                return $this->UserNotice;
+
+            // the following OIDs are unsupported but we don't want them to give notices when calling saveX509().
+            case 'id-pe-logotype': // http://www.ietf.org/rfc/rfc3709.txt
+            case 'entrustVersInfo':
+            // http://support.microsoft.com/kb/287547
+            case '1.3.6.1.4.1.311.20.2': // szOID_ENROLL_CERTTYPE_EXTENSION
+            case '1.3.6.1.4.1.311.21.1': // szOID_CERTSRV_CA_VERSION
+            // "SET Secure Electronic Transaction Specification"
+            // http://www.maithean.com/docs/set_bk3.pdf
+            case '2.23.42.7.0': // id-set-hashedRootKey
+            // "Certificate Transparency"
+            // https://tools.ietf.org/html/rfc6962
+            case '1.3.6.1.4.1.11129.2.4.2':
+                return true;
+
+            // CSR attributes
+            case 'pkcs-9-at-unstructuredName':
+                return $this->PKCS9String;
+            case 'pkcs-9-at-challengePassword':
+                return $this->DirectoryString;
+            case 'pkcs-9-at-extensionRequest':
+                return $this->Extensions;
+
+            // CRL extensions.
+            case 'id-ce-cRLNumber':
+                return $this->CRLNumber;
+            case 'id-ce-deltaCRLIndicator':
+                return $this->CRLNumber;
+            case 'id-ce-issuingDistributionPoint':
+                return $this->IssuingDistributionPoint;
+            case 'id-ce-freshestCRL':
+                return $this->CRLDistributionPoints;
+            case 'id-ce-cRLReasons':
+                return $this->CRLReason;
+            case 'id-ce-invalidityDate':
+                return $this->InvalidityDate;
+            case 'id-ce-certificateIssuer':
+                return $this->CertificateIssuer;
+            case 'id-ce-holdInstructionCode':
+                return $this->HoldInstructionCode;
+            case 'id-at-postalAddress':
+                return $this->PostalAddress;
+        }
+
+        return false;
+    }
+
+    /**
+     * Load an X.509 certificate as a certificate authority
+     *
+     * @param string $cert
+     * @access public
+     * @return bool
+     */
+    function loadCA($cert)
+    {
+        $olddn = $this->dn;
+        $oldcert = $this->currentCert;
+        $oldsigsubj = $this->signatureSubject;
+        $oldkeyid = $this->currentKeyIdentifier;
+
+        $cert = $this->loadX509($cert);
+        if (!$cert) {
+            $this->dn = $olddn;
+            $this->currentCert = $oldcert;
+            $this->signatureSubject = $oldsigsubj;
+            $this->currentKeyIdentifier = $oldkeyid;
+
+            return false;
+        }
+
+        /* From RFC5280 "PKIX Certificate and CRL Profile":
+
+           If the keyUsage extension is present, then the subject public key
+           MUST NOT be used to verify signatures on certificates or CRLs unless
+           the corresponding keyCertSign or cRLSign bit is set. */
+        //$keyUsage = $this->getExtension('id-ce-keyUsage');
+        //if ($keyUsage && !in_array('keyCertSign', $keyUsage)) {
+        //    return false;
+        //}
+
+        /* From RFC5280 "PKIX Certificate and CRL Profile":
+
+           The cA boolean indicates whether the certified public key may be used
+           to verify certificate signatures.  If the cA boolean is not asserted,
+           then the keyCertSign bit in the key usage extension MUST NOT be
+           asserted.  If the basic constraints extension is not present in a
+           version 3 certificate, or the extension is present but the cA boolean
+           is not asserted, then the certified public key MUST NOT be used to
+           verify certificate signatures. */
+        //$basicConstraints = $this->getExtension('id-ce-basicConstraints');
+        //if (!$basicConstraints || !$basicConstraints['cA']) {
+        //    return false;
+        //}
+
+        $this->CAs[] = $cert;
+
+        $this->dn = $olddn;
+        $this->currentCert = $oldcert;
+        $this->signatureSubject = $oldsigsubj;
+
+        return true;
+    }
+
+    /**
+     * Validate an X.509 certificate against a URL
+     *
+     * From RFC2818 "HTTP over TLS":
+     *
+     * Matching is performed using the matching rules specified by
+     * [RFC2459].  If more than one identity of a given type is present in
+     * the certificate (e.g., more than one dNSName name, a match in any one
+     * of the set is considered acceptable.) Names may contain the wildcard
+     * character * which is considered to match any single domain name
+     * component or component fragment. E.g., *.a.com matches foo.a.com but
+     * not bar.foo.a.com. f*.com matches foo.com but not bar.com.
+     *
+     * @param string $url
+     * @access public
+     * @return bool
+     */
+    function validateURL($url)
+    {
+        if (!is_array($this->currentCert) || !isset($this->currentCert['tbsCertificate'])) {
+            return false;
+        }
+
+        $components = parse_url($url);
+        if (!isset($components['host'])) {
+            return false;
+        }
+
+        if ($names = $this->getExtension('id-ce-subjectAltName')) {
+            foreach ($names as $name) {
+                foreach ($name as $key => $value) {
+                    $value = str_replace(array('.', '*'), array('\.', '[^.]*'), $value);
+                    switch ($key) {
+                        case 'dNSName':
+                            /* From RFC2818 "HTTP over TLS":
+
+                               If a subjectAltName extension of type dNSName is present, that MUST
+                               be used as the identity. Otherwise, the (most specific) Common Name
+                               field in the Subject field of the certificate MUST be used. Although
+                               the use of the Common Name is existing practice, it is deprecated and
+                               Certification Authorities are encouraged to use the dNSName instead. */
+                            if (preg_match('#^' . $value . '$#', $components['host'])) {
+                                return true;
+                            }
+                            break;
+                        case 'iPAddress':
+                            /* From RFC2818 "HTTP over TLS":
+
+                               In some cases, the URI is specified as an IP address rather than a
+                               hostname. In this case, the iPAddress subjectAltName must be present
+                               in the certificate and must exactly match the IP in the URI. */
+                            if (preg_match('#(?:\d{1-3}\.){4}#', $components['host'] . '.') && preg_match('#^' . $value . '$#', $components['host'])) {
+                                return true;
+                            }
+                    }
+                }
+            }
+            return false;
+        }
+
+        if ($value = $this->getDNProp('id-at-commonName')) {
+            $value = str_replace(array('.', '*'), array('\.', '[^.]*'), $value[0]);
+            return preg_match('#^' . $value . '$#', $components['host']);
+        }
+
+        return false;
+    }
+
+    /**
+     * Validate a date
+     *
+     * If $date isn't defined it is assumed to be the current date.
+     *
+     * @param \DateTime|int|string $date optional
+     * @access public
+     */
+    function validateDate($date = null)
+    {
+        if (!is_array($this->currentCert) || !isset($this->currentCert['tbsCertificate'])) {
+            return false;
+        }
+
+        if (!isset($date)) {
+            $date = class_exists('DateTime') ?
+                new DateTime(null, new DateTimeZone(@date_default_timezone_get())) :
+                time();
+        }
+
+        $notBefore = $this->currentCert['tbsCertificate']['validity']['notBefore'];
+        $notBefore = isset($notBefore['generalTime']) ? $notBefore['generalTime'] : $notBefore['utcTime'];
+
+        $notAfter = $this->currentCert['tbsCertificate']['validity']['notAfter'];
+        $notAfter = isset($notAfter['generalTime']) ? $notAfter['generalTime'] : $notAfter['utcTime'];
+
+        switch (true) {
+            case is_string($date) && class_exists('DateTime'):
+                $date = new DateTime($date, new DateTimeZone(@date_default_timezone_get()));
+            case is_object($date) && strtolower(get_class($date)) == 'datetime':
+                $notBefore = new DateTime($notBefore, new DateTimeZone(@date_default_timezone_get()));
+                $notAfter = new DateTime($notAfter, new DateTimeZone(@date_default_timezone_get()));
+                break;
+            case is_string($date):
+                $date = @strtotime($date);
+            default:
+                $notBefore = @strtotime($notBefore);
+                $notAfter = @strtotime($notAfter);
+        }
+
+        switch (true) {
+            case $date < $notBefore:
+            case $date > $notAfter:
+                return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * Fetches a URL
+     *
+     * @param string $url
+     * @access private
+     * @return bool|string
+     */
+    function _fetchURL($url)
+    {
+        if ($this->disable_url_fetch) {
+            return false;
+        }
+
+        $parts = parse_url($url);
+        $data = '';
+        switch ($parts['scheme']) {
+            case 'http':
+                $fsock = @fsockopen($parts['host'], isset($parts['port']) ? $parts['port'] : 80);
+                if (!$fsock) {
+                    return false;
+                }
+                fputs($fsock, "GET $parts[path] HTTP/1.0\r\n");
+                fputs($fsock, "Host: $parts[host]\r\n\r\n");
+                $line = fgets($fsock, 1024);
+                if (strlen($line) < 3) {
+                    return false;
+                }
+                preg_match('#HTTP/1.\d (\d{3})#', $line, $temp);
+                if ($temp[1] != '200') {
+                    return false;
+                }
+
+                // skip the rest of the headers in the http response
+                while (!feof($fsock) && fgets($fsock, 1024) != "\r\n") {
+                }
+
+                while (!feof($fsock)) {
+                    $data.= fread($fsock, 1024);
+                }
+
+                break;
+            //case 'ftp':
+            //case 'ldap':
+            //default:
+        }
+
+        return $data;
+    }
+
+    /**
+     * Validates an intermediate cert as identified via authority info access extension
+     *
+     * See https://tools.ietf.org/html/rfc4325 for more info
+     *
+     * @param bool $caonly
+     * @param int $count
+     * @access private
+     * @return bool
+     */
+    function _testForIntermediate($caonly, $count)
+    {
+        $opts = $this->getExtension('id-pe-authorityInfoAccess');
+        if (!is_array($opts)) {
+            return false;
+        }
+        foreach ($opts as $opt) {
+            if ($opt['accessMethod'] == 'id-ad-caIssuers') {
+                // accessLocation is a GeneralName. GeneralName fields support stuff like email addresses, IP addresses, LDAP,
+                // etc, but we're only supporting URI's. URI's and LDAP are the only thing https://tools.ietf.org/html/rfc4325
+                // discusses
+                if (isset($opt['accessLocation']['uniformResourceIdentifier'])) {
+                    $url = $opt['accessLocation']['uniformResourceIdentifier'];
+                    break;
+                }
+            }
+        }
+
+        if (!isset($url)) {
+            return false;
+        }
+
+        $cert = $this->_fetchURL($url);
+        if (!is_string($cert)) {
+            return false;
+        }
+
+        $parent = new static();
+        $parent->CAs = $this->CAs;
+        /*
+         "Conforming applications that support HTTP or FTP for accessing
+          certificates MUST be able to accept .cer files and SHOULD be able
+          to accept .p7c files." -- https://tools.ietf.org/html/rfc4325
+
+         A .p7c file is 'a "certs-only" CMS message as specified in RFC 2797"
+
+         These are currently unsupported
+        */
+        if (!is_array($parent->loadX509($cert))) {
+            return false;
+        }
+
+        if (!$parent->_validateSignatureCountable($caonly, ++$count)) {
+            return false;
+        }
+
+        $this->CAs[] = $parent->currentCert;
+        //$this->loadCA($cert);
+
+        return true;
+    }
+
+    /**
+     * Validate a signature
+     *
+     * Works on X.509 certs, CSR's and CRL's.
+     * Returns true if the signature is verified, false if it is not correct or null on error
+     *
+     * By default returns false for self-signed certs. Call validateSignature(false) to make this support
+     * self-signed.
+     *
+     * The behavior of this function is inspired by {@link http://php.net/openssl-verify openssl_verify}.
+     *
+     * @param bool $caonly optional
+     * @access public
+     * @return mixed
+     */
+    function validateSignature($caonly = true)
+    {
+        return $this->_validateSignatureCountable($caonly, 0);
+    }
+
+    /**
+     * Validate a signature
+     *
+     * Performs said validation whilst keeping track of how many times validation method is called
+     *
+     * @param bool $caonly
+     * @param int $count
+     * @access private
+     * @return mixed
+     */
+    function _validateSignatureCountable($caonly, $count)
+    {
+        if (!is_array($this->currentCert) || !isset($this->signatureSubject)) {
+            return null;
+        }
+
+        if ($count == $this->recur_limit) {
+            return false;
+        }
+
+        /* TODO:
+           "emailAddress attribute values are not case-sensitive (e.g., "subscriber@example.com" is the same as "SUBSCRIBER@EXAMPLE.COM")."
+            -- http://tools.ietf.org/html/rfc5280#section-4.1.2.6
+
+           implement pathLenConstraint in the id-ce-basicConstraints extension */
+
+        switch (true) {
+            case isset($this->currentCert['tbsCertificate']):
+                // self-signed cert
+                switch (true) {
+                    case !defined('FILE_X509_IGNORE_TYPE') && $this->currentCert['tbsCertificate']['issuer'] === $this->currentCert['tbsCertificate']['subject']:
+                    case defined('FILE_X509_IGNORE_TYPE') && $this->getIssuerDN(FILE_X509_DN_STRING) === $this->getDN(FILE_X509_DN_STRING):
+                        $authorityKey = $this->getExtension('id-ce-authorityKeyIdentifier');
+                        $subjectKeyID = $this->getExtension('id-ce-subjectKeyIdentifier');
+                        switch (true) {
+                            case !is_array($authorityKey):
+                            case !$subjectKeyID:
+                            case isset($authorityKey['keyIdentifier']) && $authorityKey['keyIdentifier'] === $subjectKeyID:
+                                $signingCert = $this->currentCert; // working cert
+                        }
+                }
+
+                if (!empty($this->CAs)) {
+                    for ($i = 0; $i < count($this->CAs); $i++) {
+                        // even if the cert is a self-signed one we still want to see if it's a CA;
+                        // if not, we'll conditionally return an error
+                        $ca = $this->CAs[$i];
+                        switch (true) {
+                            case !defined('FILE_X509_IGNORE_TYPE') && $this->currentCert['tbsCertificate']['issuer'] === $ca['tbsCertificate']['subject']:
+                            case defined('FILE_X509_IGNORE_TYPE') && $this->getDN(FILE_X509_DN_STRING, $this->currentCert['tbsCertificate']['issuer']) === $this->getDN(FILE_X509_DN_STRING, $ca['tbsCertificate']['subject']):
+                                $authorityKey = $this->getExtension('id-ce-authorityKeyIdentifier');
+                                $subjectKeyID = $this->getExtension('id-ce-subjectKeyIdentifier', $ca);
+                                switch (true) {
+                                    case !is_array($authorityKey):
+                                    case !$subjectKeyID:
+                                    case isset($authorityKey['keyIdentifier']) && $authorityKey['keyIdentifier'] === $subjectKeyID:
+                                        if (is_array($authorityKey) && isset($authorityKey['authorityCertSerialNumber']) && !$authorityKey['authorityCertSerialNumber']->equals($ca['tbsCertificate']['serialNumber'])) {
+                                            break 2; // serial mismatch - check other ca
+                                        }
+                                        $signingCert = $ca; // working cert
+                                        break 3;
+                                }
+                        }
+                    }
+                    if (count($this->CAs) == $i && $caonly) {
+                        return $this->_testForIntermediate($caonly, $count) && $this->validateSignature($caonly);
+                    }
+                } elseif (!isset($signingCert) || $caonly) {
+                    return $this->_testForIntermediate($caonly, $count) && $this->validateSignature($caonly);
+                }
+                return $this->_validateSignature(
+                    $signingCert['tbsCertificate']['subjectPublicKeyInfo']['algorithm']['algorithm'],
+                    $signingCert['tbsCertificate']['subjectPublicKeyInfo']['subjectPublicKey'],
+                    $this->currentCert['signatureAlgorithm']['algorithm'],
+                    substr(base64_decode($this->currentCert['signature']), 1),
+                    $this->signatureSubject
+                );
+            case isset($this->currentCert['certificationRequestInfo']):
+                return $this->_validateSignature(
+                    $this->currentCert['certificationRequestInfo']['subjectPKInfo']['algorithm']['algorithm'],
+                    $this->currentCert['certificationRequestInfo']['subjectPKInfo']['subjectPublicKey'],
+                    $this->currentCert['signatureAlgorithm']['algorithm'],
+                    substr(base64_decode($this->currentCert['signature']), 1),
+                    $this->signatureSubject
+                );
+            case isset($this->currentCert['publicKeyAndChallenge']):
+                return $this->_validateSignature(
+                    $this->currentCert['publicKeyAndChallenge']['spki']['algorithm']['algorithm'],
+                    $this->currentCert['publicKeyAndChallenge']['spki']['subjectPublicKey'],
+                    $this->currentCert['signatureAlgorithm']['algorithm'],
+                    substr(base64_decode($this->currentCert['signature']), 1),
+                    $this->signatureSubject
+                );
+            case isset($this->currentCert['tbsCertList']):
+                if (!empty($this->CAs)) {
+                    for ($i = 0; $i < count($this->CAs); $i++) {
+                        $ca = $this->CAs[$i];
+                        switch (true) {
+                            case !defined('FILE_X509_IGNORE_TYPE') && $this->currentCert['tbsCertList']['issuer'] === $ca['tbsCertificate']['subject']:
+                            case defined('FILE_X509_IGNORE_TYPE') && $this->getDN(FILE_X509_DN_STRING, $this->currentCert['tbsCertList']['issuer']) === $this->getDN(FILE_X509_DN_STRING, $ca['tbsCertificate']['subject']):
+                                $authorityKey = $this->getExtension('id-ce-authorityKeyIdentifier');
+                                $subjectKeyID = $this->getExtension('id-ce-subjectKeyIdentifier', $ca);
+                                switch (true) {
+                                    case !is_array($authorityKey):
+                                    case !$subjectKeyID:
+                                    case isset($authorityKey['keyIdentifier']) && $authorityKey['keyIdentifier'] === $subjectKeyID:
+                                        if (is_array($authorityKey) && isset($authorityKey['authorityCertSerialNumber']) && !$authorityKey['authorityCertSerialNumber']->equals($ca['tbsCertificate']['serialNumber'])) {
+                                            break 2; // serial mismatch - check other ca
+                                        }
+                                        $signingCert = $ca; // working cert
+                                        break 3;
+                                }
+                        }
+                    }
+                }
+                if (!isset($signingCert)) {
+                    return false;
+                }
+                return $this->_validateSignature(
+                    $signingCert['tbsCertificate']['subjectPublicKeyInfo']['algorithm']['algorithm'],
+                    $signingCert['tbsCertificate']['subjectPublicKeyInfo']['subjectPublicKey'],
+                    $this->currentCert['signatureAlgorithm']['algorithm'],
+                    substr(base64_decode($this->currentCert['signature']), 1),
+                    $this->signatureSubject
+                );
+            default:
+                return false;
+        }
+    }
+
+    /**
+     * Validates a signature
+     *
+     * Returns true if the signature is verified, false if it is not correct or null on error
+     *
+     * @param string $publicKeyAlgorithm
+     * @param string $publicKey
+     * @param string $signatureAlgorithm
+     * @param string $signature
+     * @param string $signatureSubject
+     * @access private
+     * @return int
+     */
+    function _validateSignature($publicKeyAlgorithm, $publicKey, $signatureAlgorithm, $signature, $signatureSubject)
+    {
+        switch ($publicKeyAlgorithm) {
+            case 'rsaEncryption':
+                if (!class_exists('Crypt_RSA')) {
+                    include_once 'Crypt/RSA.php';
+                }
+                $rsa = new Crypt_RSA();
+                $rsa->loadKey($publicKey);
+
+                switch ($signatureAlgorithm) {
+                    case 'md2WithRSAEncryption':
+                    case 'md5WithRSAEncryption':
+                    case 'sha1WithRSAEncryption':
+                    case 'sha224WithRSAEncryption':
+                    case 'sha256WithRSAEncryption':
+                    case 'sha384WithRSAEncryption':
+                    case 'sha512WithRSAEncryption':
+                        $rsa->setHash(preg_replace('#WithRSAEncryption$#', '', $signatureAlgorithm));
+                        $rsa->setSignatureMode(CRYPT_RSA_SIGNATURE_PKCS1);
+                        if (!@$rsa->verify($signatureSubject, $signature)) {
+                            return false;
+                        }
+                        break;
+                    default:
+                        return null;
+                }
+                break;
+            default:
+                return null;
+        }
+
+        return true;
+    }
+
+    /**
+     * Sets the recursion limit
+     *
+     * When validating a signature it may be necessary to download intermediate certs from URI's.
+     * An intermediate cert that linked to itself would result in an infinite loop so to prevent
+     * that we set a recursion limit. A negative number means that there is no recursion limit.
+     *
+     * @param int $count
+     * @access public
+     */
+    function setRecurLimit($count)
+    {
+        $this->recur_limit = $count;
+    }
+
+    /**
+     * Prevents URIs from being automatically retrieved
+     *
+     * @access public
+     */
+    function disableURLFetch()
+    {
+        $this->disable_url_fetch = true;
+    }
+
+    /**
+     * Allows URIs to be automatically retrieved
+     *
+     * @access public
+     */
+    function enableURLFetch()
+    {
+        $this->disable_url_fetch = false;
+    }
+
+    /**
+     * Reformat public keys
+     *
+     * Reformats a public key to a format supported by phpseclib (if applicable)
+     *
+     * @param string $algorithm
+     * @param string $key
+     * @access private
+     * @return string
+     */
+    function _reformatKey($algorithm, $key)
+    {
+        switch ($algorithm) {
+            case 'rsaEncryption':
+                return
+                    "-----BEGIN RSA PUBLIC KEY-----\r\n" .
+                    // subjectPublicKey is stored as a bit string in X.509 certs.  the first byte of a bit string represents how many bits
+                    // in the last byte should be ignored.  the following only supports non-zero stuff but as none of the X.509 certs Firefox
+                    // uses as a cert authority actually use a non-zero bit I think it's safe to assume that none do.
+                    chunk_split(base64_encode(substr(base64_decode($key), 1)), 64) .
+                    '-----END RSA PUBLIC KEY-----';
+            default:
+                return $key;
+        }
+    }
+
+    /**
+     * Decodes an IP address
+     *
+     * Takes in a base64 encoded "blob" and returns a human readable IP address
+     *
+     * @param string $ip
+     * @access private
+     * @return string
+     */
+    function _decodeIP($ip)
+    {
+        $ip = base64_decode($ip);
+        list(, $ip) = unpack('N', $ip);
+        return long2ip($ip);
+    }
+
+    /**
+     * Encodes an IP address
+     *
+     * Takes a human readable IP address into a base64-encoded "blob"
+     *
+     * @param string $ip
+     * @access private
+     * @return string
+     */
+    function _encodeIP($ip)
+    {
+        return base64_encode(pack('N', ip2long($ip)));
+    }
+
+    /**
+     * "Normalizes" a Distinguished Name property
+     *
+     * @param string $propName
+     * @access private
+     * @return mixed
+     */
+    function _translateDNProp($propName)
+    {
+        switch (strtolower($propName)) {
+            case 'id-at-countryname':
+            case 'countryname':
+            case 'c':
+                return 'id-at-countryName';
+            case 'id-at-organizationname':
+            case 'organizationname':
+            case 'o':
+                return 'id-at-organizationName';
+            case 'id-at-dnqualifier':
+            case 'dnqualifier':
+                return 'id-at-dnQualifier';
+            case 'id-at-commonname':
+            case 'commonname':
+            case 'cn':
+                return 'id-at-commonName';
+            case 'id-at-stateorprovincename':
+            case 'stateorprovincename':
+            case 'state':
+            case 'province':
+            case 'provincename':
+            case 'st':
+                return 'id-at-stateOrProvinceName';
+            case 'id-at-localityname':
+            case 'localityname':
+            case 'l':
+                return 'id-at-localityName';
+            case 'id-emailaddress':
+            case 'emailaddress':
+                return 'pkcs-9-at-emailAddress';
+            case 'id-at-serialnumber':
+            case 'serialnumber':
+                return 'id-at-serialNumber';
+            case 'id-at-postalcode':
+            case 'postalcode':
+                return 'id-at-postalCode';
+            case 'id-at-streetaddress':
+            case 'streetaddress':
+                return 'id-at-streetAddress';
+            case 'id-at-name':
+            case 'name':
+                return 'id-at-name';
+            case 'id-at-givenname':
+            case 'givenname':
+                return 'id-at-givenName';
+            case 'id-at-surname':
+            case 'surname':
+            case 'sn':
+                return 'id-at-surname';
+            case 'id-at-initials':
+            case 'initials':
+                return 'id-at-initials';
+            case 'id-at-generationqualifier':
+            case 'generationqualifier':
+                return 'id-at-generationQualifier';
+            case 'id-at-organizationalunitname':
+            case 'organizationalunitname':
+            case 'ou':
+                return 'id-at-organizationalUnitName';
+            case 'id-at-pseudonym':
+            case 'pseudonym':
+                return 'id-at-pseudonym';
+            case 'id-at-title':
+            case 'title':
+                return 'id-at-title';
+            case 'id-at-description':
+            case 'description':
+                return 'id-at-description';
+            case 'id-at-role':
+            case 'role':
+                return 'id-at-role';
+            case 'id-at-uniqueidentifier':
+            case 'uniqueidentifier':
+            case 'x500uniqueidentifier':
+                return 'id-at-uniqueIdentifier';
+            case 'postaladdress':
+            case 'id-at-postaladdress':
+                return 'id-at-postalAddress';
+            default:
+                return false;
+        }
+    }
+
+    /**
+     * Set a Distinguished Name property
+     *
+     * @param string $propName
+     * @param mixed $propValue
+     * @param string $type optional
+     * @access public
+     * @return bool
+     */
+    function setDNProp($propName, $propValue, $type = 'utf8String')
+    {
+        if (empty($this->dn)) {
+            $this->dn = array('rdnSequence' => array());
+        }
+
+        if (($propName = $this->_translateDNProp($propName)) === false) {
+            return false;
+        }
+
+        foreach ((array) $propValue as $v) {
+            if (!is_array($v) && isset($type)) {
+                $v = array($type => $v);
+            }
+            $this->dn['rdnSequence'][] = array(
+                array(
+                    'type' => $propName,
+                    'value'=> $v
+                )
+            );
+        }
+
+        return true;
+    }
+
+    /**
+     * Remove Distinguished Name properties
+     *
+     * @param string $propName
+     * @access public
+     */
+    function removeDNProp($propName)
+    {
+        if (empty($this->dn)) {
+            return;
+        }
+
+        if (($propName = $this->_translateDNProp($propName)) === false) {
+            return;
+        }
+
+        $dn = &$this->dn['rdnSequence'];
+        $size = count($dn);
+        for ($i = 0; $i < $size; $i++) {
+            if ($dn[$i][0]['type'] == $propName) {
+                unset($dn[$i]);
+            }
+        }
+
+        $dn = array_values($dn);
+        // fix for https://bugs.php.net/75433 affecting PHP 7.2
+        if (!isset($dn[0])) {
+            $dn = array_splice($dn, 0, 0);
+        }
+    }
+
+    /**
+     * Get Distinguished Name properties
+     *
+     * @param string $propName
+     * @param array $dn optional
+     * @param bool $withType optional
+     * @return mixed
+     * @access public
+     */
+    function getDNProp($propName, $dn = null, $withType = false)
+    {
+        if (!isset($dn)) {
+            $dn = $this->dn;
+        }
+
+        if (empty($dn)) {
+            return false;
+        }
+
+        if (($propName = $this->_translateDNProp($propName)) === false) {
+            return false;
+        }
+
+        $asn1 = new File_ASN1();
+        $asn1->loadOIDs($this->oids);
+        $filters = array();
+        $filters['value'] = array('type' => FILE_ASN1_TYPE_UTF8_STRING);
+        $asn1->loadFilters($filters);
+        $this->_mapOutDNs($dn, 'rdnSequence', $asn1);
+        $dn = $dn['rdnSequence'];
+        $result = array();
+        for ($i = 0; $i < count($dn); $i++) {
+            if ($dn[$i][0]['type'] == $propName) {
+                $v = $dn[$i][0]['value'];
+                if (!$withType) {
+                    if (is_array($v)) {
+                        foreach ($v as $type => $s) {
+                            $type = array_search($type, $asn1->ANYmap, true);
+                            if ($type !== false && isset($asn1->stringTypeSize[$type])) {
+                                $s = $asn1->convert($s, $type);
+                                if ($s !== false) {
+                                    $v = $s;
+                                    break;
+                                }
+                            }
+                        }
+                        if (is_array($v)) {
+                            $v = array_pop($v); // Always strip data type.
+                        }
+                    } elseif (is_object($v) && strtolower(get_class($v)) == 'file_asn1_element') {
+                        $map = $this->_getMapping($propName);
+                        if (!is_bool($map)) {
+                            $decoded = $asn1->decodeBER($v);
+                            $v = $asn1->asn1map($decoded[0], $map);
+                        }
+                    }
+                }
+                $result[] = $v;
+            }
+        }
+
+        return $result;
+    }
+
+    /**
+     * Set a Distinguished Name
+     *
+     * @param mixed $dn
+     * @param bool $merge optional
+     * @param string $type optional
+     * @access public
+     * @return bool
+     */
+    function setDN($dn, $merge = false, $type = 'utf8String')
+    {
+        if (!$merge) {
+            $this->dn = null;
+        }
+
+        if (is_array($dn)) {
+            if (isset($dn['rdnSequence'])) {
+                $this->dn = $dn; // No merge here.
+                return true;
+            }
+
+            // handles stuff generated by openssl_x509_parse()
+            foreach ($dn as $prop => $value) {
+                if (!$this->setDNProp($prop, $value, $type)) {
+                    return false;
+                }
+            }
+            return true;
+        }
+
+        // handles everything else
+        $results = preg_split('#((?:^|, *|/)(?:C=|O=|OU=|CN=|L=|ST=|SN=|postalCode=|streetAddress=|emailAddress=|serialNumber=|organizationalUnitName=|title=|description=|role=|x500UniqueIdentifier=|postalAddress=))#', $dn, -1, PREG_SPLIT_DELIM_CAPTURE);
+        for ($i = 1; $i < count($results); $i+=2) {
+            $prop = trim($results[$i], ', =/');
+            $value = $results[$i + 1];
+            if (!$this->setDNProp($prop, $value, $type)) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    /**
+     * Get the Distinguished Name for a certificates subject
+     *
+     * @param mixed $format optional
+     * @param array $dn optional
+     * @access public
+     * @return bool
+     */
+    function getDN($format = FILE_X509_DN_ARRAY, $dn = null)
+    {
+        if (!isset($dn)) {
+            $dn = isset($this->currentCert['tbsCertList']) ? $this->currentCert['tbsCertList']['issuer'] : $this->dn;
+        }
+
+        switch ((int) $format) {
+            case FILE_X509_DN_ARRAY:
+                return $dn;
+            case FILE_X509_DN_ASN1:
+                $asn1 = new File_ASN1();
+                $asn1->loadOIDs($this->oids);
+                $filters = array();
+                $filters['rdnSequence']['value'] = array('type' => FILE_ASN1_TYPE_UTF8_STRING);
+                $asn1->loadFilters($filters);
+                $this->_mapOutDNs($dn, 'rdnSequence', $asn1);
+                return $asn1->encodeDER($dn, $this->Name);
+            case FILE_X509_DN_CANON:
+                //  No SEQUENCE around RDNs and all string values normalized as
+                // trimmed lowercase UTF-8 with all spacing as one blank.
+                // constructed RDNs will not be canonicalized
+                $asn1 = new File_ASN1();
+                $asn1->loadOIDs($this->oids);
+                $filters = array();
+                $filters['value'] = array('type' => FILE_ASN1_TYPE_UTF8_STRING);
+                $asn1->loadFilters($filters);
+                $result = '';
+                $this->_mapOutDNs($dn, 'rdnSequence', $asn1);
+                foreach ($dn['rdnSequence'] as $rdn) {
+                    foreach ($rdn as $i => $attr) {
+                        $attr = &$rdn[$i];
+                        if (is_array($attr['value'])) {
+                            foreach ($attr['value'] as $type => $v) {
+                                $type = array_search($type, $asn1->ANYmap, true);
+                                if ($type !== false && isset($asn1->stringTypeSize[$type])) {
+                                    $v = $asn1->convert($v, $type);
+                                    if ($v !== false) {
+                                        $v = preg_replace('/\s+/', ' ', $v);
+                                        $attr['value'] = strtolower(trim($v));
+                                        break;
+                                    }
+                                }
+                            }
+                        }
+                    }
+                    $result .= $asn1->encodeDER($rdn, $this->RelativeDistinguishedName);
+                }
+                return $result;
+            case FILE_X509_DN_HASH:
+                $dn = $this->getDN(FILE_X509_DN_CANON, $dn);
+                if (!class_exists('Crypt_Hash')) {
+                    include_once 'Crypt/Hash.php';
+                }
+                $hash = new Crypt_Hash('sha1');
+                $hash = $hash->hash($dn);
+                extract(unpack('Vhash', $hash));
+                return strtolower(bin2hex(pack('N', $hash)));
+        }
+
+        // Default is to return a string.
+        $start = true;
+        $output = '';
+        $result = array();
+        $asn1 = new File_ASN1();
+        $asn1->loadOIDs($this->oids);
+        $filters = array();
+        $filters['rdnSequence']['value'] = array('type' => FILE_ASN1_TYPE_UTF8_STRING);
+        $asn1->loadFilters($filters);
+        $this->_mapOutDNs($dn, 'rdnSequence', $asn1);
+        foreach ($dn['rdnSequence'] as $field) {
+            $prop = $field[0]['type'];
+            $value = $field[0]['value'];
+
+            $delim = ', ';
+            switch ($prop) {
+                case 'id-at-countryName':
+                    $desc = 'C';
+                    break;
+                case 'id-at-stateOrProvinceName':
+                    $desc = 'ST';
+                    break;
+                case 'id-at-organizationName':
+                    $desc = 'O';
+                    break;
+                case 'id-at-organizationalUnitName':
+                    $desc = 'OU';
+                    break;
+                case 'id-at-commonName':
+                    $desc = 'CN';
+                    break;
+                case 'id-at-localityName':
+                    $desc = 'L';
+                    break;
+                case 'id-at-surname':
+                    $desc = 'SN';
+                    break;
+                case 'id-at-uniqueIdentifier':
+                    $delim = '/';
+                    $desc = 'x500UniqueIdentifier';
+                    break;
+                case 'id-at-postalAddress':
+                    $delim = '/';
+                    $desc = 'postalAddress';
+                    break;
+                default:
+                    $delim = '/';
+                    $desc = preg_replace('#.+-([^-]+)$#', '$1', $prop);
+            }
+
+            if (!$start) {
+                $output.= $delim;
+            }
+            if (is_array($value)) {
+                foreach ($value as $type => $v) {
+                    $type = array_search($type, $asn1->ANYmap, true);
+                    if ($type !== false && isset($asn1->stringTypeSize[$type])) {
+                        $v = $asn1->convert($v, $type);
+                        if ($v !== false) {
+                            $value = $v;
+                            break;
+                        }
+                    }
+                }
+                if (is_array($value)) {
+                    $value = array_pop($value); // Always strip data type.
+                }
+            } elseif (is_object($value) && strtolower(get_class($value)) == 'file_asn1_element') {
+                // @codingStandardsIgnoreStart
+                $callback = version_compare(PHP_VERSION, '5.3.0') >= 0 ?
+                    function ($x) { return "\x" . bin2hex($x[0]); } :
+                    create_function('$x', 'return "\x" . bin2hex($x[0]);');
+                // @codingStandardsIgnoreEnd
+                $value = strtoupper(preg_replace_callback('#[^\x20-\x7E]#', $callback, $value->element));
+            }
+            $output.= $desc . '=' . $value;
+            $result[$desc] = isset($result[$desc]) ?
+                array_merge((array) $dn[$prop], array($value)) :
+                $value;
+            $start = false;
+        }
+
+        return $format == FILE_X509_DN_OPENSSL ? $result : $output;
+    }
+
+    /**
+     * Get the Distinguished Name for a certificate/crl issuer
+     *
+     * @param int $format optional
+     * @access public
+     * @return mixed
+     */
+    function getIssuerDN($format = FILE_X509_DN_ARRAY)
+    {
+        switch (true) {
+            case !isset($this->currentCert) || !is_array($this->currentCert):
+                break;
+            case isset($this->currentCert['tbsCertificate']):
+                return $this->getDN($format, $this->currentCert['tbsCertificate']['issuer']);
+            case isset($this->currentCert['tbsCertList']):
+                return $this->getDN($format, $this->currentCert['tbsCertList']['issuer']);
+        }
+
+        return false;
+    }
+
+    /**
+     * Get the Distinguished Name for a certificate/csr subject
+     * Alias of getDN()
+     *
+     * @param int $format optional
+     * @access public
+     * @return mixed
+     */
+    function getSubjectDN($format = FILE_X509_DN_ARRAY)
+    {
+        switch (true) {
+            case !empty($this->dn):
+                return $this->getDN($format);
+            case !isset($this->currentCert) || !is_array($this->currentCert):
+                break;
+            case isset($this->currentCert['tbsCertificate']):
+                return $this->getDN($format, $this->currentCert['tbsCertificate']['subject']);
+            case isset($this->currentCert['certificationRequestInfo']):
+                return $this->getDN($format, $this->currentCert['certificationRequestInfo']['subject']);
+        }
+
+        return false;
+    }
+
+    /**
+     * Get an individual Distinguished Name property for a certificate/crl issuer
+     *
+     * @param string $propName
+     * @param bool $withType optional
+     * @access public
+     * @return mixed
+     */
+    function getIssuerDNProp($propName, $withType = false)
+    {
+        switch (true) {
+            case !isset($this->currentCert) || !is_array($this->currentCert):
+                break;
+            case isset($this->currentCert['tbsCertificate']):
+                return $this->getDNProp($propName, $this->currentCert['tbsCertificate']['issuer'], $withType);
+            case isset($this->currentCert['tbsCertList']):
+                return $this->getDNProp($propName, $this->currentCert['tbsCertList']['issuer'], $withType);
+        }
+
+        return false;
+    }
+
+    /**
+     * Get an individual Distinguished Name property for a certificate/csr subject
+     *
+     * @param string $propName
+     * @param bool $withType optional
+     * @access public
+     * @return mixed
+     */
+    function getSubjectDNProp($propName, $withType = false)
+    {
+        switch (true) {
+            case !empty($this->dn):
+                return $this->getDNProp($propName, null, $withType);
+            case !isset($this->currentCert) || !is_array($this->currentCert):
+                break;
+            case isset($this->currentCert['tbsCertificate']):
+                return $this->getDNProp($propName, $this->currentCert['tbsCertificate']['subject'], $withType);
+            case isset($this->currentCert['certificationRequestInfo']):
+                return $this->getDNProp($propName, $this->currentCert['certificationRequestInfo']['subject'], $withType);
+        }
+
+        return false;
+    }
+
+    /**
+     * Get the certificate chain for the current cert
+     *
+     * @access public
+     * @return mixed
+     */
+    function getChain()
+    {
+        $chain = array($this->currentCert);
+
+        if (!is_array($this->currentCert) || !isset($this->currentCert['tbsCertificate'])) {
+            return false;
+        }
+        if (empty($this->CAs)) {
+            return $chain;
+        }
+        while (true) {
+            $currentCert = $chain[count($chain) - 1];
+            for ($i = 0; $i < count($this->CAs); $i++) {
+                $ca = $this->CAs[$i];
+                if ($currentCert['tbsCertificate']['issuer'] === $ca['tbsCertificate']['subject']) {
+                    $authorityKey = $this->getExtension('id-ce-authorityKeyIdentifier', $currentCert);
+                    $subjectKeyID = $this->getExtension('id-ce-subjectKeyIdentifier', $ca);
+                    switch (true) {
+                        case !is_array($authorityKey):
+                        case is_array($authorityKey) && isset($authorityKey['keyIdentifier']) && $authorityKey['keyIdentifier'] === $subjectKeyID:
+                            if ($currentCert === $ca) {
+                                break 3;
+                            }
+                            $chain[] = $ca;
+                            break 2;
+                    }
+                }
+            }
+            if ($i == count($this->CAs)) {
+                break;
+            }
+        }
+        foreach ($chain as $key => $value) {
+            $chain[$key] = new File_X509();
+            $chain[$key]->loadX509($value);
+        }
+        return $chain;
+    }
+
+    /**
+     * Set public key
+     *
+     * Key needs to be a Crypt_RSA object
+     *
+     * @param object $key
+     * @access public
+     * @return bool
+     */
+    function setPublicKey($key)
+    {
+        $key->setPublicKey();
+        $this->publicKey = $key;
+    }
+
+    /**
+     * Set private key
+     *
+     * Key needs to be a Crypt_RSA object
+     *
+     * @param object $key
+     * @access public
+     */
+    function setPrivateKey($key)
+    {
+        $this->privateKey = $key;
+    }
+
+    /**
+     * Set challenge
+     *
+     * Used for SPKAC CSR's
+     *
+     * @param string $challenge
+     * @access public
+     */
+    function setChallenge($challenge)
+    {
+        $this->challenge = $challenge;
+    }
+
+    /**
+     * Gets the public key
+     *
+     * Returns a Crypt_RSA object or a false.
+     *
+     * @access public
+     * @return mixed
+     */
+    function getPublicKey()
+    {
+        if (isset($this->publicKey)) {
+            return $this->publicKey;
+        }
+
+        if (isset($this->currentCert) && is_array($this->currentCert)) {
+            foreach (array('tbsCertificate/subjectPublicKeyInfo', 'certificationRequestInfo/subjectPKInfo') as $path) {
+                $keyinfo = $this->_subArray($this->currentCert, $path);
+                if (!empty($keyinfo)) {
+                    break;
+                }
+            }
+        }
+        if (empty($keyinfo)) {
+            return false;
+        }
+
+        $key = $keyinfo['subjectPublicKey'];
+
+        switch ($keyinfo['algorithm']['algorithm']) {
+            case 'rsaEncryption':
+                if (!class_exists('Crypt_RSA')) {
+                    include_once 'Crypt/RSA.php';
+                }
+                $publicKey = new Crypt_RSA();
+                $publicKey->loadKey($key);
+                $publicKey->setPublicKey();
+                break;
+            default:
+                return false;
+        }
+
+        return $publicKey;
+    }
+
+    /**
+     * Load a Certificate Signing Request
+     *
+     * @param string $csr
+     * @access public
+     * @return mixed
+     */
+    function loadCSR($csr, $mode = FILE_X509_FORMAT_AUTO_DETECT)
+    {
+        if (is_array($csr) && isset($csr['certificationRequestInfo'])) {
+            unset($this->currentCert);
+            unset($this->currentKeyIdentifier);
+            unset($this->signatureSubject);
+            $this->dn = $csr['certificationRequestInfo']['subject'];
+            if (!isset($this->dn)) {
+                return false;
+            }
+
+            $this->currentCert = $csr;
+            return $csr;
+        }
+
+        // see http://tools.ietf.org/html/rfc2986
+
+        $asn1 = new File_ASN1();
+
+        if ($mode != FILE_X509_FORMAT_DER) {
+            $newcsr = $this->_extractBER($csr);
+            if ($mode == FILE_X509_FORMAT_PEM && $csr == $newcsr) {
+                return false;
+            }
+            $csr = $newcsr;
+        }
+        $orig = $csr;
+
+        if ($csr === false) {
+            $this->currentCert = false;
+            return false;
+        }
+
+        $asn1->loadOIDs($this->oids);
+        $decoded = $asn1->decodeBER($csr);
+
+        if (empty($decoded)) {
+            $this->currentCert = false;
+            return false;
+        }
+
+        $csr = $asn1->asn1map($decoded[0], $this->CertificationRequest);
+        if (!isset($csr) || $csr === false) {
+            $this->currentCert = false;
+            return false;
+        }
+
+        $this->_mapInAttributes($csr, 'certificationRequestInfo/attributes', $asn1);
+        $this->_mapInDNs($csr, 'certificationRequestInfo/subject/rdnSequence', $asn1);
+
+        $this->dn = $csr['certificationRequestInfo']['subject'];
+
+        $this->signatureSubject = substr($orig, $decoded[0]['content'][0]['start'], $decoded[0]['content'][0]['length']);
+
+        $algorithm = &$csr['certificationRequestInfo']['subjectPKInfo']['algorithm']['algorithm'];
+        $key = &$csr['certificationRequestInfo']['subjectPKInfo']['subjectPublicKey'];
+        $key = $this->_reformatKey($algorithm, $key);
+
+        switch ($algorithm) {
+            case 'rsaEncryption':
+                if (!class_exists('Crypt_RSA')) {
+                    include_once 'Crypt/RSA.php';
+                }
+                $this->publicKey = new Crypt_RSA();
+                $this->publicKey->loadKey($key);
+                $this->publicKey->setPublicKey();
+                break;
+            default:
+                $this->publicKey = null;
+        }
+
+        $this->currentKeyIdentifier = null;
+        $this->currentCert = $csr;
+
+        return $csr;
+    }
+
+    /**
+     * Save CSR request
+     *
+     * @param array $csr
+     * @param int $format optional
+     * @access public
+     * @return string
+     */
+    function saveCSR($csr, $format = FILE_X509_FORMAT_PEM)
+    {
+        if (!is_array($csr) || !isset($csr['certificationRequestInfo'])) {
+            return false;
+        }
+
+        switch (true) {
+            case !($algorithm = $this->_subArray($csr, 'certificationRequestInfo/subjectPKInfo/algorithm/algorithm')):
+            case is_object($csr['certificationRequestInfo']['subjectPKInfo']['subjectPublicKey']):
+                break;
+            default:
+                switch ($algorithm) {
+                    case 'rsaEncryption':
+                        $csr['certificationRequestInfo']['subjectPKInfo']['subjectPublicKey']
+                            = base64_encode("\0" . base64_decode(preg_replace('#-.+-|[\r\n]#', '', $csr['certificationRequestInfo']['subjectPKInfo']['subjectPublicKey'])));
+                        $csr['certificationRequestInfo']['subjectPKInfo']['algorithm']['parameters'] = null;
+                        $csr['signatureAlgorithm']['parameters'] = null;
+                        $csr['certificationRequestInfo']['signature']['parameters'] = null;
+                }
+        }
+
+        $asn1 = new File_ASN1();
+
+        $asn1->loadOIDs($this->oids);
+
+        $filters = array();
+        $filters['certificationRequestInfo']['subject']['rdnSequence']['value']
+            = array('type' => FILE_ASN1_TYPE_UTF8_STRING);
+
+        $asn1->loadFilters($filters);
+
+        $this->_mapOutDNs($csr, 'certificationRequestInfo/subject/rdnSequence', $asn1);
+        $this->_mapOutAttributes($csr, 'certificationRequestInfo/attributes', $asn1);
+        $csr = $asn1->encodeDER($csr, $this->CertificationRequest);
+
+        switch ($format) {
+            case FILE_X509_FORMAT_DER:
+                return $csr;
+            // case FILE_X509_FORMAT_PEM:
+            default:
+                return "-----BEGIN CERTIFICATE REQUEST-----\r\n" . chunk_split(base64_encode($csr), 64) . '-----END CERTIFICATE REQUEST-----';
+        }
+    }
+
+    /**
+     * Load a SPKAC CSR
+     *
+     * SPKAC's are produced by the HTML5 keygen element:
+     *
+     * https://developer.mozilla.org/en-US/docs/HTML/Element/keygen
+     *
+     * @param string $csr
+     * @access public
+     * @return mixed
+     */
+    function loadSPKAC($spkac)
+    {
+        if (is_array($spkac) && isset($spkac['publicKeyAndChallenge'])) {
+            unset($this->currentCert);
+            unset($this->currentKeyIdentifier);
+            unset($this->signatureSubject);
+            $this->currentCert = $spkac;
+            return $spkac;
+        }
+
+        // see http://www.w3.org/html/wg/drafts/html/master/forms.html#signedpublickeyandchallenge
+
+        $asn1 = new File_ASN1();
+
+        // OpenSSL produces SPKAC's that are preceded by the string SPKAC=
+        $temp = preg_replace('#(?:SPKAC=)|[ \r\n\\\]#', '', $spkac);
+        $temp = preg_match('#^[a-zA-Z\d/+]*={0,2}$#', $temp) ? base64_decode($temp) : false;
+        if ($temp != false) {
+            $spkac = $temp;
+        }
+        $orig = $spkac;
+
+        if ($spkac === false) {
+            $this->currentCert = false;
+            return false;
+        }
+
+        $asn1->loadOIDs($this->oids);
+        $decoded = $asn1->decodeBER($spkac);
+
+        if (empty($decoded)) {
+            $this->currentCert = false;
+            return false;
+        }
+
+        $spkac = $asn1->asn1map($decoded[0], $this->SignedPublicKeyAndChallenge);
+
+        if (!isset($spkac) || $spkac === false) {
+            $this->currentCert = false;
+            return false;
+        }
+
+        $this->signatureSubject = substr($orig, $decoded[0]['content'][0]['start'], $decoded[0]['content'][0]['length']);
+
+        $algorithm = &$spkac['publicKeyAndChallenge']['spki']['algorithm']['algorithm'];
+        $key = &$spkac['publicKeyAndChallenge']['spki']['subjectPublicKey'];
+        $key = $this->_reformatKey($algorithm, $key);
+
+        switch ($algorithm) {
+            case 'rsaEncryption':
+                if (!class_exists('Crypt_RSA')) {
+                    include_once 'Crypt/RSA.php';
+                }
+                $this->publicKey = new Crypt_RSA();
+                $this->publicKey->loadKey($key);
+                $this->publicKey->setPublicKey();
+                break;
+            default:
+                $this->publicKey = null;
+        }
+
+        $this->currentKeyIdentifier = null;
+        $this->currentCert = $spkac;
+
+        return $spkac;
+    }
+
+    /**
+     * Save a SPKAC CSR request
+     *
+     * @param array $csr
+     * @param int $format optional
+     * @access public
+     * @return string
+     */
+    function saveSPKAC($spkac, $format = FILE_X509_FORMAT_PEM)
+    {
+        if (!is_array($spkac) || !isset($spkac['publicKeyAndChallenge'])) {
+            return false;
+        }
+
+        $algorithm = $this->_subArray($spkac, 'publicKeyAndChallenge/spki/algorithm/algorithm');
+        switch (true) {
+            case !$algorithm:
+            case is_object($spkac['publicKeyAndChallenge']['spki']['subjectPublicKey']):
+                break;
+            default:
+                switch ($algorithm) {
+                    case 'rsaEncryption':
+                        $spkac['publicKeyAndChallenge']['spki']['subjectPublicKey']
+                            = base64_encode("\0" . base64_decode(preg_replace('#-.+-|[\r\n]#', '', $spkac['publicKeyAndChallenge']['spki']['subjectPublicKey'])));
+                }
+        }
+
+        $asn1 = new File_ASN1();
+
+        $asn1->loadOIDs($this->oids);
+        $spkac = $asn1->encodeDER($spkac, $this->SignedPublicKeyAndChallenge);
+
+        switch ($format) {
+            case FILE_X509_FORMAT_DER:
+                return $spkac;
+            // case FILE_X509_FORMAT_PEM:
+            default:
+                // OpenSSL's implementation of SPKAC requires the SPKAC be preceded by SPKAC= and since there are pretty much
+                // no other SPKAC decoders phpseclib will use that same format
+                return 'SPKAC=' . base64_encode($spkac);
+        }
+    }
+
+    /**
+     * Load a Certificate Revocation List
+     *
+     * @param string $crl
+     * @access public
+     * @return mixed
+     */
+    function loadCRL($crl, $mode = FILE_X509_FORMAT_AUTO_DETECT)
+    {
+        if (is_array($crl) && isset($crl['tbsCertList'])) {
+            $this->currentCert = $crl;
+            unset($this->signatureSubject);
+            return $crl;
+        }
+
+        $asn1 = new File_ASN1();
+
+        if ($mode != FILE_X509_FORMAT_DER) {
+            $newcrl = $this->_extractBER($crl);
+            if ($mode == FILE_X509_FORMAT_PEM && $crl == $newcrl) {
+                return false;
+            }
+            $crl = $newcrl;
+        }
+        $orig = $crl;
+
+        if ($crl === false) {
+            $this->currentCert = false;
+            return false;
+        }
+
+        $asn1->loadOIDs($this->oids);
+        $decoded = $asn1->decodeBER($crl);
+
+        if (empty($decoded)) {
+            $this->currentCert = false;
+            return false;
+        }
+
+        $crl = $asn1->asn1map($decoded[0], $this->CertificateList);
+        if (!isset($crl) || $crl === false) {
+            $this->currentCert = false;
+            return false;
+        }
+
+        $this->signatureSubject = substr($orig, $decoded[0]['content'][0]['start'], $decoded[0]['content'][0]['length']);
+
+        $this->_mapInDNs($crl, 'tbsCertList/issuer/rdnSequence', $asn1);
+        if ($this->_isSubArrayValid($crl, 'tbsCertList/crlExtensions')) {
+            $this->_mapInExtensions($crl, 'tbsCertList/crlExtensions', $asn1);
+        }
+        if ($this->_isSubArrayValid($crl, 'tbsCertList/revokedCertificates')) {
+            $rclist_ref = &$this->_subArrayUnchecked($crl, 'tbsCertList/revokedCertificates');
+            if ($rclist_ref) {
+                $rclist = $crl['tbsCertList']['revokedCertificates'];
+                foreach ($rclist as $i => $extension) {
+                    if ($this->_isSubArrayValid($rclist, "$i/crlEntryExtensions", $asn1)) {
+                        $this->_mapInExtensions($rclist_ref, "$i/crlEntryExtensions", $asn1);
+                    }
+                }
+            }
+        }
+
+        $this->currentKeyIdentifier = null;
+        $this->currentCert = $crl;
+
+        return $crl;
+    }
+
+    /**
+     * Save Certificate Revocation List.
+     *
+     * @param array $crl
+     * @param int $format optional
+     * @access public
+     * @return string
+     */
+    function saveCRL($crl, $format = FILE_X509_FORMAT_PEM)
+    {
+        if (!is_array($crl) || !isset($crl['tbsCertList'])) {
+            return false;
+        }
+
+        $asn1 = new File_ASN1();
+
+        $asn1->loadOIDs($this->oids);
+
+        $filters = array();
+        $filters['tbsCertList']['issuer']['rdnSequence']['value']
+            = array('type' => FILE_ASN1_TYPE_UTF8_STRING);
+        $filters['tbsCertList']['signature']['parameters']
+            = array('type' => FILE_ASN1_TYPE_UTF8_STRING);
+        $filters['signatureAlgorithm']['parameters']
+            = array('type' => FILE_ASN1_TYPE_UTF8_STRING);
+
+        if (empty($crl['tbsCertList']['signature']['parameters'])) {
+            $filters['tbsCertList']['signature']['parameters']
+                = array('type' => FILE_ASN1_TYPE_NULL);
+        }
+
+        if (empty($crl['signatureAlgorithm']['parameters'])) {
+            $filters['signatureAlgorithm']['parameters']
+                = array('type' => FILE_ASN1_TYPE_NULL);
+        }
+
+        $asn1->loadFilters($filters);
+
+        $this->_mapOutDNs($crl, 'tbsCertList/issuer/rdnSequence', $asn1);
+        $this->_mapOutExtensions($crl, 'tbsCertList/crlExtensions', $asn1);
+        $rclist = &$this->_subArray($crl, 'tbsCertList/revokedCertificates');
+        if (is_array($rclist)) {
+            foreach ($rclist as $i => $extension) {
+                $this->_mapOutExtensions($rclist, "$i/crlEntryExtensions", $asn1);
+            }
+        }
+
+        $crl = $asn1->encodeDER($crl, $this->CertificateList);
+
+        switch ($format) {
+            case FILE_X509_FORMAT_DER:
+                return $crl;
+            // case FILE_X509_FORMAT_PEM:
+            default:
+                return "-----BEGIN X509 CRL-----\r\n" . chunk_split(base64_encode($crl), 64) . '-----END X509 CRL-----';
+        }
+    }
+
+    /**
+     * Helper function to build a time field according to RFC 3280 section
+     *  - 4.1.2.5 Validity
+     *  - 5.1.2.4 This Update
+     *  - 5.1.2.5 Next Update
+     *  - 5.1.2.6 Revoked Certificates
+     * by choosing utcTime iff year of date given is before 2050 and generalTime else.
+     *
+     * @param string $date in format date('D, d M Y H:i:s O')
+     * @access private
+     * @return array
+     */
+    function _timeField($date)
+    {
+        if (is_object($date) && strtolower(get_class($date)) == 'file_asn1_element') {
+            return $date;
+        }
+        if (!class_exists('DateTime')) {
+            $year = @gmdate("Y", @strtotime($date)); // the same way ASN1.php parses this
+        } else {
+            $dateObj = new DateTime($date, new DateTimeZone('GMT'));
+            $year = $dateObj->format('Y');
+        }
+        if ($year < 2050) {
+            return array('utcTime' => $date);
+        } else {
+            return array('generalTime' => $date);
+        }
+    }
+
+    /**
+     * Sign an X.509 certificate
+     *
+     * $issuer's private key needs to be loaded.
+     * $subject can be either an existing X.509 cert (if you want to resign it),
+     * a CSR or something with the DN and public key explicitly set.
+     *
+     * @param File_X509 $issuer
+     * @param File_X509 $subject
+     * @param string $signatureAlgorithm optional
+     * @access public
+     * @return mixed
+     */
+    function sign($issuer, $subject, $signatureAlgorithm = 'sha1WithRSAEncryption')
+    {
+        if (!is_object($issuer->privateKey) || empty($issuer->dn)) {
+            return false;
+        }
+
+        if (isset($subject->publicKey) && !($subjectPublicKey = $subject->_formatSubjectPublicKey())) {
+            return false;
+        }
+
+        $currentCert = isset($this->currentCert) ? $this->currentCert : null;
+        $signatureSubject = isset($this->signatureSubject) ? $this->signatureSubject: null;
+
+        if (isset($subject->currentCert) && is_array($subject->currentCert) && isset($subject->currentCert['tbsCertificate'])) {
+            $this->currentCert = $subject->currentCert;
+            $this->currentCert['tbsCertificate']['signature']['algorithm'] = $signatureAlgorithm;
+            $this->currentCert['signatureAlgorithm']['algorithm'] = $signatureAlgorithm;
+
+            if (!empty($this->startDate)) {
+                $this->currentCert['tbsCertificate']['validity']['notBefore'] = $this->_timeField($this->startDate);
+            }
+            if (!empty($this->endDate)) {
+                $this->currentCert['tbsCertificate']['validity']['notAfter'] = $this->_timeField($this->endDate);
+            }
+            if (!empty($this->serialNumber)) {
+                $this->currentCert['tbsCertificate']['serialNumber'] = $this->serialNumber;
+            }
+            if (!empty($subject->dn)) {
+                $this->currentCert['tbsCertificate']['subject'] = $subject->dn;
+            }
+            if (!empty($subject->publicKey)) {
+                $this->currentCert['tbsCertificate']['subjectPublicKeyInfo'] = $subjectPublicKey;
+            }
+            $this->removeExtension('id-ce-authorityKeyIdentifier');
+            if (isset($subject->domains)) {
+                $this->removeExtension('id-ce-subjectAltName');
+            }
+        } elseif (isset($subject->currentCert) && is_array($subject->currentCert) && isset($subject->currentCert['tbsCertList'])) {
+            return false;
+        } else {
+            if (!isset($subject->publicKey)) {
+                return false;
+            }
+
+            if (!class_exists('DateTime')) {
+                $startDate = !empty($this->startDate) ? $this->startDate : @date('D, d M Y H:i:s O');
+                $endDate = !empty($this->endDate) ? $this->endDate : @date('D, d M Y H:i:s O', strtotime('+1 year'));
+            } else {
+                $startDate = new DateTime('now', new DateTimeZone(@date_default_timezone_get()));
+                $startDate = !empty($this->startDate) ? $this->startDate : $startDate->format('D, d M Y H:i:s O');
+
+                $endDate = new DateTime('+1 year', new DateTimeZone(@date_default_timezone_get()));
+                $endDate = !empty($this->endDate) ? $this->endDate : $endDate->format('D, d M Y H:i:s O');
+            }
+            if (!empty($this->serialNumber)) {
+                $serialNumber = $this->serialNumber;
+            } else {
+                if (!function_exists('crypt_random_string')) {
+                    include_once 'Crypt/Random.php';
+                }
+                /* "The serial number MUST be a positive integer"
+                   "Conforming CAs MUST NOT use serialNumber values longer than 20 octets."
+                    -- https://tools.ietf.org/html/rfc5280#section-4.1.2.2
+
+                   for the integer to be positive the leading bit needs to be 0 hence the
+                   application of a bitmap
+                */
+                $serialNumber = new Math_BigInteger(crypt_random_string(20) & ("\x7F" . str_repeat("\xFF", 19)), 256);
+            }
+
+            $this->currentCert = array(
+                'tbsCertificate' =>
+                    array(
+                        'version' => 'v3',
+                        'serialNumber' => $serialNumber, // $this->setSerialNumber()
+                        'signature' => array('algorithm' => $signatureAlgorithm),
+                        'issuer' => false, // this is going to be overwritten later
+                        'validity' => array(
+                            'notBefore' => $this->_timeField($startDate), // $this->setStartDate()
+                            'notAfter' => $this->_timeField($endDate)   // $this->setEndDate()
+                        ),
+                        'subject' => $subject->dn,
+                        'subjectPublicKeyInfo' => $subjectPublicKey
+                    ),
+                    'signatureAlgorithm' => array('algorithm' => $signatureAlgorithm),
+                    'signature'          => false // this is going to be overwritten later
+            );
+
+            // Copy extensions from CSR.
+            $csrexts = $subject->getAttribute('pkcs-9-at-extensionRequest', 0);
+
+            if (!empty($csrexts)) {
+                $this->currentCert['tbsCertificate']['extensions'] = $csrexts;
+            }
+        }
+
+        $this->currentCert['tbsCertificate']['issuer'] = $issuer->dn;
+
+        if (isset($issuer->currentKeyIdentifier)) {
+            $this->setExtension('id-ce-authorityKeyIdentifier', array(
+                    //'authorityCertIssuer' => array(
+                    //    array(
+                    //        'directoryName' => $issuer->dn
+                    //    )
+                    //),
+                    'keyIdentifier' => $issuer->currentKeyIdentifier
+                ));
+            //$extensions = &$this->currentCert['tbsCertificate']['extensions'];
+            //if (isset($issuer->serialNumber)) {
+            //    $extensions[count($extensions) - 1]['authorityCertSerialNumber'] = $issuer->serialNumber;
+            //}
+            //unset($extensions);
+        }
+
+        if (isset($subject->currentKeyIdentifier)) {
+            $this->setExtension('id-ce-subjectKeyIdentifier', $subject->currentKeyIdentifier);
+        }
+
+        $altName = array();
+
+        if (isset($subject->domains) && count($subject->domains)) {
+            $altName = array_map(array('File_X509', '_dnsName'), $subject->domains);
+        }
+
+        if (isset($subject->ipAddresses) && count($subject->ipAddresses)) {
+            // should an IP address appear as the CN if no domain name is specified? idk
+            //$ips = count($subject->domains) ? $subject->ipAddresses : array_slice($subject->ipAddresses, 1);
+            $ipAddresses = array();
+            foreach ($subject->ipAddresses as $ipAddress) {
+                $encoded = $subject->_ipAddress($ipAddress);
+                if ($encoded !== false) {
+                    $ipAddresses[] = $encoded;
+                }
+            }
+            if (count($ipAddresses)) {
+                $altName = array_merge($altName, $ipAddresses);
+            }
+        }
+
+        if (!empty($altName)) {
+            $this->setExtension('id-ce-subjectAltName', $altName);
+        }
+
+        if ($this->caFlag) {
+            $keyUsage = $this->getExtension('id-ce-keyUsage');
+            if (!$keyUsage) {
+                $keyUsage = array();
+            }
+
+            $this->setExtension(
+                'id-ce-keyUsage',
+                array_values(array_unique(array_merge($keyUsage, array('cRLSign', 'keyCertSign'))))
+            );
+
+            $basicConstraints = $this->getExtension('id-ce-basicConstraints');
+            if (!$basicConstraints) {
+                $basicConstraints = array();
+            }
+
+            $this->setExtension(
+                'id-ce-basicConstraints',
+                array_unique(array_merge(array('cA' => true), $basicConstraints)),
+                true
+            );
+
+            if (!isset($subject->currentKeyIdentifier)) {
+                $this->setExtension('id-ce-subjectKeyIdentifier', base64_encode($this->computeKeyIdentifier($this->currentCert)), false, false);
+            }
+        }
+
+        // resync $this->signatureSubject
+        // save $tbsCertificate in case there are any File_ASN1_Element objects in it
+        $tbsCertificate = $this->currentCert['tbsCertificate'];
+        $this->loadX509($this->saveX509($this->currentCert));
+
+        $result = $this->_sign($issuer->privateKey, $signatureAlgorithm);
+        $result['tbsCertificate'] = $tbsCertificate;
+
+        $this->currentCert = $currentCert;
+        $this->signatureSubject = $signatureSubject;
+
+        return $result;
+    }
+
+    /**
+     * Sign a CSR
+     *
+     * @access public
+     * @return mixed
+     */
+    function signCSR($signatureAlgorithm = 'sha1WithRSAEncryption')
+    {
+        if (!is_object($this->privateKey) || empty($this->dn)) {
+            return false;
+        }
+
+        $origPublicKey = $this->publicKey;
+        $class = get_class($this->privateKey);
+        $this->publicKey = new $class();
+        $this->publicKey->loadKey($this->privateKey->getPublicKey());
+        $this->publicKey->setPublicKey();
+        if (!($publicKey = $this->_formatSubjectPublicKey())) {
+            return false;
+        }
+        $this->publicKey = $origPublicKey;
+
+        $currentCert = isset($this->currentCert) ? $this->currentCert : null;
+        $signatureSubject = isset($this->signatureSubject) ? $this->signatureSubject: null;
+
+        if (isset($this->currentCert) && is_array($this->currentCert) && isset($this->currentCert['certificationRequestInfo'])) {
+            $this->currentCert['signatureAlgorithm']['algorithm'] = $signatureAlgorithm;
+            if (!empty($this->dn)) {
+                $this->currentCert['certificationRequestInfo']['subject'] = $this->dn;
+            }
+            $this->currentCert['certificationRequestInfo']['subjectPKInfo'] = $publicKey;
+        } else {
+            $this->currentCert = array(
+                'certificationRequestInfo' =>
+                    array(
+                        'version' => 'v1',
+                        'subject' => $this->dn,
+                        'subjectPKInfo' => $publicKey
+                    ),
+                    'signatureAlgorithm' => array('algorithm' => $signatureAlgorithm),
+                    'signature'          => false // this is going to be overwritten later
+            );
+        }
+
+        // resync $this->signatureSubject
+        // save $certificationRequestInfo in case there are any File_ASN1_Element objects in it
+        $certificationRequestInfo = $this->currentCert['certificationRequestInfo'];
+        $this->loadCSR($this->saveCSR($this->currentCert));
+
+        $result = $this->_sign($this->privateKey, $signatureAlgorithm);
+        $result['certificationRequestInfo'] = $certificationRequestInfo;
+
+        $this->currentCert = $currentCert;
+        $this->signatureSubject = $signatureSubject;
+
+        return $result;
+    }
+
+    /**
+     * Sign a SPKAC
+     *
+     * @access public
+     * @return mixed
+     */
+    function signSPKAC($signatureAlgorithm = 'sha1WithRSAEncryption')
+    {
+        if (!is_object($this->privateKey)) {
+            return false;
+        }
+
+        $origPublicKey = $this->publicKey;
+        $class = get_class($this->privateKey);
+        $this->publicKey = new $class();
+        $this->publicKey->loadKey($this->privateKey->getPublicKey());
+        $this->publicKey->setPublicKey();
+        $publicKey = $this->_formatSubjectPublicKey();
+        if (!$publicKey) {
+            return false;
+        }
+        $this->publicKey = $origPublicKey;
+
+        $currentCert = isset($this->currentCert) ? $this->currentCert : null;
+        $signatureSubject = isset($this->signatureSubject) ? $this->signatureSubject: null;
+
+        // re-signing a SPKAC seems silly but since everything else supports re-signing why not?
+        if (isset($this->currentCert) && is_array($this->currentCert) && isset($this->currentCert['publicKeyAndChallenge'])) {
+            $this->currentCert['signatureAlgorithm']['algorithm'] = $signatureAlgorithm;
+            $this->currentCert['publicKeyAndChallenge']['spki'] = $publicKey;
+            if (!empty($this->challenge)) {
+                // the bitwise AND ensures that the output is a valid IA5String
+                $this->currentCert['publicKeyAndChallenge']['challenge'] = $this->challenge & str_repeat("\x7F", strlen($this->challenge));
+            }
+        } else {
+            $this->currentCert = array(
+                'publicKeyAndChallenge' =>
+                    array(
+                        'spki' => $publicKey,
+                        // quoting <https://developer.mozilla.org/en-US/docs/Web/HTML/Element/keygen>,
+                        // "A challenge string that is submitted along with the public key. Defaults to an empty string if not specified."
+                        // both Firefox and OpenSSL ("openssl spkac -key private.key") behave this way
+                        // we could alternatively do this instead if we ignored the specs:
+                        // crypt_random_string(8) & str_repeat("\x7F", 8)
+                        'challenge' => !empty($this->challenge) ? $this->challenge : ''
+                    ),
+                    'signatureAlgorithm' => array('algorithm' => $signatureAlgorithm),
+                    'signature'          => false // this is going to be overwritten later
+            );
+        }
+
+        // resync $this->signatureSubject
+        // save $publicKeyAndChallenge in case there are any File_ASN1_Element objects in it
+        $publicKeyAndChallenge = $this->currentCert['publicKeyAndChallenge'];
+        $this->loadSPKAC($this->saveSPKAC($this->currentCert));
+
+        $result = $this->_sign($this->privateKey, $signatureAlgorithm);
+        $result['publicKeyAndChallenge'] = $publicKeyAndChallenge;
+
+        $this->currentCert = $currentCert;
+        $this->signatureSubject = $signatureSubject;
+
+        return $result;
+    }
+
+    /**
+     * Sign a CRL
+     *
+     * $issuer's private key needs to be loaded.
+     *
+     * @param File_X509 $issuer
+     * @param File_X509 $crl
+     * @param string $signatureAlgorithm optional
+     * @access public
+     * @return mixed
+     */
+    function signCRL($issuer, $crl, $signatureAlgorithm = 'sha1WithRSAEncryption')
+    {
+        if (!is_object($issuer->privateKey) || empty($issuer->dn)) {
+            return false;
+        }
+
+        $currentCert = isset($this->currentCert) ? $this->currentCert : null;
+        $signatureSubject = isset($this->signatureSubject) ? $this->signatureSubject : null;
+        if (!class_exists('DateTime')) {
+            $thisUpdate = !empty($this->startDate) ? $this->startDate : @date('D, d M Y H:i:s O');
+        } else {
+            $thisUpdate = new DateTime('now', new DateTimeZone(@date_default_timezone_get()));
+            $thisUpdate = !empty($this->startDate) ? $this->startDate : $thisUpdate->format('D, d M Y H:i:s O');
+        }
+
+        if (isset($crl->currentCert) && is_array($crl->currentCert) && isset($crl->currentCert['tbsCertList'])) {
+            $this->currentCert = $crl->currentCert;
+            $this->currentCert['tbsCertList']['signature']['algorithm'] = $signatureAlgorithm;
+            $this->currentCert['signatureAlgorithm']['algorithm'] = $signatureAlgorithm;
+        } else {
+            $this->currentCert = array(
+                'tbsCertList' =>
+                    array(
+                        'version' => 'v2',
+                        'signature' => array('algorithm' => $signatureAlgorithm),
+                        'issuer' => false, // this is going to be overwritten later
+                        'thisUpdate' => $this->_timeField($thisUpdate) // $this->setStartDate()
+                    ),
+                    'signatureAlgorithm' => array('algorithm' => $signatureAlgorithm),
+                    'signature'          => false // this is going to be overwritten later
+            );
+        }
+
+        $tbsCertList = &$this->currentCert['tbsCertList'];
+        $tbsCertList['issuer'] = $issuer->dn;
+        $tbsCertList['thisUpdate'] = $this->_timeField($thisUpdate);
+
+        if (!empty($this->endDate)) {
+            $tbsCertList['nextUpdate'] = $this->_timeField($this->endDate); // $this->setEndDate()
+        } else {
+            unset($tbsCertList['nextUpdate']);
+        }
+
+        if (!empty($this->serialNumber)) {
+            $crlNumber = $this->serialNumber;
+        } else {
+            $crlNumber = $this->getExtension('id-ce-cRLNumber');
+            // "The CRL number is a non-critical CRL extension that conveys a
+            //  monotonically increasing sequence number for a given CRL scope and
+            //  CRL issuer.  This extension allows users to easily determine when a
+            //  particular CRL supersedes another CRL."
+            // -- https://tools.ietf.org/html/rfc5280#section-5.2.3
+            $crlNumber = $crlNumber !== false ? $crlNumber->add(new Math_BigInteger(1)) : null;
+        }
+
+        $this->removeExtension('id-ce-authorityKeyIdentifier');
+        $this->removeExtension('id-ce-issuerAltName');
+
+        // Be sure version >= v2 if some extension found.
+        $version = isset($tbsCertList['version']) ? $tbsCertList['version'] : 0;
+        if (!$version) {
+            if (!empty($tbsCertList['crlExtensions'])) {
+                $version = 1; // v2.
+            } elseif (!empty($tbsCertList['revokedCertificates'])) {
+                foreach ($tbsCertList['revokedCertificates'] as $cert) {
+                    if (!empty($cert['crlEntryExtensions'])) {
+                        $version = 1; // v2.
+                    }
+                }
+            }
+
+            if ($version) {
+                $tbsCertList['version'] = $version;
+            }
+        }
+
+        // Store additional extensions.
+        if (!empty($tbsCertList['version'])) { // At least v2.
+            if (!empty($crlNumber)) {
+                $this->setExtension('id-ce-cRLNumber', $crlNumber);
+            }
+
+            if (isset($issuer->currentKeyIdentifier)) {
+                $this->setExtension('id-ce-authorityKeyIdentifier', array(
+                        //'authorityCertIssuer' => array(
+                        //    array(
+                        //        'directoryName' => $issuer->dn
+                        //    )
+                        //),
+                        'keyIdentifier' => $issuer->currentKeyIdentifier
+                    ));
+                //$extensions = &$tbsCertList['crlExtensions'];
+                //if (isset($issuer->serialNumber)) {
+                //    $extensions[count($extensions) - 1]['authorityCertSerialNumber'] = $issuer->serialNumber;
+                //}
+                //unset($extensions);
+            }
+
+            $issuerAltName = $this->getExtension('id-ce-subjectAltName', $issuer->currentCert);
+
+            if ($issuerAltName !== false) {
+                $this->setExtension('id-ce-issuerAltName', $issuerAltName);
+            }
+        }
+
+        if (empty($tbsCertList['revokedCertificates'])) {
+            unset($tbsCertList['revokedCertificates']);
+        }
+
+        unset($tbsCertList);
+
+        // resync $this->signatureSubject
+        // save $tbsCertList in case there are any File_ASN1_Element objects in it
+        $tbsCertList = $this->currentCert['tbsCertList'];
+        $this->loadCRL($this->saveCRL($this->currentCert));
+
+        $result = $this->_sign($issuer->privateKey, $signatureAlgorithm);
+        $result['tbsCertList'] = $tbsCertList;
+
+        $this->currentCert = $currentCert;
+        $this->signatureSubject = $signatureSubject;
+
+        return $result;
+    }
+
+    /**
+     * X.509 certificate signing helper function.
+     *
+     * @param object $key
+     * @param File_X509 $subject
+     * @param string $signatureAlgorithm
+     * @access public
+     * @return mixed
+     */
+    function _sign($key, $signatureAlgorithm)
+    {
+        switch (strtolower(get_class($key))) {
+            case 'crypt_rsa':
+                switch ($signatureAlgorithm) {
+                    case 'md2WithRSAEncryption':
+                    case 'md5WithRSAEncryption':
+                    case 'sha1WithRSAEncryption':
+                    case 'sha224WithRSAEncryption':
+                    case 'sha256WithRSAEncryption':
+                    case 'sha384WithRSAEncryption':
+                    case 'sha512WithRSAEncryption':
+                        $key->setHash(preg_replace('#WithRSAEncryption$#', '', $signatureAlgorithm));
+                        $key->setSignatureMode(CRYPT_RSA_SIGNATURE_PKCS1);
+
+                        $this->currentCert['signature'] = base64_encode("\0" . $key->sign($this->signatureSubject));
+                        return $this->currentCert;
+                }
+            default:
+                return false;
+        }
+    }
+
+    /**
+     * Set certificate start date
+     *
+     * @param string $date
+     * @access public
+     */
+    function setStartDate($date)
+    {
+        if (class_exists('DateTime')) {
+            $date = new DateTime($date, new DateTimeZone(@date_default_timezone_get()));
+            $this->startDate = $date->format('D, d M Y H:i:s O');
+        } else {
+            $this->startDate = @date('D, d M Y H:i:s O', @strtotime($date));
+        }
+    }
+
+    /**
+     * Set certificate end date
+     *
+     * @param string $date
+     * @access public
+     */
+    function setEndDate($date)
+    {
+        /*
+          To indicate that a certificate has no well-defined expiration date,
+          the notAfter SHOULD be assigned the GeneralizedTime value of
+          99991231235959Z.
+
+          -- http://tools.ietf.org/html/rfc5280#section-4.1.2.5
+        */
+        if (strtolower($date) == 'lifetime') {
+            $temp = '99991231235959Z';
+            $asn1 = new File_ASN1();
+            $temp = chr(FILE_ASN1_TYPE_GENERALIZED_TIME) . $asn1->_encodeLength(strlen($temp)) . $temp;
+            $this->endDate = new File_ASN1_Element($temp);
+        } else {
+            if (class_exists('DateTime')) {
+                $date = new DateTime($date, new DateTimeZone(@date_default_timezone_get()));
+                $this->endDate = $date->format('D, d M Y H:i:s O');
+            } else {
+                $this->endDate = @date('D, d M Y H:i:s O', @strtotime($date));
+            }
+        }
+    }
+
+    /**
+     * Set Serial Number
+     *
+     * @param string $serial
+     * @param $base optional
+     * @access public
+     */
+    function setSerialNumber($serial, $base = -256)
+    {
+        $this->serialNumber = new Math_BigInteger($serial, $base);
+    }
+
+    /**
+     * Turns the certificate into a certificate authority
+     *
+     * @access public
+     */
+    function makeCA()
+    {
+        $this->caFlag = true;
+    }
+
+    /**
+     * Check for validity of subarray
+     *
+     * This is intended for use in conjunction with _subArrayUnchecked(),
+     * implementing the checks included in _subArray() but without copying
+     * a potentially large array by passing its reference by-value to is_array().
+     *
+     * @param array $root
+     * @param string $path
+     * @return boolean
+     * @access private
+     */
+    function _isSubArrayValid($root, $path)
+    {
+        if (!is_array($root)) {
+            return false;
+        }
+
+        foreach (explode('/', $path) as $i) {
+            if (!is_array($root)) {
+                return false;
+            }
+
+            if (!isset($root[$i])) {
+                return true;
+            }
+
+            $root = $root[$i];
+        }
+
+        return true;
+    }
+
+    /**
+     * Get a reference to a subarray
+     *
+     * This variant of _subArray() does no is_array() checking,
+     * so $root should be checked with _isSubArrayValid() first.
+     *
+     * This is here for performance reasons:
+     * Passing a reference (i.e. $root) by-value (i.e. to is_array())
+     * creates a copy. If $root is an especially large array, this is expensive.
+     *
+     * @param array $root
+     * @param string $path  absolute path with / as component separator
+     * @param bool $create optional
+     * @access private
+     * @return array|false
+     */
+    function &_subArrayUnchecked(&$root, $path, $create = false)
+    {
+        $false = false;
+
+        foreach (explode('/', $path) as $i) {
+            if (!isset($root[$i])) {
+                if (!$create) {
+                    return $false;
+                }
+
+                $root[$i] = array();
+            }
+
+            $root = &$root[$i];
+        }
+
+        return $root;
+    }
+
+    /**
+     * Get a reference to a subarray
+     *
+     * @param array $root
+     * @param string $path  absolute path with / as component separator
+     * @param bool $create optional
+     * @access private
+     * @return array|false
+     */
+    function &_subArray(&$root, $path, $create = false)
+    {
+        $false = false;
+
+        if (!is_array($root)) {
+            return $false;
+        }
+
+        foreach (explode('/', $path) as $i) {
+            if (!is_array($root)) {
+                return $false;
+            }
+
+            if (!isset($root[$i])) {
+                if (!$create) {
+                    return $false;
+                }
+
+                $root[$i] = array();
+            }
+
+            $root = &$root[$i];
+        }
+
+        return $root;
+    }
+
+    /**
+     * Get a reference to an extension subarray
+     *
+     * @param array $root
+     * @param string $path optional absolute path with / as component separator
+     * @param bool $create optional
+     * @access private
+     * @return array|false
+     */
+    function &_extensions(&$root, $path = null, $create = false)
+    {
+        if (!isset($root)) {
+            $root = $this->currentCert;
+        }
+
+        switch (true) {
+            case !empty($path):
+            case !is_array($root):
+                break;
+            case isset($root['tbsCertificate']):
+                $path = 'tbsCertificate/extensions';
+                break;
+            case isset($root['tbsCertList']):
+                $path = 'tbsCertList/crlExtensions';
+                break;
+            case isset($root['certificationRequestInfo']):
+                $pth = 'certificationRequestInfo/attributes';
+                $attributes = &$this->_subArray($root, $pth, $create);
+
+                if (is_array($attributes)) {
+                    foreach ($attributes as $key => $value) {
+                        if ($value['type'] == 'pkcs-9-at-extensionRequest') {
+                            $path = "$pth/$key/value/0";
+                            break 2;
+                        }
+                    }
+                    if ($create) {
+                        $key = count($attributes);
+                        $attributes[] = array('type' => 'pkcs-9-at-extensionRequest', 'value' => array());
+                        $path = "$pth/$key/value/0";
+                    }
+                }
+                break;
+        }
+
+        $extensions = &$this->_subArray($root, $path, $create);
+
+        if (!is_array($extensions)) {
+            $false = false;
+            return $false;
+        }
+
+        return $extensions;
+    }
+
+    /**
+     * Remove an Extension
+     *
+     * @param string $id
+     * @param string $path optional
+     * @access private
+     * @return bool
+     */
+    function _removeExtension($id, $path = null)
+    {
+        $extensions = &$this->_extensions($this->currentCert, $path);
+
+        if (!is_array($extensions)) {
+            return false;
+        }
+
+        $result = false;
+        foreach ($extensions as $key => $value) {
+            if ($value['extnId'] == $id) {
+                unset($extensions[$key]);
+                $result = true;
+            }
+        }
+
+        $extensions = array_values($extensions);
+        // fix for https://bugs.php.net/75433 affecting PHP 7.2
+        if (!isset($extensions[0])) {
+            $extensions = array_splice($extensions, 0, 0);
+        }
+        return $result;
+    }
+
+    /**
+     * Get an Extension
+     *
+     * Returns the extension if it exists and false if not
+     *
+     * @param string $id
+     * @param array $cert optional
+     * @param string $path optional
+     * @access private
+     * @return mixed
+     */
+    function _getExtension($id, $cert = null, $path = null)
+    {
+        $extensions = $this->_extensions($cert, $path);
+
+        if (!is_array($extensions)) {
+            return false;
+        }
+
+        foreach ($extensions as $key => $value) {
+            if ($value['extnId'] == $id) {
+                return $value['extnValue'];
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Returns a list of all extensions in use
+     *
+     * @param array $cert optional
+     * @param string $path optional
+     * @access private
+     * @return array
+     */
+    function _getExtensions($cert = null, $path = null)
+    {
+        $exts = $this->_extensions($cert, $path);
+        $extensions = array();
+
+        if (is_array($exts)) {
+            foreach ($exts as $extension) {
+                $extensions[] = $extension['extnId'];
+            }
+        }
+
+        return $extensions;
+    }
+
+    /**
+     * Set an Extension
+     *
+     * @param string $id
+     * @param mixed $value
+     * @param bool $critical optional
+     * @param bool $replace optional
+     * @param string $path optional
+     * @access private
+     * @return bool
+     */
+    function _setExtension($id, $value, $critical = false, $replace = true, $path = null)
+    {
+        $extensions = &$this->_extensions($this->currentCert, $path, true);
+
+        if (!is_array($extensions)) {
+            return false;
+        }
+
+        $newext = array('extnId'  => $id, 'critical' => $critical, 'extnValue' => $value);
+
+        foreach ($extensions as $key => $value) {
+            if ($value['extnId'] == $id) {
+                if (!$replace) {
+                    return false;
+                }
+
+                $extensions[$key] = $newext;
+                return true;
+            }
+        }
+
+        $extensions[] = $newext;
+        return true;
+    }
+
+    /**
+     * Remove a certificate, CSR or CRL Extension
+     *
+     * @param string $id
+     * @access public
+     * @return bool
+     */
+    function removeExtension($id)
+    {
+        return $this->_removeExtension($id);
+    }
+
+    /**
+     * Get a certificate, CSR or CRL Extension
+     *
+     * Returns the extension if it exists and false if not
+     *
+     * @param string $id
+     * @param array $cert optional
+     * @access public
+     * @return mixed
+     */
+    function getExtension($id, $cert = null)
+    {
+        return $this->_getExtension($id, $cert);
+    }
+
+    /**
+     * Returns a list of all extensions in use in certificate, CSR or CRL
+     *
+     * @param array $cert optional
+     * @access public
+     * @return array
+     */
+    function getExtensions($cert = null)
+    {
+        return $this->_getExtensions($cert);
+    }
+
+    /**
+     * Set a certificate, CSR or CRL Extension
+     *
+     * @param string $id
+     * @param mixed $value
+     * @param bool $critical optional
+     * @param bool $replace optional
+     * @access public
+     * @return bool
+     */
+    function setExtension($id, $value, $critical = false, $replace = true)
+    {
+        return $this->_setExtension($id, $value, $critical, $replace);
+    }
+
+    /**
+     * Remove a CSR attribute.
+     *
+     * @param string $id
+     * @param int $disposition optional
+     * @access public
+     * @return bool
+     */
+    function removeAttribute($id, $disposition = FILE_X509_ATTR_ALL)
+    {
+        $attributes = &$this->_subArray($this->currentCert, 'certificationRequestInfo/attributes');
+
+        if (!is_array($attributes)) {
+            return false;
+        }
+
+        $result = false;
+        foreach ($attributes as $key => $attribute) {
+            if ($attribute['type'] == $id) {
+                $n = count($attribute['value']);
+                switch (true) {
+                    case $disposition == FILE_X509_ATTR_APPEND:
+                    case $disposition == FILE_X509_ATTR_REPLACE:
+                        return false;
+                    case $disposition >= $n:
+                        $disposition -= $n;
+                        break;
+                    case $disposition == FILE_X509_ATTR_ALL:
+                    case $n == 1:
+                        unset($attributes[$key]);
+                        $result = true;
+                        break;
+                    default:
+                        unset($attributes[$key]['value'][$disposition]);
+                        $attributes[$key]['value'] = array_values($attributes[$key]['value']);
+                        $result = true;
+                        break;
+                }
+                if ($result && $disposition != FILE_X509_ATTR_ALL) {
+                    break;
+                }
+            }
+        }
+
+        $attributes = array_values($attributes);
+        return $result;
+    }
+
+    /**
+     * Get a CSR attribute
+     *
+     * Returns the attribute if it exists and false if not
+     *
+     * @param string $id
+     * @param int $disposition optional
+     * @param array $csr optional
+     * @access public
+     * @return mixed
+     */
+    function getAttribute($id, $disposition = FILE_X509_ATTR_ALL, $csr = null)
+    {
+        if (empty($csr)) {
+            $csr = $this->currentCert;
+        }
+
+        $attributes = $this->_subArray($csr, 'certificationRequestInfo/attributes');
+
+        if (!is_array($attributes)) {
+            return false;
+        }
+
+        foreach ($attributes as $key => $attribute) {
+            if ($attribute['type'] == $id) {
+                $n = count($attribute['value']);
+                switch (true) {
+                    case $disposition == FILE_X509_ATTR_APPEND:
+                    case $disposition == FILE_X509_ATTR_REPLACE:
+                        return false;
+                    case $disposition == FILE_X509_ATTR_ALL:
+                        return $attribute['value'];
+                    case $disposition >= $n:
+                        $disposition -= $n;
+                        break;
+                    default:
+                        return $attribute['value'][$disposition];
+                }
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Returns a list of all CSR attributes in use
+     *
+     * @param array $csr optional
+     * @access public
+     * @return array
+     */
+    function getAttributes($csr = null)
+    {
+        if (empty($csr)) {
+            $csr = $this->currentCert;
+        }
+
+        $attributes = $this->_subArray($csr, 'certificationRequestInfo/attributes');
+        $attrs = array();
+
+        if (is_array($attributes)) {
+            foreach ($attributes as $attribute) {
+                $attrs[] = $attribute['type'];
+            }
+        }
+
+        return $attrs;
+    }
+
+    /**
+     * Set a CSR attribute
+     *
+     * @param string $id
+     * @param mixed $value
+     * @param bool $disposition optional
+     * @access public
+     * @return bool
+     */
+    function setAttribute($id, $value, $disposition = FILE_X509_ATTR_ALL)
+    {
+        $attributes = &$this->_subArray($this->currentCert, 'certificationRequestInfo/attributes', true);
+
+        if (!is_array($attributes)) {
+            return false;
+        }
+
+        switch ($disposition) {
+            case FILE_X509_ATTR_REPLACE:
+                $disposition = FILE_X509_ATTR_APPEND;
+            case FILE_X509_ATTR_ALL:
+                $this->removeAttribute($id);
+                break;
+        }
+
+        foreach ($attributes as $key => $attribute) {
+            if ($attribute['type'] == $id) {
+                $n = count($attribute['value']);
+                switch (true) {
+                    case $disposition == FILE_X509_ATTR_APPEND:
+                        $last = $key;
+                        break;
+                    case $disposition >= $n:
+                        $disposition -= $n;
+                        break;
+                    default:
+                        $attributes[$key]['value'][$disposition] = $value;
+                        return true;
+                }
+            }
+        }
+
+        switch (true) {
+            case $disposition >= 0:
+                return false;
+            case isset($last):
+                $attributes[$last]['value'][] = $value;
+                break;
+            default:
+                $attributes[] = array('type' => $id, 'value' => $disposition == FILE_X509_ATTR_ALL ? $value: array($value));
+                break;
+        }
+
+        return true;
+    }
+
+    /**
+     * Sets the subject key identifier
+     *
+     * This is used by the id-ce-authorityKeyIdentifier and the id-ce-subjectKeyIdentifier extensions.
+     *
+     * @param string $value
+     * @access public
+     */
+    function setKeyIdentifier($value)
+    {
+        if (empty($value)) {
+            unset($this->currentKeyIdentifier);
+        } else {
+            $this->currentKeyIdentifier = base64_encode($value);
+        }
+    }
+
+    /**
+     * Compute a public key identifier.
+     *
+     * Although key identifiers may be set to any unique value, this function
+     * computes key identifiers from public key according to the two
+     * recommended methods (4.2.1.2 RFC 3280).
+     * Highly polymorphic: try to accept all possible forms of key:
+     * - Key object
+     * - File_X509 object with public or private key defined
+     * - Certificate or CSR array
+     * - File_ASN1_Element object
+     * - PEM or DER string
+     *
+     * @param mixed $key optional
+     * @param int $method optional
+     * @access public
+     * @return string binary key identifier
+     */
+    function computeKeyIdentifier($key = null, $method = 1)
+    {
+        if (is_null($key)) {
+            $key = $this;
+        }
+
+        switch (true) {
+            case is_string($key):
+                break;
+            case is_array($key) && isset($key['tbsCertificate']['subjectPublicKeyInfo']['subjectPublicKey']):
+                return $this->computeKeyIdentifier($key['tbsCertificate']['subjectPublicKeyInfo']['subjectPublicKey'], $method);
+            case is_array($key) && isset($key['certificationRequestInfo']['subjectPKInfo']['subjectPublicKey']):
+                return $this->computeKeyIdentifier($key['certificationRequestInfo']['subjectPKInfo']['subjectPublicKey'], $method);
+            case !is_object($key):
+                return false;
+            case strtolower(get_class($key)) == 'file_asn1_element':
+                // Assume the element is a bitstring-packed key.
+                $asn1 = new File_ASN1();
+                $decoded = $asn1->decodeBER($key->element);
+                if (empty($decoded)) {
+                    return false;
+                }
+                $raw = $asn1->asn1map($decoded[0], array('type' => FILE_ASN1_TYPE_BIT_STRING));
+                if (empty($raw)) {
+                    return false;
+                }
+                $raw = base64_decode($raw);
+                // If the key is private, compute identifier from its corresponding public key.
+                if (!class_exists('Crypt_RSA')) {
+                    include_once 'Crypt/RSA.php';
+                }
+                $key = new Crypt_RSA();
+                if (!$key->loadKey($raw)) {
+                    return false;   // Not an unencrypted RSA key.
+                }
+                if ($key->getPrivateKey() !== false) {  // If private.
+                    return $this->computeKeyIdentifier($key, $method);
+                }
+                $key = $raw;    // Is a public key.
+                break;
+            case strtolower(get_class($key)) == 'file_x509':
+                if (isset($key->publicKey)) {
+                    return $this->computeKeyIdentifier($key->publicKey, $method);
+                }
+                if (isset($key->privateKey)) {
+                    return $this->computeKeyIdentifier($key->privateKey, $method);
+                }
+                if (isset($key->currentCert['tbsCertificate']) || isset($key->currentCert['certificationRequestInfo'])) {
+                    return $this->computeKeyIdentifier($key->currentCert, $method);
+                }
+                return false;
+            default: // Should be a key object (i.e.: Crypt_RSA).
+                $key = $key->getPublicKey(CRYPT_RSA_PUBLIC_FORMAT_PKCS1);
+                break;
+        }
+
+        // If in PEM format, convert to binary.
+        $key = $this->_extractBER($key);
+
+        // Now we have the key string: compute its sha-1 sum.
+        if (!class_exists('Crypt_Hash')) {
+            include_once 'Crypt/Hash.php';
+        }
+        $hash = new Crypt_Hash('sha1');
+        $hash = $hash->hash($key);
+
+        if ($method == 2) {
+            $hash = substr($hash, -8);
+            $hash[0] = chr((ord($hash[0]) & 0x0F) | 0x40);
+        }
+
+        return $hash;
+    }
+
+    /**
+     * Format a public key as appropriate
+     *
+     * @access private
+     * @return array
+     */
+    function _formatSubjectPublicKey()
+    {
+        if (!isset($this->publicKey) || !is_object($this->publicKey)) {
+            return false;
+        }
+
+        switch (strtolower(get_class($this->publicKey))) {
+            case 'crypt_rsa':
+                // the following two return statements do the same thing. i dunno.. i just prefer the later for some reason.
+                // the former is a good example of how to do fuzzing on the public key
+                //return new File_ASN1_Element(base64_decode(preg_replace('#-.+-|[\r\n]#', '', $this->publicKey->getPublicKey())));
+                return array(
+                    'algorithm' => array('algorithm' => 'rsaEncryption'),
+                    'subjectPublicKey' => $this->publicKey->getPublicKey(CRYPT_RSA_PUBLIC_FORMAT_PKCS1)
+                );
+            default:
+                return false;
+        }
+    }
+
+    /**
+     * Set the domain name's which the cert is to be valid for
+     *
+     * @access public
+     * @return array
+     */
+    function setDomain()
+    {
+        $this->domains = func_get_args();
+        $this->removeDNProp('id-at-commonName');
+        $this->setDNProp('id-at-commonName', $this->domains[0]);
+    }
+
+    /**
+     * Set the IP Addresses's which the cert is to be valid for
+     *
+     * @access public
+     * @param string $ipAddress optional
+     */
+    function setIPAddress()
+    {
+        $this->ipAddresses = func_get_args();
+        /*
+        if (!isset($this->domains)) {
+            $this->removeDNProp('id-at-commonName');
+            $this->setDNProp('id-at-commonName', $this->ipAddresses[0]);
+        }
+        */
+    }
+
+    /**
+     * Helper function to build domain array
+     *
+     * @access private
+     * @param string $domain
+     * @return array
+     */
+    function _dnsName($domain)
+    {
+        return array('dNSName' => $domain);
+    }
+
+    /**
+     * Helper function to build IP Address array
+     *
+     * (IPv6 is not currently supported)
+     *
+     * @access private
+     * @param string $address
+     * @return array
+     */
+    function _iPAddress($address)
+    {
+        return array('iPAddress' => $address);
+    }
+
+    /**
+     * Get the index of a revoked certificate.
+     *
+     * @param array $rclist
+     * @param string $serial
+     * @param bool $create optional
+     * @access private
+     * @return int|false
+     */
+    function _revokedCertificate(&$rclist, $serial, $create = false)
+    {
+        $serial = new Math_BigInteger($serial);
+
+        foreach ($rclist as $i => $rc) {
+            if (!($serial->compare($rc['userCertificate']))) {
+                return $i;
+            }
+        }
+
+        if (!$create) {
+            return false;
+        }
+
+        if (!class_exists('DateTime')) {
+            $revocationDate = @date('D, d M Y H:i:s O');
+        } else {
+            $revocationDate = new DateTime('now', new DateTimeZone(@date_default_timezone_get()));
+            $revocationDate = $revocationDate->format('D, d M Y H:i:s O');
+        }
+
+        $i = count($rclist);
+        $rclist[] = array('userCertificate' => $serial,
+                          'revocationDate'  => $this->_timeField($revocationDate));
+        return $i;
+    }
+
+    /**
+     * Revoke a certificate.
+     *
+     * @param string $serial
+     * @param string $date optional
+     * @access public
+     * @return bool
+     */
+    function revoke($serial, $date = null)
+    {
+        if (isset($this->currentCert['tbsCertList'])) {
+            if (is_array($rclist = &$this->_subArray($this->currentCert, 'tbsCertList/revokedCertificates', true))) {
+                if ($this->_revokedCertificate($rclist, $serial) === false) { // If not yet revoked
+                    if (($i = $this->_revokedCertificate($rclist, $serial, true)) !== false) {
+                        if (!empty($date)) {
+                            $rclist[$i]['revocationDate'] = $this->_timeField($date);
+                        }
+
+                        return true;
+                    }
+                }
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Unrevoke a certificate.
+     *
+     * @param string $serial
+     * @access public
+     * @return bool
+     */
+    function unrevoke($serial)
+    {
+        if (is_array($rclist = &$this->_subArray($this->currentCert, 'tbsCertList/revokedCertificates'))) {
+            if (($i = $this->_revokedCertificate($rclist, $serial)) !== false) {
+                unset($rclist[$i]);
+                $rclist = array_values($rclist);
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Get a revoked certificate.
+     *
+     * @param string $serial
+     * @access public
+     * @return mixed
+     */
+    function getRevoked($serial)
+    {
+        if (is_array($rclist = $this->_subArray($this->currentCert, 'tbsCertList/revokedCertificates'))) {
+            if (($i = $this->_revokedCertificate($rclist, $serial)) !== false) {
+                return $rclist[$i];
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * List revoked certificates
+     *
+     * @param array $crl optional
+     * @access public
+     * @return array
+     */
+    function listRevoked($crl = null)
+    {
+        if (!isset($crl)) {
+            $crl = $this->currentCert;
+        }
+
+        if (!isset($crl['tbsCertList'])) {
+            return false;
+        }
+
+        $result = array();
+
+        if (is_array($rclist = $this->_subArray($crl, 'tbsCertList/revokedCertificates'))) {
+            foreach ($rclist as $rc) {
+                $result[] = $rc['userCertificate']->toString();
+            }
+        }
+
+        return $result;
+    }
+
+    /**
+     * Remove a Revoked Certificate Extension
+     *
+     * @param string $serial
+     * @param string $id
+     * @access public
+     * @return bool
+     */
+    function removeRevokedCertificateExtension($serial, $id)
+    {
+        if (is_array($rclist = &$this->_subArray($this->currentCert, 'tbsCertList/revokedCertificates'))) {
+            if (($i = $this->_revokedCertificate($rclist, $serial)) !== false) {
+                return $this->_removeExtension($id, "tbsCertList/revokedCertificates/$i/crlEntryExtensions");
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Get a Revoked Certificate Extension
+     *
+     * Returns the extension if it exists and false if not
+     *
+     * @param string $serial
+     * @param string $id
+     * @param array $crl optional
+     * @access public
+     * @return mixed
+     */
+    function getRevokedCertificateExtension($serial, $id, $crl = null)
+    {
+        if (!isset($crl)) {
+            $crl = $this->currentCert;
+        }
+
+        if (is_array($rclist = $this->_subArray($crl, 'tbsCertList/revokedCertificates'))) {
+            if (($i = $this->_revokedCertificate($rclist, $serial)) !== false) {
+                return $this->_getExtension($id, $crl, "tbsCertList/revokedCertificates/$i/crlEntryExtensions");
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Returns a list of all extensions in use for a given revoked certificate
+     *
+     * @param string $serial
+     * @param array $crl optional
+     * @access public
+     * @return array
+     */
+    function getRevokedCertificateExtensions($serial, $crl = null)
+    {
+        if (!isset($crl)) {
+            $crl = $this->currentCert;
+        }
+
+        if (is_array($rclist = $this->_subArray($crl, 'tbsCertList/revokedCertificates'))) {
+            if (($i = $this->_revokedCertificate($rclist, $serial)) !== false) {
+                return $this->_getExtensions($crl, "tbsCertList/revokedCertificates/$i/crlEntryExtensions");
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Set a Revoked Certificate Extension
+     *
+     * @param string $serial
+     * @param string $id
+     * @param mixed $value
+     * @param bool $critical optional
+     * @param bool $replace optional
+     * @access public
+     * @return bool
+     */
+    function setRevokedCertificateExtension($serial, $id, $value, $critical = false, $replace = true)
+    {
+        if (isset($this->currentCert['tbsCertList'])) {
+            if (is_array($rclist = &$this->_subArray($this->currentCert, 'tbsCertList/revokedCertificates', true))) {
+                if (($i = $this->_revokedCertificate($rclist, $serial, true)) !== false) {
+                    return $this->_setExtension($id, $value, $critical, $replace, "tbsCertList/revokedCertificates/$i/crlEntryExtensions");
+                }
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Extract raw BER from Base64 encoding
+     *
+     * @access private
+     * @param string $str
+     * @return string
+     */
+    function _extractBER($str)
+    {
+        /* X.509 certs are assumed to be base64 encoded but sometimes they'll have additional things in them
+         * above and beyond the ceritificate.
+         * ie. some may have the following preceding the -----BEGIN CERTIFICATE----- line:
+         *
+         * Bag Attributes
+         *     localKeyID: 01 00 00 00
+         * subject=/O=organization/OU=org unit/CN=common name
+         * issuer=/O=organization/CN=common name
+         */
+        $temp = preg_replace('#.*?^-+[^-]+-+[\r\n ]*$#ms', '', $str, 1);
+        // remove the -----BEGIN CERTIFICATE----- and -----END CERTIFICATE----- stuff
+        $temp = preg_replace('#-+[^-]+-+#', '', $temp);
+        // remove new lines
+        $temp = str_replace(array("\r", "\n", ' '), '', $temp);
+        $temp = preg_match('#^[a-zA-Z\d/+]*={0,2}$#', $temp) ? base64_decode($temp) : false;
+        return $temp != false ? $temp : $str;
+    }
+
+    /**
+     * Returns the OID corresponding to a name
+     *
+     * What's returned in the associative array returned by loadX509() (or load*()) is either a name or an OID if
+     * no OID to name mapping is available. The problem with this is that what may be an unmapped OID in one version
+     * of phpseclib may not be unmapped in the next version, so apps that are looking at this OID may not be able
+     * to work from version to version.
+     *
+     * This method will return the OID if a name is passed to it and if no mapping is avialable it'll assume that
+     * what's being passed to it already is an OID and return that instead. A few examples.
+     *
+     * getOID('2.16.840.1.101.3.4.2.1') == '2.16.840.1.101.3.4.2.1'
+     * getOID('id-sha256') == '2.16.840.1.101.3.4.2.1'
+     * getOID('zzz') == 'zzz'
+     *
+     * @access public
+     * @return string
+     */
+    function getOID($name)
+    {
+        static $reverseMap;
+        if (!isset($reverseMap)) {
+            $reverseMap = array_flip($this->oids);
+        }
+        return isset($reverseMap[$name]) ? $reverseMap[$name] : $name;
+    }
+}
diff --git a/lib/php/phpseclib/Math/BigInteger.php b/lib/php/phpseclib/Math/BigInteger.php
new file mode 100644
index 00000000..52858ea8
--- /dev/null
+++ b/lib/php/phpseclib/Math/BigInteger.php
@@ -0,0 +1,3812 @@
+<?php
+
+/**
+ * Pure-PHP arbitrary precision integer arithmetic library.
+ *
+ * Supports base-2, base-10, base-16, and base-256 numbers.  Uses the GMP or BCMath extensions, if available,
+ * and an internal implementation, otherwise.
+ *
+ * PHP versions 4 and 5
+ *
+ * {@internal (all DocBlock comments regarding implementation - such as the one that follows - refer to the
+ * {@link MATH_BIGINTEGER_MODE_INTERNAL MATH_BIGINTEGER_MODE_INTERNAL} mode)
+ *
+ * Math_BigInteger uses base-2**26 to perform operations such as multiplication and division and
+ * base-2**52 (ie. two base 2**26 digits) to perform addition and subtraction.  Because the largest possible
+ * value when multiplying two base-2**26 numbers together is a base-2**52 number, double precision floating
+ * point numbers - numbers that should be supported on most hardware and whose significand is 53 bits - are
+ * used.  As a consequence, bitwise operators such as >> and << cannot be used, nor can the modulo operator %,
+ * which only supports integers.  Although this fact will slow this library down, the fact that such a high
+ * base is being used should more than compensate.
+ *
+ * Numbers are stored in {@link http://en.wikipedia.org/wiki/Endianness little endian} format.  ie.
+ * (new Math_BigInteger(pow(2, 26)))->value = array(0, 1)
+ *
+ * Useful resources are as follows:
+ *
+ *  - {@link http://www.cacr.math.uwaterloo.ca/hac/about/chap14.pdf Handbook of Applied Cryptography (HAC)}
+ *  - {@link http://math.libtomcrypt.com/files/tommath.pdf Multi-Precision Math (MPM)}
+ *  - Java's BigInteger classes.  See /j2se/src/share/classes/java/math in jdk-1_5_0-src-jrl.zip
+ *
+ * Here's an example of how to use this library:
+ * <code>
+ * <?php
+ *    include 'Math/BigInteger.php';
+ *
+ *    $a = new Math_BigInteger(2);
+ *    $b = new Math_BigInteger(3);
+ *
+ *    $c = $a->add($b);
+ *
+ *    echo $c->toString(); // outputs 5
+ * ?>
+ * </code>
+ *
+ * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @category  Math
+ * @package   Math_BigInteger
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2006 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ */
+
+/**#@+
+ * Reduction constants
+ *
+ * @access private
+ * @see self::_reduce()
+ */
+/**
+ * @see self::_montgomery()
+ * @see self::_prepMontgomery()
+ */
+define('MATH_BIGINTEGER_MONTGOMERY', 0);
+/**
+ * @see self::_barrett()
+ */
+define('MATH_BIGINTEGER_BARRETT', 1);
+/**
+ * @see self::_mod2()
+ */
+define('MATH_BIGINTEGER_POWEROF2', 2);
+/**
+ * @see self::_remainder()
+ */
+define('MATH_BIGINTEGER_CLASSIC', 3);
+/**
+ * @see self::__clone()
+ */
+define('MATH_BIGINTEGER_NONE', 4);
+/**#@-*/
+
+/**#@+
+ * Array constants
+ *
+ * Rather than create a thousands and thousands of new Math_BigInteger objects in repeated function calls to add() and
+ * multiply() or whatever, we'll just work directly on arrays, taking them in as parameters and returning them.
+ *
+ * @access private
+ */
+/**
+ * $result[MATH_BIGINTEGER_VALUE] contains the value.
+ */
+define('MATH_BIGINTEGER_VALUE', 0);
+/**
+ * $result[MATH_BIGINTEGER_SIGN] contains the sign.
+ */
+define('MATH_BIGINTEGER_SIGN', 1);
+/**#@-*/
+
+/**#@+
+ * @access private
+ * @see self::_montgomery()
+ * @see self::_barrett()
+ */
+/**
+ * Cache constants
+ *
+ * $cache[MATH_BIGINTEGER_VARIABLE] tells us whether or not the cached data is still valid.
+ */
+define('MATH_BIGINTEGER_VARIABLE', 0);
+/**
+ * $cache[MATH_BIGINTEGER_DATA] contains the cached data.
+ */
+define('MATH_BIGINTEGER_DATA', 1);
+/**#@-*/
+
+/**#@+
+ * Mode constants.
+ *
+ * @access private
+ * @see self::Math_BigInteger()
+ */
+/**
+ * To use the pure-PHP implementation
+ */
+define('MATH_BIGINTEGER_MODE_INTERNAL', 1);
+/**
+ * To use the BCMath library
+ *
+ * (if enabled; otherwise, the internal implementation will be used)
+ */
+define('MATH_BIGINTEGER_MODE_BCMATH', 2);
+/**
+ * To use the GMP library
+ *
+ * (if present; otherwise, either the BCMath or the internal implementation will be used)
+ */
+define('MATH_BIGINTEGER_MODE_GMP', 3);
+/**#@-*/
+
+/**
+ * Karatsuba Cutoff
+ *
+ * At what point do we switch between Karatsuba multiplication and schoolbook long multiplication?
+ *
+ * @access private
+ */
+define('MATH_BIGINTEGER_KARATSUBA_CUTOFF', 25);
+
+/**
+ * Pure-PHP arbitrary precision integer arithmetic library. Supports base-2, base-10, base-16, and base-256
+ * numbers.
+ *
+ * @package Math_BigInteger
+ * @author  Jim Wigginton <terrafrost@php.net>
+ * @access  public
+ */
+class Math_BigInteger
+{
+    /**
+     * Holds the BigInteger's value.
+     *
+     * @var array
+     * @access private
+     */
+    var $value;
+
+    /**
+     * Holds the BigInteger's magnitude.
+     *
+     * @var bool
+     * @access private
+     */
+    var $is_negative = false;
+
+    /**
+     * Precision
+     *
+     * @see self::setPrecision()
+     * @access private
+     */
+    var $precision = -1;
+
+    /**
+     * Precision Bitmask
+     *
+     * @see self::setPrecision()
+     * @access private
+     */
+    var $bitmask = false;
+
+    /**
+     * Mode independent value used for serialization.
+     *
+     * If the bcmath or gmp extensions are installed $this->value will be a non-serializable resource, hence the need for
+     * a variable that'll be serializable regardless of whether or not extensions are being used.  Unlike $this->value,
+     * however, $this->hex is only calculated when $this->__sleep() is called.
+     *
+     * @see self::__sleep()
+     * @see self::__wakeup()
+     * @var string
+     * @access private
+     */
+    var $hex;
+
+    /**
+     * Converts base-2, base-10, base-16, and binary strings (base-256) to BigIntegers.
+     *
+     * If the second parameter - $base - is negative, then it will be assumed that the number's are encoded using
+     * two's compliment.  The sole exception to this is -10, which is treated the same as 10 is.
+     *
+     * Here's an example:
+     * <code>
+     * <?php
+     *    include 'Math/BigInteger.php';
+     *
+     *    $a = new Math_BigInteger('0x32', 16); // 50 in base-16
+     *
+     *    echo $a->toString(); // outputs 50
+     * ?>
+     * </code>
+     *
+     * @param $x base-10 number or base-$base number if $base set.
+     * @param int $base
+     * @return Math_BigInteger
+     * @access public
+     */
+    function __construct($x = 0, $base = 10)
+    {
+        if (!defined('MATH_BIGINTEGER_MODE')) {
+            switch (true) {
+                case extension_loaded('gmp'):
+                    define('MATH_BIGINTEGER_MODE', MATH_BIGINTEGER_MODE_GMP);
+                    break;
+                case extension_loaded('bcmath'):
+                    define('MATH_BIGINTEGER_MODE', MATH_BIGINTEGER_MODE_BCMATH);
+                    break;
+                default:
+                    define('MATH_BIGINTEGER_MODE', MATH_BIGINTEGER_MODE_INTERNAL);
+            }
+        }
+
+        if (extension_loaded('openssl') && !defined('MATH_BIGINTEGER_OPENSSL_DISABLE') && !defined('MATH_BIGINTEGER_OPENSSL_ENABLED')) {
+            // some versions of XAMPP have mismatched versions of OpenSSL which causes it not to work
+            ob_start();
+            @phpinfo();
+            $content = ob_get_contents();
+            ob_end_clean();
+
+            preg_match_all('#OpenSSL (Header|Library) Version(.*)#im', $content, $matches);
+
+            $versions = array();
+            if (!empty($matches[1])) {
+                for ($i = 0; $i < count($matches[1]); $i++) {
+                    $fullVersion = trim(str_replace('=>', '', strip_tags($matches[2][$i])));
+
+                    // Remove letter part in OpenSSL version
+                    if (!preg_match('/(\d+\.\d+\.\d+)/i', $fullVersion, $m)) {
+                        $versions[$matches[1][$i]] = $fullVersion;
+                    } else {
+                        $versions[$matches[1][$i]] = $m[0];
+                    }
+                }
+            }
+
+            // it doesn't appear that OpenSSL versions were reported upon until PHP 5.3+
+            switch (true) {
+                case !isset($versions['Header']):
+                case !isset($versions['Library']):
+                case $versions['Header'] == $versions['Library']:
+                case version_compare($versions['Header'], '1.0.0') >= 0 && version_compare($versions['Library'], '1.0.0') >= 0:
+                    define('MATH_BIGINTEGER_OPENSSL_ENABLED', true);
+                    break;
+                default:
+                    define('MATH_BIGINTEGER_OPENSSL_DISABLE', true);
+            }
+        }
+
+        if (!defined('PHP_INT_SIZE')) {
+            define('PHP_INT_SIZE', 4);
+        }
+
+        if (!defined('MATH_BIGINTEGER_BASE') && MATH_BIGINTEGER_MODE == MATH_BIGINTEGER_MODE_INTERNAL) {
+            switch (PHP_INT_SIZE) {
+                case 8: // use 64-bit integers if int size is 8 bytes
+                    define('MATH_BIGINTEGER_BASE',       31);
+                    define('MATH_BIGINTEGER_BASE_FULL',  0x80000000);
+                    define('MATH_BIGINTEGER_MAX_DIGIT',  0x7FFFFFFF);
+                    define('MATH_BIGINTEGER_MSB',        0x40000000);
+                    // 10**9 is the closest we can get to 2**31 without passing it
+                    define('MATH_BIGINTEGER_MAX10',      1000000000);
+                    define('MATH_BIGINTEGER_MAX10_LEN',  9);
+                    // the largest digit that may be used in addition / subtraction
+                    define('MATH_BIGINTEGER_MAX_DIGIT2', pow(2, 62));
+                    break;
+                //case 4: // use 64-bit floats if int size is 4 bytes
+                default:
+                    define('MATH_BIGINTEGER_BASE',       26);
+                    define('MATH_BIGINTEGER_BASE_FULL',  0x4000000);
+                    define('MATH_BIGINTEGER_MAX_DIGIT',  0x3FFFFFF);
+                    define('MATH_BIGINTEGER_MSB',        0x2000000);
+                    // 10**7 is the closest to 2**26 without passing it
+                    define('MATH_BIGINTEGER_MAX10',      10000000);
+                    define('MATH_BIGINTEGER_MAX10_LEN',  7);
+                    // the largest digit that may be used in addition / subtraction
+                    // we do pow(2, 52) instead of using 4503599627370496 directly because some
+                    // PHP installations will truncate 4503599627370496.
+                    define('MATH_BIGINTEGER_MAX_DIGIT2', pow(2, 52));
+            }
+        }
+
+        switch (MATH_BIGINTEGER_MODE) {
+            case MATH_BIGINTEGER_MODE_GMP:
+                switch (true) {
+                    case is_resource($x) && get_resource_type($x) == 'GMP integer':
+                    // PHP 5.6 switched GMP from using resources to objects
+                    case is_object($x) && get_class($x) == 'GMP':
+                        $this->value = $x;
+                        return;
+                }
+                $this->value = gmp_init(0);
+                break;
+            case MATH_BIGINTEGER_MODE_BCMATH:
+                $this->value = '0';
+                break;
+            default:
+                $this->value = array();
+        }
+
+        // '0' counts as empty() but when the base is 256 '0' is equal to ord('0') or 48
+        // '0' is the only value like this per http://php.net/empty
+        if (empty($x) && (abs($base) != 256 || $x !== '0')) {
+            return;
+        }
+
+        switch ($base) {
+            case -256:
+                if (ord($x[0]) & 0x80) {
+                    $x = ~$x;
+                    $this->is_negative = true;
+                }
+            case 256:
+                switch (MATH_BIGINTEGER_MODE) {
+                    case MATH_BIGINTEGER_MODE_GMP:
+                        $this->value = function_exists('gmp_import') ?
+                            gmp_import($x) :
+                            gmp_init('0x' . bin2hex($x));
+                        if ($this->is_negative) {
+                            $this->value = gmp_neg($this->value);
+                        }
+                        break;
+                    case MATH_BIGINTEGER_MODE_BCMATH:
+                        // round $len to the nearest 4 (thanks, DavidMJ!)
+                        $len = (strlen($x) + 3) & 0xFFFFFFFC;
+
+                        $x = str_pad($x, $len, chr(0), STR_PAD_LEFT);
+
+                        for ($i = 0; $i < $len; $i+= 4) {
+                            $this->value = bcmul($this->value, '4294967296', 0); // 4294967296 == 2**32
+                            $this->value = bcadd($this->value, 0x1000000 * ord($x[$i]) + ((ord($x[$i + 1]) << 16) | (ord($x[$i + 2]) << 8) | ord($x[$i + 3])), 0);
+                        }
+
+                        if ($this->is_negative) {
+                            $this->value = '-' . $this->value;
+                        }
+
+                        break;
+                    // converts a base-2**8 (big endian / msb) number to base-2**26 (little endian / lsb)
+                    default:
+                        while (strlen($x)) {
+                            $this->value[] = $this->_bytes2int($this->_base256_rshift($x, MATH_BIGINTEGER_BASE));
+                        }
+                }
+
+                if ($this->is_negative) {
+                    if (MATH_BIGINTEGER_MODE != MATH_BIGINTEGER_MODE_INTERNAL) {
+                        $this->is_negative = false;
+                    }
+                    $temp = $this->add(new Math_BigInteger('-1'));
+                    $this->value = $temp->value;
+                }
+                break;
+            case 16:
+            case -16:
+                if ($base > 0 && $x[0] == '-') {
+                    $this->is_negative = true;
+                    $x = substr($x, 1);
+                }
+
+                $x = preg_replace('#^(?:0x)?([A-Fa-f0-9]*).*#', '$1', $x);
+
+                $is_negative = false;
+                if ($base < 0 && hexdec($x[0]) >= 8) {
+                    $this->is_negative = $is_negative = true;
+                    $x = bin2hex(~pack('H*', $x));
+                }
+
+                switch (MATH_BIGINTEGER_MODE) {
+                    case MATH_BIGINTEGER_MODE_GMP:
+                        $temp = $this->is_negative ? '-0x' . $x : '0x' . $x;
+                        $this->value = gmp_init($temp);
+                        $this->is_negative = false;
+                        break;
+                    case MATH_BIGINTEGER_MODE_BCMATH:
+                        $x = (strlen($x) & 1) ? '0' . $x : $x;
+                        $temp = new Math_BigInteger(pack('H*', $x), 256);
+                        $this->value = $this->is_negative ? '-' . $temp->value : $temp->value;
+                        $this->is_negative = false;
+                        break;
+                    default:
+                        $x = (strlen($x) & 1) ? '0' . $x : $x;
+                        $temp = new Math_BigInteger(pack('H*', $x), 256);
+                        $this->value = $temp->value;
+                }
+
+                if ($is_negative) {
+                    $temp = $this->add(new Math_BigInteger('-1'));
+                    $this->value = $temp->value;
+                }
+                break;
+            case 10:
+            case -10:
+                // (?<!^)(?:-).*: find any -'s that aren't at the beginning and then any characters that follow that
+                // (?<=^|-)0*: find any 0's that are preceded by the start of the string or by a - (ie. octals)
+                // [^-0-9].*: find any non-numeric characters and then any characters that follow that
+                $x = preg_replace('#(?<!^)(?:-).*|(?<=^|-)0*|[^-0-9].*#', '', $x);
+
+                switch (MATH_BIGINTEGER_MODE) {
+                    case MATH_BIGINTEGER_MODE_GMP:
+                        $this->value = gmp_init($x);
+                        break;
+                    case MATH_BIGINTEGER_MODE_BCMATH:
+                        // explicitly casting $x to a string is necessary, here, since doing $x[0] on -1 yields different
+                        // results then doing it on '-1' does (modInverse does $x[0])
+                        $this->value = $x === '-' ? '0' : (string) $x;
+                        break;
+                    default:
+                        $temp = new Math_BigInteger();
+
+                        $multiplier = new Math_BigInteger();
+                        $multiplier->value = array(MATH_BIGINTEGER_MAX10);
+
+                        if ($x[0] == '-') {
+                            $this->is_negative = true;
+                            $x = substr($x, 1);
+                        }
+
+                        $x = str_pad($x, strlen($x) + ((MATH_BIGINTEGER_MAX10_LEN - 1) * strlen($x)) % MATH_BIGINTEGER_MAX10_LEN, 0, STR_PAD_LEFT);
+                        while (strlen($x)) {
+                            $temp = $temp->multiply($multiplier);
+                            $temp = $temp->add(new Math_BigInteger($this->_int2bytes(substr($x, 0, MATH_BIGINTEGER_MAX10_LEN)), 256));
+                            $x = substr($x, MATH_BIGINTEGER_MAX10_LEN);
+                        }
+
+                        $this->value = $temp->value;
+                }
+                break;
+            case 2: // base-2 support originally implemented by Lluis Pamies - thanks!
+            case -2:
+                if ($base > 0 && $x[0] == '-') {
+                    $this->is_negative = true;
+                    $x = substr($x, 1);
+                }
+
+                $x = preg_replace('#^([01]*).*#', '$1', $x);
+                $x = str_pad($x, strlen($x) + (3 * strlen($x)) % 4, 0, STR_PAD_LEFT);
+
+                $str = '0x';
+                while (strlen($x)) {
+                    $part = substr($x, 0, 4);
+                    $str.= dechex(bindec($part));
+                    $x = substr($x, 4);
+                }
+
+                if ($this->is_negative) {
+                    $str = '-' . $str;
+                }
+
+                $temp = new Math_BigInteger($str, 8 * $base); // ie. either -16 or +16
+                $this->value = $temp->value;
+                $this->is_negative = $temp->is_negative;
+
+                break;
+            default:
+                // base not supported, so we'll let $this == 0
+        }
+    }
+
+    /**
+     * PHP4 compatible Default Constructor.
+     *
+     * @see self::__construct()
+     * @param $x base-10 number or base-$base number if $base set.
+     * @param int $base
+     * @access public
+     */
+    function Math_BigInteger($x = 0, $base = 10)
+    {
+        $this->__construct($x, $base);
+    }
+
+    /**
+     * Converts a BigInteger to a byte string (eg. base-256).
+     *
+     * Negative numbers are saved as positive numbers, unless $twos_compliment is set to true, at which point, they're
+     * saved as two's compliment.
+     *
+     * Here's an example:
+     * <code>
+     * <?php
+     *    include 'Math/BigInteger.php';
+     *
+     *    $a = new Math_BigInteger('65');
+     *
+     *    echo $a->toBytes(); // outputs chr(65)
+     * ?>
+     * </code>
+     *
+     * @param bool $twos_compliment
+     * @return string
+     * @access public
+     * @internal Converts a base-2**26 number to base-2**8
+     */
+    function toBytes($twos_compliment = false)
+    {
+        if ($twos_compliment) {
+            $comparison = $this->compare(new Math_BigInteger());
+            if ($comparison == 0) {
+                return $this->precision > 0 ? str_repeat(chr(0), ($this->precision + 1) >> 3) : '';
+            }
+
+            $temp = $comparison < 0 ? $this->add(new Math_BigInteger(1)) : $this->copy();
+            $bytes = $temp->toBytes();
+
+            if (!strlen($bytes)) { // eg. if the number we're trying to convert is -1
+                $bytes = chr(0);
+            }
+
+            if (ord($bytes[0]) & 0x80) {
+                $bytes = chr(0) . $bytes;
+            }
+
+            return $comparison < 0 ? ~$bytes : $bytes;
+        }
+
+        switch (MATH_BIGINTEGER_MODE) {
+            case MATH_BIGINTEGER_MODE_GMP:
+                if (gmp_cmp($this->value, gmp_init(0)) == 0) {
+                    return $this->precision > 0 ? str_repeat(chr(0), ($this->precision + 1) >> 3) : '';
+                }
+
+                if (function_exists('gmp_export')) {
+                    $temp = gmp_export($this->value);
+                } else {
+                    $temp = gmp_strval(gmp_abs($this->value), 16);
+                    $temp = (strlen($temp) & 1) ? '0' . $temp : $temp;
+                    $temp = pack('H*', $temp);
+                }
+
+                return $this->precision > 0 ?
+                    substr(str_pad($temp, $this->precision >> 3, chr(0), STR_PAD_LEFT), -($this->precision >> 3)) :
+                    ltrim($temp, chr(0));
+            case MATH_BIGINTEGER_MODE_BCMATH:
+                if ($this->value === '0') {
+                    return $this->precision > 0 ? str_repeat(chr(0), ($this->precision + 1) >> 3) : '';
+                }
+
+                $value = '';
+                $current = $this->value;
+
+                if ($current[0] == '-') {
+                    $current = substr($current, 1);
+                }
+
+                while (bccomp($current, '0', 0) > 0) {
+                    $temp = bcmod($current, '16777216');
+                    $value = chr($temp >> 16) . chr($temp >> 8) . chr($temp) . $value;
+                    $current = bcdiv($current, '16777216', 0);
+                }
+
+                return $this->precision > 0 ?
+                    substr(str_pad($value, $this->precision >> 3, chr(0), STR_PAD_LEFT), -($this->precision >> 3)) :
+                    ltrim($value, chr(0));
+        }
+
+        if (!count($this->value)) {
+            return $this->precision > 0 ? str_repeat(chr(0), ($this->precision + 1) >> 3) : '';
+        }
+        $result = $this->_int2bytes($this->value[count($this->value) - 1]);
+
+        $temp = $this->copy();
+
+        for ($i = count($temp->value) - 2; $i >= 0; --$i) {
+            $temp->_base256_lshift($result, MATH_BIGINTEGER_BASE);
+            $result = $result | str_pad($temp->_int2bytes($temp->value[$i]), strlen($result), chr(0), STR_PAD_LEFT);
+        }
+
+        return $this->precision > 0 ?
+            str_pad(substr($result, -(($this->precision + 7) >> 3)), ($this->precision + 7) >> 3, chr(0), STR_PAD_LEFT) :
+            $result;
+    }
+
+    /**
+     * Converts a BigInteger to a hex string (eg. base-16)).
+     *
+     * Negative numbers are saved as positive numbers, unless $twos_compliment is set to true, at which point, they're
+     * saved as two's compliment.
+     *
+     * Here's an example:
+     * <code>
+     * <?php
+     *    include 'Math/BigInteger.php';
+     *
+     *    $a = new Math_BigInteger('65');
+     *
+     *    echo $a->toHex(); // outputs '41'
+     * ?>
+     * </code>
+     *
+     * @param bool $twos_compliment
+     * @return string
+     * @access public
+     * @internal Converts a base-2**26 number to base-2**8
+     */
+    function toHex($twos_compliment = false)
+    {
+        return bin2hex($this->toBytes($twos_compliment));
+    }
+
+    /**
+     * Converts a BigInteger to a bit string (eg. base-2).
+     *
+     * Negative numbers are saved as positive numbers, unless $twos_compliment is set to true, at which point, they're
+     * saved as two's compliment.
+     *
+     * Here's an example:
+     * <code>
+     * <?php
+     *    include 'Math/BigInteger.php';
+     *
+     *    $a = new Math_BigInteger('65');
+     *
+     *    echo $a->toBits(); // outputs '1000001'
+     * ?>
+     * </code>
+     *
+     * @param bool $twos_compliment
+     * @return string
+     * @access public
+     * @internal Converts a base-2**26 number to base-2**2
+     */
+    function toBits($twos_compliment = false)
+    {
+        $hex = $this->toHex($twos_compliment);
+        $bits = '';
+        for ($i = strlen($hex) - 8, $start = strlen($hex) & 7; $i >= $start; $i-=8) {
+            $bits = str_pad(decbin(hexdec(substr($hex, $i, 8))), 32, '0', STR_PAD_LEFT) . $bits;
+        }
+        if ($start) { // hexdec('') == 0
+            $bits = str_pad(decbin(hexdec(substr($hex, 0, $start))), 8, '0', STR_PAD_LEFT) . $bits;
+        }
+        $result = $this->precision > 0 ? substr($bits, -$this->precision) : ltrim($bits, '0');
+
+        if ($twos_compliment && $this->compare(new Math_BigInteger()) > 0 && $this->precision <= 0) {
+            return '0' . $result;
+        }
+
+        return $result;
+    }
+
+    /**
+     * Converts a BigInteger to a base-10 number.
+     *
+     * Here's an example:
+     * <code>
+     * <?php
+     *    include 'Math/BigInteger.php';
+     *
+     *    $a = new Math_BigInteger('50');
+     *
+     *    echo $a->toString(); // outputs 50
+     * ?>
+     * </code>
+     *
+     * @return string
+     * @access public
+     * @internal Converts a base-2**26 number to base-10**7 (which is pretty much base-10)
+     */
+    function toString()
+    {
+        switch (MATH_BIGINTEGER_MODE) {
+            case MATH_BIGINTEGER_MODE_GMP:
+                return gmp_strval($this->value);
+            case MATH_BIGINTEGER_MODE_BCMATH:
+                if ($this->value === '0') {
+                    return '0';
+                }
+
+                return ltrim($this->value, '0');
+        }
+
+        if (!count($this->value)) {
+            return '0';
+        }
+
+        $temp = $this->copy();
+        $temp->is_negative = false;
+
+        $divisor = new Math_BigInteger();
+        $divisor->value = array(MATH_BIGINTEGER_MAX10);
+        $result = '';
+        while (count($temp->value)) {
+            list($temp, $mod) = $temp->divide($divisor);
+            $result = str_pad(isset($mod->value[0]) ? $mod->value[0] : '', MATH_BIGINTEGER_MAX10_LEN, '0', STR_PAD_LEFT) . $result;
+        }
+        $result = ltrim($result, '0');
+        if (empty($result)) {
+            $result = '0';
+        }
+
+        if ($this->is_negative) {
+            $result = '-' . $result;
+        }
+
+        return $result;
+    }
+
+    /**
+     * Copy an object
+     *
+     * PHP5 passes objects by reference while PHP4 passes by value.  As such, we need a function to guarantee
+     * that all objects are passed by value, when appropriate.  More information can be found here:
+     *
+     * {@link http://php.net/language.oop5.basic#51624}
+     *
+     * @access public
+     * @see self::__clone()
+     * @return Math_BigInteger
+     */
+    function copy()
+    {
+        $temp = new Math_BigInteger();
+        $temp->value = $this->value;
+        $temp->is_negative = $this->is_negative;
+        $temp->precision = $this->precision;
+        $temp->bitmask = $this->bitmask;
+        return $temp;
+    }
+
+    /**
+     *  __toString() magic method
+     *
+     * Will be called, automatically, if you're supporting just PHP5.  If you're supporting PHP4, you'll need to call
+     * toString().
+     *
+     * @access public
+     * @internal Implemented per a suggestion by Techie-Michael - thanks!
+     */
+    function __toString()
+    {
+        return $this->toString();
+    }
+
+    /**
+     * __clone() magic method
+     *
+     * Although you can call Math_BigInteger::__toString() directly in PHP5, you cannot call Math_BigInteger::__clone()
+     * directly in PHP5.  You can in PHP4 since it's not a magic method, but in PHP5, you have to call it by using the PHP5
+     * only syntax of $y = clone $x.  As such, if you're trying to write an application that works on both PHP4 and PHP5,
+     * call Math_BigInteger::copy(), instead.
+     *
+     * @access public
+     * @see self::copy()
+     * @return Math_BigInteger
+     */
+    function __clone()
+    {
+        return $this->copy();
+    }
+
+    /**
+     *  __sleep() magic method
+     *
+     * Will be called, automatically, when serialize() is called on a Math_BigInteger object.
+     *
+     * @see self::__wakeup()
+     * @access public
+     */
+    function __sleep()
+    {
+        $this->hex = $this->toHex(true);
+        $vars = array('hex');
+        if ($this->precision > 0) {
+            $vars[] = 'precision';
+        }
+        return $vars;
+    }
+
+    /**
+     *  __wakeup() magic method
+     *
+     * Will be called, automatically, when unserialize() is called on a Math_BigInteger object.
+     *
+     * @see self::__sleep()
+     * @access public
+     */
+    function __wakeup()
+    {
+        $temp = new Math_BigInteger($this->hex, -16);
+        $this->value = $temp->value;
+        $this->is_negative = $temp->is_negative;
+        if ($this->precision > 0) {
+            // recalculate $this->bitmask
+            $this->setPrecision($this->precision);
+        }
+    }
+
+    /**
+     *  __debugInfo() magic method
+     *
+     * Will be called, automatically, when print_r() or var_dump() are called
+     *
+     * @access public
+     */
+    function __debugInfo()
+    {
+        $opts = array();
+        switch (MATH_BIGINTEGER_MODE) {
+            case MATH_BIGINTEGER_MODE_GMP:
+                $engine = 'gmp';
+                break;
+            case MATH_BIGINTEGER_MODE_BCMATH:
+                $engine = 'bcmath';
+                break;
+            case MATH_BIGINTEGER_MODE_INTERNAL:
+                $engine = 'internal';
+                $opts[] = PHP_INT_SIZE == 8 ? '64-bit' : '32-bit';
+        }
+        if (MATH_BIGINTEGER_MODE != MATH_BIGINTEGER_MODE_GMP && defined('MATH_BIGINTEGER_OPENSSL_ENABLED')) {
+            $opts[] = 'OpenSSL';
+        }
+        if (!empty($opts)) {
+            $engine.= ' (' . implode($opts, ', ') . ')';
+        }
+        return array(
+            'value' => '0x' . $this->toHex(true),
+            'engine' => $engine
+        );
+    }
+
+    /**
+     * Adds two BigIntegers.
+     *
+     * Here's an example:
+     * <code>
+     * <?php
+     *    include 'Math/BigInteger.php';
+     *
+     *    $a = new Math_BigInteger('10');
+     *    $b = new Math_BigInteger('20');
+     *
+     *    $c = $a->add($b);
+     *
+     *    echo $c->toString(); // outputs 30
+     * ?>
+     * </code>
+     *
+     * @param Math_BigInteger $y
+     * @return Math_BigInteger
+     * @access public
+     * @internal Performs base-2**52 addition
+     */
+    function add($y)
+    {
+        switch (MATH_BIGINTEGER_MODE) {
+            case MATH_BIGINTEGER_MODE_GMP:
+                $temp = new Math_BigInteger();
+                $temp->value = gmp_add($this->value, $y->value);
+
+                return $this->_normalize($temp);
+            case MATH_BIGINTEGER_MODE_BCMATH:
+                $temp = new Math_BigInteger();
+                $temp->value = bcadd($this->value, $y->value, 0);
+
+                return $this->_normalize($temp);
+        }
+
+        $temp = $this->_add($this->value, $this->is_negative, $y->value, $y->is_negative);
+
+        $result = new Math_BigInteger();
+        $result->value = $temp[MATH_BIGINTEGER_VALUE];
+        $result->is_negative = $temp[MATH_BIGINTEGER_SIGN];
+
+        return $this->_normalize($result);
+    }
+
+    /**
+     * Performs addition.
+     *
+     * @param array $x_value
+     * @param bool $x_negative
+     * @param array $y_value
+     * @param bool $y_negative
+     * @return array
+     * @access private
+     */
+    function _add($x_value, $x_negative, $y_value, $y_negative)
+    {
+        $x_size = count($x_value);
+        $y_size = count($y_value);
+
+        if ($x_size == 0) {
+            return array(
+                MATH_BIGINTEGER_VALUE => $y_value,
+                MATH_BIGINTEGER_SIGN => $y_negative
+            );
+        } elseif ($y_size == 0) {
+            return array(
+                MATH_BIGINTEGER_VALUE => $x_value,
+                MATH_BIGINTEGER_SIGN => $x_negative
+            );
+        }
+
+        // subtract, if appropriate
+        if ($x_negative != $y_negative) {
+            if ($x_value == $y_value) {
+                return array(
+                    MATH_BIGINTEGER_VALUE => array(),
+                    MATH_BIGINTEGER_SIGN => false
+                );
+            }
+
+            $temp = $this->_subtract($x_value, false, $y_value, false);
+            $temp[MATH_BIGINTEGER_SIGN] = $this->_compare($x_value, false, $y_value, false) > 0 ?
+                                          $x_negative : $y_negative;
+
+            return $temp;
+        }
+
+        if ($x_size < $y_size) {
+            $size = $x_size;
+            $value = $y_value;
+        } else {
+            $size = $y_size;
+            $value = $x_value;
+        }
+
+        $value[count($value)] = 0; // just in case the carry adds an extra digit
+
+        $carry = 0;
+        for ($i = 0, $j = 1; $j < $size; $i+=2, $j+=2) {
+            $sum = $x_value[$j] * MATH_BIGINTEGER_BASE_FULL + $x_value[$i] + $y_value[$j] * MATH_BIGINTEGER_BASE_FULL + $y_value[$i] + $carry;
+            $carry = $sum >= MATH_BIGINTEGER_MAX_DIGIT2; // eg. floor($sum / 2**52); only possible values (in any base) are 0 and 1
+            $sum = $carry ? $sum - MATH_BIGINTEGER_MAX_DIGIT2 : $sum;
+
+            $temp = MATH_BIGINTEGER_BASE === 26 ? intval($sum / 0x4000000) : ($sum >> 31);
+
+            $value[$i] = (int) ($sum - MATH_BIGINTEGER_BASE_FULL * $temp); // eg. a faster alternative to fmod($sum, 0x4000000)
+            $value[$j] = $temp;
+        }
+
+        if ($j == $size) { // ie. if $y_size is odd
+            $sum = $x_value[$i] + $y_value[$i] + $carry;
+            $carry = $sum >= MATH_BIGINTEGER_BASE_FULL;
+            $value[$i] = $carry ? $sum - MATH_BIGINTEGER_BASE_FULL : $sum;
+            ++$i; // ie. let $i = $j since we've just done $value[$i]
+        }
+
+        if ($carry) {
+            for (; $value[$i] == MATH_BIGINTEGER_MAX_DIGIT; ++$i) {
+                $value[$i] = 0;
+            }
+            ++$value[$i];
+        }
+
+        return array(
+            MATH_BIGINTEGER_VALUE => $this->_trim($value),
+            MATH_BIGINTEGER_SIGN => $x_negative
+        );
+    }
+
+    /**
+     * Subtracts two BigIntegers.
+     *
+     * Here's an example:
+     * <code>
+     * <?php
+     *    include 'Math/BigInteger.php';
+     *
+     *    $a = new Math_BigInteger('10');
+     *    $b = new Math_BigInteger('20');
+     *
+     *    $c = $a->subtract($b);
+     *
+     *    echo $c->toString(); // outputs -10
+     * ?>
+     * </code>
+     *
+     * @param Math_BigInteger $y
+     * @return Math_BigInteger
+     * @access public
+     * @internal Performs base-2**52 subtraction
+     */
+    function subtract($y)
+    {
+        switch (MATH_BIGINTEGER_MODE) {
+            case MATH_BIGINTEGER_MODE_GMP:
+                $temp = new Math_BigInteger();
+                $temp->value = gmp_sub($this->value, $y->value);
+
+                return $this->_normalize($temp);
+            case MATH_BIGINTEGER_MODE_BCMATH:
+                $temp = new Math_BigInteger();
+                $temp->value = bcsub($this->value, $y->value, 0);
+
+                return $this->_normalize($temp);
+        }
+
+        $temp = $this->_subtract($this->value, $this->is_negative, $y->value, $y->is_negative);
+
+        $result = new Math_BigInteger();
+        $result->value = $temp[MATH_BIGINTEGER_VALUE];
+        $result->is_negative = $temp[MATH_BIGINTEGER_SIGN];
+
+        return $this->_normalize($result);
+    }
+
+    /**
+     * Performs subtraction.
+     *
+     * @param array $x_value
+     * @param bool $x_negative
+     * @param array $y_value
+     * @param bool $y_negative
+     * @return array
+     * @access private
+     */
+    function _subtract($x_value, $x_negative, $y_value, $y_negative)
+    {
+        $x_size = count($x_value);
+        $y_size = count($y_value);
+
+        if ($x_size == 0) {
+            return array(
+                MATH_BIGINTEGER_VALUE => $y_value,
+                MATH_BIGINTEGER_SIGN => !$y_negative
+            );
+        } elseif ($y_size == 0) {
+            return array(
+                MATH_BIGINTEGER_VALUE => $x_value,
+                MATH_BIGINTEGER_SIGN => $x_negative
+            );
+        }
+
+        // add, if appropriate (ie. -$x - +$y or +$x - -$y)
+        if ($x_negative != $y_negative) {
+            $temp = $this->_add($x_value, false, $y_value, false);
+            $temp[MATH_BIGINTEGER_SIGN] = $x_negative;
+
+            return $temp;
+        }
+
+        $diff = $this->_compare($x_value, $x_negative, $y_value, $y_negative);
+
+        if (!$diff) {
+            return array(
+                MATH_BIGINTEGER_VALUE => array(),
+                MATH_BIGINTEGER_SIGN => false
+            );
+        }
+
+        // switch $x and $y around, if appropriate.
+        if ((!$x_negative && $diff < 0) || ($x_negative && $diff > 0)) {
+            $temp = $x_value;
+            $x_value = $y_value;
+            $y_value = $temp;
+
+            $x_negative = !$x_negative;
+
+            $x_size = count($x_value);
+            $y_size = count($y_value);
+        }
+
+        // at this point, $x_value should be at least as big as - if not bigger than - $y_value
+
+        $carry = 0;
+        for ($i = 0, $j = 1; $j < $y_size; $i+=2, $j+=2) {
+            $sum = $x_value[$j] * MATH_BIGINTEGER_BASE_FULL + $x_value[$i] - $y_value[$j] * MATH_BIGINTEGER_BASE_FULL - $y_value[$i] - $carry;
+            $carry = $sum < 0; // eg. floor($sum / 2**52); only possible values (in any base) are 0 and 1
+            $sum = $carry ? $sum + MATH_BIGINTEGER_MAX_DIGIT2 : $sum;
+
+            $temp = MATH_BIGINTEGER_BASE === 26 ? intval($sum / 0x4000000) : ($sum >> 31);
+
+            $x_value[$i] = (int) ($sum - MATH_BIGINTEGER_BASE_FULL * $temp);
+            $x_value[$j] = $temp;
+        }
+
+        if ($j == $y_size) { // ie. if $y_size is odd
+            $sum = $x_value[$i] - $y_value[$i] - $carry;
+            $carry = $sum < 0;
+            $x_value[$i] = $carry ? $sum + MATH_BIGINTEGER_BASE_FULL : $sum;
+            ++$i;
+        }
+
+        if ($carry) {
+            for (; !$x_value[$i]; ++$i) {
+                $x_value[$i] = MATH_BIGINTEGER_MAX_DIGIT;
+            }
+            --$x_value[$i];
+        }
+
+        return array(
+            MATH_BIGINTEGER_VALUE => $this->_trim($x_value),
+            MATH_BIGINTEGER_SIGN => $x_negative
+        );
+    }
+
+    /**
+     * Multiplies two BigIntegers
+     *
+     * Here's an example:
+     * <code>
+     * <?php
+     *    include 'Math/BigInteger.php';
+     *
+     *    $a = new Math_BigInteger('10');
+     *    $b = new Math_BigInteger('20');
+     *
+     *    $c = $a->multiply($b);
+     *
+     *    echo $c->toString(); // outputs 200
+     * ?>
+     * </code>
+     *
+     * @param Math_BigInteger $x
+     * @return Math_BigInteger
+     * @access public
+     */
+    function multiply($x)
+    {
+        switch (MATH_BIGINTEGER_MODE) {
+            case MATH_BIGINTEGER_MODE_GMP:
+                $temp = new Math_BigInteger();
+                $temp->value = gmp_mul($this->value, $x->value);
+
+                return $this->_normalize($temp);
+            case MATH_BIGINTEGER_MODE_BCMATH:
+                $temp = new Math_BigInteger();
+                $temp->value = bcmul($this->value, $x->value, 0);
+
+                return $this->_normalize($temp);
+        }
+
+        $temp = $this->_multiply($this->value, $this->is_negative, $x->value, $x->is_negative);
+
+        $product = new Math_BigInteger();
+        $product->value = $temp[MATH_BIGINTEGER_VALUE];
+        $product->is_negative = $temp[MATH_BIGINTEGER_SIGN];
+
+        return $this->_normalize($product);
+    }
+
+    /**
+     * Performs multiplication.
+     *
+     * @param array $x_value
+     * @param bool $x_negative
+     * @param array $y_value
+     * @param bool $y_negative
+     * @return array
+     * @access private
+     */
+    function _multiply($x_value, $x_negative, $y_value, $y_negative)
+    {
+        //if ( $x_value == $y_value ) {
+        //    return array(
+        //        MATH_BIGINTEGER_VALUE => $this->_square($x_value),
+        //        MATH_BIGINTEGER_SIGN => $x_sign != $y_value
+        //    );
+        //}
+
+        $x_length = count($x_value);
+        $y_length = count($y_value);
+
+        if (!$x_length || !$y_length) { // a 0 is being multiplied
+            return array(
+                MATH_BIGINTEGER_VALUE => array(),
+                MATH_BIGINTEGER_SIGN => false
+            );
+        }
+
+        return array(
+            MATH_BIGINTEGER_VALUE => min($x_length, $y_length) < 2 * MATH_BIGINTEGER_KARATSUBA_CUTOFF ?
+                $this->_trim($this->_regularMultiply($x_value, $y_value)) :
+                $this->_trim($this->_karatsuba($x_value, $y_value)),
+            MATH_BIGINTEGER_SIGN => $x_negative != $y_negative
+        );
+    }
+
+    /**
+     * Performs long multiplication on two BigIntegers
+     *
+     * Modeled after 'multiply' in MutableBigInteger.java.
+     *
+     * @param array $x_value
+     * @param array $y_value
+     * @return array
+     * @access private
+     */
+    function _regularMultiply($x_value, $y_value)
+    {
+        $x_length = count($x_value);
+        $y_length = count($y_value);
+
+        if (!$x_length || !$y_length) { // a 0 is being multiplied
+            return array();
+        }
+
+        if ($x_length < $y_length) {
+            $temp = $x_value;
+            $x_value = $y_value;
+            $y_value = $temp;
+
+            $x_length = count($x_value);
+            $y_length = count($y_value);
+        }
+
+        $product_value = $this->_array_repeat(0, $x_length + $y_length);
+
+        // the following for loop could be removed if the for loop following it
+        // (the one with nested for loops) initially set $i to 0, but
+        // doing so would also make the result in one set of unnecessary adds,
+        // since on the outermost loops first pass, $product->value[$k] is going
+        // to always be 0
+
+        $carry = 0;
+
+        for ($j = 0; $j < $x_length; ++$j) { // ie. $i = 0
+            $temp = $x_value[$j] * $y_value[0] + $carry; // $product_value[$k] == 0
+            $carry = MATH_BIGINTEGER_BASE === 26 ? intval($temp / 0x4000000) : ($temp >> 31);
+            $product_value[$j] = (int) ($temp - MATH_BIGINTEGER_BASE_FULL * $carry);
+        }
+
+        $product_value[$j] = $carry;
+
+        // the above for loop is what the previous comment was talking about.  the
+        // following for loop is the "one with nested for loops"
+        for ($i = 1; $i < $y_length; ++$i) {
+            $carry = 0;
+
+            for ($j = 0, $k = $i; $j < $x_length; ++$j, ++$k) {
+                $temp = $product_value[$k] + $x_value[$j] * $y_value[$i] + $carry;
+                $carry = MATH_BIGINTEGER_BASE === 26 ? intval($temp / 0x4000000) : ($temp >> 31);
+                $product_value[$k] = (int) ($temp - MATH_BIGINTEGER_BASE_FULL * $carry);
+            }
+
+            $product_value[$k] = $carry;
+        }
+
+        return $product_value;
+    }
+
+    /**
+     * Performs Karatsuba multiplication on two BigIntegers
+     *
+     * See {@link http://en.wikipedia.org/wiki/Karatsuba_algorithm Karatsuba algorithm} and
+     * {@link http://math.libtomcrypt.com/files/tommath.pdf#page=120 MPM 5.2.3}.
+     *
+     * @param array $x_value
+     * @param array $y_value
+     * @return array
+     * @access private
+     */
+    function _karatsuba($x_value, $y_value)
+    {
+        $m = min(count($x_value) >> 1, count($y_value) >> 1);
+
+        if ($m < MATH_BIGINTEGER_KARATSUBA_CUTOFF) {
+            return $this->_regularMultiply($x_value, $y_value);
+        }
+
+        $x1 = array_slice($x_value, $m);
+        $x0 = array_slice($x_value, 0, $m);
+        $y1 = array_slice($y_value, $m);
+        $y0 = array_slice($y_value, 0, $m);
+
+        $z2 = $this->_karatsuba($x1, $y1);
+        $z0 = $this->_karatsuba($x0, $y0);
+
+        $z1 = $this->_add($x1, false, $x0, false);
+        $temp = $this->_add($y1, false, $y0, false);
+        $z1 = $this->_karatsuba($z1[MATH_BIGINTEGER_VALUE], $temp[MATH_BIGINTEGER_VALUE]);
+        $temp = $this->_add($z2, false, $z0, false);
+        $z1 = $this->_subtract($z1, false, $temp[MATH_BIGINTEGER_VALUE], false);
+
+        $z2 = array_merge(array_fill(0, 2 * $m, 0), $z2);
+        $z1[MATH_BIGINTEGER_VALUE] = array_merge(array_fill(0, $m, 0), $z1[MATH_BIGINTEGER_VALUE]);
+
+        $xy = $this->_add($z2, false, $z1[MATH_BIGINTEGER_VALUE], $z1[MATH_BIGINTEGER_SIGN]);
+        $xy = $this->_add($xy[MATH_BIGINTEGER_VALUE], $xy[MATH_BIGINTEGER_SIGN], $z0, false);
+
+        return $xy[MATH_BIGINTEGER_VALUE];
+    }
+
+    /**
+     * Performs squaring
+     *
+     * @param array $x
+     * @return array
+     * @access private
+     */
+    function _square($x = false)
+    {
+        return count($x) < 2 * MATH_BIGINTEGER_KARATSUBA_CUTOFF ?
+            $this->_trim($this->_baseSquare($x)) :
+            $this->_trim($this->_karatsubaSquare($x));
+    }
+
+    /**
+     * Performs traditional squaring on two BigIntegers
+     *
+     * Squaring can be done faster than multiplying a number by itself can be.  See
+     * {@link http://www.cacr.math.uwaterloo.ca/hac/about/chap14.pdf#page=7 HAC 14.2.4} /
+     * {@link http://math.libtomcrypt.com/files/tommath.pdf#page=141 MPM 5.3} for more information.
+     *
+     * @param array $value
+     * @return array
+     * @access private
+     */
+    function _baseSquare($value)
+    {
+        if (empty($value)) {
+            return array();
+        }
+        $square_value = $this->_array_repeat(0, 2 * count($value));
+
+        for ($i = 0, $max_index = count($value) - 1; $i <= $max_index; ++$i) {
+            $i2 = $i << 1;
+
+            $temp = $square_value[$i2] + $value[$i] * $value[$i];
+            $carry = MATH_BIGINTEGER_BASE === 26 ? intval($temp / 0x4000000) : ($temp >> 31);
+            $square_value[$i2] = (int) ($temp - MATH_BIGINTEGER_BASE_FULL * $carry);
+
+            // note how we start from $i+1 instead of 0 as we do in multiplication.
+            for ($j = $i + 1, $k = $i2 + 1; $j <= $max_index; ++$j, ++$k) {
+                $temp = $square_value[$k] + 2 * $value[$j] * $value[$i] + $carry;
+                $carry = MATH_BIGINTEGER_BASE === 26 ? intval($temp / 0x4000000) : ($temp >> 31);
+                $square_value[$k] = (int) ($temp - MATH_BIGINTEGER_BASE_FULL * $carry);
+            }
+
+            // the following line can yield values larger 2**15.  at this point, PHP should switch
+            // over to floats.
+            $square_value[$i + $max_index + 1] = $carry;
+        }
+
+        return $square_value;
+    }
+
+    /**
+     * Performs Karatsuba "squaring" on two BigIntegers
+     *
+     * See {@link http://en.wikipedia.org/wiki/Karatsuba_algorithm Karatsuba algorithm} and
+     * {@link http://math.libtomcrypt.com/files/tommath.pdf#page=151 MPM 5.3.4}.
+     *
+     * @param array $value
+     * @return array
+     * @access private
+     */
+    function _karatsubaSquare($value)
+    {
+        $m = count($value) >> 1;
+
+        if ($m < MATH_BIGINTEGER_KARATSUBA_CUTOFF) {
+            return $this->_baseSquare($value);
+        }
+
+        $x1 = array_slice($value, $m);
+        $x0 = array_slice($value, 0, $m);
+
+        $z2 = $this->_karatsubaSquare($x1);
+        $z0 = $this->_karatsubaSquare($x0);
+
+        $z1 = $this->_add($x1, false, $x0, false);
+        $z1 = $this->_karatsubaSquare($z1[MATH_BIGINTEGER_VALUE]);
+        $temp = $this->_add($z2, false, $z0, false);
+        $z1 = $this->_subtract($z1, false, $temp[MATH_BIGINTEGER_VALUE], false);
+
+        $z2 = array_merge(array_fill(0, 2 * $m, 0), $z2);
+        $z1[MATH_BIGINTEGER_VALUE] = array_merge(array_fill(0, $m, 0), $z1[MATH_BIGINTEGER_VALUE]);
+
+        $xx = $this->_add($z2, false, $z1[MATH_BIGINTEGER_VALUE], $z1[MATH_BIGINTEGER_SIGN]);
+        $xx = $this->_add($xx[MATH_BIGINTEGER_VALUE], $xx[MATH_BIGINTEGER_SIGN], $z0, false);
+
+        return $xx[MATH_BIGINTEGER_VALUE];
+    }
+
+    /**
+     * Divides two BigIntegers.
+     *
+     * Returns an array whose first element contains the quotient and whose second element contains the
+     * "common residue".  If the remainder would be positive, the "common residue" and the remainder are the
+     * same.  If the remainder would be negative, the "common residue" is equal to the sum of the remainder
+     * and the divisor (basically, the "common residue" is the first positive modulo).
+     *
+     * Here's an example:
+     * <code>
+     * <?php
+     *    include 'Math/BigInteger.php';
+     *
+     *    $a = new Math_BigInteger('10');
+     *    $b = new Math_BigInteger('20');
+     *
+     *    list($quotient, $remainder) = $a->divide($b);
+     *
+     *    echo $quotient->toString(); // outputs 0
+     *    echo "\r\n";
+     *    echo $remainder->toString(); // outputs 10
+     * ?>
+     * </code>
+     *
+     * @param Math_BigInteger $y
+     * @return array
+     * @access public
+     * @internal This function is based off of {@link http://www.cacr.math.uwaterloo.ca/hac/about/chap14.pdf#page=9 HAC 14.20}.
+     */
+    function divide($y)
+    {
+        switch (MATH_BIGINTEGER_MODE) {
+            case MATH_BIGINTEGER_MODE_GMP:
+                $quotient = new Math_BigInteger();
+                $remainder = new Math_BigInteger();
+
+                list($quotient->value, $remainder->value) = gmp_div_qr($this->value, $y->value);
+
+                if (gmp_sign($remainder->value) < 0) {
+                    $remainder->value = gmp_add($remainder->value, gmp_abs($y->value));
+                }
+
+                return array($this->_normalize($quotient), $this->_normalize($remainder));
+            case MATH_BIGINTEGER_MODE_BCMATH:
+                $quotient = new Math_BigInteger();
+                $remainder = new Math_BigInteger();
+
+                $quotient->value = bcdiv($this->value, $y->value, 0);
+                $remainder->value = bcmod($this->value, $y->value);
+
+                if ($remainder->value[0] == '-') {
+                    $remainder->value = bcadd($remainder->value, $y->value[0] == '-' ? substr($y->value, 1) : $y->value, 0);
+                }
+
+                return array($this->_normalize($quotient), $this->_normalize($remainder));
+        }
+
+        if (count($y->value) == 1) {
+            list($q, $r) = $this->_divide_digit($this->value, $y->value[0]);
+            $quotient = new Math_BigInteger();
+            $remainder = new Math_BigInteger();
+            $quotient->value = $q;
+            $remainder->value = array($r);
+            $quotient->is_negative = $this->is_negative != $y->is_negative;
+            return array($this->_normalize($quotient), $this->_normalize($remainder));
+        }
+
+        static $zero;
+        if (!isset($zero)) {
+            $zero = new Math_BigInteger();
+        }
+
+        $x = $this->copy();
+        $y = $y->copy();
+
+        $x_sign = $x->is_negative;
+        $y_sign = $y->is_negative;
+
+        $x->is_negative = $y->is_negative = false;
+
+        $diff = $x->compare($y);
+
+        if (!$diff) {
+            $temp = new Math_BigInteger();
+            $temp->value = array(1);
+            $temp->is_negative = $x_sign != $y_sign;
+            return array($this->_normalize($temp), $this->_normalize(new Math_BigInteger()));
+        }
+
+        if ($diff < 0) {
+            // if $x is negative, "add" $y.
+            if ($x_sign) {
+                $x = $y->subtract($x);
+            }
+            return array($this->_normalize(new Math_BigInteger()), $this->_normalize($x));
+        }
+
+        // normalize $x and $y as described in HAC 14.23 / 14.24
+        $msb = $y->value[count($y->value) - 1];
+        for ($shift = 0; !($msb & MATH_BIGINTEGER_MSB); ++$shift) {
+            $msb <<= 1;
+        }
+        $x->_lshift($shift);
+        $y->_lshift($shift);
+        $y_value = &$y->value;
+
+        $x_max = count($x->value) - 1;
+        $y_max = count($y->value) - 1;
+
+        $quotient = new Math_BigInteger();
+        $quotient_value = &$quotient->value;
+        $quotient_value = $this->_array_repeat(0, $x_max - $y_max + 1);
+
+        static $temp, $lhs, $rhs;
+        if (!isset($temp)) {
+            $temp = new Math_BigInteger();
+            $lhs =  new Math_BigInteger();
+            $rhs =  new Math_BigInteger();
+        }
+        $temp_value = &$temp->value;
+        $rhs_value =  &$rhs->value;
+
+        // $temp = $y << ($x_max - $y_max-1) in base 2**26
+        $temp_value = array_merge($this->_array_repeat(0, $x_max - $y_max), $y_value);
+
+        while ($x->compare($temp) >= 0) {
+            // calculate the "common residue"
+            ++$quotient_value[$x_max - $y_max];
+            $x = $x->subtract($temp);
+            $x_max = count($x->value) - 1;
+        }
+
+        for ($i = $x_max; $i >= $y_max + 1; --$i) {
+            $x_value = &$x->value;
+            $x_window = array(
+                isset($x_value[$i]) ? $x_value[$i] : 0,
+                isset($x_value[$i - 1]) ? $x_value[$i - 1] : 0,
+                isset($x_value[$i - 2]) ? $x_value[$i - 2] : 0
+            );
+            $y_window = array(
+                $y_value[$y_max],
+                ($y_max > 0) ? $y_value[$y_max - 1] : 0
+            );
+
+            $q_index = $i - $y_max - 1;
+            if ($x_window[0] == $y_window[0]) {
+                $quotient_value[$q_index] = MATH_BIGINTEGER_MAX_DIGIT;
+            } else {
+                $quotient_value[$q_index] = $this->_safe_divide(
+                    $x_window[0] * MATH_BIGINTEGER_BASE_FULL + $x_window[1],
+                    $y_window[0]
+                );
+            }
+
+            $temp_value = array($y_window[1], $y_window[0]);
+
+            $lhs->value = array($quotient_value[$q_index]);
+            $lhs = $lhs->multiply($temp);
+
+            $rhs_value = array($x_window[2], $x_window[1], $x_window[0]);
+
+            while ($lhs->compare($rhs) > 0) {
+                --$quotient_value[$q_index];
+
+                $lhs->value = array($quotient_value[$q_index]);
+                $lhs = $lhs->multiply($temp);
+            }
+
+            $adjust = $this->_array_repeat(0, $q_index);
+            $temp_value = array($quotient_value[$q_index]);
+            $temp = $temp->multiply($y);
+            $temp_value = &$temp->value;
+            $temp_value = array_merge($adjust, $temp_value);
+
+            $x = $x->subtract($temp);
+
+            if ($x->compare($zero) < 0) {
+                $temp_value = array_merge($adjust, $y_value);
+                $x = $x->add($temp);
+
+                --$quotient_value[$q_index];
+            }
+
+            $x_max = count($x_value) - 1;
+        }
+
+        // unnormalize the remainder
+        $x->_rshift($shift);
+
+        $quotient->is_negative = $x_sign != $y_sign;
+
+        // calculate the "common residue", if appropriate
+        if ($x_sign) {
+            $y->_rshift($shift);
+            $x = $y->subtract($x);
+        }
+
+        return array($this->_normalize($quotient), $this->_normalize($x));
+    }
+
+    /**
+     * Divides a BigInteger by a regular integer
+     *
+     * abc / x = a00 / x + b0 / x + c / x
+     *
+     * @param array $dividend
+     * @param array $divisor
+     * @return array
+     * @access private
+     */
+    function _divide_digit($dividend, $divisor)
+    {
+        $carry = 0;
+        $result = array();
+
+        for ($i = count($dividend) - 1; $i >= 0; --$i) {
+            $temp = MATH_BIGINTEGER_BASE_FULL * $carry + $dividend[$i];
+            $result[$i] = $this->_safe_divide($temp, $divisor);
+            $carry = (int) ($temp - $divisor * $result[$i]);
+        }
+
+        return array($result, $carry);
+    }
+
+    /**
+     * Performs modular exponentiation.
+     *
+     * Here's an example:
+     * <code>
+     * <?php
+     *    include 'Math/BigInteger.php';
+     *
+     *    $a = new Math_BigInteger('10');
+     *    $b = new Math_BigInteger('20');
+     *    $c = new Math_BigInteger('30');
+     *
+     *    $c = $a->modPow($b, $c);
+     *
+     *    echo $c->toString(); // outputs 10
+     * ?>
+     * </code>
+     *
+     * @param Math_BigInteger $e
+     * @param Math_BigInteger $n
+     * @return Math_BigInteger
+     * @access public
+     * @internal The most naive approach to modular exponentiation has very unreasonable requirements, and
+     *    and although the approach involving repeated squaring does vastly better, it, too, is impractical
+     *    for our purposes.  The reason being that division - by far the most complicated and time-consuming
+     *    of the basic operations (eg. +,-,*,/) - occurs multiple times within it.
+     *
+     *    Modular reductions resolve this issue.  Although an individual modular reduction takes more time
+     *    then an individual division, when performed in succession (with the same modulo), they're a lot faster.
+     *
+     *    The two most commonly used modular reductions are Barrett and Montgomery reduction.  Montgomery reduction,
+     *    although faster, only works when the gcd of the modulo and of the base being used is 1.  In RSA, when the
+     *    base is a power of two, the modulo - a product of two primes - is always going to have a gcd of 1 (because
+     *    the product of two odd numbers is odd), but what about when RSA isn't used?
+     *
+     *    In contrast, Barrett reduction has no such constraint.  As such, some bigint implementations perform a
+     *    Barrett reduction after every operation in the modpow function.  Others perform Barrett reductions when the
+     *    modulo is even and Montgomery reductions when the modulo is odd.  BigInteger.java's modPow method, however,
+     *    uses a trick involving the Chinese Remainder Theorem to factor the even modulo into two numbers - one odd and
+     *    the other, a power of two - and recombine them, later.  This is the method that this modPow function uses.
+     *    {@link http://islab.oregonstate.edu/papers/j34monex.pdf Montgomery Reduction with Even Modulus} elaborates.
+     */
+    function modPow($e, $n)
+    {
+        $n = $this->bitmask !== false && $this->bitmask->compare($n) < 0 ? $this->bitmask : $n->abs();
+
+        if ($e->compare(new Math_BigInteger()) < 0) {
+            $e = $e->abs();
+
+            $temp = $this->modInverse($n);
+            if ($temp === false) {
+                return false;
+            }
+
+            return $this->_normalize($temp->modPow($e, $n));
+        }
+
+        if (MATH_BIGINTEGER_MODE == MATH_BIGINTEGER_MODE_GMP) {
+            $temp = new Math_BigInteger();
+            $temp->value = gmp_powm($this->value, $e->value, $n->value);
+
+            return $this->_normalize($temp);
+        }
+
+        if ($this->compare(new Math_BigInteger()) < 0 || $this->compare($n) > 0) {
+            list(, $temp) = $this->divide($n);
+            return $temp->modPow($e, $n);
+        }
+
+        if (defined('MATH_BIGINTEGER_OPENSSL_ENABLED')) {
+            $components = array(
+                'modulus' => $n->toBytes(true),
+                'publicExponent' => $e->toBytes(true)
+            );
+
+            $components = array(
+                'modulus' => pack('Ca*a*', 2, $this->_encodeASN1Length(strlen($components['modulus'])), $components['modulus']),
+                'publicExponent' => pack('Ca*a*', 2, $this->_encodeASN1Length(strlen($components['publicExponent'])), $components['publicExponent'])
+            );
+
+            $RSAPublicKey = pack(
+                'Ca*a*a*',
+                48,
+                $this->_encodeASN1Length(strlen($components['modulus']) + strlen($components['publicExponent'])),
+                $components['modulus'],
+                $components['publicExponent']
+            );
+
+            $rsaOID = pack('H*', '300d06092a864886f70d0101010500'); // hex version of MA0GCSqGSIb3DQEBAQUA
+            $RSAPublicKey = chr(0) . $RSAPublicKey;
+            $RSAPublicKey = chr(3) . $this->_encodeASN1Length(strlen($RSAPublicKey)) . $RSAPublicKey;
+
+            $encapsulated = pack(
+                'Ca*a*',
+                48,
+                $this->_encodeASN1Length(strlen($rsaOID . $RSAPublicKey)),
+                $rsaOID . $RSAPublicKey
+            );
+
+            $RSAPublicKey = "-----BEGIN PUBLIC KEY-----\r\n" .
+                             chunk_split(base64_encode($encapsulated)) .
+                             '-----END PUBLIC KEY-----';
+
+            $plaintext = str_pad($this->toBytes(), strlen($n->toBytes(true)) - 1, "\0", STR_PAD_LEFT);
+
+            if (openssl_public_encrypt($plaintext, $result, $RSAPublicKey, OPENSSL_NO_PADDING)) {
+                return new Math_BigInteger($result, 256);
+            }
+        }
+
+        if (MATH_BIGINTEGER_MODE == MATH_BIGINTEGER_MODE_BCMATH) {
+            $temp = new Math_BigInteger();
+            $temp->value = bcpowmod($this->value, $e->value, $n->value, 0);
+
+            return $this->_normalize($temp);
+        }
+
+        if (empty($e->value)) {
+            $temp = new Math_BigInteger();
+            $temp->value = array(1);
+            return $this->_normalize($temp);
+        }
+
+        if ($e->value == array(1)) {
+            list(, $temp) = $this->divide($n);
+            return $this->_normalize($temp);
+        }
+
+        if ($e->value == array(2)) {
+            $temp = new Math_BigInteger();
+            $temp->value = $this->_square($this->value);
+            list(, $temp) = $temp->divide($n);
+            return $this->_normalize($temp);
+        }
+
+        return $this->_normalize($this->_slidingWindow($e, $n, MATH_BIGINTEGER_BARRETT));
+
+        // the following code, although not callable, can be run independently of the above code
+        // although the above code performed better in my benchmarks the following could might
+        // perform better under different circumstances. in lieu of deleting it it's just been
+        // made uncallable
+
+        // is the modulo odd?
+        if ($n->value[0] & 1) {
+            return $this->_normalize($this->_slidingWindow($e, $n, MATH_BIGINTEGER_MONTGOMERY));
+        }
+        // if it's not, it's even
+
+        // find the lowest set bit (eg. the max pow of 2 that divides $n)
+        for ($i = 0; $i < count($n->value); ++$i) {
+            if ($n->value[$i]) {
+                $temp = decbin($n->value[$i]);
+                $j = strlen($temp) - strrpos($temp, '1') - 1;
+                $j+= 26 * $i;
+                break;
+            }
+        }
+        // at this point, 2^$j * $n/(2^$j) == $n
+
+        $mod1 = $n->copy();
+        $mod1->_rshift($j);
+        $mod2 = new Math_BigInteger();
+        $mod2->value = array(1);
+        $mod2->_lshift($j);
+
+        $part1 = ($mod1->value != array(1)) ? $this->_slidingWindow($e, $mod1, MATH_BIGINTEGER_MONTGOMERY) : new Math_BigInteger();
+        $part2 = $this->_slidingWindow($e, $mod2, MATH_BIGINTEGER_POWEROF2);
+
+        $y1 = $mod2->modInverse($mod1);
+        $y2 = $mod1->modInverse($mod2);
+
+        $result = $part1->multiply($mod2);
+        $result = $result->multiply($y1);
+
+        $temp = $part2->multiply($mod1);
+        $temp = $temp->multiply($y2);
+
+        $result = $result->add($temp);
+        list(, $result) = $result->divide($n);
+
+        return $this->_normalize($result);
+    }
+
+    /**
+     * Performs modular exponentiation.
+     *
+     * Alias for Math_BigInteger::modPow()
+     *
+     * @param Math_BigInteger $e
+     * @param Math_BigInteger $n
+     * @return Math_BigInteger
+     * @access public
+     */
+    function powMod($e, $n)
+    {
+        return $this->modPow($e, $n);
+    }
+
+    /**
+     * Sliding Window k-ary Modular Exponentiation
+     *
+     * Based on {@link http://www.cacr.math.uwaterloo.ca/hac/about/chap14.pdf#page=27 HAC 14.85} /
+     * {@link http://math.libtomcrypt.com/files/tommath.pdf#page=210 MPM 7.7}.  In a departure from those algorithims,
+     * however, this function performs a modular reduction after every multiplication and squaring operation.
+     * As such, this function has the same preconditions that the reductions being used do.
+     *
+     * @param Math_BigInteger $e
+     * @param Math_BigInteger $n
+     * @param int $mode
+     * @return Math_BigInteger
+     * @access private
+     */
+    function _slidingWindow($e, $n, $mode)
+    {
+        static $window_ranges = array(7, 25, 81, 241, 673, 1793); // from BigInteger.java's oddModPow function
+        //static $window_ranges = array(0, 7, 36, 140, 450, 1303, 3529); // from MPM 7.3.1
+
+        $e_value = $e->value;
+        $e_length = count($e_value) - 1;
+        $e_bits = decbin($e_value[$e_length]);
+        for ($i = $e_length - 1; $i >= 0; --$i) {
+            $e_bits.= str_pad(decbin($e_value[$i]), MATH_BIGINTEGER_BASE, '0', STR_PAD_LEFT);
+        }
+
+        $e_length = strlen($e_bits);
+
+        // calculate the appropriate window size.
+        // $window_size == 3 if $window_ranges is between 25 and 81, for example.
+        for ($i = 0, $window_size = 1; $i < count($window_ranges) && $e_length > $window_ranges[$i]; ++$window_size, ++$i) {
+        }
+
+        $n_value = $n->value;
+
+        // precompute $this^0 through $this^$window_size
+        $powers = array();
+        $powers[1] = $this->_prepareReduce($this->value, $n_value, $mode);
+        $powers[2] = $this->_squareReduce($powers[1], $n_value, $mode);
+
+        // we do every other number since substr($e_bits, $i, $j+1) (see below) is supposed to end
+        // in a 1.  ie. it's supposed to be odd.
+        $temp = 1 << ($window_size - 1);
+        for ($i = 1; $i < $temp; ++$i) {
+            $i2 = $i << 1;
+            $powers[$i2 + 1] = $this->_multiplyReduce($powers[$i2 - 1], $powers[2], $n_value, $mode);
+        }
+
+        $result = array(1);
+        $result = $this->_prepareReduce($result, $n_value, $mode);
+
+        for ($i = 0; $i < $e_length;) {
+            if (!$e_bits[$i]) {
+                $result = $this->_squareReduce($result, $n_value, $mode);
+                ++$i;
+            } else {
+                for ($j = $window_size - 1; $j > 0; --$j) {
+                    if (!empty($e_bits[$i + $j])) {
+                        break;
+                    }
+                }
+
+                // eg. the length of substr($e_bits, $i, $j + 1)
+                for ($k = 0; $k <= $j; ++$k) {
+                    $result = $this->_squareReduce($result, $n_value, $mode);
+                }
+
+                $result = $this->_multiplyReduce($result, $powers[bindec(substr($e_bits, $i, $j + 1))], $n_value, $mode);
+
+                $i += $j + 1;
+            }
+        }
+
+        $temp = new Math_BigInteger();
+        $temp->value = $this->_reduce($result, $n_value, $mode);
+
+        return $temp;
+    }
+
+    /**
+     * Modular reduction
+     *
+     * For most $modes this will return the remainder.
+     *
+     * @see self::_slidingWindow()
+     * @access private
+     * @param array $x
+     * @param array $n
+     * @param int $mode
+     * @return array
+     */
+    function _reduce($x, $n, $mode)
+    {
+        switch ($mode) {
+            case MATH_BIGINTEGER_MONTGOMERY:
+                return $this->_montgomery($x, $n);
+            case MATH_BIGINTEGER_BARRETT:
+                return $this->_barrett($x, $n);
+            case MATH_BIGINTEGER_POWEROF2:
+                $lhs = new Math_BigInteger();
+                $lhs->value = $x;
+                $rhs = new Math_BigInteger();
+                $rhs->value = $n;
+                return $x->_mod2($n);
+            case MATH_BIGINTEGER_CLASSIC:
+                $lhs = new Math_BigInteger();
+                $lhs->value = $x;
+                $rhs = new Math_BigInteger();
+                $rhs->value = $n;
+                list(, $temp) = $lhs->divide($rhs);
+                return $temp->value;
+            case MATH_BIGINTEGER_NONE:
+                return $x;
+            default:
+                // an invalid $mode was provided
+        }
+    }
+
+    /**
+     * Modular reduction preperation
+     *
+     * @see self::_slidingWindow()
+     * @access private
+     * @param array $x
+     * @param array $n
+     * @param int $mode
+     * @return array
+     */
+    function _prepareReduce($x, $n, $mode)
+    {
+        if ($mode == MATH_BIGINTEGER_MONTGOMERY) {
+            return $this->_prepMontgomery($x, $n);
+        }
+        return $this->_reduce($x, $n, $mode);
+    }
+
+    /**
+     * Modular multiply
+     *
+     * @see self::_slidingWindow()
+     * @access private
+     * @param array $x
+     * @param array $y
+     * @param array $n
+     * @param int $mode
+     * @return array
+     */
+    function _multiplyReduce($x, $y, $n, $mode)
+    {
+        if ($mode == MATH_BIGINTEGER_MONTGOMERY) {
+            return $this->_montgomeryMultiply($x, $y, $n);
+        }
+        $temp = $this->_multiply($x, false, $y, false);
+        return $this->_reduce($temp[MATH_BIGINTEGER_VALUE], $n, $mode);
+    }
+
+    /**
+     * Modular square
+     *
+     * @see self::_slidingWindow()
+     * @access private
+     * @param array $x
+     * @param array $n
+     * @param int $mode
+     * @return array
+     */
+    function _squareReduce($x, $n, $mode)
+    {
+        if ($mode == MATH_BIGINTEGER_MONTGOMERY) {
+            return $this->_montgomeryMultiply($x, $x, $n);
+        }
+        return $this->_reduce($this->_square($x), $n, $mode);
+    }
+
+    /**
+     * Modulos for Powers of Two
+     *
+     * Calculates $x%$n, where $n = 2**$e, for some $e.  Since this is basically the same as doing $x & ($n-1),
+     * we'll just use this function as a wrapper for doing that.
+     *
+     * @see self::_slidingWindow()
+     * @access private
+     * @param Math_BigInteger
+     * @return Math_BigInteger
+     */
+    function _mod2($n)
+    {
+        $temp = new Math_BigInteger();
+        $temp->value = array(1);
+        return $this->bitwise_and($n->subtract($temp));
+    }
+
+    /**
+     * Barrett Modular Reduction
+     *
+     * See {@link http://www.cacr.math.uwaterloo.ca/hac/about/chap14.pdf#page=14 HAC 14.3.3} /
+     * {@link http://math.libtomcrypt.com/files/tommath.pdf#page=165 MPM 6.2.5} for more information.  Modified slightly,
+     * so as not to require negative numbers (initially, this script didn't support negative numbers).
+     *
+     * Employs "folding", as described at
+     * {@link http://www.cosic.esat.kuleuven.be/publications/thesis-149.pdf#page=66 thesis-149.pdf#page=66}.  To quote from
+     * it, "the idea [behind folding] is to find a value x' such that x (mod m) = x' (mod m), with x' being smaller than x."
+     *
+     * Unfortunately, the "Barrett Reduction with Folding" algorithm described in thesis-149.pdf is not, as written, all that
+     * usable on account of (1) its not using reasonable radix points as discussed in
+     * {@link http://math.libtomcrypt.com/files/tommath.pdf#page=162 MPM 6.2.2} and (2) the fact that, even with reasonable
+     * radix points, it only works when there are an even number of digits in the denominator.  The reason for (2) is that
+     * (x >> 1) + (x >> 1) != x / 2 + x / 2.  If x is even, they're the same, but if x is odd, they're not.  See the in-line
+     * comments for details.
+     *
+     * @see self::_slidingWindow()
+     * @access private
+     * @param array $n
+     * @param array $m
+     * @return array
+     */
+    function _barrett($n, $m)
+    {
+        static $cache = array(
+            MATH_BIGINTEGER_VARIABLE => array(),
+            MATH_BIGINTEGER_DATA => array()
+        );
+
+        $m_length = count($m);
+
+        // if ($this->_compare($n, $this->_square($m)) >= 0) {
+        if (count($n) > 2 * $m_length) {
+            $lhs = new Math_BigInteger();
+            $rhs = new Math_BigInteger();
+            $lhs->value = $n;
+            $rhs->value = $m;
+            list(, $temp) = $lhs->divide($rhs);
+            return $temp->value;
+        }
+
+        // if (m.length >> 1) + 2 <= m.length then m is too small and n can't be reduced
+        if ($m_length < 5) {
+            return $this->_regularBarrett($n, $m);
+        }
+
+        // n = 2 * m.length
+
+        if (($key = array_search($m, $cache[MATH_BIGINTEGER_VARIABLE])) === false) {
+            $key = count($cache[MATH_BIGINTEGER_VARIABLE]);
+            $cache[MATH_BIGINTEGER_VARIABLE][] = $m;
+
+            $lhs = new Math_BigInteger();
+            $lhs_value = &$lhs->value;
+            $lhs_value = $this->_array_repeat(0, $m_length + ($m_length >> 1));
+            $lhs_value[] = 1;
+            $rhs = new Math_BigInteger();
+            $rhs->value = $m;
+
+            list($u, $m1) = $lhs->divide($rhs);
+            $u = $u->value;
+            $m1 = $m1->value;
+
+            $cache[MATH_BIGINTEGER_DATA][] = array(
+                'u' => $u, // m.length >> 1 (technically (m.length >> 1) + 1)
+                'm1'=> $m1 // m.length
+            );
+        } else {
+            extract($cache[MATH_BIGINTEGER_DATA][$key]);
+        }
+
+        $cutoff = $m_length + ($m_length >> 1);
+        $lsd = array_slice($n, 0, $cutoff); // m.length + (m.length >> 1)
+        $msd = array_slice($n, $cutoff);    // m.length >> 1
+        $lsd = $this->_trim($lsd);
+        $temp = $this->_multiply($msd, false, $m1, false);
+        $n = $this->_add($lsd, false, $temp[MATH_BIGINTEGER_VALUE], false); // m.length + (m.length >> 1) + 1
+
+        if ($m_length & 1) {
+            return $this->_regularBarrett($n[MATH_BIGINTEGER_VALUE], $m);
+        }
+
+        // (m.length + (m.length >> 1) + 1) - (m.length - 1) == (m.length >> 1) + 2
+        $temp = array_slice($n[MATH_BIGINTEGER_VALUE], $m_length - 1);
+        // if even: ((m.length >> 1) + 2) + (m.length >> 1) == m.length + 2
+        // if odd:  ((m.length >> 1) + 2) + (m.length >> 1) == (m.length - 1) + 2 == m.length + 1
+        $temp = $this->_multiply($temp, false, $u, false);
+        // if even: (m.length + 2) - ((m.length >> 1) + 1) = m.length - (m.length >> 1) + 1
+        // if odd:  (m.length + 1) - ((m.length >> 1) + 1) = m.length - (m.length >> 1)
+        $temp = array_slice($temp[MATH_BIGINTEGER_VALUE], ($m_length >> 1) + 1);
+        // if even: (m.length - (m.length >> 1) + 1) + m.length = 2 * m.length - (m.length >> 1) + 1
+        // if odd:  (m.length - (m.length >> 1)) + m.length     = 2 * m.length - (m.length >> 1)
+        $temp = $this->_multiply($temp, false, $m, false);
+
+        // at this point, if m had an odd number of digits, we'd be subtracting a 2 * m.length - (m.length >> 1) digit
+        // number from a m.length + (m.length >> 1) + 1 digit number.  ie. there'd be an extra digit and the while loop
+        // following this comment would loop a lot (hence our calling _regularBarrett() in that situation).
+
+        $result = $this->_subtract($n[MATH_BIGINTEGER_VALUE], false, $temp[MATH_BIGINTEGER_VALUE], false);
+
+        while ($this->_compare($result[MATH_BIGINTEGER_VALUE], $result[MATH_BIGINTEGER_SIGN], $m, false) >= 0) {
+            $result = $this->_subtract($result[MATH_BIGINTEGER_VALUE], $result[MATH_BIGINTEGER_SIGN], $m, false);
+        }
+
+        return $result[MATH_BIGINTEGER_VALUE];
+    }
+
+    /**
+     * (Regular) Barrett Modular Reduction
+     *
+     * For numbers with more than four digits Math_BigInteger::_barrett() is faster.  The difference between that and this
+     * is that this function does not fold the denominator into a smaller form.
+     *
+     * @see self::_slidingWindow()
+     * @access private
+     * @param array $x
+     * @param array $n
+     * @return array
+     */
+    function _regularBarrett($x, $n)
+    {
+        static $cache = array(
+            MATH_BIGINTEGER_VARIABLE => array(),
+            MATH_BIGINTEGER_DATA => array()
+        );
+
+        $n_length = count($n);
+
+        if (count($x) > 2 * $n_length) {
+            $lhs = new Math_BigInteger();
+            $rhs = new Math_BigInteger();
+            $lhs->value = $x;
+            $rhs->value = $n;
+            list(, $temp) = $lhs->divide($rhs);
+            return $temp->value;
+        }
+
+        if (($key = array_search($n, $cache[MATH_BIGINTEGER_VARIABLE])) === false) {
+            $key = count($cache[MATH_BIGINTEGER_VARIABLE]);
+            $cache[MATH_BIGINTEGER_VARIABLE][] = $n;
+            $lhs = new Math_BigInteger();
+            $lhs_value = &$lhs->value;
+            $lhs_value = $this->_array_repeat(0, 2 * $n_length);
+            $lhs_value[] = 1;
+            $rhs = new Math_BigInteger();
+            $rhs->value = $n;
+            list($temp, ) = $lhs->divide($rhs); // m.length
+            $cache[MATH_BIGINTEGER_DATA][] = $temp->value;
+        }
+
+        // 2 * m.length - (m.length - 1) = m.length + 1
+        $temp = array_slice($x, $n_length - 1);
+        // (m.length + 1) + m.length = 2 * m.length + 1
+        $temp = $this->_multiply($temp, false, $cache[MATH_BIGINTEGER_DATA][$key], false);
+        // (2 * m.length + 1) - (m.length - 1) = m.length + 2
+        $temp = array_slice($temp[MATH_BIGINTEGER_VALUE], $n_length + 1);
+
+        // m.length + 1
+        $result = array_slice($x, 0, $n_length + 1);
+        // m.length + 1
+        $temp = $this->_multiplyLower($temp, false, $n, false, $n_length + 1);
+        // $temp == array_slice($temp->_multiply($temp, false, $n, false)->value, 0, $n_length + 1)
+
+        if ($this->_compare($result, false, $temp[MATH_BIGINTEGER_VALUE], $temp[MATH_BIGINTEGER_SIGN]) < 0) {
+            $corrector_value = $this->_array_repeat(0, $n_length + 1);
+            $corrector_value[count($corrector_value)] = 1;
+            $result = $this->_add($result, false, $corrector_value, false);
+            $result = $result[MATH_BIGINTEGER_VALUE];
+        }
+
+        // at this point, we're subtracting a number with m.length + 1 digits from another number with m.length + 1 digits
+        $result = $this->_subtract($result, false, $temp[MATH_BIGINTEGER_VALUE], $temp[MATH_BIGINTEGER_SIGN]);
+        while ($this->_compare($result[MATH_BIGINTEGER_VALUE], $result[MATH_BIGINTEGER_SIGN], $n, false) > 0) {
+            $result = $this->_subtract($result[MATH_BIGINTEGER_VALUE], $result[MATH_BIGINTEGER_SIGN], $n, false);
+        }
+
+        return $result[MATH_BIGINTEGER_VALUE];
+    }
+
+    /**
+     * Performs long multiplication up to $stop digits
+     *
+     * If you're going to be doing array_slice($product->value, 0, $stop), some cycles can be saved.
+     *
+     * @see self::_regularBarrett()
+     * @param array $x_value
+     * @param bool $x_negative
+     * @param array $y_value
+     * @param bool $y_negative
+     * @param int $stop
+     * @return array
+     * @access private
+     */
+    function _multiplyLower($x_value, $x_negative, $y_value, $y_negative, $stop)
+    {
+        $x_length = count($x_value);
+        $y_length = count($y_value);
+
+        if (!$x_length || !$y_length) { // a 0 is being multiplied
+            return array(
+                MATH_BIGINTEGER_VALUE => array(),
+                MATH_BIGINTEGER_SIGN => false
+            );
+        }
+
+        if ($x_length < $y_length) {
+            $temp = $x_value;
+            $x_value = $y_value;
+            $y_value = $temp;
+
+            $x_length = count($x_value);
+            $y_length = count($y_value);
+        }
+
+        $product_value = $this->_array_repeat(0, $x_length + $y_length);
+
+        // the following for loop could be removed if the for loop following it
+        // (the one with nested for loops) initially set $i to 0, but
+        // doing so would also make the result in one set of unnecessary adds,
+        // since on the outermost loops first pass, $product->value[$k] is going
+        // to always be 0
+
+        $carry = 0;
+
+        for ($j = 0; $j < $x_length; ++$j) { // ie. $i = 0, $k = $i
+            $temp = $x_value[$j] * $y_value[0] + $carry; // $product_value[$k] == 0
+            $carry = MATH_BIGINTEGER_BASE === 26 ? intval($temp / 0x4000000) : ($temp >> 31);
+            $product_value[$j] = (int) ($temp - MATH_BIGINTEGER_BASE_FULL * $carry);
+        }
+
+        if ($j < $stop) {
+            $product_value[$j] = $carry;
+        }
+
+        // the above for loop is what the previous comment was talking about.  the
+        // following for loop is the "one with nested for loops"
+
+        for ($i = 1; $i < $y_length; ++$i) {
+            $carry = 0;
+
+            for ($j = 0, $k = $i; $j < $x_length && $k < $stop; ++$j, ++$k) {
+                $temp = $product_value[$k] + $x_value[$j] * $y_value[$i] + $carry;
+                $carry = MATH_BIGINTEGER_BASE === 26 ? intval($temp / 0x4000000) : ($temp >> 31);
+                $product_value[$k] = (int) ($temp - MATH_BIGINTEGER_BASE_FULL * $carry);
+            }
+
+            if ($k < $stop) {
+                $product_value[$k] = $carry;
+            }
+        }
+
+        return array(
+            MATH_BIGINTEGER_VALUE => $this->_trim($product_value),
+            MATH_BIGINTEGER_SIGN => $x_negative != $y_negative
+        );
+    }
+
+    /**
+     * Montgomery Modular Reduction
+     *
+     * ($x->_prepMontgomery($n))->_montgomery($n) yields $x % $n.
+     * {@link http://math.libtomcrypt.com/files/tommath.pdf#page=170 MPM 6.3} provides insights on how this can be
+     * improved upon (basically, by using the comba method).  gcd($n, 2) must be equal to one for this function
+     * to work correctly.
+     *
+     * @see self::_prepMontgomery()
+     * @see self::_slidingWindow()
+     * @access private
+     * @param array $x
+     * @param array $n
+     * @return array
+     */
+    function _montgomery($x, $n)
+    {
+        static $cache = array(
+            MATH_BIGINTEGER_VARIABLE => array(),
+            MATH_BIGINTEGER_DATA => array()
+        );
+
+        if (($key = array_search($n, $cache[MATH_BIGINTEGER_VARIABLE])) === false) {
+            $key = count($cache[MATH_BIGINTEGER_VARIABLE]);
+            $cache[MATH_BIGINTEGER_VARIABLE][] = $x;
+            $cache[MATH_BIGINTEGER_DATA][] = $this->_modInverse67108864($n);
+        }
+
+        $k = count($n);
+
+        $result = array(MATH_BIGINTEGER_VALUE => $x);
+
+        for ($i = 0; $i < $k; ++$i) {
+            $temp = $result[MATH_BIGINTEGER_VALUE][$i] * $cache[MATH_BIGINTEGER_DATA][$key];
+            $temp = $temp - MATH_BIGINTEGER_BASE_FULL * (MATH_BIGINTEGER_BASE === 26 ? intval($temp / 0x4000000) : ($temp >> 31));
+            $temp = $this->_regularMultiply(array($temp), $n);
+            $temp = array_merge($this->_array_repeat(0, $i), $temp);
+            $result = $this->_add($result[MATH_BIGINTEGER_VALUE], false, $temp, false);
+        }
+
+        $result[MATH_BIGINTEGER_VALUE] = array_slice($result[MATH_BIGINTEGER_VALUE], $k);
+
+        if ($this->_compare($result, false, $n, false) >= 0) {
+            $result = $this->_subtract($result[MATH_BIGINTEGER_VALUE], false, $n, false);
+        }
+
+        return $result[MATH_BIGINTEGER_VALUE];
+    }
+
+    /**
+     * Montgomery Multiply
+     *
+     * Interleaves the montgomery reduction and long multiplication algorithms together as described in
+     * {@link http://www.cacr.math.uwaterloo.ca/hac/about/chap14.pdf#page=13 HAC 14.36}
+     *
+     * @see self::_prepMontgomery()
+     * @see self::_montgomery()
+     * @access private
+     * @param array $x
+     * @param array $y
+     * @param array $m
+     * @return array
+     */
+    function _montgomeryMultiply($x, $y, $m)
+    {
+        $temp = $this->_multiply($x, false, $y, false);
+        return $this->_montgomery($temp[MATH_BIGINTEGER_VALUE], $m);
+
+        // the following code, although not callable, can be run independently of the above code
+        // although the above code performed better in my benchmarks the following could might
+        // perform better under different circumstances. in lieu of deleting it it's just been
+        // made uncallable
+
+        static $cache = array(
+            MATH_BIGINTEGER_VARIABLE => array(),
+            MATH_BIGINTEGER_DATA => array()
+        );
+
+        if (($key = array_search($m, $cache[MATH_BIGINTEGER_VARIABLE])) === false) {
+            $key = count($cache[MATH_BIGINTEGER_VARIABLE]);
+            $cache[MATH_BIGINTEGER_VARIABLE][] = $m;
+            $cache[MATH_BIGINTEGER_DATA][] = $this->_modInverse67108864($m);
+        }
+
+        $n = max(count($x), count($y), count($m));
+        $x = array_pad($x, $n, 0);
+        $y = array_pad($y, $n, 0);
+        $m = array_pad($m, $n, 0);
+        $a = array(MATH_BIGINTEGER_VALUE => $this->_array_repeat(0, $n + 1));
+        for ($i = 0; $i < $n; ++$i) {
+            $temp = $a[MATH_BIGINTEGER_VALUE][0] + $x[$i] * $y[0];
+            $temp = $temp - MATH_BIGINTEGER_BASE_FULL * (MATH_BIGINTEGER_BASE === 26 ? intval($temp / 0x4000000) : ($temp >> 31));
+            $temp = $temp * $cache[MATH_BIGINTEGER_DATA][$key];
+            $temp = $temp - MATH_BIGINTEGER_BASE_FULL * (MATH_BIGINTEGER_BASE === 26 ? intval($temp / 0x4000000) : ($temp >> 31));
+            $temp = $this->_add($this->_regularMultiply(array($x[$i]), $y), false, $this->_regularMultiply(array($temp), $m), false);
+            $a = $this->_add($a[MATH_BIGINTEGER_VALUE], false, $temp[MATH_BIGINTEGER_VALUE], false);
+            $a[MATH_BIGINTEGER_VALUE] = array_slice($a[MATH_BIGINTEGER_VALUE], 1);
+        }
+        if ($this->_compare($a[MATH_BIGINTEGER_VALUE], false, $m, false) >= 0) {
+            $a = $this->_subtract($a[MATH_BIGINTEGER_VALUE], false, $m, false);
+        }
+        return $a[MATH_BIGINTEGER_VALUE];
+    }
+
+    /**
+     * Prepare a number for use in Montgomery Modular Reductions
+     *
+     * @see self::_montgomery()
+     * @see self::_slidingWindow()
+     * @access private
+     * @param array $x
+     * @param array $n
+     * @return array
+     */
+    function _prepMontgomery($x, $n)
+    {
+        $lhs = new Math_BigInteger();
+        $lhs->value = array_merge($this->_array_repeat(0, count($n)), $x);
+        $rhs = new Math_BigInteger();
+        $rhs->value = $n;
+
+        list(, $temp) = $lhs->divide($rhs);
+        return $temp->value;
+    }
+
+    /**
+     * Modular Inverse of a number mod 2**26 (eg. 67108864)
+     *
+     * Based off of the bnpInvDigit function implemented and justified in the following URL:
+     *
+     * {@link http://www-cs-students.stanford.edu/~tjw/jsbn/jsbn.js}
+     *
+     * The following URL provides more info:
+     *
+     * {@link http://groups.google.com/group/sci.crypt/msg/7a137205c1be7d85}
+     *
+     * As for why we do all the bitmasking...  strange things can happen when converting from floats to ints. For
+     * instance, on some computers, var_dump((int) -4294967297) yields int(-1) and on others, it yields
+     * int(-2147483648).  To avoid problems stemming from this, we use bitmasks to guarantee that ints aren't
+     * auto-converted to floats.  The outermost bitmask is present because without it, there's no guarantee that
+     * the "residue" returned would be the so-called "common residue".  We use fmod, in the last step, because the
+     * maximum possible $x is 26 bits and the maximum $result is 16 bits.  Thus, we have to be able to handle up to
+     * 40 bits, which only 64-bit floating points will support.
+     *
+     * Thanks to Pedro Gimeno Fortea for input!
+     *
+     * @see self::_montgomery()
+     * @access private
+     * @param array $x
+     * @return int
+     */
+    function _modInverse67108864($x) // 2**26 == 67,108,864
+    {
+        $x = -$x[0];
+        $result = $x & 0x3; // x**-1 mod 2**2
+        $result = ($result * (2 - $x * $result)) & 0xF; // x**-1 mod 2**4
+        $result = ($result * (2 - ($x & 0xFF) * $result))  & 0xFF; // x**-1 mod 2**8
+        $result = ($result * ((2 - ($x & 0xFFFF) * $result) & 0xFFFF)) & 0xFFFF; // x**-1 mod 2**16
+        $result = fmod($result * (2 - fmod($x * $result, MATH_BIGINTEGER_BASE_FULL)), MATH_BIGINTEGER_BASE_FULL); // x**-1 mod 2**26
+        return $result & MATH_BIGINTEGER_MAX_DIGIT;
+    }
+
+    /**
+     * Calculates modular inverses.
+     *
+     * Say you have (30 mod 17 * x mod 17) mod 17 == 1.  x can be found using modular inverses.
+     *
+     * Here's an example:
+     * <code>
+     * <?php
+     *    include 'Math/BigInteger.php';
+     *
+     *    $a = new Math_BigInteger(30);
+     *    $b = new Math_BigInteger(17);
+     *
+     *    $c = $a->modInverse($b);
+     *    echo $c->toString(); // outputs 4
+     *
+     *    echo "\r\n";
+     *
+     *    $d = $a->multiply($c);
+     *    list(, $d) = $d->divide($b);
+     *    echo $d; // outputs 1 (as per the definition of modular inverse)
+     * ?>
+     * </code>
+     *
+     * @param Math_BigInteger $n
+     * @return Math_BigInteger|false
+     * @access public
+     * @internal See {@link http://www.cacr.math.uwaterloo.ca/hac/about/chap14.pdf#page=21 HAC 14.64} for more information.
+     */
+    function modInverse($n)
+    {
+        switch (MATH_BIGINTEGER_MODE) {
+            case MATH_BIGINTEGER_MODE_GMP:
+                $temp = new Math_BigInteger();
+                $temp->value = gmp_invert($this->value, $n->value);
+
+                return ($temp->value === false) ? false : $this->_normalize($temp);
+        }
+
+        static $zero, $one;
+        if (!isset($zero)) {
+            $zero = new Math_BigInteger();
+            $one = new Math_BigInteger(1);
+        }
+
+        // $x mod -$n == $x mod $n.
+        $n = $n->abs();
+
+        if ($this->compare($zero) < 0) {
+            $temp = $this->abs();
+            $temp = $temp->modInverse($n);
+            return $this->_normalize($n->subtract($temp));
+        }
+
+        extract($this->extendedGCD($n));
+
+        if (!$gcd->equals($one)) {
+            return false;
+        }
+
+        $x = $x->compare($zero) < 0 ? $x->add($n) : $x;
+
+        return $this->compare($zero) < 0 ? $this->_normalize($n->subtract($x)) : $this->_normalize($x);
+    }
+
+    /**
+     * Calculates the greatest common divisor and Bezout's identity.
+     *
+     * Say you have 693 and 609.  The GCD is 21.  Bezout's identity states that there exist integers x and y such that
+     * 693*x + 609*y == 21.  In point of fact, there are actually an infinite number of x and y combinations and which
+     * combination is returned is dependent upon which mode is in use.  See
+     * {@link http://en.wikipedia.org/wiki/B%C3%A9zout%27s_identity Bezout's identity - Wikipedia} for more information.
+     *
+     * Here's an example:
+     * <code>
+     * <?php
+     *    include 'Math/BigInteger.php';
+     *
+     *    $a = new Math_BigInteger(693);
+     *    $b = new Math_BigInteger(609);
+     *
+     *    extract($a->extendedGCD($b));
+     *
+     *    echo $gcd->toString() . "\r\n"; // outputs 21
+     *    echo $a->toString() * $x->toString() + $b->toString() * $y->toString(); // outputs 21
+     * ?>
+     * </code>
+     *
+     * @param Math_BigInteger $n
+     * @return Math_BigInteger
+     * @access public
+     * @internal Calculates the GCD using the binary xGCD algorithim described in
+     *    {@link http://www.cacr.math.uwaterloo.ca/hac/about/chap14.pdf#page=19 HAC 14.61}.  As the text above 14.61 notes,
+     *    the more traditional algorithim requires "relatively costly multiple-precision divisions".
+     */
+    function extendedGCD($n)
+    {
+        switch (MATH_BIGINTEGER_MODE) {
+            case MATH_BIGINTEGER_MODE_GMP:
+                extract(gmp_gcdext($this->value, $n->value));
+
+                return array(
+                    'gcd' => $this->_normalize(new Math_BigInteger($g)),
+                    'x'   => $this->_normalize(new Math_BigInteger($s)),
+                    'y'   => $this->_normalize(new Math_BigInteger($t))
+                );
+            case MATH_BIGINTEGER_MODE_BCMATH:
+                // it might be faster to use the binary xGCD algorithim here, as well, but (1) that algorithim works
+                // best when the base is a power of 2 and (2) i don't think it'd make much difference, anyway.  as is,
+                // the basic extended euclidean algorithim is what we're using.
+
+                $u = $this->value;
+                $v = $n->value;
+
+                $a = '1';
+                $b = '0';
+                $c = '0';
+                $d = '1';
+
+                while (bccomp($v, '0', 0) != 0) {
+                    $q = bcdiv($u, $v, 0);
+
+                    $temp = $u;
+                    $u = $v;
+                    $v = bcsub($temp, bcmul($v, $q, 0), 0);
+
+                    $temp = $a;
+                    $a = $c;
+                    $c = bcsub($temp, bcmul($a, $q, 0), 0);
+
+                    $temp = $b;
+                    $b = $d;
+                    $d = bcsub($temp, bcmul($b, $q, 0), 0);
+                }
+
+                return array(
+                    'gcd' => $this->_normalize(new Math_BigInteger($u)),
+                    'x'   => $this->_normalize(new Math_BigInteger($a)),
+                    'y'   => $this->_normalize(new Math_BigInteger($b))
+                );
+        }
+
+        $y = $n->copy();
+        $x = $this->copy();
+        $g = new Math_BigInteger();
+        $g->value = array(1);
+
+        while (!(($x->value[0] & 1)|| ($y->value[0] & 1))) {
+            $x->_rshift(1);
+            $y->_rshift(1);
+            $g->_lshift(1);
+        }
+
+        $u = $x->copy();
+        $v = $y->copy();
+
+        $a = new Math_BigInteger();
+        $b = new Math_BigInteger();
+        $c = new Math_BigInteger();
+        $d = new Math_BigInteger();
+
+        $a->value = $d->value = $g->value = array(1);
+        $b->value = $c->value = array();
+
+        while (!empty($u->value)) {
+            while (!($u->value[0] & 1)) {
+                $u->_rshift(1);
+                if ((!empty($a->value) && ($a->value[0] & 1)) || (!empty($b->value) && ($b->value[0] & 1))) {
+                    $a = $a->add($y);
+                    $b = $b->subtract($x);
+                }
+                $a->_rshift(1);
+                $b->_rshift(1);
+            }
+
+            while (!($v->value[0] & 1)) {
+                $v->_rshift(1);
+                if ((!empty($d->value) && ($d->value[0] & 1)) || (!empty($c->value) && ($c->value[0] & 1))) {
+                    $c = $c->add($y);
+                    $d = $d->subtract($x);
+                }
+                $c->_rshift(1);
+                $d->_rshift(1);
+            }
+
+            if ($u->compare($v) >= 0) {
+                $u = $u->subtract($v);
+                $a = $a->subtract($c);
+                $b = $b->subtract($d);
+            } else {
+                $v = $v->subtract($u);
+                $c = $c->subtract($a);
+                $d = $d->subtract($b);
+            }
+        }
+
+        return array(
+            'gcd' => $this->_normalize($g->multiply($v)),
+            'x'   => $this->_normalize($c),
+            'y'   => $this->_normalize($d)
+        );
+    }
+
+    /**
+     * Calculates the greatest common divisor
+     *
+     * Say you have 693 and 609.  The GCD is 21.
+     *
+     * Here's an example:
+     * <code>
+     * <?php
+     *    include 'Math/BigInteger.php';
+     *
+     *    $a = new Math_BigInteger(693);
+     *    $b = new Math_BigInteger(609);
+     *
+     *    $gcd = a->extendedGCD($b);
+     *
+     *    echo $gcd->toString() . "\r\n"; // outputs 21
+     * ?>
+     * </code>
+     *
+     * @param Math_BigInteger $n
+     * @return Math_BigInteger
+     * @access public
+     */
+    function gcd($n)
+    {
+        extract($this->extendedGCD($n));
+        return $gcd;
+    }
+
+    /**
+     * Absolute value.
+     *
+     * @return Math_BigInteger
+     * @access public
+     */
+    function abs()
+    {
+        $temp = new Math_BigInteger();
+
+        switch (MATH_BIGINTEGER_MODE) {
+            case MATH_BIGINTEGER_MODE_GMP:
+                $temp->value = gmp_abs($this->value);
+                break;
+            case MATH_BIGINTEGER_MODE_BCMATH:
+                $temp->value = (bccomp($this->value, '0', 0) < 0) ? substr($this->value, 1) : $this->value;
+                break;
+            default:
+                $temp->value = $this->value;
+        }
+
+        return $temp;
+    }
+
+    /**
+     * Compares two numbers.
+     *
+     * Although one might think !$x->compare($y) means $x != $y, it, in fact, means the opposite.  The reason for this is
+     * demonstrated thusly:
+     *
+     * $x  > $y: $x->compare($y)  > 0
+     * $x  < $y: $x->compare($y)  < 0
+     * $x == $y: $x->compare($y) == 0
+     *
+     * Note how the same comparison operator is used.  If you want to test for equality, use $x->equals($y).
+     *
+     * @param Math_BigInteger $y
+     * @return int < 0 if $this is less than $y; > 0 if $this is greater than $y, and 0 if they are equal.
+     * @access public
+     * @see self::equals()
+     * @internal Could return $this->subtract($x), but that's not as fast as what we do do.
+     */
+    function compare($y)
+    {
+        switch (MATH_BIGINTEGER_MODE) {
+            case MATH_BIGINTEGER_MODE_GMP:
+                return gmp_cmp($this->value, $y->value);
+            case MATH_BIGINTEGER_MODE_BCMATH:
+                return bccomp($this->value, $y->value, 0);
+        }
+
+        return $this->_compare($this->value, $this->is_negative, $y->value, $y->is_negative);
+    }
+
+    /**
+     * Compares two numbers.
+     *
+     * @param array $x_value
+     * @param bool $x_negative
+     * @param array $y_value
+     * @param bool $y_negative
+     * @return int
+     * @see self::compare()
+     * @access private
+     */
+    function _compare($x_value, $x_negative, $y_value, $y_negative)
+    {
+        if ($x_negative != $y_negative) {
+            return (!$x_negative && $y_negative) ? 1 : -1;
+        }
+
+        $result = $x_negative ? -1 : 1;
+
+        if (count($x_value) != count($y_value)) {
+            return (count($x_value) > count($y_value)) ? $result : -$result;
+        }
+        $size = max(count($x_value), count($y_value));
+
+        $x_value = array_pad($x_value, $size, 0);
+        $y_value = array_pad($y_value, $size, 0);
+
+        for ($i = count($x_value) - 1; $i >= 0; --$i) {
+            if ($x_value[$i] != $y_value[$i]) {
+                return ($x_value[$i] > $y_value[$i]) ? $result : -$result;
+            }
+        }
+
+        return 0;
+    }
+
+    /**
+     * Tests the equality of two numbers.
+     *
+     * If you need to see if one number is greater than or less than another number, use Math_BigInteger::compare()
+     *
+     * @param Math_BigInteger $x
+     * @return bool
+     * @access public
+     * @see self::compare()
+     */
+    function equals($x)
+    {
+        switch (MATH_BIGINTEGER_MODE) {
+            case MATH_BIGINTEGER_MODE_GMP:
+                return gmp_cmp($this->value, $x->value) == 0;
+            default:
+                return $this->value === $x->value && $this->is_negative == $x->is_negative;
+        }
+    }
+
+    /**
+     * Set Precision
+     *
+     * Some bitwise operations give different results depending on the precision being used.  Examples include left
+     * shift, not, and rotates.
+     *
+     * @param int $bits
+     * @access public
+     */
+    function setPrecision($bits)
+    {
+        $this->precision = $bits;
+        if (MATH_BIGINTEGER_MODE != MATH_BIGINTEGER_MODE_BCMATH) {
+            $this->bitmask = new Math_BigInteger(chr((1 << ($bits & 0x7)) - 1) . str_repeat(chr(0xFF), $bits >> 3), 256);
+        } else {
+            $this->bitmask = new Math_BigInteger(bcpow('2', $bits, 0));
+        }
+
+        $temp = $this->_normalize($this);
+        $this->value = $temp->value;
+    }
+
+    /**
+     * Logical And
+     *
+     * @param Math_BigInteger $x
+     * @access public
+     * @internal Implemented per a request by Lluis Pamies i Juarez <lluis _a_ pamies.cat>
+     * @return Math_BigInteger
+     */
+    function bitwise_and($x)
+    {
+        switch (MATH_BIGINTEGER_MODE) {
+            case MATH_BIGINTEGER_MODE_GMP:
+                $temp = new Math_BigInteger();
+                $temp->value = gmp_and($this->value, $x->value);
+
+                return $this->_normalize($temp);
+            case MATH_BIGINTEGER_MODE_BCMATH:
+                $left = $this->toBytes();
+                $right = $x->toBytes();
+
+                $length = max(strlen($left), strlen($right));
+
+                $left = str_pad($left, $length, chr(0), STR_PAD_LEFT);
+                $right = str_pad($right, $length, chr(0), STR_PAD_LEFT);
+
+                return $this->_normalize(new Math_BigInteger($left & $right, 256));
+        }
+
+        $result = $this->copy();
+
+        $length = min(count($x->value), count($this->value));
+
+        $result->value = array_slice($result->value, 0, $length);
+
+        for ($i = 0; $i < $length; ++$i) {
+            $result->value[$i]&= $x->value[$i];
+        }
+
+        return $this->_normalize($result);
+    }
+
+    /**
+     * Logical Or
+     *
+     * @param Math_BigInteger $x
+     * @access public
+     * @internal Implemented per a request by Lluis Pamies i Juarez <lluis _a_ pamies.cat>
+     * @return Math_BigInteger
+     */
+    function bitwise_or($x)
+    {
+        switch (MATH_BIGINTEGER_MODE) {
+            case MATH_BIGINTEGER_MODE_GMP:
+                $temp = new Math_BigInteger();
+                $temp->value = gmp_or($this->value, $x->value);
+
+                return $this->_normalize($temp);
+            case MATH_BIGINTEGER_MODE_BCMATH:
+                $left = $this->toBytes();
+                $right = $x->toBytes();
+
+                $length = max(strlen($left), strlen($right));
+
+                $left = str_pad($left, $length, chr(0), STR_PAD_LEFT);
+                $right = str_pad($right, $length, chr(0), STR_PAD_LEFT);
+
+                return $this->_normalize(new Math_BigInteger($left | $right, 256));
+        }
+
+        $length = max(count($this->value), count($x->value));
+        $result = $this->copy();
+        $result->value = array_pad($result->value, $length, 0);
+        $x->value = array_pad($x->value, $length, 0);
+
+        for ($i = 0; $i < $length; ++$i) {
+            $result->value[$i]|= $x->value[$i];
+        }
+
+        return $this->_normalize($result);
+    }
+
+    /**
+     * Logical Exclusive-Or
+     *
+     * @param Math_BigInteger $x
+     * @access public
+     * @internal Implemented per a request by Lluis Pamies i Juarez <lluis _a_ pamies.cat>
+     * @return Math_BigInteger
+     */
+    function bitwise_xor($x)
+    {
+        switch (MATH_BIGINTEGER_MODE) {
+            case MATH_BIGINTEGER_MODE_GMP:
+                $temp = new Math_BigInteger();
+                $temp->value = gmp_xor(gmp_abs($this->value), gmp_abs($x->value));
+
+                return $this->_normalize($temp);
+            case MATH_BIGINTEGER_MODE_BCMATH:
+                $left = $this->toBytes();
+                $right = $x->toBytes();
+
+                $length = max(strlen($left), strlen($right));
+
+                $left = str_pad($left, $length, chr(0), STR_PAD_LEFT);
+                $right = str_pad($right, $length, chr(0), STR_PAD_LEFT);
+
+                return $this->_normalize(new Math_BigInteger($left ^ $right, 256));
+        }
+
+        $length = max(count($this->value), count($x->value));
+        $result = $this->copy();
+        $result->is_negative = false;
+        $result->value = array_pad($result->value, $length, 0);
+        $x->value = array_pad($x->value, $length, 0);
+
+        for ($i = 0; $i < $length; ++$i) {
+            $result->value[$i]^= $x->value[$i];
+        }
+
+        return $this->_normalize($result);
+    }
+
+    /**
+     * Logical Not
+     *
+     * @access public
+     * @internal Implemented per a request by Lluis Pamies i Juarez <lluis _a_ pamies.cat>
+     * @return Math_BigInteger
+     */
+    function bitwise_not()
+    {
+        // calculuate "not" without regard to $this->precision
+        // (will always result in a smaller number.  ie. ~1 isn't 1111 1110 - it's 0)
+        $temp = $this->toBytes();
+        if ($temp == '') {
+            return $this->_normalize(new Math_BigInteger());
+        }
+        $pre_msb = decbin(ord($temp[0]));
+        $temp = ~$temp;
+        $msb = decbin(ord($temp[0]));
+        if (strlen($msb) == 8) {
+            $msb = substr($msb, strpos($msb, '0'));
+        }
+        $temp[0] = chr(bindec($msb));
+
+        // see if we need to add extra leading 1's
+        $current_bits = strlen($pre_msb) + 8 * strlen($temp) - 8;
+        $new_bits = $this->precision - $current_bits;
+        if ($new_bits <= 0) {
+            return $this->_normalize(new Math_BigInteger($temp, 256));
+        }
+
+        // generate as many leading 1's as we need to.
+        $leading_ones = chr((1 << ($new_bits & 0x7)) - 1) . str_repeat(chr(0xFF), $new_bits >> 3);
+        $this->_base256_lshift($leading_ones, $current_bits);
+
+        $temp = str_pad($temp, strlen($leading_ones), chr(0), STR_PAD_LEFT);
+
+        return $this->_normalize(new Math_BigInteger($leading_ones | $temp, 256));
+    }
+
+    /**
+     * Logical Right Shift
+     *
+     * Shifts BigInteger's by $shift bits, effectively dividing by 2**$shift.
+     *
+     * @param int $shift
+     * @return Math_BigInteger
+     * @access public
+     * @internal The only version that yields any speed increases is the internal version.
+     */
+    function bitwise_rightShift($shift)
+    {
+        $temp = new Math_BigInteger();
+
+        switch (MATH_BIGINTEGER_MODE) {
+            case MATH_BIGINTEGER_MODE_GMP:
+                static $two;
+
+                if (!isset($two)) {
+                    $two = gmp_init('2');
+                }
+
+                $temp->value = gmp_div_q($this->value, gmp_pow($two, $shift));
+
+                break;
+            case MATH_BIGINTEGER_MODE_BCMATH:
+                $temp->value = bcdiv($this->value, bcpow('2', $shift, 0), 0);
+
+                break;
+            default: // could just replace _lshift with this, but then all _lshift() calls would need to be rewritten
+                     // and I don't want to do that...
+                $temp->value = $this->value;
+                $temp->_rshift($shift);
+        }
+
+        return $this->_normalize($temp);
+    }
+
+    /**
+     * Logical Left Shift
+     *
+     * Shifts BigInteger's by $shift bits, effectively multiplying by 2**$shift.
+     *
+     * @param int $shift
+     * @return Math_BigInteger
+     * @access public
+     * @internal The only version that yields any speed increases is the internal version.
+     */
+    function bitwise_leftShift($shift)
+    {
+        $temp = new Math_BigInteger();
+
+        switch (MATH_BIGINTEGER_MODE) {
+            case MATH_BIGINTEGER_MODE_GMP:
+                static $two;
+
+                if (!isset($two)) {
+                    $two = gmp_init('2');
+                }
+
+                $temp->value = gmp_mul($this->value, gmp_pow($two, $shift));
+
+                break;
+            case MATH_BIGINTEGER_MODE_BCMATH:
+                $temp->value = bcmul($this->value, bcpow('2', $shift, 0), 0);
+
+                break;
+            default: // could just replace _rshift with this, but then all _lshift() calls would need to be rewritten
+                     // and I don't want to do that...
+                $temp->value = $this->value;
+                $temp->_lshift($shift);
+        }
+
+        return $this->_normalize($temp);
+    }
+
+    /**
+     * Logical Left Rotate
+     *
+     * Instead of the top x bits being dropped they're appended to the shifted bit string.
+     *
+     * @param int $shift
+     * @return Math_BigInteger
+     * @access public
+     */
+    function bitwise_leftRotate($shift)
+    {
+        $bits = $this->toBytes();
+
+        if ($this->precision > 0) {
+            $precision = $this->precision;
+            if (MATH_BIGINTEGER_MODE == MATH_BIGINTEGER_MODE_BCMATH) {
+                $mask = $this->bitmask->subtract(new Math_BigInteger(1));
+                $mask = $mask->toBytes();
+            } else {
+                $mask = $this->bitmask->toBytes();
+            }
+        } else {
+            $temp = ord($bits[0]);
+            for ($i = 0; $temp >> $i; ++$i) {
+            }
+            $precision = 8 * strlen($bits) - 8 + $i;
+            $mask = chr((1 << ($precision & 0x7)) - 1) . str_repeat(chr(0xFF), $precision >> 3);
+        }
+
+        if ($shift < 0) {
+            $shift+= $precision;
+        }
+        $shift%= $precision;
+
+        if (!$shift) {
+            return $this->copy();
+        }
+
+        $left = $this->bitwise_leftShift($shift);
+        $left = $left->bitwise_and(new Math_BigInteger($mask, 256));
+        $right = $this->bitwise_rightShift($precision - $shift);
+        $result = MATH_BIGINTEGER_MODE != MATH_BIGINTEGER_MODE_BCMATH ? $left->bitwise_or($right) : $left->add($right);
+        return $this->_normalize($result);
+    }
+
+    /**
+     * Logical Right Rotate
+     *
+     * Instead of the bottom x bits being dropped they're prepended to the shifted bit string.
+     *
+     * @param int $shift
+     * @return Math_BigInteger
+     * @access public
+     */
+    function bitwise_rightRotate($shift)
+    {
+        return $this->bitwise_leftRotate(-$shift);
+    }
+
+    /**
+     * Set random number generator function
+     *
+     * This function is deprecated.
+     *
+     * @param string $generator
+     * @access public
+     */
+    function setRandomGenerator($generator)
+    {
+    }
+
+    /**
+     * Generates a random BigInteger
+     *
+     * Byte length is equal to $length. Uses crypt_random if it's loaded and mt_rand if it's not.
+     *
+     * @param int $length
+     * @return Math_BigInteger
+     * @access private
+     */
+    function _random_number_helper($size)
+    {
+        if (function_exists('crypt_random_string')) {
+            $random = crypt_random_string($size);
+        } else {
+            $random = '';
+
+            if ($size & 1) {
+                $random.= chr(mt_rand(0, 255));
+            }
+
+            $blocks = $size >> 1;
+            for ($i = 0; $i < $blocks; ++$i) {
+                // mt_rand(-2147483648, 0x7FFFFFFF) always produces -2147483648 on some systems
+                $random.= pack('n', mt_rand(0, 0xFFFF));
+            }
+        }
+
+        return new Math_BigInteger($random, 256);
+    }
+
+    /**
+     * Generate a random number
+     *
+     * Returns a random number between $min and $max where $min and $max
+     * can be defined using one of the two methods:
+     *
+     * $min->random($max)
+     * $max->random($min)
+     *
+     * @param Math_BigInteger $arg1
+     * @param Math_BigInteger $arg2
+     * @return Math_BigInteger
+     * @access public
+     * @internal The API for creating random numbers used to be $a->random($min, $max), where $a was a Math_BigInteger object.
+     *           That method is still supported for BC purposes.
+     */
+    function random($arg1, $arg2 = false)
+    {
+        if ($arg1 === false) {
+            return false;
+        }
+
+        if ($arg2 === false) {
+            $max = $arg1;
+            $min = $this;
+        } else {
+            $min = $arg1;
+            $max = $arg2;
+        }
+
+        $compare = $max->compare($min);
+
+        if (!$compare) {
+            return $this->_normalize($min);
+        } elseif ($compare < 0) {
+            // if $min is bigger then $max, swap $min and $max
+            $temp = $max;
+            $max = $min;
+            $min = $temp;
+        }
+
+        static $one;
+        if (!isset($one)) {
+            $one = new Math_BigInteger(1);
+        }
+
+        $max = $max->subtract($min->subtract($one));
+        $size = strlen(ltrim($max->toBytes(), chr(0)));
+
+        /*
+            doing $random % $max doesn't work because some numbers will be more likely to occur than others.
+            eg. if $max is 140 and $random's max is 255 then that'd mean both $random = 5 and $random = 145
+            would produce 5 whereas the only value of random that could produce 139 would be 139. ie.
+            not all numbers would be equally likely. some would be more likely than others.
+
+            creating a whole new random number until you find one that is within the range doesn't work
+            because, for sufficiently small ranges, the likelihood that you'd get a number within that range
+            would be pretty small. eg. with $random's max being 255 and if your $max being 1 the probability
+            would be pretty high that $random would be greater than $max.
+
+            phpseclib works around this using the technique described here:
+
+            http://crypto.stackexchange.com/questions/5708/creating-a-small-number-from-a-cryptographically-secure-random-string
+        */
+        $random_max = new Math_BigInteger(chr(1) . str_repeat("\0", $size), 256);
+        $random = $this->_random_number_helper($size);
+
+        list($max_multiple) = $random_max->divide($max);
+        $max_multiple = $max_multiple->multiply($max);
+
+        while ($random->compare($max_multiple) >= 0) {
+            $random = $random->subtract($max_multiple);
+            $random_max = $random_max->subtract($max_multiple);
+            $random = $random->bitwise_leftShift(8);
+            $random = $random->add($this->_random_number_helper(1));
+            $random_max = $random_max->bitwise_leftShift(8);
+            list($max_multiple) = $random_max->divide($max);
+            $max_multiple = $max_multiple->multiply($max);
+        }
+        list(, $random) = $random->divide($max);
+
+        return $this->_normalize($random->add($min));
+    }
+
+    /**
+     * Generate a random prime number.
+     *
+     * If there's not a prime within the given range, false will be returned.
+     * If more than $timeout seconds have elapsed, give up and return false.
+     *
+     * @param Math_BigInteger $arg1
+     * @param Math_BigInteger $arg2
+     * @param int $timeout
+     * @return Math_BigInteger|false
+     * @access public
+     * @internal See {@link http://www.cacr.math.uwaterloo.ca/hac/about/chap4.pdf#page=15 HAC 4.44}.
+     */
+    function randomPrime($arg1, $arg2 = false, $timeout = false)
+    {
+        if ($arg1 === false) {
+            return false;
+        }
+
+        if ($arg2 === false) {
+            $max = $arg1;
+            $min = $this;
+        } else {
+            $min = $arg1;
+            $max = $arg2;
+        }
+
+        $compare = $max->compare($min);
+
+        if (!$compare) {
+            return $min->isPrime() ? $min : false;
+        } elseif ($compare < 0) {
+            // if $min is bigger then $max, swap $min and $max
+            $temp = $max;
+            $max = $min;
+            $min = $temp;
+        }
+
+        static $one, $two;
+        if (!isset($one)) {
+            $one = new Math_BigInteger(1);
+            $two = new Math_BigInteger(2);
+        }
+
+        $start = time();
+
+        $x = $this->random($min, $max);
+
+        // gmp_nextprime() requires PHP 5 >= 5.2.0 per <http://php.net/gmp-nextprime>.
+        if (MATH_BIGINTEGER_MODE == MATH_BIGINTEGER_MODE_GMP && extension_loaded('gmp') && version_compare(PHP_VERSION, '5.2.0', '>=')) {
+            $p = new Math_BigInteger();
+            $p->value = gmp_nextprime($x->value);
+
+            if ($p->compare($max) <= 0) {
+                return $p;
+            }
+
+            if (!$min->equals($x)) {
+                $x = $x->subtract($one);
+            }
+
+            return $x->randomPrime($min, $x);
+        }
+
+        if ($x->equals($two)) {
+            return $x;
+        }
+
+        $x->_make_odd();
+        if ($x->compare($max) > 0) {
+            // if $x > $max then $max is even and if $min == $max then no prime number exists between the specified range
+            if ($min->equals($max)) {
+                return false;
+            }
+            $x = $min->copy();
+            $x->_make_odd();
+        }
+
+        $initial_x = $x->copy();
+
+        while (true) {
+            if ($timeout !== false && time() - $start > $timeout) {
+                return false;
+            }
+
+            if ($x->isPrime()) {
+                return $x;
+            }
+
+            $x = $x->add($two);
+
+            if ($x->compare($max) > 0) {
+                $x = $min->copy();
+                if ($x->equals($two)) {
+                    return $x;
+                }
+                $x->_make_odd();
+            }
+
+            if ($x->equals($initial_x)) {
+                return false;
+            }
+        }
+    }
+
+    /**
+     * Make the current number odd
+     *
+     * If the current number is odd it'll be unchanged.  If it's even, one will be added to it.
+     *
+     * @see self::randomPrime()
+     * @access private
+     */
+    function _make_odd()
+    {
+        switch (MATH_BIGINTEGER_MODE) {
+            case MATH_BIGINTEGER_MODE_GMP:
+                gmp_setbit($this->value, 0);
+                break;
+            case MATH_BIGINTEGER_MODE_BCMATH:
+                if ($this->value[strlen($this->value) - 1] % 2 == 0) {
+                    $this->value = bcadd($this->value, '1');
+                }
+                break;
+            default:
+                $this->value[0] |= 1;
+        }
+    }
+
+    /**
+     * Checks a numer to see if it's prime
+     *
+     * Assuming the $t parameter is not set, this function has an error rate of 2**-80.  The main motivation for the
+     * $t parameter is distributability.  Math_BigInteger::randomPrime() can be distributed across multiple pageloads
+     * on a website instead of just one.
+     *
+     * @param Math_BigInteger $t
+     * @return bool
+     * @access public
+     * @internal Uses the
+     *     {@link http://en.wikipedia.org/wiki/Miller%E2%80%93Rabin_primality_test Miller-Rabin primality test}.  See
+     *     {@link http://www.cacr.math.uwaterloo.ca/hac/about/chap4.pdf#page=8 HAC 4.24}.
+     */
+    function isPrime($t = false)
+    {
+        $length = strlen($this->toBytes());
+
+        if (!$t) {
+            // see HAC 4.49 "Note (controlling the error probability)"
+            // @codingStandardsIgnoreStart
+                 if ($length >= 163) { $t =  2; } // floor(1300 / 8)
+            else if ($length >= 106) { $t =  3; } // floor( 850 / 8)
+            else if ($length >= 81 ) { $t =  4; } // floor( 650 / 8)
+            else if ($length >= 68 ) { $t =  5; } // floor( 550 / 8)
+            else if ($length >= 56 ) { $t =  6; } // floor( 450 / 8)
+            else if ($length >= 50 ) { $t =  7; } // floor( 400 / 8)
+            else if ($length >= 43 ) { $t =  8; } // floor( 350 / 8)
+            else if ($length >= 37 ) { $t =  9; } // floor( 300 / 8)
+            else if ($length >= 31 ) { $t = 12; } // floor( 250 / 8)
+            else if ($length >= 25 ) { $t = 15; } // floor( 200 / 8)
+            else if ($length >= 18 ) { $t = 18; } // floor( 150 / 8)
+            else                     { $t = 27; }
+            // @codingStandardsIgnoreEnd
+        }
+
+        // ie. gmp_testbit($this, 0)
+        // ie. isEven() or !isOdd()
+        switch (MATH_BIGINTEGER_MODE) {
+            case MATH_BIGINTEGER_MODE_GMP:
+                return gmp_prob_prime($this->value, $t) != 0;
+            case MATH_BIGINTEGER_MODE_BCMATH:
+                if ($this->value === '2') {
+                    return true;
+                }
+                if ($this->value[strlen($this->value) - 1] % 2 == 0) {
+                    return false;
+                }
+                break;
+            default:
+                if ($this->value == array(2)) {
+                    return true;
+                }
+                if (~$this->value[0] & 1) {
+                    return false;
+                }
+        }
+
+        static $primes, $zero, $one, $two;
+
+        if (!isset($primes)) {
+            $primes = array(
+                3,    5,    7,    11,   13,   17,   19,   23,   29,   31,   37,   41,   43,   47,   53,   59,
+                61,   67,   71,   73,   79,   83,   89,   97,   101,  103,  107,  109,  113,  127,  131,  137,
+                139,  149,  151,  157,  163,  167,  173,  179,  181,  191,  193,  197,  199,  211,  223,  227,
+                229,  233,  239,  241,  251,  257,  263,  269,  271,  277,  281,  283,  293,  307,  311,  313,
+                317,  331,  337,  347,  349,  353,  359,  367,  373,  379,  383,  389,  397,  401,  409,  419,
+                421,  431,  433,  439,  443,  449,  457,  461,  463,  467,  479,  487,  491,  499,  503,  509,
+                521,  523,  541,  547,  557,  563,  569,  571,  577,  587,  593,  599,  601,  607,  613,  617,
+                619,  631,  641,  643,  647,  653,  659,  661,  673,  677,  683,  691,  701,  709,  719,  727,
+                733,  739,  743,  751,  757,  761,  769,  773,  787,  797,  809,  811,  821,  823,  827,  829,
+                839,  853,  857,  859,  863,  877,  881,  883,  887,  907,  911,  919,  929,  937,  941,  947,
+                953,  967,  971,  977,  983,  991,  997
+            );
+
+            if (MATH_BIGINTEGER_MODE != MATH_BIGINTEGER_MODE_INTERNAL) {
+                for ($i = 0; $i < count($primes); ++$i) {
+                    $primes[$i] = new Math_BigInteger($primes[$i]);
+                }
+            }
+
+            $zero = new Math_BigInteger();
+            $one = new Math_BigInteger(1);
+            $two = new Math_BigInteger(2);
+        }
+
+        if ($this->equals($one)) {
+            return false;
+        }
+
+        // see HAC 4.4.1 "Random search for probable primes"
+        if (MATH_BIGINTEGER_MODE != MATH_BIGINTEGER_MODE_INTERNAL) {
+            foreach ($primes as $prime) {
+                list(, $r) = $this->divide($prime);
+                if ($r->equals($zero)) {
+                    return $this->equals($prime);
+                }
+            }
+        } else {
+            $value = $this->value;
+            foreach ($primes as $prime) {
+                list(, $r) = $this->_divide_digit($value, $prime);
+                if (!$r) {
+                    return count($value) == 1 && $value[0] == $prime;
+                }
+            }
+        }
+
+        $n   = $this->copy();
+        $n_1 = $n->subtract($one);
+        $n_2 = $n->subtract($two);
+
+        $r = $n_1->copy();
+        $r_value = $r->value;
+        // ie. $s = gmp_scan1($n, 0) and $r = gmp_div_q($n, gmp_pow(gmp_init('2'), $s));
+        if (MATH_BIGINTEGER_MODE == MATH_BIGINTEGER_MODE_BCMATH) {
+            $s = 0;
+            // if $n was 1, $r would be 0 and this would be an infinite loop, hence our $this->equals($one) check earlier
+            while ($r->value[strlen($r->value) - 1] % 2 == 0) {
+                $r->value = bcdiv($r->value, '2', 0);
+                ++$s;
+            }
+        } else {
+            for ($i = 0, $r_length = count($r_value); $i < $r_length; ++$i) {
+                $temp = ~$r_value[$i] & 0xFFFFFF;
+                for ($j = 1; ($temp >> $j) & 1; ++$j) {
+                }
+                if ($j != 25) {
+                    break;
+                }
+            }
+            $s = 26 * $i + $j;
+            $r->_rshift($s);
+        }
+
+        for ($i = 0; $i < $t; ++$i) {
+            $a = $this->random($two, $n_2);
+            $y = $a->modPow($r, $n);
+
+            if (!$y->equals($one) && !$y->equals($n_1)) {
+                for ($j = 1; $j < $s && !$y->equals($n_1); ++$j) {
+                    $y = $y->modPow($two, $n);
+                    if ($y->equals($one)) {
+                        return false;
+                    }
+                }
+
+                if (!$y->equals($n_1)) {
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+
+    /**
+     * Logical Left Shift
+     *
+     * Shifts BigInteger's by $shift bits.
+     *
+     * @param int $shift
+     * @access private
+     */
+    function _lshift($shift)
+    {
+        if ($shift == 0) {
+            return;
+        }
+
+        $num_digits = (int) ($shift / MATH_BIGINTEGER_BASE);
+        $shift %= MATH_BIGINTEGER_BASE;
+        $shift = 1 << $shift;
+
+        $carry = 0;
+
+        for ($i = 0; $i < count($this->value); ++$i) {
+            $temp = $this->value[$i] * $shift + $carry;
+            $carry = MATH_BIGINTEGER_BASE === 26 ? intval($temp / 0x4000000) : ($temp >> 31);
+            $this->value[$i] = (int) ($temp - $carry * MATH_BIGINTEGER_BASE_FULL);
+        }
+
+        if ($carry) {
+            $this->value[count($this->value)] = $carry;
+        }
+
+        while ($num_digits--) {
+            array_unshift($this->value, 0);
+        }
+    }
+
+    /**
+     * Logical Right Shift
+     *
+     * Shifts BigInteger's by $shift bits.
+     *
+     * @param int $shift
+     * @access private
+     */
+    function _rshift($shift)
+    {
+        if ($shift == 0) {
+            return;
+        }
+
+        $num_digits = (int) ($shift / MATH_BIGINTEGER_BASE);
+        $shift %= MATH_BIGINTEGER_BASE;
+        $carry_shift = MATH_BIGINTEGER_BASE - $shift;
+        $carry_mask = (1 << $shift) - 1;
+
+        if ($num_digits) {
+            $this->value = array_slice($this->value, $num_digits);
+        }
+
+        $carry = 0;
+
+        for ($i = count($this->value) - 1; $i >= 0; --$i) {
+            $temp = $this->value[$i] >> $shift | $carry;
+            $carry = ($this->value[$i] & $carry_mask) << $carry_shift;
+            $this->value[$i] = $temp;
+        }
+
+        $this->value = $this->_trim($this->value);
+    }
+
+    /**
+     * Normalize
+     *
+     * Removes leading zeros and truncates (if necessary) to maintain the appropriate precision
+     *
+     * @param Math_BigInteger
+     * @return Math_BigInteger
+     * @see self::_trim()
+     * @access private
+     */
+    function _normalize($result)
+    {
+        $result->precision = $this->precision;
+        $result->bitmask = $this->bitmask;
+
+        switch (MATH_BIGINTEGER_MODE) {
+            case MATH_BIGINTEGER_MODE_GMP:
+                if ($this->bitmask !== false) {
+                    $result->value = gmp_and($result->value, $result->bitmask->value);
+                }
+
+                return $result;
+            case MATH_BIGINTEGER_MODE_BCMATH:
+                if (!empty($result->bitmask->value)) {
+                    $result->value = bcmod($result->value, $result->bitmask->value);
+                }
+
+                return $result;
+        }
+
+        $value = &$result->value;
+
+        if (!count($value)) {
+            return $result;
+        }
+
+        $value = $this->_trim($value);
+
+        if (!empty($result->bitmask->value)) {
+            $length = min(count($value), count($this->bitmask->value));
+            $value = array_slice($value, 0, $length);
+
+            for ($i = 0; $i < $length; ++$i) {
+                $value[$i] = $value[$i] & $this->bitmask->value[$i];
+            }
+        }
+
+        return $result;
+    }
+
+    /**
+     * Trim
+     *
+     * Removes leading zeros
+     *
+     * @param array $value
+     * @return Math_BigInteger
+     * @access private
+     */
+    function _trim($value)
+    {
+        for ($i = count($value) - 1; $i >= 0; --$i) {
+            if ($value[$i]) {
+                break;
+            }
+            unset($value[$i]);
+        }
+
+        return $value;
+    }
+
+    /**
+     * Array Repeat
+     *
+     * @param $input Array
+     * @param $multiplier mixed
+     * @return array
+     * @access private
+     */
+    function _array_repeat($input, $multiplier)
+    {
+        return ($multiplier) ? array_fill(0, $multiplier, $input) : array();
+    }
+
+    /**
+     * Logical Left Shift
+     *
+     * Shifts binary strings $shift bits, essentially multiplying by 2**$shift.
+     *
+     * @param $x String
+     * @param $shift Integer
+     * @return string
+     * @access private
+     */
+    function _base256_lshift(&$x, $shift)
+    {
+        if ($shift == 0) {
+            return;
+        }
+
+        $num_bytes = $shift >> 3; // eg. floor($shift/8)
+        $shift &= 7; // eg. $shift % 8
+
+        $carry = 0;
+        for ($i = strlen($x) - 1; $i >= 0; --$i) {
+            $temp = ord($x[$i]) << $shift | $carry;
+            $x[$i] = chr($temp);
+            $carry = $temp >> 8;
+        }
+        $carry = ($carry != 0) ? chr($carry) : '';
+        $x = $carry . $x . str_repeat(chr(0), $num_bytes);
+    }
+
+    /**
+     * Logical Right Shift
+     *
+     * Shifts binary strings $shift bits, essentially dividing by 2**$shift and returning the remainder.
+     *
+     * @param $x String
+     * @param $shift Integer
+     * @return string
+     * @access private
+     */
+    function _base256_rshift(&$x, $shift)
+    {
+        if ($shift == 0) {
+            $x = ltrim($x, chr(0));
+            return '';
+        }
+
+        $num_bytes = $shift >> 3; // eg. floor($shift/8)
+        $shift &= 7; // eg. $shift % 8
+
+        $remainder = '';
+        if ($num_bytes) {
+            $start = $num_bytes > strlen($x) ? -strlen($x) : -$num_bytes;
+            $remainder = substr($x, $start);
+            $x = substr($x, 0, -$num_bytes);
+        }
+
+        $carry = 0;
+        $carry_shift = 8 - $shift;
+        for ($i = 0; $i < strlen($x); ++$i) {
+            $temp = (ord($x[$i]) >> $shift) | $carry;
+            $carry = (ord($x[$i]) << $carry_shift) & 0xFF;
+            $x[$i] = chr($temp);
+        }
+        $x = ltrim($x, chr(0));
+
+        $remainder = chr($carry >> $carry_shift) . $remainder;
+
+        return ltrim($remainder, chr(0));
+    }
+
+    // one quirk about how the following functions are implemented is that PHP defines N to be an unsigned long
+    // at 32-bits, while java's longs are 64-bits.
+
+    /**
+     * Converts 32-bit integers to bytes.
+     *
+     * @param int $x
+     * @return string
+     * @access private
+     */
+    function _int2bytes($x)
+    {
+        return ltrim(pack('N', $x), chr(0));
+    }
+
+    /**
+     * Converts bytes to 32-bit integers
+     *
+     * @param string $x
+     * @return int
+     * @access private
+     */
+    function _bytes2int($x)
+    {
+        $temp = unpack('Nint', str_pad($x, 4, chr(0), STR_PAD_LEFT));
+        return $temp['int'];
+    }
+
+    /**
+     * DER-encode an integer
+     *
+     * The ability to DER-encode integers is needed to create RSA public keys for use with OpenSSL
+     *
+     * @see self::modPow()
+     * @access private
+     * @param int $length
+     * @return string
+     */
+    function _encodeASN1Length($length)
+    {
+        if ($length <= 0x7F) {
+            return chr($length);
+        }
+
+        $temp = ltrim(pack('N', $length), chr(0));
+        return pack('Ca*', 0x80 | strlen($temp), $temp);
+    }
+
+    /**
+     * Single digit division
+     *
+     * Even if int64 is being used the division operator will return a float64 value
+     * if the dividend is not evenly divisible by the divisor. Since a float64 doesn't
+     * have the precision of int64 this is a problem so, when int64 is being used,
+     * we'll guarantee that the dividend is divisible by first subtracting the remainder.
+     *
+     * @access private
+     * @param int $x
+     * @param int $y
+     * @return int
+     */
+    function _safe_divide($x, $y)
+    {
+        if (MATH_BIGINTEGER_BASE === 26) {
+            return (int) ($x / $y);
+        }
+
+        // MATH_BIGINTEGER_BASE === 31
+        return ($x - ($x % $y)) / $y;
+    }
+}
diff --git a/lib/php/phpseclib/Net/SCP.php b/lib/php/phpseclib/Net/SCP.php
new file mode 100644
index 00000000..4fb6cbad
--- /dev/null
+++ b/lib/php/phpseclib/Net/SCP.php
@@ -0,0 +1,373 @@
+<?php
+
+/**
+ * Pure-PHP implementation of SCP.
+ *
+ * PHP versions 4 and 5
+ *
+ * The API for this library is modeled after the API from PHP's {@link http://php.net/book.ftp FTP extension}.
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ *    include 'Net/SCP.php';
+ *    include 'Net/SSH2.php';
+ *
+ *    $ssh = new Net_SSH2('www.domain.tld');
+ *    if (!$ssh->login('username', 'password')) {
+ *        exit('bad login');
+ *    }
+ *
+ *    $scp = new Net_SCP($ssh);
+ *    $scp->put('abcd', str_repeat('x', 1024*1024));
+ * ?>
+ * </code>
+ *
+ * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @category  Net
+ * @package   Net_SCP
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2010 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+/**#@+
+ * @access public
+ * @see self::put()
+ */
+/**
+ * Reads data from a local file.
+ */
+define('NET_SCP_LOCAL_FILE', 1);
+/**
+ * Reads data from a string.
+ */
+define('NET_SCP_STRING',  2);
+/**#@-*/
+
+/**#@+
+ * @access private
+ * @see self::_send()
+ * @see self::_receive()
+ */
+/**
+ * SSH1 is being used.
+ */
+define('NET_SCP_SSH1', 1);
+/**
+ * SSH2 is being used.
+ */
+define('NET_SCP_SSH2',  2);
+/**#@-*/
+
+/**
+ * Pure-PHP implementations of SCP.
+ *
+ * @package Net_SCP
+ * @author  Jim Wigginton <terrafrost@php.net>
+ * @access  public
+ */
+class Net_SCP
+{
+    /**
+     * SSH Object
+     *
+     * @var object
+     * @access private
+     */
+    var $ssh;
+
+    /**
+     * Packet Size
+     *
+     * @var int
+     * @access private
+     */
+    var $packet_size;
+
+    /**
+     * Mode
+     *
+     * @var int
+     * @access private
+     */
+    var $mode;
+
+    /**
+     * Default Constructor.
+     *
+     * Connects to an SSH server
+     *
+     * @param Net_SSH1|Net_SSH2 $ssh
+     * @return Net_SCP
+     * @access public
+     */
+    function __construct($ssh)
+    {
+        if (!is_object($ssh)) {
+            return;
+        }
+
+        switch (strtolower(get_class($ssh))) {
+            case 'net_ssh2':
+                $this->mode = NET_SCP_SSH2;
+                break;
+            case 'net_ssh1':
+                $this->packet_size = 50000;
+                $this->mode = NET_SCP_SSH1;
+                break;
+            default:
+                return;
+        }
+
+        $this->ssh = $ssh;
+    }
+
+    /**
+     * PHP4 compatible Default Constructor.
+     *
+     * @see self::__construct()
+     * @param Net_SSH1|Net_SSH2 $ssh
+     * @access public
+     */
+    function Net_SCP($ssh)
+    {
+        $this->__construct($ssh);
+    }
+
+    /**
+     * Uploads a file to the SCP server.
+     *
+     * By default, Net_SCP::put() does not read from the local filesystem.  $data is dumped directly into $remote_file.
+     * So, for example, if you set $data to 'filename.ext' and then do Net_SCP::get(), you will get a file, twelve bytes
+     * long, containing 'filename.ext' as its contents.
+     *
+     * Setting $mode to NET_SCP_LOCAL_FILE will change the above behavior.  With NET_SCP_LOCAL_FILE, $remote_file will
+     * contain as many bytes as filename.ext does on your local filesystem.  If your filename.ext is 1MB then that is how
+     * large $remote_file will be, as well.
+     *
+     * Currently, only binary mode is supported.  As such, if the line endings need to be adjusted, you will need to take
+     * care of that, yourself.
+     *
+     * @param string $remote_file
+     * @param string $data
+     * @param int $mode
+     * @param callable $callback
+     * @return bool
+     * @access public
+     */
+    function put($remote_file, $data, $mode = NET_SCP_STRING, $callback = null)
+    {
+        if (!isset($this->ssh)) {
+            return false;
+        }
+
+        if (!$this->ssh->exec('scp -t ' . escapeshellarg($remote_file), false)) { // -t = to
+            return false;
+        }
+
+        $temp = $this->_receive();
+        if ($temp !== chr(0)) {
+            return false;
+        }
+
+        if ($this->mode == NET_SCP_SSH2) {
+            $this->packet_size = $this->ssh->packet_size_client_to_server[NET_SSH2_CHANNEL_EXEC] - 4;
+        }
+
+        $remote_file = basename($remote_file);
+
+        if ($mode == NET_SCP_STRING) {
+            $size = strlen($data);
+        } else {
+            if (!is_file($data)) {
+                user_error("$data is not a valid file", E_USER_NOTICE);
+                return false;
+            }
+
+            $fp = @fopen($data, 'rb');
+            if (!$fp) {
+                return false;
+            }
+            $size = filesize($data);
+        }
+
+        $this->_send('C0644 ' . $size . ' ' . $remote_file . "\n");
+
+        $temp = $this->_receive();
+        if ($temp !== chr(0)) {
+            return false;
+        }
+
+        $sent = 0;
+        while ($sent < $size) {
+            $temp = $mode & NET_SCP_STRING ? substr($data, $sent, $this->packet_size) : fread($fp, $this->packet_size);
+            $this->_send($temp);
+            $sent+= strlen($temp);
+
+            if (is_callable($callback)) {
+                call_user_func($callback, $sent);
+            }
+        }
+        $this->_close();
+
+        if ($mode != NET_SCP_STRING) {
+            fclose($fp);
+        }
+
+        return true;
+    }
+
+    /**
+     * Downloads a file from the SCP server.
+     *
+     * Returns a string containing the contents of $remote_file if $local_file is left undefined or a boolean false if
+     * the operation was unsuccessful.  If $local_file is defined, returns true or false depending on the success of the
+     * operation
+     *
+     * @param string $remote_file
+     * @param string $local_file
+     * @return mixed
+     * @access public
+     */
+    function get($remote_file, $local_file = false)
+    {
+        if (!isset($this->ssh)) {
+            return false;
+        }
+
+        if (!$this->ssh->exec('scp -f ' . escapeshellarg($remote_file), false)) { // -f = from
+            return false;
+        }
+
+        $this->_send("\0");
+
+        if (!preg_match('#(?<perms>[^ ]+) (?<size>\d+) (?<name>.+)#', rtrim($this->_receive()), $info)) {
+            return false;
+        }
+
+        $this->_send("\0");
+
+        $size = 0;
+
+        if ($local_file !== false) {
+            $fp = @fopen($local_file, 'wb');
+            if (!$fp) {
+                return false;
+            }
+        }
+
+        $content = '';
+        while ($size < $info['size']) {
+            $data = $this->_receive();
+            // SCP usually seems to split stuff out into 16k chunks
+            $size+= strlen($data);
+
+            if ($local_file === false) {
+                $content.= $data;
+            } else {
+                fputs($fp, $data);
+            }
+        }
+
+        $this->_close();
+
+        if ($local_file !== false) {
+            fclose($fp);
+            return true;
+        }
+
+        return $content;
+    }
+
+    /**
+     * Sends a packet to an SSH server
+     *
+     * @param string $data
+     * @access private
+     */
+    function _send($data)
+    {
+        switch ($this->mode) {
+            case NET_SCP_SSH2:
+                $this->ssh->_send_channel_packet(NET_SSH2_CHANNEL_EXEC, $data);
+                break;
+            case NET_SCP_SSH1:
+                $data = pack('CNa*', NET_SSH1_CMSG_STDIN_DATA, strlen($data), $data);
+                $this->ssh->_send_binary_packet($data);
+        }
+    }
+
+    /**
+     * Receives a packet from an SSH server
+     *
+     * @return string
+     * @access private
+     */
+    function _receive()
+    {
+        switch ($this->mode) {
+            case NET_SCP_SSH2:
+                return $this->ssh->_get_channel_packet(NET_SSH2_CHANNEL_EXEC, true);
+            case NET_SCP_SSH1:
+                if (!$this->ssh->bitmap) {
+                    return false;
+                }
+                while (true) {
+                    $response = $this->ssh->_get_binary_packet();
+                    switch ($response[NET_SSH1_RESPONSE_TYPE]) {
+                        case NET_SSH1_SMSG_STDOUT_DATA:
+                            if (strlen($response[NET_SSH1_RESPONSE_DATA]) < 4) {
+                                return false;
+                            }
+                            extract(unpack('Nlength', $response[NET_SSH1_RESPONSE_DATA]));
+                            return $this->ssh->_string_shift($response[NET_SSH1_RESPONSE_DATA], $length);
+                        case NET_SSH1_SMSG_STDERR_DATA:
+                            break;
+                        case NET_SSH1_SMSG_EXITSTATUS:
+                            $this->ssh->_send_binary_packet(chr(NET_SSH1_CMSG_EXIT_CONFIRMATION));
+                            fclose($this->ssh->fsock);
+                            $this->ssh->bitmap = 0;
+                            return false;
+                        default:
+                            user_error('Unknown packet received', E_USER_NOTICE);
+                            return false;
+                    }
+                }
+        }
+    }
+
+    /**
+     * Closes the connection to an SSH server
+     *
+     * @access private
+     */
+    function _close()
+    {
+        switch ($this->mode) {
+            case NET_SCP_SSH2:
+                $this->ssh->_close_channel(NET_SSH2_CHANNEL_EXEC, true);
+                break;
+            case NET_SCP_SSH1:
+                $this->ssh->disconnect();
+        }
+    }
+}
diff --git a/lib/php/phpseclib/Net/SFTP.php b/lib/php/phpseclib/Net/SFTP.php
new file mode 100644
index 00000000..5e77c3c3
--- /dev/null
+++ b/lib/php/phpseclib/Net/SFTP.php
@@ -0,0 +1,3171 @@
+<?php
+
+/**
+ * Pure-PHP implementation of SFTP.
+ *
+ * PHP versions 4 and 5
+ *
+ * Currently only supports SFTPv2 and v3, which, according to wikipedia.org, "is the most widely used version,
+ * implemented by the popular OpenSSH SFTP server".  If you want SFTPv4/5/6 support, provide me with access
+ * to an SFTPv4/5/6 server.
+ *
+ * The API for this library is modeled after the API from PHP's {@link http://php.net/book.ftp FTP extension}.
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ *    include 'Net/SFTP.php';
+ *
+ *    $sftp = new Net_SFTP('www.domain.tld');
+ *    if (!$sftp->login('username', 'password')) {
+ *        exit('Login Failed');
+ *    }
+ *
+ *    echo $sftp->pwd() . "\r\n";
+ *    $sftp->put('filename.ext', 'hello, world!');
+ *    print_r($sftp->nlist());
+ * ?>
+ * </code>
+ *
+ * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @category  Net
+ * @package   Net_SFTP
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2009 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+/**
+ * Include Net_SSH2
+ */
+if (!class_exists('Net_SSH2')) {
+    include_once 'SSH2.php';
+}
+
+/**#@+
+ * @access public
+ * @see self::getLog()
+ */
+/**
+ * Returns the message numbers
+ */
+define('NET_SFTP_LOG_SIMPLE',  NET_SSH2_LOG_SIMPLE);
+/**
+ * Returns the message content
+ */
+define('NET_SFTP_LOG_COMPLEX', NET_SSH2_LOG_COMPLEX);
+/**
+ * Outputs the message content in real-time.
+ */
+define('NET_SFTP_LOG_REALTIME', 3);
+/**#@-*/
+
+/**
+ * SFTP channel constant
+ *
+ * Net_SSH2::exec() uses 0 and Net_SSH2::read() / Net_SSH2::write() use 1.
+ *
+ * @see Net_SSH2::_send_channel_packet()
+ * @see Net_SSH2::_get_channel_packet()
+ * @access private
+ */
+define('NET_SFTP_CHANNEL', 0x100);
+
+/**#@+
+ * @access public
+ * @see self::put()
+ */
+/**
+ * Reads data from a local file.
+ */
+define('NET_SFTP_LOCAL_FILE',    1);
+/**
+ * Reads data from a string.
+ */
+// this value isn't really used anymore but i'm keeping it reserved for historical reasons
+define('NET_SFTP_STRING',        2);
+/**
+ * Reads data from callback:
+ * function callback($length) returns string to proceed, null for EOF
+ */
+define('NET_SFTP_CALLBACK',     16);
+/**
+ * Resumes an upload
+ */
+define('NET_SFTP_RESUME',        4);
+/**
+ * Append a local file to an already existing remote file
+ */
+define('NET_SFTP_RESUME_START',  8);
+/**#@-*/
+
+/**
+ * Pure-PHP implementations of SFTP.
+ *
+ * @package Net_SFTP
+ * @author  Jim Wigginton <terrafrost@php.net>
+ * @access  public
+ */
+class Net_SFTP extends Net_SSH2
+{
+    /**
+     * Packet Types
+     *
+     * @see self::Net_SFTP()
+     * @var array
+     * @access private
+     */
+    var $packet_types = array();
+
+    /**
+     * Status Codes
+     *
+     * @see self::Net_SFTP()
+     * @var array
+     * @access private
+     */
+    var $status_codes = array();
+
+    /**
+     * The Request ID
+     *
+     * The request ID exists in the off chance that a packet is sent out-of-order.  Of course, this library doesn't support
+     * concurrent actions, so it's somewhat academic, here.
+     *
+     * @var int
+     * @see self::_send_sftp_packet()
+     * @access private
+     */
+    var $request_id = false;
+
+    /**
+     * The Packet Type
+     *
+     * The request ID exists in the off chance that a packet is sent out-of-order.  Of course, this library doesn't support
+     * concurrent actions, so it's somewhat academic, here.
+     *
+     * @var int
+     * @see self::_get_sftp_packet()
+     * @access private
+     */
+    var $packet_type = -1;
+
+    /**
+     * Packet Buffer
+     *
+     * @var string
+     * @see self::_get_sftp_packet()
+     * @access private
+     */
+    var $packet_buffer = '';
+
+    /**
+     * Extensions supported by the server
+     *
+     * @var array
+     * @see self::_initChannel()
+     * @access private
+     */
+    var $extensions = array();
+
+    /**
+     * Server SFTP version
+     *
+     * @var int
+     * @see self::_initChannel()
+     * @access private
+     */
+    var $version;
+
+    /**
+     * Current working directory
+     *
+     * @var string
+     * @see self::realpath()
+     * @see self::chdir()
+     * @access private
+     */
+    var $pwd = false;
+
+    /**
+     * Packet Type Log
+     *
+     * @see self::getLog()
+     * @var array
+     * @access private
+     */
+    var $packet_type_log = array();
+
+    /**
+     * Packet Log
+     *
+     * @see self::getLog()
+     * @var array
+     * @access private
+     */
+    var $packet_log = array();
+
+    /**
+     * Error information
+     *
+     * @see self::getSFTPErrors()
+     * @see self::getLastSFTPError()
+     * @var array
+     * @access private
+     */
+    var $sftp_errors = array();
+
+    /**
+     * Stat Cache
+     *
+     * Rather than always having to open a directory and close it immediately there after to see if a file is a directory
+     * we'll cache the results.
+     *
+     * @see self::_update_stat_cache()
+     * @see self::_remove_from_stat_cache()
+     * @see self::_query_stat_cache()
+     * @var array
+     * @access private
+     */
+    var $stat_cache = array();
+
+    /**
+     * Max SFTP Packet Size
+     *
+     * @see self::Net_SFTP()
+     * @see self::get()
+     * @var array
+     * @access private
+     */
+    var $max_sftp_packet;
+
+    /**
+     * Stat Cache Flag
+     *
+     * @see self::disableStatCache()
+     * @see self::enableStatCache()
+     * @var bool
+     * @access private
+     */
+    var $use_stat_cache = true;
+
+    /**
+     * Sort Options
+     *
+     * @see self::_comparator()
+     * @see self::setListOrder()
+     * @var array
+     * @access private
+     */
+    var $sortOptions = array();
+
+    /**
+     * Canonicalization Flag
+     *
+     * Determines whether or not paths should be canonicalized before being
+     * passed on to the remote server.
+     *
+     * @see self::enablePathCanonicalization()
+     * @see self::disablePathCanonicalization()
+     * @see self::realpath()
+     * @var bool
+     * @access private
+     */
+    var $canonicalize_paths = true;
+
+    /**
+     * Default Constructor.
+     *
+     * Connects to an SFTP server
+     *
+     * @param string $host
+     * @param int $port
+     * @param int $timeout
+     * @return Net_SFTP
+     * @access public
+     */
+    function __construct($host, $port = 22, $timeout = 10)
+    {
+        parent::__construct($host, $port, $timeout);
+
+        $this->max_sftp_packet = 1 << 15;
+
+        $this->packet_types = array(
+            1  => 'NET_SFTP_INIT',
+            2  => 'NET_SFTP_VERSION',
+            /* the format of SSH_FXP_OPEN changed between SFTPv4 and SFTPv5+:
+                   SFTPv5+: http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-8.1.1
+               pre-SFTPv5 : http://tools.ietf.org/html/draft-ietf-secsh-filexfer-04#section-6.3 */
+            3  => 'NET_SFTP_OPEN',
+            4  => 'NET_SFTP_CLOSE',
+            5  => 'NET_SFTP_READ',
+            6  => 'NET_SFTP_WRITE',
+            7  => 'NET_SFTP_LSTAT',
+            9  => 'NET_SFTP_SETSTAT',
+            11 => 'NET_SFTP_OPENDIR',
+            12 => 'NET_SFTP_READDIR',
+            13 => 'NET_SFTP_REMOVE',
+            14 => 'NET_SFTP_MKDIR',
+            15 => 'NET_SFTP_RMDIR',
+            16 => 'NET_SFTP_REALPATH',
+            17 => 'NET_SFTP_STAT',
+            /* the format of SSH_FXP_RENAME changed between SFTPv4 and SFTPv5+:
+                   SFTPv5+: http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-8.3
+               pre-SFTPv5 : http://tools.ietf.org/html/draft-ietf-secsh-filexfer-04#section-6.5 */
+            18 => 'NET_SFTP_RENAME',
+            19 => 'NET_SFTP_READLINK',
+            20 => 'NET_SFTP_SYMLINK',
+
+            101=> 'NET_SFTP_STATUS',
+            102=> 'NET_SFTP_HANDLE',
+            /* the format of SSH_FXP_NAME changed between SFTPv3 and SFTPv4+:
+                   SFTPv4+: http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-9.4
+               pre-SFTPv4 : http://tools.ietf.org/html/draft-ietf-secsh-filexfer-02#section-7 */
+            103=> 'NET_SFTP_DATA',
+            104=> 'NET_SFTP_NAME',
+            105=> 'NET_SFTP_ATTRS',
+
+            200=> 'NET_SFTP_EXTENDED'
+        );
+        $this->status_codes = array(
+            0 => 'NET_SFTP_STATUS_OK',
+            1 => 'NET_SFTP_STATUS_EOF',
+            2 => 'NET_SFTP_STATUS_NO_SUCH_FILE',
+            3 => 'NET_SFTP_STATUS_PERMISSION_DENIED',
+            4 => 'NET_SFTP_STATUS_FAILURE',
+            5 => 'NET_SFTP_STATUS_BAD_MESSAGE',
+            6 => 'NET_SFTP_STATUS_NO_CONNECTION',
+            7 => 'NET_SFTP_STATUS_CONNECTION_LOST',
+            8 => 'NET_SFTP_STATUS_OP_UNSUPPORTED',
+            9 => 'NET_SFTP_STATUS_INVALID_HANDLE',
+            10 => 'NET_SFTP_STATUS_NO_SUCH_PATH',
+            11 => 'NET_SFTP_STATUS_FILE_ALREADY_EXISTS',
+            12 => 'NET_SFTP_STATUS_WRITE_PROTECT',
+            13 => 'NET_SFTP_STATUS_NO_MEDIA',
+            14 => 'NET_SFTP_STATUS_NO_SPACE_ON_FILESYSTEM',
+            15 => 'NET_SFTP_STATUS_QUOTA_EXCEEDED',
+            16 => 'NET_SFTP_STATUS_UNKNOWN_PRINCIPAL',
+            17 => 'NET_SFTP_STATUS_LOCK_CONFLICT',
+            18 => 'NET_SFTP_STATUS_DIR_NOT_EMPTY',
+            19 => 'NET_SFTP_STATUS_NOT_A_DIRECTORY',
+            20 => 'NET_SFTP_STATUS_INVALID_FILENAME',
+            21 => 'NET_SFTP_STATUS_LINK_LOOP',
+            22 => 'NET_SFTP_STATUS_CANNOT_DELETE',
+            23 => 'NET_SFTP_STATUS_INVALID_PARAMETER',
+            24 => 'NET_SFTP_STATUS_FILE_IS_A_DIRECTORY',
+            25 => 'NET_SFTP_STATUS_BYTE_RANGE_LOCK_CONFLICT',
+            26 => 'NET_SFTP_STATUS_BYTE_RANGE_LOCK_REFUSED',
+            27 => 'NET_SFTP_STATUS_DELETE_PENDING',
+            28 => 'NET_SFTP_STATUS_FILE_CORRUPT',
+            29 => 'NET_SFTP_STATUS_OWNER_INVALID',
+            30 => 'NET_SFTP_STATUS_GROUP_INVALID',
+            31 => 'NET_SFTP_STATUS_NO_MATCHING_BYTE_RANGE_LOCK'
+        );
+        // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-7.1
+        // the order, in this case, matters quite a lot - see Net_SFTP::_parseAttributes() to understand why
+        $this->attributes = array(
+            0x00000001 => 'NET_SFTP_ATTR_SIZE',
+            0x00000002 => 'NET_SFTP_ATTR_UIDGID', // defined in SFTPv3, removed in SFTPv4+
+            0x00000004 => 'NET_SFTP_ATTR_PERMISSIONS',
+            0x00000008 => 'NET_SFTP_ATTR_ACCESSTIME',
+            // 0x80000000 will yield a floating point on 32-bit systems and converting floating points to integers
+            // yields inconsistent behavior depending on how php is compiled.  so we left shift -1 (which, in
+            // two's compliment, consists of all 1 bits) by 31.  on 64-bit systems this'll yield 0xFFFFFFFF80000000.
+            // that's not a problem, however, and 'anded' and a 32-bit number, as all the leading 1 bits are ignored.
+            (-1 << 31) & 0xFFFFFFFF => 'NET_SFTP_ATTR_EXTENDED'
+        );
+        // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-04#section-6.3
+        // the flag definitions change somewhat in SFTPv5+.  if SFTPv5+ support is added to this library, maybe name
+        // the array for that $this->open5_flags and similarly alter the constant names.
+        $this->open_flags = array(
+            0x00000001 => 'NET_SFTP_OPEN_READ',
+            0x00000002 => 'NET_SFTP_OPEN_WRITE',
+            0x00000004 => 'NET_SFTP_OPEN_APPEND',
+            0x00000008 => 'NET_SFTP_OPEN_CREATE',
+            0x00000010 => 'NET_SFTP_OPEN_TRUNCATE',
+            0x00000020 => 'NET_SFTP_OPEN_EXCL'
+        );
+        // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-04#section-5.2
+        // see Net_SFTP::_parseLongname() for an explanation
+        $this->file_types = array(
+            1 => 'NET_SFTP_TYPE_REGULAR',
+            2 => 'NET_SFTP_TYPE_DIRECTORY',
+            3 => 'NET_SFTP_TYPE_SYMLINK',
+            4 => 'NET_SFTP_TYPE_SPECIAL',
+            5 => 'NET_SFTP_TYPE_UNKNOWN',
+            // the followin types were first defined for use in SFTPv5+
+            // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-05#section-5.2
+            6 => 'NET_SFTP_TYPE_SOCKET',
+            7 => 'NET_SFTP_TYPE_CHAR_DEVICE',
+            8 => 'NET_SFTP_TYPE_BLOCK_DEVICE',
+            9 => 'NET_SFTP_TYPE_FIFO'
+        );
+        $this->_define_array(
+            $this->packet_types,
+            $this->status_codes,
+            $this->attributes,
+            $this->open_flags,
+            $this->file_types
+        );
+
+        if (!defined('NET_SFTP_QUEUE_SIZE')) {
+            define('NET_SFTP_QUEUE_SIZE', 32);
+        }
+    }
+
+    /**
+     * PHP4 compatible Default Constructor.
+     *
+     * @see self::__construct()
+     * @param string $host
+     * @param int $port
+     * @param int $timeout
+     * @access public
+     */
+    function Net_SFTP($host, $port = 22, $timeout = 10)
+    {
+        $this->__construct($host, $port, $timeout);
+    }
+
+    /**
+     * Login
+     *
+     * @param string $username
+     * @param string $password
+     * @return bool
+     * @access public
+     */
+    function login($username)
+    {
+        $args = func_get_args();
+        if (!call_user_func_array(array(&$this, '_login'), $args)) {
+            return false;
+        }
+
+        $this->window_size_server_to_client[NET_SFTP_CHANNEL] = $this->window_size;
+
+        $packet = pack(
+            'CNa*N3',
+            NET_SSH2_MSG_CHANNEL_OPEN,
+            strlen('session'),
+            'session',
+            NET_SFTP_CHANNEL,
+            $this->window_size,
+            0x4000
+        );
+
+        if (!$this->_send_binary_packet($packet)) {
+            return false;
+        }
+
+        $this->channel_status[NET_SFTP_CHANNEL] = NET_SSH2_MSG_CHANNEL_OPEN;
+
+        $response = $this->_get_channel_packet(NET_SFTP_CHANNEL, true);
+        if ($response === false) {
+            return false;
+        }
+
+        $packet = pack(
+            'CNNa*CNa*',
+            NET_SSH2_MSG_CHANNEL_REQUEST,
+            $this->server_channels[NET_SFTP_CHANNEL],
+            strlen('subsystem'),
+            'subsystem',
+            1,
+            strlen('sftp'),
+            'sftp'
+        );
+        if (!$this->_send_binary_packet($packet)) {
+            return false;
+        }
+
+        $this->channel_status[NET_SFTP_CHANNEL] = NET_SSH2_MSG_CHANNEL_REQUEST;
+
+        $response = $this->_get_channel_packet(NET_SFTP_CHANNEL, true);
+        if ($response === false) {
+            // from PuTTY's psftp.exe
+            $command = "test -x /usr/lib/sftp-server && exec /usr/lib/sftp-server\n" .
+                       "test -x /usr/local/lib/sftp-server && exec /usr/local/lib/sftp-server\n" .
+                       "exec sftp-server";
+            // we don't do $this->exec($command, false) because exec() operates on a different channel and plus the SSH_MSG_CHANNEL_OPEN that exec() does
+            // is redundant
+            $packet = pack(
+                'CNNa*CNa*',
+                NET_SSH2_MSG_CHANNEL_REQUEST,
+                $this->server_channels[NET_SFTP_CHANNEL],
+                strlen('exec'),
+                'exec',
+                1,
+                strlen($command),
+                $command
+            );
+            if (!$this->_send_binary_packet($packet)) {
+                return false;
+            }
+
+            $this->channel_status[NET_SFTP_CHANNEL] = NET_SSH2_MSG_CHANNEL_REQUEST;
+
+            $response = $this->_get_channel_packet(NET_SFTP_CHANNEL, true);
+            if ($response === false) {
+                return false;
+            }
+        }
+
+        $this->channel_status[NET_SFTP_CHANNEL] = NET_SSH2_MSG_CHANNEL_DATA;
+
+        if (!$this->_send_sftp_packet(NET_SFTP_INIT, "\0\0\0\3")) {
+            return false;
+        }
+
+        $response = $this->_get_sftp_packet();
+        if ($this->packet_type != NET_SFTP_VERSION) {
+            user_error('Expected SSH_FXP_VERSION');
+            return false;
+        }
+
+        if (strlen($response) < 4) {
+            return false;
+        }
+        extract(unpack('Nversion', $this->_string_shift($response, 4)));
+        $this->version = $version;
+        while (!empty($response)) {
+            if (strlen($response) < 4) {
+                return false;
+            }
+            extract(unpack('Nlength', $this->_string_shift($response, 4)));
+            $key = $this->_string_shift($response, $length);
+            if (strlen($response) < 4) {
+                return false;
+            }
+            extract(unpack('Nlength', $this->_string_shift($response, 4)));
+            $value = $this->_string_shift($response, $length);
+            $this->extensions[$key] = $value;
+        }
+
+        /*
+         SFTPv4+ defines a 'newline' extension.  SFTPv3 seems to have unofficial support for it via 'newline@vandyke.com',
+         however, I'm not sure what 'newline@vandyke.com' is supposed to do (the fact that it's unofficial means that it's
+         not in the official SFTPv3 specs) and 'newline@vandyke.com' / 'newline' are likely not drop-in substitutes for
+         one another due to the fact that 'newline' comes with a SSH_FXF_TEXT bitmask whereas it seems unlikely that
+         'newline@vandyke.com' would.
+        */
+        /*
+        if (isset($this->extensions['newline@vandyke.com'])) {
+            $this->extensions['newline'] = $this->extensions['newline@vandyke.com'];
+            unset($this->extensions['newline@vandyke.com']);
+        }
+        */
+
+        $this->request_id = 1;
+
+        /*
+         A Note on SFTPv4/5/6 support:
+         <http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-5.1> states the following:
+
+         "If the client wishes to interoperate with servers that support noncontiguous version
+          numbers it SHOULD send '3'"
+
+         Given that the server only sends its version number after the client has already done so, the above
+         seems to be suggesting that v3 should be the default version.  This makes sense given that v3 is the
+         most popular.
+
+         <http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-5.5> states the following;
+
+         "If the server did not send the "versions" extension, or the version-from-list was not included, the
+          server MAY send a status response describing the failure, but MUST then close the channel without
+          processing any further requests."
+
+         So what do you do if you have a client whose initial SSH_FXP_INIT packet says it implements v3 and
+         a server whose initial SSH_FXP_VERSION reply says it implements v4 and only v4?  If it only implements
+         v4, the "versions" extension is likely not going to have been sent so version re-negotiation as discussed
+         in draft-ietf-secsh-filexfer-13 would be quite impossible.  As such, what Net_SFTP would do is close the
+         channel and reopen it with a new and updated SSH_FXP_INIT packet.
+        */
+        switch ($this->version) {
+            case 2:
+            case 3:
+                break;
+            default:
+                return false;
+        }
+
+        $this->pwd = $this->_realpath('.');
+
+        $this->_update_stat_cache($this->pwd, array());
+
+        return true;
+    }
+
+    /**
+     * Disable the stat cache
+     *
+     * @access public
+     */
+    function disableStatCache()
+    {
+        $this->use_stat_cache = false;
+    }
+
+    /**
+     * Enable the stat cache
+     *
+     * @access public
+     */
+    function enableStatCache()
+    {
+        $this->use_stat_cache = true;
+    }
+
+    /**
+     * Clear the stat cache
+     *
+     * @access public
+     */
+    function clearStatCache()
+    {
+        $this->stat_cache = array();
+    }
+
+    /**
+     * Enable path canonicalization
+     *
+     * @access public
+     */
+    function enablePathCanonicalization()
+    {
+        $this->canonicalize_paths = true;
+    }
+
+    /**
+     * Enable path canonicalization
+     *
+     * @access public
+     */
+    function disablePathCanonicalization()
+    {
+        $this->canonicalize_paths = false;
+    }
+
+    /**
+     * Returns the current directory name
+     *
+     * @return mixed
+     * @access public
+     */
+    function pwd()
+    {
+        return $this->pwd;
+    }
+
+    /**
+     * Logs errors
+     *
+     * @param string $response
+     * @param int $status
+     * @access public
+     */
+    function _logError($response, $status = -1)
+    {
+        if ($status == -1) {
+            if (strlen($response) < 4) {
+                return;
+            }
+            extract(unpack('Nstatus', $this->_string_shift($response, 4)));
+        }
+
+        $error = $this->status_codes[$status];
+
+        if ($this->version > 2 || strlen($response) < 4) {
+            extract(unpack('Nlength', $this->_string_shift($response, 4)));
+            $this->sftp_errors[] = $error . ': ' . $this->_string_shift($response, $length);
+        } else {
+            $this->sftp_errors[] = $error;
+        }
+    }
+
+    /**
+     * Returns canonicalized absolute pathname
+     *
+     * realpath() expands all symbolic links and resolves references to '/./', '/../' and extra '/' characters in the input
+     * path and returns the canonicalized absolute pathname.
+     *
+     * @param string $path
+     * @return mixed
+     * @access public
+     */
+    function realpath($path)
+    {
+        return $this->_realpath($path);
+    }
+
+    /**
+     * Canonicalize the Server-Side Path Name
+     *
+     * SFTP doesn't provide a mechanism by which the current working directory can be changed, so we'll emulate it.  Returns
+     * the absolute (canonicalized) path.
+     *
+     * If canonicalize_paths has been disabled using disablePathCanonicalization(), $path is returned as-is.
+     *
+     * @see self::chdir()
+     * @see self::disablePathCanonicalization()
+     * @param string $path
+     * @return mixed
+     * @access private
+     */
+    function _realpath($path)
+    {
+        if (!$this->canonicalize_paths) {
+            return $path;
+        }
+
+        if ($this->pwd === false) {
+            // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-8.9
+            if (!$this->_send_sftp_packet(NET_SFTP_REALPATH, pack('Na*', strlen($path), $path))) {
+                return false;
+            }
+
+            $response = $this->_get_sftp_packet();
+            switch ($this->packet_type) {
+                case NET_SFTP_NAME:
+                    // although SSH_FXP_NAME is implemented differently in SFTPv3 than it is in SFTPv4+, the following
+                    // should work on all SFTP versions since the only part of the SSH_FXP_NAME packet the following looks
+                    // at is the first part and that part is defined the same in SFTP versions 3 through 6.
+                    $this->_string_shift($response, 4); // skip over the count - it should be 1, anyway
+                    if (strlen($response) < 4) {
+                        return false;
+                    }
+                    extract(unpack('Nlength', $this->_string_shift($response, 4)));
+                    return $this->_string_shift($response, $length);
+                case NET_SFTP_STATUS:
+                    $this->_logError($response);
+                    return false;
+                default:
+                    user_error('Expected SSH_FXP_NAME or SSH_FXP_STATUS');
+                    return false;
+            }
+        }
+
+        if ($path[0] != '/') {
+            $path = $this->pwd . '/' . $path;
+        }
+
+        $path = explode('/', $path);
+        $new = array();
+        foreach ($path as $dir) {
+            if (!strlen($dir)) {
+                continue;
+            }
+            switch ($dir) {
+                case '..':
+                    array_pop($new);
+                case '.':
+                    break;
+                default:
+                    $new[] = $dir;
+            }
+        }
+
+        return '/' . implode('/', $new);
+    }
+
+    /**
+     * Changes the current directory
+     *
+     * @param string $dir
+     * @return bool
+     * @access public
+     */
+    function chdir($dir)
+    {
+        if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
+            return false;
+        }
+
+        // assume current dir if $dir is empty
+        if ($dir === '') {
+            $dir = './';
+        // suffix a slash if needed
+        } elseif ($dir[strlen($dir) - 1] != '/') {
+            $dir.= '/';
+        }
+
+        $dir = $this->_realpath($dir);
+
+        // confirm that $dir is, in fact, a valid directory
+        if ($this->use_stat_cache && is_array($this->_query_stat_cache($dir))) {
+            $this->pwd = $dir;
+            return true;
+        }
+
+        // we could do a stat on the alleged $dir to see if it's a directory but that doesn't tell us
+        // the currently logged in user has the appropriate permissions or not. maybe you could see if
+        // the file's uid / gid match the currently logged in user's uid / gid but how there's no easy
+        // way to get those with SFTP
+
+        if (!$this->_send_sftp_packet(NET_SFTP_OPENDIR, pack('Na*', strlen($dir), $dir))) {
+            return false;
+        }
+
+        // see Net_SFTP::nlist() for a more thorough explanation of the following
+        $response = $this->_get_sftp_packet();
+        switch ($this->packet_type) {
+            case NET_SFTP_HANDLE:
+                $handle = substr($response, 4);
+                break;
+            case NET_SFTP_STATUS:
+                $this->_logError($response);
+                return false;
+            default:
+                user_error('Expected SSH_FXP_HANDLE or SSH_FXP_STATUS');
+                return false;
+        }
+
+        if (!$this->_close_handle($handle)) {
+            return false;
+        }
+
+        $this->_update_stat_cache($dir, array());
+
+        $this->pwd = $dir;
+        return true;
+    }
+
+    /**
+     * Returns a list of files in the given directory
+     *
+     * @param string $dir
+     * @param bool $recursive
+     * @return mixed
+     * @access public
+     */
+    function nlist($dir = '.', $recursive = false)
+    {
+        return $this->_nlist_helper($dir, $recursive, '');
+    }
+
+    /**
+     * Helper method for nlist
+     *
+     * @param string $dir
+     * @param bool $recursive
+     * @param string $relativeDir
+     * @return mixed
+     * @access private
+     */
+    function _nlist_helper($dir, $recursive, $relativeDir)
+    {
+        $files = $this->_list($dir, false);
+
+        if (!$recursive || $files === false) {
+            return $files;
+        }
+
+        $result = array();
+        foreach ($files as $value) {
+            if ($value == '.' || $value == '..') {
+                if ($relativeDir == '') {
+                    $result[] = $value;
+                }
+                continue;
+            }
+            if (is_array($this->_query_stat_cache($this->_realpath($dir . '/' . $value)))) {
+                $temp = $this->_nlist_helper($dir . '/' . $value, true, $relativeDir . $value . '/');
+                $result = array_merge($result, $temp);
+            } else {
+                $result[] = $relativeDir . $value;
+            }
+        }
+
+        return $result;
+    }
+
+    /**
+     * Returns a detailed list of files in the given directory
+     *
+     * @param string $dir
+     * @param bool $recursive
+     * @return mixed
+     * @access public
+     */
+    function rawlist($dir = '.', $recursive = false)
+    {
+        $files = $this->_list($dir, true);
+        if (!$recursive || $files === false) {
+            return $files;
+        }
+
+        static $depth = 0;
+
+        foreach ($files as $key => $value) {
+            if ($depth != 0 && $key == '..') {
+                unset($files[$key]);
+                continue;
+            }
+            $is_directory = false;
+            if ($key != '.' && $key != '..') {
+                if ($this->use_stat_cache) {
+                    $is_directory = is_array($this->_query_stat_cache($this->_realpath($dir . '/' . $key)));
+                } else {
+                    $stat = $this->lstat($dir . '/' . $key);
+                    $is_directory = $stat && $stat['type'] === NET_SFTP_TYPE_DIRECTORY;
+                }
+            }
+
+            if ($is_directory) {
+                $depth++;
+                $files[$key] = $this->rawlist($dir . '/' . $key, true);
+                $depth--;
+            } else {
+                $files[$key] = (object) $value;
+            }
+        }
+
+        return $files;
+    }
+
+    /**
+     * Reads a list, be it detailed or not, of files in the given directory
+     *
+     * @param string $dir
+     * @param bool $raw
+     * @return mixed
+     * @access private
+     */
+    function _list($dir, $raw = true)
+    {
+        if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
+            return false;
+        }
+
+        $dir = $this->_realpath($dir . '/');
+        if ($dir === false) {
+            return false;
+        }
+
+        // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-8.1.2
+        if (!$this->_send_sftp_packet(NET_SFTP_OPENDIR, pack('Na*', strlen($dir), $dir))) {
+            return false;
+        }
+
+        $response = $this->_get_sftp_packet();
+        switch ($this->packet_type) {
+            case NET_SFTP_HANDLE:
+                // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-9.2
+                // since 'handle' is the last field in the SSH_FXP_HANDLE packet, we'll just remove the first four bytes that
+                // represent the length of the string and leave it at that
+                $handle = substr($response, 4);
+                break;
+            case NET_SFTP_STATUS:
+                // presumably SSH_FX_NO_SUCH_FILE or SSH_FX_PERMISSION_DENIED
+                $this->_logError($response);
+                return false;
+            default:
+                user_error('Expected SSH_FXP_HANDLE or SSH_FXP_STATUS');
+                return false;
+        }
+
+        $this->_update_stat_cache($dir, array());
+
+        $contents = array();
+        while (true) {
+            // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-8.2.2
+            // why multiple SSH_FXP_READDIR packets would be sent when the response to a single one can span arbitrarily many
+            // SSH_MSG_CHANNEL_DATA messages is not known to me.
+            if (!$this->_send_sftp_packet(NET_SFTP_READDIR, pack('Na*', strlen($handle), $handle))) {
+                return false;
+            }
+
+            $response = $this->_get_sftp_packet();
+            switch ($this->packet_type) {
+                case NET_SFTP_NAME:
+                    if (strlen($response) < 4) {
+                        return false;
+                    }
+                    extract(unpack('Ncount', $this->_string_shift($response, 4)));
+                    for ($i = 0; $i < $count; $i++) {
+                        if (strlen($response) < 4) {
+                            return false;
+                        }
+                        extract(unpack('Nlength', $this->_string_shift($response, 4)));
+                        $shortname = $this->_string_shift($response, $length);
+                        if (strlen($response) < 4) {
+                            return false;
+                        }
+                        extract(unpack('Nlength', $this->_string_shift($response, 4)));
+                        $longname = $this->_string_shift($response, $length);
+                        $attributes = $this->_parseAttributes($response);
+                        if (!isset($attributes['type'])) {
+                            $fileType = $this->_parseLongname($longname);
+                            if ($fileType) {
+                                $attributes['type'] = $fileType;
+                            }
+                        }
+                        $contents[$shortname] = $attributes + array('filename' => $shortname);
+
+                        if (isset($attributes['type']) && $attributes['type'] == NET_SFTP_TYPE_DIRECTORY && ($shortname != '.' && $shortname != '..')) {
+                            $this->_update_stat_cache($dir . '/' . $shortname, array());
+                        } else {
+                            if ($shortname == '..') {
+                                $temp = $this->_realpath($dir . '/..') . '/.';
+                            } else {
+                                $temp = $dir . '/' . $shortname;
+                            }
+                            $this->_update_stat_cache($temp, (object) array('lstat' => $attributes));
+                        }
+                        // SFTPv6 has an optional boolean end-of-list field, but we'll ignore that, since the
+                        // final SSH_FXP_STATUS packet should tell us that, already.
+                    }
+                    break;
+                case NET_SFTP_STATUS:
+                    if (strlen($response) < 4) {
+                        return false;
+                    }
+                    extract(unpack('Nstatus', $this->_string_shift($response, 4)));
+                    if ($status != NET_SFTP_STATUS_EOF) {
+                        $this->_logError($response, $status);
+                        return false;
+                    }
+                    break 2;
+                default:
+                    user_error('Expected SSH_FXP_NAME or SSH_FXP_STATUS');
+                    return false;
+            }
+        }
+
+        if (!$this->_close_handle($handle)) {
+            return false;
+        }
+
+        if (count($this->sortOptions)) {
+            uasort($contents, array(&$this, '_comparator'));
+        }
+
+        return $raw ? $contents : array_keys($contents);
+    }
+
+    /**
+     * Compares two rawlist entries using parameters set by setListOrder()
+     *
+     * Intended for use with uasort()
+     *
+     * @param array $a
+     * @param array $b
+     * @return int
+     * @access private
+     */
+    function _comparator($a, $b)
+    {
+        switch (true) {
+            case $a['filename'] === '.' || $b['filename'] === '.':
+                if ($a['filename'] === $b['filename']) {
+                    return 0;
+                }
+                return $a['filename'] === '.' ? -1 : 1;
+            case $a['filename'] === '..' || $b['filename'] === '..':
+                if ($a['filename'] === $b['filename']) {
+                    return 0;
+                }
+                return $a['filename'] === '..' ? -1 : 1;
+            case isset($a['type']) && $a['type'] === NET_SFTP_TYPE_DIRECTORY:
+                if (!isset($b['type'])) {
+                    return 1;
+                }
+                if ($b['type'] !== $a['type']) {
+                    return -1;
+                }
+                break;
+            case isset($b['type']) && $b['type'] === NET_SFTP_TYPE_DIRECTORY:
+                return 1;
+        }
+        foreach ($this->sortOptions as $sort => $order) {
+            if (!isset($a[$sort]) || !isset($b[$sort])) {
+                if (isset($a[$sort])) {
+                    return -1;
+                }
+                if (isset($b[$sort])) {
+                    return 1;
+                }
+                return 0;
+            }
+            switch ($sort) {
+                case 'filename':
+                    $result = strcasecmp($a['filename'], $b['filename']);
+                    if ($result) {
+                        return $order === SORT_DESC ? -$result : $result;
+                    }
+                    break;
+                case 'permissions':
+                case 'mode':
+                    $a[$sort]&= 07777;
+                    $b[$sort]&= 07777;
+                default:
+                    if ($a[$sort] === $b[$sort]) {
+                        break;
+                    }
+                    return $order === SORT_ASC ? $a[$sort] - $b[$sort] : $b[$sort] - $a[$sort];
+            }
+        }
+    }
+
+    /**
+     * Defines how nlist() and rawlist() will be sorted - if at all.
+     *
+     * If sorting is enabled directories and files will be sorted independently with
+     * directories appearing before files in the resultant array that is returned.
+     *
+     * Any parameter returned by stat is a valid sort parameter for this function.
+     * Filename comparisons are case insensitive.
+     *
+     * Examples:
+     *
+     * $sftp->setListOrder('filename', SORT_ASC);
+     * $sftp->setListOrder('size', SORT_DESC, 'filename', SORT_ASC);
+     * $sftp->setListOrder(true);
+     *    Separates directories from files but doesn't do any sorting beyond that
+     * $sftp->setListOrder();
+     *    Don't do any sort of sorting
+     *
+     * @access public
+     */
+    function setListOrder()
+    {
+        $this->sortOptions = array();
+        $args = func_get_args();
+        if (empty($args)) {
+            return;
+        }
+        $len = count($args) & 0x7FFFFFFE;
+        for ($i = 0; $i < $len; $i+=2) {
+            $this->sortOptions[$args[$i]] = $args[$i + 1];
+        }
+        if (!count($this->sortOptions)) {
+            $this->sortOptions = array('bogus' => true);
+        }
+    }
+
+    /**
+     * Returns the file size, in bytes, or false, on failure
+     *
+     * Files larger than 4GB will show up as being exactly 4GB.
+     *
+     * @param string $filename
+     * @return mixed
+     * @access public
+     */
+    function size($filename)
+    {
+        if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
+            return false;
+        }
+
+        $result = $this->stat($filename);
+        if ($result === false) {
+            return false;
+        }
+        return isset($result['size']) ? $result['size'] : -1;
+    }
+
+    /**
+     * Save files / directories to cache
+     *
+     * @param string $path
+     * @param mixed $value
+     * @access private
+     */
+    function _update_stat_cache($path, $value)
+    {
+        if ($this->use_stat_cache === false) {
+            return;
+        }
+
+        // preg_replace('#^/|/(?=/)|/$#', '', $dir) == str_replace('//', '/', trim($path, '/'))
+        $dirs = explode('/', preg_replace('#^/|/(?=/)|/$#', '', $path));
+
+        $temp = &$this->stat_cache;
+        $max = count($dirs) - 1;
+        foreach ($dirs as $i => $dir) {
+            // if $temp is an object that means one of two things.
+            //  1. a file was deleted and changed to a directory behind phpseclib's back
+            //  2. it's a symlink. when lstat is done it's unclear what it's a symlink to
+            if (is_object($temp)) {
+                $temp = array();
+            }
+            if (!isset($temp[$dir])) {
+                $temp[$dir] = array();
+            }
+            if ($i === $max) {
+                if (is_object($temp[$dir]) && is_object($value)) {
+                    if (!isset($value->stat) && isset($temp[$dir]->stat)) {
+                        $value->stat = $temp[$dir]->stat;
+                    }
+                    if (!isset($value->lstat) && isset($temp[$dir]->lstat)) {
+                        $value->lstat = $temp[$dir]->lstat;
+                    }
+                }
+                $temp[$dir] = $value;
+                break;
+            }
+            $temp = &$temp[$dir];
+        }
+    }
+
+    /**
+     * Remove files / directories from cache
+     *
+     * @param string $path
+     * @return bool
+     * @access private
+     */
+    function _remove_from_stat_cache($path)
+    {
+        $dirs = explode('/', preg_replace('#^/|/(?=/)|/$#', '', $path));
+
+        $temp = &$this->stat_cache;
+        $max = count($dirs) - 1;
+        foreach ($dirs as $i => $dir) {
+            if ($i === $max) {
+                unset($temp[$dir]);
+                return true;
+            }
+            if (!isset($temp[$dir])) {
+                return false;
+            }
+            $temp = &$temp[$dir];
+        }
+    }
+
+    /**
+     * Checks cache for path
+     *
+     * Mainly used by file_exists
+     *
+     * @param string $dir
+     * @return mixed
+     * @access private
+     */
+    function _query_stat_cache($path)
+    {
+        $dirs = explode('/', preg_replace('#^/|/(?=/)|/$#', '', $path));
+
+        $temp = &$this->stat_cache;
+        foreach ($dirs as $dir) {
+            if (!isset($temp[$dir])) {
+                return null;
+            }
+            $temp = &$temp[$dir];
+        }
+        return $temp;
+    }
+
+    /**
+     * Returns general information about a file.
+     *
+     * Returns an array on success and false otherwise.
+     *
+     * @param string $filename
+     * @return mixed
+     * @access public
+     */
+    function stat($filename)
+    {
+        if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
+            return false;
+        }
+
+        $filename = $this->_realpath($filename);
+        if ($filename === false) {
+            return false;
+        }
+
+        if ($this->use_stat_cache) {
+            $result = $this->_query_stat_cache($filename);
+            if (is_array($result) && isset($result['.']) && isset($result['.']->stat)) {
+                return $result['.']->stat;
+            }
+            if (is_object($result) && isset($result->stat)) {
+                return $result->stat;
+            }
+        }
+
+        $stat = $this->_stat($filename, NET_SFTP_STAT);
+        if ($stat === false) {
+            $this->_remove_from_stat_cache($filename);
+            return false;
+        }
+        if (isset($stat['type'])) {
+            if ($stat['type'] == NET_SFTP_TYPE_DIRECTORY) {
+                $filename.= '/.';
+            }
+            $this->_update_stat_cache($filename, (object) array('stat' => $stat));
+            return $stat;
+        }
+
+        $pwd = $this->pwd;
+        $stat['type'] = $this->chdir($filename) ?
+            NET_SFTP_TYPE_DIRECTORY :
+            NET_SFTP_TYPE_REGULAR;
+        $this->pwd = $pwd;
+
+        if ($stat['type'] == NET_SFTP_TYPE_DIRECTORY) {
+            $filename.= '/.';
+        }
+        $this->_update_stat_cache($filename, (object) array('stat' => $stat));
+
+        return $stat;
+    }
+
+    /**
+     * Returns general information about a file or symbolic link.
+     *
+     * Returns an array on success and false otherwise.
+     *
+     * @param string $filename
+     * @return mixed
+     * @access public
+     */
+    function lstat($filename)
+    {
+        if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
+            return false;
+        }
+
+        $filename = $this->_realpath($filename);
+        if ($filename === false) {
+            return false;
+        }
+
+        if ($this->use_stat_cache) {
+            $result = $this->_query_stat_cache($filename);
+            if (is_array($result) && isset($result['.']) && isset($result['.']->lstat)) {
+                return $result['.']->lstat;
+            }
+            if (is_object($result) && isset($result->lstat)) {
+                return $result->lstat;
+            }
+        }
+
+        $lstat = $this->_stat($filename, NET_SFTP_LSTAT);
+        if ($lstat === false) {
+            $this->_remove_from_stat_cache($filename);
+            return false;
+        }
+        if (isset($lstat['type'])) {
+            if ($lstat['type'] == NET_SFTP_TYPE_DIRECTORY) {
+                $filename.= '/.';
+            }
+            $this->_update_stat_cache($filename, (object) array('lstat' => $lstat));
+            return $lstat;
+        }
+
+        $stat = $this->_stat($filename, NET_SFTP_STAT);
+
+        if ($lstat != $stat) {
+            $lstat = array_merge($lstat, array('type' => NET_SFTP_TYPE_SYMLINK));
+            $this->_update_stat_cache($filename, (object) array('lstat' => $lstat));
+            return $stat;
+        }
+
+        $pwd = $this->pwd;
+        $lstat['type'] = $this->chdir($filename) ?
+            NET_SFTP_TYPE_DIRECTORY :
+            NET_SFTP_TYPE_REGULAR;
+        $this->pwd = $pwd;
+
+        if ($lstat['type'] == NET_SFTP_TYPE_DIRECTORY) {
+            $filename.= '/.';
+        }
+        $this->_update_stat_cache($filename, (object) array('lstat' => $lstat));
+
+        return $lstat;
+    }
+
+    /**
+     * Returns general information about a file or symbolic link
+     *
+     * Determines information without calling Net_SFTP::realpath().
+     * The second parameter can be either NET_SFTP_STAT or NET_SFTP_LSTAT.
+     *
+     * @param string $filename
+     * @param int $type
+     * @return mixed
+     * @access private
+     */
+    function _stat($filename, $type)
+    {
+        // SFTPv4+ adds an additional 32-bit integer field - flags - to the following:
+        $packet = pack('Na*', strlen($filename), $filename);
+        if (!$this->_send_sftp_packet($type, $packet)) {
+            return false;
+        }
+
+        $response = $this->_get_sftp_packet();
+        switch ($this->packet_type) {
+            case NET_SFTP_ATTRS:
+                return $this->_parseAttributes($response);
+            case NET_SFTP_STATUS:
+                $this->_logError($response);
+                return false;
+        }
+
+        user_error('Expected SSH_FXP_ATTRS or SSH_FXP_STATUS');
+        return false;
+    }
+
+    /**
+     * Truncates a file to a given length
+     *
+     * @param string $filename
+     * @param int $new_size
+     * @return bool
+     * @access public
+     */
+    function truncate($filename, $new_size)
+    {
+        $attr = pack('N3', NET_SFTP_ATTR_SIZE, $new_size / 4294967296, $new_size); // 4294967296 == 0x100000000 == 1<<32
+
+        return $this->_setstat($filename, $attr, false);
+    }
+
+    /**
+     * Sets access and modification time of file.
+     *
+     * If the file does not exist, it will be created.
+     *
+     * @param string $filename
+     * @param int $time
+     * @param int $atime
+     * @return bool
+     * @access public
+     */
+    function touch($filename, $time = null, $atime = null)
+    {
+        if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
+            return false;
+        }
+
+        $filename = $this->_realpath($filename);
+        if ($filename === false) {
+            return false;
+        }
+
+        if (!isset($time)) {
+            $time = time();
+        }
+        if (!isset($atime)) {
+            $atime = $time;
+        }
+
+        $flags = NET_SFTP_OPEN_WRITE | NET_SFTP_OPEN_CREATE | NET_SFTP_OPEN_EXCL;
+        $attr = pack('N3', NET_SFTP_ATTR_ACCESSTIME, $time, $atime);
+        $packet = pack('Na*Na*', strlen($filename), $filename, $flags, $attr);
+        if (!$this->_send_sftp_packet(NET_SFTP_OPEN, $packet)) {
+            return false;
+        }
+
+        $response = $this->_get_sftp_packet();
+        switch ($this->packet_type) {
+            case NET_SFTP_HANDLE:
+                return $this->_close_handle(substr($response, 4));
+            case NET_SFTP_STATUS:
+                $this->_logError($response);
+                break;
+            default:
+                user_error('Expected SSH_FXP_HANDLE or SSH_FXP_STATUS');
+                return false;
+        }
+
+        return $this->_setstat($filename, $attr, false);
+    }
+
+    /**
+     * Changes file or directory owner
+     *
+     * Returns true on success or false on error.
+     *
+     * @param string $filename
+     * @param int $uid
+     * @param bool $recursive
+     * @return bool
+     * @access public
+     */
+    function chown($filename, $uid, $recursive = false)
+    {
+        // quoting from <http://www.kernel.org/doc/man-pages/online/pages/man2/chown.2.html>,
+        // "if the owner or group is specified as -1, then that ID is not changed"
+        $attr = pack('N3', NET_SFTP_ATTR_UIDGID, $uid, -1);
+
+        return $this->_setstat($filename, $attr, $recursive);
+    }
+
+    /**
+     * Changes file or directory group
+     *
+     * Returns true on success or false on error.
+     *
+     * @param string $filename
+     * @param int $gid
+     * @param bool $recursive
+     * @return bool
+     * @access public
+     */
+    function chgrp($filename, $gid, $recursive = false)
+    {
+        $attr = pack('N3', NET_SFTP_ATTR_UIDGID, -1, $gid);
+
+        return $this->_setstat($filename, $attr, $recursive);
+    }
+
+    /**
+     * Set permissions on a file.
+     *
+     * Returns the new file permissions on success or false on error.
+     * If $recursive is true than this just returns true or false.
+     *
+     * @param int $mode
+     * @param string $filename
+     * @param bool $recursive
+     * @return mixed
+     * @access public
+     */
+    function chmod($mode, $filename, $recursive = false)
+    {
+        if (is_string($mode) && is_int($filename)) {
+            $temp = $mode;
+            $mode = $filename;
+            $filename = $temp;
+        }
+
+        $attr = pack('N2', NET_SFTP_ATTR_PERMISSIONS, $mode & 07777);
+        if (!$this->_setstat($filename, $attr, $recursive)) {
+            return false;
+        }
+        if ($recursive) {
+            return true;
+        }
+
+        $filename = $this->realpath($filename);
+        // rather than return what the permissions *should* be, we'll return what they actually are.  this will also
+        // tell us if the file actually exists.
+        // incidentally, SFTPv4+ adds an additional 32-bit integer field - flags - to the following:
+        $packet = pack('Na*', strlen($filename), $filename);
+        if (!$this->_send_sftp_packet(NET_SFTP_STAT, $packet)) {
+            return false;
+        }
+
+        $response = $this->_get_sftp_packet();
+        switch ($this->packet_type) {
+            case NET_SFTP_ATTRS:
+                $attrs = $this->_parseAttributes($response);
+                return $attrs['permissions'];
+            case NET_SFTP_STATUS:
+                $this->_logError($response);
+                return false;
+        }
+
+        user_error('Expected SSH_FXP_ATTRS or SSH_FXP_STATUS');
+        return false;
+    }
+
+    /**
+     * Sets information about a file
+     *
+     * @param string $filename
+     * @param string $attr
+     * @param bool $recursive
+     * @return bool
+     * @access private
+     */
+    function _setstat($filename, $attr, $recursive)
+    {
+        if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
+            return false;
+        }
+
+        $filename = $this->_realpath($filename);
+        if ($filename === false) {
+            return false;
+        }
+
+        $this->_remove_from_stat_cache($filename);
+
+        if ($recursive) {
+            $i = 0;
+            $result = $this->_setstat_recursive($filename, $attr, $i);
+            $this->_read_put_responses($i);
+            return $result;
+        }
+
+        // SFTPv4+ has an additional byte field - type - that would need to be sent, as well. setting it to
+        // SSH_FILEXFER_TYPE_UNKNOWN might work. if not, we'd have to do an SSH_FXP_STAT before doing an SSH_FXP_SETSTAT.
+        if (!$this->_send_sftp_packet(NET_SFTP_SETSTAT, pack('Na*a*', strlen($filename), $filename, $attr))) {
+            return false;
+        }
+
+        /*
+         "Because some systems must use separate system calls to set various attributes, it is possible that a failure
+          response will be returned, but yet some of the attributes may be have been successfully modified.  If possible,
+          servers SHOULD avoid this situation; however, clients MUST be aware that this is possible."
+
+          -- http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-8.6
+        */
+        $response = $this->_get_sftp_packet();
+        if ($this->packet_type != NET_SFTP_STATUS) {
+            user_error('Expected SSH_FXP_STATUS');
+            return false;
+        }
+
+        if (strlen($response) < 4) {
+            return false;
+        }
+        extract(unpack('Nstatus', $this->_string_shift($response, 4)));
+        if ($status != NET_SFTP_STATUS_OK) {
+            $this->_logError($response, $status);
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * Recursively sets information on directories on the SFTP server
+     *
+     * Minimizes directory lookups and SSH_FXP_STATUS requests for speed.
+     *
+     * @param string $path
+     * @param string $attr
+     * @param int $i
+     * @return bool
+     * @access private
+     */
+    function _setstat_recursive($path, $attr, &$i)
+    {
+        if (!$this->_read_put_responses($i)) {
+            return false;
+        }
+        $i = 0;
+        $entries = $this->_list($path, true);
+
+        if ($entries === false) {
+            return $this->_setstat($path, $attr, false);
+        }
+
+        // normally $entries would have at least . and .. but it might not if the directories
+        // permissions didn't allow reading
+        if (empty($entries)) {
+            return false;
+        }
+
+        unset($entries['.'], $entries['..']);
+        foreach ($entries as $filename => $props) {
+            if (!isset($props['type'])) {
+                return false;
+            }
+
+            $temp = $path . '/' . $filename;
+            if ($props['type'] == NET_SFTP_TYPE_DIRECTORY) {
+                if (!$this->_setstat_recursive($temp, $attr, $i)) {
+                    return false;
+                }
+            } else {
+                if (!$this->_send_sftp_packet(NET_SFTP_SETSTAT, pack('Na*a*', strlen($temp), $temp, $attr))) {
+                    return false;
+                }
+
+                $i++;
+
+                if ($i >= NET_SFTP_QUEUE_SIZE) {
+                    if (!$this->_read_put_responses($i)) {
+                        return false;
+                    }
+                    $i = 0;
+                }
+            }
+        }
+
+        if (!$this->_send_sftp_packet(NET_SFTP_SETSTAT, pack('Na*a*', strlen($path), $path, $attr))) {
+            return false;
+        }
+
+        $i++;
+
+        if ($i >= NET_SFTP_QUEUE_SIZE) {
+            if (!$this->_read_put_responses($i)) {
+                return false;
+            }
+            $i = 0;
+        }
+
+        return true;
+    }
+
+    /**
+     * Return the target of a symbolic link
+     *
+     * @param string $link
+     * @return mixed
+     * @access public
+     */
+    function readlink($link)
+    {
+        if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
+            return false;
+        }
+
+        $link = $this->_realpath($link);
+
+        if (!$this->_send_sftp_packet(NET_SFTP_READLINK, pack('Na*', strlen($link), $link))) {
+            return false;
+        }
+
+        $response = $this->_get_sftp_packet();
+        switch ($this->packet_type) {
+            case NET_SFTP_NAME:
+                break;
+            case NET_SFTP_STATUS:
+                $this->_logError($response);
+                return false;
+            default:
+                user_error('Expected SSH_FXP_NAME or SSH_FXP_STATUS');
+                return false;
+        }
+
+        if (strlen($response) < 4) {
+            return false;
+        }
+        extract(unpack('Ncount', $this->_string_shift($response, 4)));
+        // the file isn't a symlink
+        if (!$count) {
+            return false;
+        }
+
+        if (strlen($response) < 4) {
+            return false;
+        }
+        extract(unpack('Nlength', $this->_string_shift($response, 4)));
+        return $this->_string_shift($response, $length);
+    }
+
+    /**
+     * Create a symlink
+     *
+     * symlink() creates a symbolic link to the existing target with the specified name link.
+     *
+     * @param string $target
+     * @param string $link
+     * @return bool
+     * @access public
+     */
+    function symlink($target, $link)
+    {
+        if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
+            return false;
+        }
+
+        //$target = $this->_realpath($target);
+        $link = $this->_realpath($link);
+
+        $packet = pack('Na*Na*', strlen($target), $target, strlen($link), $link);
+        if (!$this->_send_sftp_packet(NET_SFTP_SYMLINK, $packet)) {
+            return false;
+        }
+
+        $response = $this->_get_sftp_packet();
+        if ($this->packet_type != NET_SFTP_STATUS) {
+            user_error('Expected SSH_FXP_STATUS');
+            return false;
+        }
+
+        if (strlen($response) < 4) {
+            return false;
+        }
+        extract(unpack('Nstatus', $this->_string_shift($response, 4)));
+        if ($status != NET_SFTP_STATUS_OK) {
+            $this->_logError($response, $status);
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * Creates a directory.
+     *
+     * @param string $dir
+     * @return bool
+     * @access public
+     */
+    function mkdir($dir, $mode = -1, $recursive = false)
+    {
+        if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
+            return false;
+        }
+
+        $dir = $this->_realpath($dir);
+        // by not providing any permissions, hopefully the server will use the logged in users umask - their
+        // default permissions.
+        $attr = $mode == -1 ? "\0\0\0\0" : pack('N2', NET_SFTP_ATTR_PERMISSIONS, $mode & 07777);
+
+        if ($recursive) {
+            $dirs = explode('/', preg_replace('#/(?=/)|/$#', '', $dir));
+            if (empty($dirs[0])) {
+                array_shift($dirs);
+                $dirs[0] = '/' . $dirs[0];
+            }
+            for ($i = 0; $i < count($dirs); $i++) {
+                $temp = array_slice($dirs, 0, $i + 1);
+                $temp = implode('/', $temp);
+                $result = $this->_mkdir_helper($temp, $attr);
+            }
+            return $result;
+        }
+
+        return $this->_mkdir_helper($dir, $attr);
+    }
+
+    /**
+     * Helper function for directory creation
+     *
+     * @param string $dir
+     * @return bool
+     * @access private
+     */
+    function _mkdir_helper($dir, $attr)
+    {
+        if (!$this->_send_sftp_packet(NET_SFTP_MKDIR, pack('Na*a*', strlen($dir), $dir, $attr))) {
+            return false;
+        }
+
+        $response = $this->_get_sftp_packet();
+        if ($this->packet_type != NET_SFTP_STATUS) {
+            user_error('Expected SSH_FXP_STATUS');
+            return false;
+        }
+
+        if (strlen($response) < 4) {
+            return false;
+        }
+        extract(unpack('Nstatus', $this->_string_shift($response, 4)));
+        if ($status != NET_SFTP_STATUS_OK) {
+            $this->_logError($response, $status);
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * Removes a directory.
+     *
+     * @param string $dir
+     * @return bool
+     * @access public
+     */
+    function rmdir($dir)
+    {
+        if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
+            return false;
+        }
+
+        $dir = $this->_realpath($dir);
+        if ($dir === false) {
+            return false;
+        }
+
+        if (!$this->_send_sftp_packet(NET_SFTP_RMDIR, pack('Na*', strlen($dir), $dir))) {
+            return false;
+        }
+
+        $response = $this->_get_sftp_packet();
+        if ($this->packet_type != NET_SFTP_STATUS) {
+            user_error('Expected SSH_FXP_STATUS');
+            return false;
+        }
+
+        if (strlen($response) < 4) {
+            return false;
+        }
+        extract(unpack('Nstatus', $this->_string_shift($response, 4)));
+        if ($status != NET_SFTP_STATUS_OK) {
+            // presumably SSH_FX_NO_SUCH_FILE or SSH_FX_PERMISSION_DENIED?
+            $this->_logError($response, $status);
+            return false;
+        }
+
+        $this->_remove_from_stat_cache($dir);
+        // the following will do a soft delete, which would be useful if you deleted a file
+        // and then tried to do a stat on the deleted file. the above, in contrast, does
+        // a hard delete
+        //$this->_update_stat_cache($dir, false);
+
+        return true;
+    }
+
+    /**
+     * Uploads a file to the SFTP server.
+     *
+     * By default, Net_SFTP::put() does not read from the local filesystem.  $data is dumped directly into $remote_file.
+     * So, for example, if you set $data to 'filename.ext' and then do Net_SFTP::get(), you will get a file, twelve bytes
+     * long, containing 'filename.ext' as its contents.
+     *
+     * Setting $mode to NET_SFTP_LOCAL_FILE will change the above behavior.  With NET_SFTP_LOCAL_FILE, $remote_file will
+     * contain as many bytes as filename.ext does on your local filesystem.  If your filename.ext is 1MB then that is how
+     * large $remote_file will be, as well.
+     *
+     * If $data is a resource then it'll be used as a resource instead.
+     *
+     *
+     * Setting $mode to NET_SFTP_CALLBACK will use $data as callback function, which gets only one parameter -- number
+     * of bytes to return, and returns a string if there is some data or null if there is no more data
+     *
+     * Currently, only binary mode is supported.  As such, if the line endings need to be adjusted, you will need to take
+     * care of that, yourself.
+     *
+     * $mode can take an additional two parameters - NET_SFTP_RESUME and NET_SFTP_RESUME_START. These are bitwise AND'd with
+     * $mode. So if you want to resume upload of a 300mb file on the local file system you'd set $mode to the following:
+     *
+     * NET_SFTP_LOCAL_FILE | NET_SFTP_RESUME
+     *
+     * If you wanted to simply append the full contents of a local file to the full contents of a remote file you'd replace
+     * NET_SFTP_RESUME with NET_SFTP_RESUME_START.
+     *
+     * If $mode & (NET_SFTP_RESUME | NET_SFTP_RESUME_START) then NET_SFTP_RESUME_START will be assumed.
+     *
+     * $start and $local_start give you more fine grained control over this process and take precident over NET_SFTP_RESUME
+     * when they're non-negative. ie. $start could let you write at the end of a file (like NET_SFTP_RESUME) or in the middle
+     * of one. $local_start could let you start your reading from the end of a file (like NET_SFTP_RESUME_START) or in the
+     * middle of one.
+     *
+     * Setting $local_start to > 0 or $mode | NET_SFTP_RESUME_START doesn't do anything unless $mode | NET_SFTP_LOCAL_FILE.
+     *
+     * @param string $remote_file
+     * @param string|resource $data
+     * @param int $mode
+     * @param int $start
+     * @param int $local_start
+     * @param callable|null $progressCallback
+     * @return bool
+     * @access public
+     * @internal ASCII mode for SFTPv4/5/6 can be supported by adding a new function - Net_SFTP::setMode().
+     */
+    function put($remote_file, $data, $mode = NET_SFTP_STRING, $start = -1, $local_start = -1, $progressCallback = null)
+    {
+        if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
+            return false;
+        }
+
+        $remote_file = $this->_realpath($remote_file);
+        if ($remote_file === false) {
+            return false;
+        }
+
+        $this->_remove_from_stat_cache($remote_file);
+
+        $flags = NET_SFTP_OPEN_WRITE | NET_SFTP_OPEN_CREATE;
+        // according to the SFTP specs, NET_SFTP_OPEN_APPEND should "force all writes to append data at the end of the file."
+        // in practice, it doesn't seem to do that.
+        //$flags|= ($mode & NET_SFTP_RESUME) ? NET_SFTP_OPEN_APPEND : NET_SFTP_OPEN_TRUNCATE;
+
+        if ($start >= 0) {
+            $offset = $start;
+        } elseif ($mode & NET_SFTP_RESUME) {
+            // if NET_SFTP_OPEN_APPEND worked as it should _size() wouldn't need to be called
+            $size = $this->size($remote_file);
+            $offset = $size !== false ? $size : 0;
+        } else {
+            $offset = 0;
+            $flags|= NET_SFTP_OPEN_TRUNCATE;
+        }
+
+        $packet = pack('Na*N2', strlen($remote_file), $remote_file, $flags, 0);
+        if (!$this->_send_sftp_packet(NET_SFTP_OPEN, $packet)) {
+            return false;
+        }
+
+        $response = $this->_get_sftp_packet();
+        switch ($this->packet_type) {
+            case NET_SFTP_HANDLE:
+                $handle = substr($response, 4);
+                break;
+            case NET_SFTP_STATUS:
+                $this->_logError($response);
+                return false;
+            default:
+                user_error('Expected SSH_FXP_HANDLE or SSH_FXP_STATUS');
+                return false;
+        }
+
+        // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-8.2.3
+        $dataCallback = false;
+        switch (true) {
+            case $mode & NET_SFTP_CALLBACK:
+                if (!is_callable($data)) {
+                    user_error("\$data should be is_callable if you set NET_SFTP_CALLBACK flag");
+                }
+                $dataCallback = $data;
+                // do nothing
+                break;
+            case is_resource($data):
+                $mode = $mode & ~NET_SFTP_LOCAL_FILE;
+                $info = stream_get_meta_data($data);
+                if ($info['wrapper_type'] == 'PHP' && $info['stream_type'] == 'Input') {
+                    $fp = fopen('php://memory', 'w+');
+                    stream_copy_to_stream($data, $fp);
+                    rewind($fp);
+                } else {
+                    $fp = $data;
+                }
+                break;
+            case $mode & NET_SFTP_LOCAL_FILE:
+                if (!is_file($data)) {
+                    user_error("$data is not a valid file");
+                    return false;
+                }
+                $fp = @fopen($data, 'rb');
+                if (!$fp) {
+                    return false;
+                }
+        }
+
+        if (isset($fp)) {
+            $stat = fstat($fp);
+            $size = !empty($stat) ? $stat['size'] : 0;
+
+            if ($local_start >= 0) {
+                fseek($fp, $local_start);
+                $size-= $local_start;
+            }
+        } elseif ($dataCallback) {
+            $size = 0;
+        } else {
+            $size = strlen($data);
+        }
+
+        $sent = 0;
+        $size = $size < 0 ? ($size & 0x7FFFFFFF) + 0x80000000 : $size;
+
+        $sftp_packet_size = 4096; // PuTTY uses 4096
+        // make the SFTP packet be exactly 4096 bytes by including the bytes in the NET_SFTP_WRITE packets "header"
+        $sftp_packet_size-= strlen($handle) + 25;
+        $i = 0;
+        while ($dataCallback || ($size === 0 || $sent < $size)) {
+            if ($dataCallback) {
+                $temp = call_user_func($dataCallback, $sftp_packet_size);
+                if (is_null($temp)) {
+                    break;
+                }
+            } else {
+                $temp = isset($fp) ? fread($fp, $sftp_packet_size) : substr($data, $sent, $sftp_packet_size);
+                if ($temp === false || $temp === '') {
+                    break;
+                }
+            }
+
+            $subtemp = $offset + $sent;
+            $packet = pack('Na*N3a*', strlen($handle), $handle, $subtemp / 4294967296, $subtemp, strlen($temp), $temp);
+            if (!$this->_send_sftp_packet(NET_SFTP_WRITE, $packet)) {
+                if ($mode & NET_SFTP_LOCAL_FILE) {
+                    fclose($fp);
+                }
+                return false;
+            }
+            $sent+= strlen($temp);
+            if (is_callable($progressCallback)) {
+                call_user_func($progressCallback, $sent);
+            }
+
+            $i++;
+
+            if ($i == NET_SFTP_QUEUE_SIZE) {
+                if (!$this->_read_put_responses($i)) {
+                    $i = 0;
+                    break;
+                }
+                $i = 0;
+            }
+        }
+
+        if (!$this->_read_put_responses($i)) {
+            if ($mode & NET_SFTP_LOCAL_FILE) {
+                fclose($fp);
+            }
+            $this->_close_handle($handle);
+            return false;
+        }
+
+        if ($mode & NET_SFTP_LOCAL_FILE) {
+            fclose($fp);
+        }
+
+        return $this->_close_handle($handle);
+    }
+
+    /**
+     * Reads multiple successive SSH_FXP_WRITE responses
+     *
+     * Sending an SSH_FXP_WRITE packet and immediately reading its response isn't as efficient as blindly sending out $i
+     * SSH_FXP_WRITEs, in succession, and then reading $i responses.
+     *
+     * @param int $i
+     * @return bool
+     * @access private
+     */
+    function _read_put_responses($i)
+    {
+        while ($i--) {
+            $response = $this->_get_sftp_packet();
+            if ($this->packet_type != NET_SFTP_STATUS) {
+                user_error('Expected SSH_FXP_STATUS');
+                return false;
+            }
+
+            if (strlen($response) < 4) {
+                return false;
+            }
+            extract(unpack('Nstatus', $this->_string_shift($response, 4)));
+            if ($status != NET_SFTP_STATUS_OK) {
+                $this->_logError($response, $status);
+                break;
+            }
+        }
+
+        return $i < 0;
+    }
+
+    /**
+     * Close handle
+     *
+     * @param string $handle
+     * @return bool
+     * @access private
+     */
+    function _close_handle($handle)
+    {
+        if (!$this->_send_sftp_packet(NET_SFTP_CLOSE, pack('Na*', strlen($handle), $handle))) {
+            return false;
+        }
+
+        // "The client MUST release all resources associated with the handle regardless of the status."
+        //  -- http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-8.1.3
+        $response = $this->_get_sftp_packet();
+        if ($this->packet_type != NET_SFTP_STATUS) {
+            user_error('Expected SSH_FXP_STATUS');
+            return false;
+        }
+
+        if (strlen($response) < 4) {
+            return false;
+        }
+        extract(unpack('Nstatus', $this->_string_shift($response, 4)));
+        if ($status != NET_SFTP_STATUS_OK) {
+            $this->_logError($response, $status);
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * Downloads a file from the SFTP server.
+     *
+     * Returns a string containing the contents of $remote_file if $local_file is left undefined or a boolean false if
+     * the operation was unsuccessful.  If $local_file is defined, returns true or false depending on the success of the
+     * operation.
+     *
+     * $offset and $length can be used to download files in chunks.
+     *
+     * @param string $remote_file
+     * @param string $local_file
+     * @param int $offset
+     * @param int $length
+     * @return mixed
+     * @access public
+     */
+    function get($remote_file, $local_file = false, $offset = 0, $length = -1)
+    {
+        if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
+            return false;
+        }
+
+        $remote_file = $this->_realpath($remote_file);
+        if ($remote_file === false) {
+            return false;
+        }
+
+        $packet = pack('Na*N2', strlen($remote_file), $remote_file, NET_SFTP_OPEN_READ, 0);
+        if (!$this->_send_sftp_packet(NET_SFTP_OPEN, $packet)) {
+            return false;
+        }
+
+        $response = $this->_get_sftp_packet();
+        switch ($this->packet_type) {
+            case NET_SFTP_HANDLE:
+                $handle = substr($response, 4);
+                break;
+            case NET_SFTP_STATUS: // presumably SSH_FX_NO_SUCH_FILE or SSH_FX_PERMISSION_DENIED
+                $this->_logError($response);
+                return false;
+            default:
+                user_error('Expected SSH_FXP_HANDLE or SSH_FXP_STATUS');
+                return false;
+        }
+
+        if (is_resource($local_file)) {
+            $fp = $local_file;
+            $stat = fstat($fp);
+            $res_offset = $stat['size'];
+        } else {
+            $res_offset = 0;
+            if ($local_file !== false) {
+                $fp = fopen($local_file, 'wb');
+                if (!$fp) {
+                    return false;
+                }
+            } else {
+                $content = '';
+            }
+        }
+
+        $fclose_check = $local_file !== false && !is_resource($local_file);
+
+        $start = $offset;
+        $read = 0;
+        while (true) {
+            $i = 0;
+
+            while ($i < NET_SFTP_QUEUE_SIZE && ($length < 0 || $read < $length)) {
+                $tempoffset = $start + $read;
+
+                $packet_size = $length > 0 ? min($this->max_sftp_packet, $length - $read) : $this->max_sftp_packet;
+
+                $packet = pack('Na*N3', strlen($handle), $handle, $tempoffset / 4294967296, $tempoffset, $packet_size);
+                if (!$this->_send_sftp_packet(NET_SFTP_READ, $packet)) {
+                    if ($fclose_check) {
+                        fclose($fp);
+                    }
+                    return false;
+                }
+                $packet = null;
+                $read+= $packet_size;
+                $i++;
+            }
+
+            if (!$i) {
+                break;
+            }
+
+            $clear_responses = false;
+            while ($i > 0) {
+                $i--;
+
+                if ($clear_responses) {
+                    $this->_get_sftp_packet();
+                    continue;
+                } else {
+                    $response = $this->_get_sftp_packet();
+                }
+
+                switch ($this->packet_type) {
+                    case NET_SFTP_DATA:
+                        $temp = substr($response, 4);
+                        $offset+= strlen($temp);
+                        if ($local_file === false) {
+                            $content.= $temp;
+                        } else {
+                            fputs($fp, $temp);
+                        }
+                        $temp = null;
+                        break;
+                    case NET_SFTP_STATUS:
+                        // could, in theory, return false if !strlen($content) but we'll hold off for the time being
+                        $this->_logError($response);
+                        $clear_responses = true; // don't break out of the loop yet, so we can read the remaining responses
+                        break;
+                    default:
+                        if ($fclose_check) {
+                            fclose($fp);
+                        }
+                        user_error('Expected SSH_FX_DATA or SSH_FXP_STATUS');
+                }
+                $response = null;
+            }
+
+            if ($clear_responses) {
+                break;
+            }
+        }
+
+        if ($length > 0 && $length <= $offset - $start) {
+            if ($local_file === false) {
+                $content = substr($content, 0, $length);
+            } else {
+                ftruncate($fp, $length + $res_offset);
+            }
+        }
+
+        if ($fclose_check) {
+            fclose($fp);
+        }
+
+        if (!$this->_close_handle($handle)) {
+            return false;
+        }
+
+        // if $content isn't set that means a file was written to
+        return isset($content) ? $content : true;
+    }
+
+    /**
+     * Deletes a file on the SFTP server.
+     *
+     * @param string $path
+     * @param bool $recursive
+     * @return bool
+     * @access public
+     */
+    function delete($path, $recursive = true)
+    {
+        if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
+            return false;
+        }
+
+        if (is_object($path)) {
+            // It's an object. Cast it as string before we check anything else.
+            $path = (string) $path;
+        }
+
+        if (!is_string($path) || $path == '') {
+            return false;
+        }
+
+        $path = $this->_realpath($path);
+        if ($path === false) {
+            return false;
+        }
+
+        // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-8.3
+        if (!$this->_send_sftp_packet(NET_SFTP_REMOVE, pack('Na*', strlen($path), $path))) {
+            return false;
+        }
+
+        $response = $this->_get_sftp_packet();
+        if ($this->packet_type != NET_SFTP_STATUS) {
+            user_error('Expected SSH_FXP_STATUS');
+            return false;
+        }
+
+        // if $status isn't SSH_FX_OK it's probably SSH_FX_NO_SUCH_FILE or SSH_FX_PERMISSION_DENIED
+        if (strlen($response) < 4) {
+            return false;
+        }
+        extract(unpack('Nstatus', $this->_string_shift($response, 4)));
+        if ($status != NET_SFTP_STATUS_OK) {
+            $this->_logError($response, $status);
+            if (!$recursive) {
+                return false;
+            }
+            $i = 0;
+            $result = $this->_delete_recursive($path, $i);
+            $this->_read_put_responses($i);
+            return $result;
+        }
+
+        $this->_remove_from_stat_cache($path);
+
+        return true;
+    }
+
+    /**
+     * Recursively deletes directories on the SFTP server
+     *
+     * Minimizes directory lookups and SSH_FXP_STATUS requests for speed.
+     *
+     * @param string $path
+     * @param int $i
+     * @return bool
+     * @access private
+     */
+    function _delete_recursive($path, &$i)
+    {
+        if (!$this->_read_put_responses($i)) {
+            return false;
+        }
+        $i = 0;
+        $entries = $this->_list($path, true);
+
+        // normally $entries would have at least . and .. but it might not if the directories
+        // permissions didn't allow reading
+        if (empty($entries)) {
+            return false;
+        }
+
+        unset($entries['.'], $entries['..']);
+        foreach ($entries as $filename => $props) {
+            if (!isset($props['type'])) {
+                return false;
+            }
+
+            $temp = $path . '/' . $filename;
+            if ($props['type'] == NET_SFTP_TYPE_DIRECTORY) {
+                if (!$this->_delete_recursive($temp, $i)) {
+                    return false;
+                }
+            } else {
+                if (!$this->_send_sftp_packet(NET_SFTP_REMOVE, pack('Na*', strlen($temp), $temp))) {
+                    return false;
+                }
+                $this->_remove_from_stat_cache($temp);
+
+                $i++;
+
+                if ($i >= NET_SFTP_QUEUE_SIZE) {
+                    if (!$this->_read_put_responses($i)) {
+                        return false;
+                    }
+                    $i = 0;
+                }
+            }
+        }
+
+        if (!$this->_send_sftp_packet(NET_SFTP_RMDIR, pack('Na*', strlen($path), $path))) {
+            return false;
+        }
+        $this->_remove_from_stat_cache($path);
+
+        $i++;
+
+        if ($i >= NET_SFTP_QUEUE_SIZE) {
+            if (!$this->_read_put_responses($i)) {
+                return false;
+            }
+            $i = 0;
+        }
+
+        return true;
+    }
+
+    /**
+     * Checks whether a file or directory exists
+     *
+     * @param string $path
+     * @return bool
+     * @access public
+     */
+    function file_exists($path)
+    {
+        if ($this->use_stat_cache) {
+            $path = $this->_realpath($path);
+
+            $result = $this->_query_stat_cache($path);
+
+            if (isset($result)) {
+                // return true if $result is an array or if it's an stdClass object
+                return $result !== false;
+            }
+        }
+
+        return $this->stat($path) !== false;
+    }
+
+    /**
+     * Tells whether the filename is a directory
+     *
+     * @param string $path
+     * @return bool
+     * @access public
+     */
+    function is_dir($path)
+    {
+        $result = $this->_get_stat_cache_prop($path, 'type');
+        if ($result === false) {
+            return false;
+        }
+        return $result === NET_SFTP_TYPE_DIRECTORY;
+    }
+
+    /**
+     * Tells whether the filename is a regular file
+     *
+     * @param string $path
+     * @return bool
+     * @access public
+     */
+    function is_file($path)
+    {
+        $result = $this->_get_stat_cache_prop($path, 'type');
+        if ($result === false) {
+            return false;
+        }
+        return $result === NET_SFTP_TYPE_REGULAR;
+    }
+
+    /**
+     * Tells whether the filename is a symbolic link
+     *
+     * @param string $path
+     * @return bool
+     * @access public
+     */
+    function is_link($path)
+    {
+        $result = $this->_get_lstat_cache_prop($path, 'type');
+        if ($result === false) {
+            return false;
+        }
+        return $result === NET_SFTP_TYPE_SYMLINK;
+    }
+
+    /**
+     * Tells whether a file exists and is readable
+     *
+     * @param string $path
+     * @return bool
+     * @access public
+     */
+    function is_readable($path)
+    {
+        $path = $this->_realpath($path);
+
+        $packet = pack('Na*N2', strlen($path), $path, NET_SFTP_OPEN_READ, 0);
+        if (!$this->_send_sftp_packet(NET_SFTP_OPEN, $packet)) {
+            return false;
+        }
+
+        $response = $this->_get_sftp_packet();
+        switch ($this->packet_type) {
+            case NET_SFTP_HANDLE:
+                return true;
+            case NET_SFTP_STATUS: // presumably SSH_FX_NO_SUCH_FILE or SSH_FX_PERMISSION_DENIED
+                return false;
+            default:
+                user_error('Expected SSH_FXP_HANDLE or SSH_FXP_STATUS');
+                return false;
+        }
+    }
+
+    /**
+     * Tells whether the filename is writable
+     *
+     * @param string $path
+     * @return bool
+     * @access public
+     */
+    function is_writable($path)
+    {
+        $path = $this->_realpath($path);
+
+        $packet = pack('Na*N2', strlen($path), $path, NET_SFTP_OPEN_WRITE, 0);
+        if (!$this->_send_sftp_packet(NET_SFTP_OPEN, $packet)) {
+            return false;
+        }
+
+        $response = $this->_get_sftp_packet();
+        switch ($this->packet_type) {
+            case NET_SFTP_HANDLE:
+                return true;
+            case NET_SFTP_STATUS: // presumably SSH_FX_NO_SUCH_FILE or SSH_FX_PERMISSION_DENIED
+                return false;
+            default:
+                user_error('Expected SSH_FXP_HANDLE or SSH_FXP_STATUS');
+                return false;
+        }
+    }
+
+    /**
+     * Tells whether the filename is writeable
+     *
+     * Alias of is_writable
+     *
+     * @param string $path
+     * @return bool
+     * @access public
+     */
+    function is_writeable($path)
+    {
+        return $this->is_writable($path);
+    }
+
+    /**
+     * Gets last access time of file
+     *
+     * @param string $path
+     * @return mixed
+     * @access public
+     */
+    function fileatime($path)
+    {
+        return $this->_get_stat_cache_prop($path, 'atime');
+    }
+
+    /**
+     * Gets file modification time
+     *
+     * @param string $path
+     * @return mixed
+     * @access public
+     */
+    function filemtime($path)
+    {
+        return $this->_get_stat_cache_prop($path, 'mtime');
+    }
+
+    /**
+     * Gets file permissions
+     *
+     * @param string $path
+     * @return mixed
+     * @access public
+     */
+    function fileperms($path)
+    {
+        return $this->_get_stat_cache_prop($path, 'permissions');
+    }
+
+    /**
+     * Gets file owner
+     *
+     * @param string $path
+     * @return mixed
+     * @access public
+     */
+    function fileowner($path)
+    {
+        return $this->_get_stat_cache_prop($path, 'uid');
+    }
+
+    /**
+     * Gets file group
+     *
+     * @param string $path
+     * @return mixed
+     * @access public
+     */
+    function filegroup($path)
+    {
+        return $this->_get_stat_cache_prop($path, 'gid');
+    }
+
+    /**
+     * Gets file size
+     *
+     * @param string $path
+     * @return mixed
+     * @access public
+     */
+    function filesize($path)
+    {
+        return $this->_get_stat_cache_prop($path, 'size');
+    }
+
+    /**
+     * Gets file type
+     *
+     * @param string $path
+     * @return mixed
+     * @access public
+     */
+    function filetype($path)
+    {
+        $type = $this->_get_stat_cache_prop($path, 'type');
+        if ($type === false) {
+            return false;
+        }
+
+        switch ($type) {
+            case NET_SFTP_TYPE_BLOCK_DEVICE:
+                return 'block';
+            case NET_SFTP_TYPE_CHAR_DEVICE:
+                return 'char';
+            case NET_SFTP_TYPE_DIRECTORY:
+                return 'dir';
+            case NET_SFTP_TYPE_FIFO:
+                return 'fifo';
+            case NET_SFTP_TYPE_REGULAR:
+                return 'file';
+            case NET_SFTP_TYPE_SYMLINK:
+                return 'link';
+            default:
+                return false;
+        }
+    }
+
+    /**
+     * Return a stat properity
+     *
+     * Uses cache if appropriate.
+     *
+     * @param string $path
+     * @param string $prop
+     * @return mixed
+     * @access private
+     */
+    function _get_stat_cache_prop($path, $prop)
+    {
+        return $this->_get_xstat_cache_prop($path, $prop, 'stat');
+    }
+
+    /**
+     * Return an lstat properity
+     *
+     * Uses cache if appropriate.
+     *
+     * @param string $path
+     * @param string $prop
+     * @return mixed
+     * @access private
+     */
+    function _get_lstat_cache_prop($path, $prop)
+    {
+        return $this->_get_xstat_cache_prop($path, $prop, 'lstat');
+    }
+
+    /**
+     * Return a stat or lstat properity
+     *
+     * Uses cache if appropriate.
+     *
+     * @param string $path
+     * @param string $prop
+     * @return mixed
+     * @access private
+     */
+    function _get_xstat_cache_prop($path, $prop, $type)
+    {
+        if ($this->use_stat_cache) {
+            $path = $this->_realpath($path);
+
+            $result = $this->_query_stat_cache($path);
+
+            if (is_object($result) && isset($result->$type)) {
+                return $result->{$type}[$prop];
+            }
+        }
+
+        $result = $this->$type($path);
+
+        if ($result === false || !isset($result[$prop])) {
+            return false;
+        }
+
+        return $result[$prop];
+    }
+
+    /**
+     * Renames a file or a directory on the SFTP server
+     *
+     * @param string $oldname
+     * @param string $newname
+     * @return bool
+     * @access public
+     */
+    function rename($oldname, $newname)
+    {
+        if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
+            return false;
+        }
+
+        $oldname = $this->_realpath($oldname);
+        $newname = $this->_realpath($newname);
+        if ($oldname === false || $newname === false) {
+            return false;
+        }
+
+        // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-8.3
+        $packet = pack('Na*Na*', strlen($oldname), $oldname, strlen($newname), $newname);
+        if (!$this->_send_sftp_packet(NET_SFTP_RENAME, $packet)) {
+            return false;
+        }
+
+        $response = $this->_get_sftp_packet();
+        if ($this->packet_type != NET_SFTP_STATUS) {
+            user_error('Expected SSH_FXP_STATUS');
+            return false;
+        }
+
+        // if $status isn't SSH_FX_OK it's probably SSH_FX_NO_SUCH_FILE or SSH_FX_PERMISSION_DENIED
+        if (strlen($response) < 4) {
+            return false;
+        }
+        extract(unpack('Nstatus', $this->_string_shift($response, 4)));
+        if ($status != NET_SFTP_STATUS_OK) {
+            $this->_logError($response, $status);
+            return false;
+        }
+
+        // don't move the stat cache entry over since this operation could very well change the
+        // atime and mtime attributes
+        //$this->_update_stat_cache($newname, $this->_query_stat_cache($oldname));
+        $this->_remove_from_stat_cache($oldname);
+        $this->_remove_from_stat_cache($newname);
+
+        return true;
+    }
+
+    /**
+     * Parse Attributes
+     *
+     * See '7.  File Attributes' of draft-ietf-secsh-filexfer-13 for more info.
+     *
+     * @param string $response
+     * @return array
+     * @access private
+     */
+    function _parseAttributes(&$response)
+    {
+        $attr = array();
+        if (strlen($response) < 4) {
+            user_error('Malformed file attributes');
+            return array();
+        }
+        extract(unpack('Nflags', $this->_string_shift($response, 4)));
+        // SFTPv4+ have a type field (a byte) that follows the above flag field
+        foreach ($this->attributes as $key => $value) {
+            switch ($flags & $key) {
+                case NET_SFTP_ATTR_SIZE: // 0x00000001
+                    // The size attribute is defined as an unsigned 64-bit integer.
+                    // The following will use floats on 32-bit platforms, if necessary.
+                    // As can be seen in the BigInteger class, floats are generally
+                    // IEEE 754 binary64 "double precision" on such platforms and
+                    // as such can represent integers of at least 2^50 without loss
+                    // of precision. Interpreted in filesize, 2^50 bytes = 1024 TiB.
+                    $attr['size'] = hexdec(bin2hex($this->_string_shift($response, 8)));
+                    break;
+                case NET_SFTP_ATTR_UIDGID: // 0x00000002 (SFTPv3 only)
+                    if (strlen($response) < 8) {
+                        user_error('Malformed file attributes');
+                        return $attr;
+                    }
+                    $attr+= unpack('Nuid/Ngid', $this->_string_shift($response, 8));
+                    break;
+                case NET_SFTP_ATTR_PERMISSIONS: // 0x00000004
+                    if (strlen($response) < 4) {
+                        user_error('Malformed file attributes');
+                        return $attr;
+                    }
+                    $attr+= unpack('Npermissions', $this->_string_shift($response, 4));
+                    // mode == permissions; permissions was the original array key and is retained for bc purposes.
+                    // mode was added because that's the more industry standard terminology
+                    $attr+= array('mode' => $attr['permissions']);
+                    $fileType = $this->_parseMode($attr['permissions']);
+                    if ($fileType !== false) {
+                        $attr+= array('type' => $fileType);
+                    }
+                    break;
+                case NET_SFTP_ATTR_ACCESSTIME: // 0x00000008
+                    if (strlen($response) < 8) {
+                        user_error('Malformed file attributes');
+                        return $attr;
+                    }
+                    $attr+= unpack('Natime/Nmtime', $this->_string_shift($response, 8));
+                    break;
+                case NET_SFTP_ATTR_EXTENDED: // 0x80000000
+                    if (strlen($response) < 4) {
+                        user_error('Malformed file attributes');
+                        return $attr;
+                    }
+                    extract(unpack('Ncount', $this->_string_shift($response, 4)));
+                    for ($i = 0; $i < $count; $i++) {
+                        if (strlen($response) < 4) {
+                            user_error('Malformed file attributes');
+                            return $attr;
+                        }
+                        extract(unpack('Nlength', $this->_string_shift($response, 4)));
+                        $key = $this->_string_shift($response, $length);
+                        if (strlen($response) < 4) {
+                            user_error('Malformed file attributes');
+                            return $attr;
+                        }
+                        extract(unpack('Nlength', $this->_string_shift($response, 4)));
+                        $attr[$key] = $this->_string_shift($response, $length);
+                    }
+            }
+        }
+        return $attr;
+    }
+
+    /**
+     * Attempt to identify the file type
+     *
+     * Quoting the SFTP RFC, "Implementations MUST NOT send bits that are not defined" but they seem to anyway
+     *
+     * @param int $mode
+     * @return int
+     * @access private
+     */
+    function _parseMode($mode)
+    {
+        // values come from http://lxr.free-electrons.com/source/include/uapi/linux/stat.h#L12
+        // see, also, http://linux.die.net/man/2/stat
+        switch ($mode & 0170000) {// ie. 1111 0000 0000 0000
+            case 0000000: // no file type specified - figure out the file type using alternative means
+                return false;
+            case 0040000:
+                return NET_SFTP_TYPE_DIRECTORY;
+            case 0100000:
+                return NET_SFTP_TYPE_REGULAR;
+            case 0120000:
+                return NET_SFTP_TYPE_SYMLINK;
+            // new types introduced in SFTPv5+
+            // http://tools.ietf.org/html/draft-ietf-secsh-filexfer-05#section-5.2
+            case 0010000: // named pipe (fifo)
+                return NET_SFTP_TYPE_FIFO;
+            case 0020000: // character special
+                return NET_SFTP_TYPE_CHAR_DEVICE;
+            case 0060000: // block special
+                return NET_SFTP_TYPE_BLOCK_DEVICE;
+            case 0140000: // socket
+                return NET_SFTP_TYPE_SOCKET;
+            case 0160000: // whiteout
+                // "SPECIAL should be used for files that are of
+                //  a known type which cannot be expressed in the protocol"
+                return NET_SFTP_TYPE_SPECIAL;
+            default:
+                return NET_SFTP_TYPE_UNKNOWN;
+        }
+    }
+
+    /**
+     * Parse Longname
+     *
+     * SFTPv3 doesn't provide any easy way of identifying a file type.  You could try to open
+     * a file as a directory and see if an error is returned or you could try to parse the
+     * SFTPv3-specific longname field of the SSH_FXP_NAME packet.  That's what this function does.
+     * The result is returned using the
+     * {@link http://tools.ietf.org/html/draft-ietf-secsh-filexfer-04#section-5.2 SFTPv4 type constants}.
+     *
+     * If the longname is in an unrecognized format bool(false) is returned.
+     *
+     * @param string $longname
+     * @return mixed
+     * @access private
+     */
+    function _parseLongname($longname)
+    {
+        // http://en.wikipedia.org/wiki/Unix_file_types
+        // http://en.wikipedia.org/wiki/Filesystem_permissions#Notation_of_traditional_Unix_permissions
+        if (preg_match('#^[^/]([r-][w-][xstST-]){3}#', $longname)) {
+            switch ($longname[0]) {
+                case '-':
+                    return NET_SFTP_TYPE_REGULAR;
+                case 'd':
+                    return NET_SFTP_TYPE_DIRECTORY;
+                case 'l':
+                    return NET_SFTP_TYPE_SYMLINK;
+                default:
+                    return NET_SFTP_TYPE_SPECIAL;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Sends SFTP Packets
+     *
+     * See '6. General Packet Format' of draft-ietf-secsh-filexfer-13 for more info.
+     *
+     * @param int $type
+     * @param string $data
+     * @see self::_get_sftp_packet()
+     * @see Net_SSH2::_send_channel_packet()
+     * @return bool
+     * @access private
+     */
+    function _send_sftp_packet($type, $data)
+    {
+        $packet = $this->request_id !== false ?
+            pack('NCNa*', strlen($data) + 5, $type, $this->request_id, $data) :
+            pack('NCa*', strlen($data) + 1, $type, $data);
+
+        $start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838
+        $result = $this->_send_channel_packet(NET_SFTP_CHANNEL, $packet);
+        $stop = strtok(microtime(), ' ') + strtok('');
+
+        if (defined('NET_SFTP_LOGGING')) {
+            $packet_type = '-> ' . $this->packet_types[$type] .
+                           ' (' . round($stop - $start, 4) . 's)';
+            if (NET_SFTP_LOGGING == NET_SFTP_LOG_REALTIME) {
+                echo "<pre>\r\n" . $this->_format_log(array($data), array($packet_type)) . "\r\n</pre>\r\n";
+                flush();
+                ob_flush();
+            } else {
+                $this->packet_type_log[] = $packet_type;
+                if (NET_SFTP_LOGGING == NET_SFTP_LOG_COMPLEX) {
+                    $this->packet_log[] = $data;
+                }
+            }
+        }
+
+        return $result;
+    }
+
+    /**
+     * Receives SFTP Packets
+     *
+     * See '6. General Packet Format' of draft-ietf-secsh-filexfer-13 for more info.
+     *
+     * Incidentally, the number of SSH_MSG_CHANNEL_DATA messages has no bearing on the number of SFTP packets present.
+     * There can be one SSH_MSG_CHANNEL_DATA messages containing two SFTP packets or there can be two SSH_MSG_CHANNEL_DATA
+     * messages containing one SFTP packet.
+     *
+     * @see self::_send_sftp_packet()
+     * @return string
+     * @access private
+     */
+    function _get_sftp_packet()
+    {
+        $this->curTimeout = false;
+
+        $start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838
+
+        // SFTP packet length
+        while (strlen($this->packet_buffer) < 4) {
+            $temp = $this->_get_channel_packet(NET_SFTP_CHANNEL, true);
+            if (is_bool($temp)) {
+                $this->packet_type = false;
+                $this->packet_buffer = '';
+                return false;
+            }
+            $this->packet_buffer.= $temp;
+        }
+        if (strlen($this->packet_buffer) < 4) {
+            return false;
+        }
+        extract(unpack('Nlength', $this->_string_shift($this->packet_buffer, 4)));
+        $tempLength = $length;
+        $tempLength-= strlen($this->packet_buffer);
+
+        // SFTP packet type and data payload
+        while ($tempLength > 0) {
+            $temp = $this->_get_channel_packet(NET_SFTP_CHANNEL, true);
+            if (is_bool($temp)) {
+                $this->packet_type = false;
+                $this->packet_buffer = '';
+                return false;
+            }
+            $this->packet_buffer.= $temp;
+            $tempLength-= strlen($temp);
+        }
+
+        $stop = strtok(microtime(), ' ') + strtok('');
+
+        $this->packet_type = ord($this->_string_shift($this->packet_buffer));
+
+        if ($this->request_id !== false) {
+            $this->_string_shift($this->packet_buffer, 4); // remove the request id
+            $length-= 5; // account for the request id and the packet type
+        } else {
+            $length-= 1; // account for the packet type
+        }
+
+        $packet = $this->_string_shift($this->packet_buffer, $length);
+
+        if (defined('NET_SFTP_LOGGING')) {
+            $packet_type = '<- ' . $this->packet_types[$this->packet_type] .
+                           ' (' . round($stop - $start, 4) . 's)';
+            if (NET_SFTP_LOGGING == NET_SFTP_LOG_REALTIME) {
+                echo "<pre>\r\n" . $this->_format_log(array($packet), array($packet_type)) . "\r\n</pre>\r\n";
+                flush();
+                ob_flush();
+            } else {
+                $this->packet_type_log[] = $packet_type;
+                if (NET_SFTP_LOGGING == NET_SFTP_LOG_COMPLEX) {
+                    $this->packet_log[] = $packet;
+                }
+            }
+        }
+
+        return $packet;
+    }
+
+    /**
+     * Returns a log of the packets that have been sent and received.
+     *
+     * Returns a string if NET_SFTP_LOGGING == NET_SFTP_LOG_COMPLEX, an array if NET_SFTP_LOGGING == NET_SFTP_LOG_SIMPLE and false if !defined('NET_SFTP_LOGGING')
+     *
+     * @access public
+     * @return string or Array
+     */
+    function getSFTPLog()
+    {
+        if (!defined('NET_SFTP_LOGGING')) {
+            return false;
+        }
+
+        switch (NET_SFTP_LOGGING) {
+            case NET_SFTP_LOG_COMPLEX:
+                return $this->_format_log($this->packet_log, $this->packet_type_log);
+                break;
+            //case NET_SFTP_LOG_SIMPLE:
+            default:
+                return $this->packet_type_log;
+        }
+    }
+
+    /**
+     * Returns all errors
+     *
+     * @return array
+     * @access public
+     */
+    function getSFTPErrors()
+    {
+        return $this->sftp_errors;
+    }
+
+    /**
+     * Returns the last error
+     *
+     * @return string
+     * @access public
+     */
+    function getLastSFTPError()
+    {
+        return count($this->sftp_errors) ? $this->sftp_errors[count($this->sftp_errors) - 1] : '';
+    }
+
+    /**
+     * Get supported SFTP versions
+     *
+     * @return array
+     * @access public
+     */
+    function getSupportedVersions()
+    {
+        $temp = array('version' => $this->version);
+        if (isset($this->extensions['versions'])) {
+            $temp['extensions'] = $this->extensions['versions'];
+        }
+        return $temp;
+    }
+
+    /**
+     * Disconnect
+     *
+     * @param int $reason
+     * @return bool
+     * @access private
+     */
+    function _disconnect($reason)
+    {
+        $this->pwd = false;
+        parent::_disconnect($reason);
+    }
+}
diff --git a/lib/php/phpseclib/Net/SFTP/Stream.php b/lib/php/phpseclib/Net/SFTP/Stream.php
new file mode 100644
index 00000000..5be48926
--- /dev/null
+++ b/lib/php/phpseclib/Net/SFTP/Stream.php
@@ -0,0 +1,815 @@
+<?php
+
+/**
+ * SFTP Stream Wrapper
+ *
+ * Creates an sftp:// protocol handler that can be used with, for example, fopen(), dir(), etc.
+ *
+ * PHP version 5
+ *
+ * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @category  Net
+ * @package   Net_SFTP_Stream
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2013 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+/**
+ * SFTP Stream Wrapper
+ *
+ * @package Net_SFTP_Stream
+ * @author  Jim Wigginton <terrafrost@php.net>
+ * @access  public
+ */
+class Net_SFTP_Stream
+{
+    /**
+     * SFTP instances
+     *
+     * Rather than re-create the connection we re-use instances if possible
+     *
+     * @var array
+     */
+    static $instances;
+
+    /**
+     * SFTP instance
+     *
+     * @var object
+     * @access private
+     */
+    var $sftp;
+
+    /**
+     * Path
+     *
+     * @var string
+     * @access private
+     */
+    var $path;
+
+    /**
+     * Mode
+     *
+     * @var string
+     * @access private
+     */
+    var $mode;
+
+    /**
+     * Position
+     *
+     * @var int
+     * @access private
+     */
+    var $pos;
+
+    /**
+     * Size
+     *
+     * @var int
+     * @access private
+     */
+    var $size;
+
+    /**
+     * Directory entries
+     *
+     * @var array
+     * @access private
+     */
+    var $entries;
+
+    /**
+     * EOF flag
+     *
+     * @var bool
+     * @access private
+     */
+    var $eof;
+
+    /**
+     * Context resource
+     *
+     * Technically this needs to be publically accessible so PHP can set it directly
+     *
+     * @var resource
+     * @access public
+     */
+    var $context;
+
+    /**
+     * Notification callback function
+     *
+     * @var callable
+     * @access public
+     */
+    var $notification;
+
+    /**
+     * Registers this class as a URL wrapper.
+     *
+     * @param string $protocol The wrapper name to be registered.
+     * @return bool True on success, false otherwise.
+     * @access public
+     */
+    static function register($protocol = 'sftp')
+    {
+        if (in_array($protocol, stream_get_wrappers(), true)) {
+            return false;
+        }
+        $class = function_exists('get_called_class') ? get_called_class() : __CLASS__;
+        return stream_wrapper_register($protocol, $class);
+    }
+
+    /**
+     * The Constructor
+     *
+     * @access public
+     */
+    function __construct()
+    {
+        if (defined('NET_SFTP_STREAM_LOGGING')) {
+            echo "__construct()\r\n";
+        }
+
+        if (!class_exists('Net_SFTP')) {
+            include_once 'Net/SFTP.php';
+        }
+    }
+
+    /**
+     * Path Parser
+     *
+     * Extract a path from a URI and actually connect to an SSH server if appropriate
+     *
+     * If "notification" is set as a context parameter the message code for successful login is
+     * NET_SSH2_MSG_USERAUTH_SUCCESS. For a failed login it's NET_SSH2_MSG_USERAUTH_FAILURE.
+     *
+     * @param string $path
+     * @return string
+     * @access private
+     */
+    function _parse_path($path)
+    {
+        $orig = $path;
+        extract(parse_url($path) + array('port' => 22));
+        if (isset($query)) {
+            $path.= '?' . $query;
+        } elseif (preg_match('/(\?|\?#)$/', $orig)) {
+            $path.= '?';
+        }
+        if (isset($fragment)) {
+            $path.= '#' . $fragment;
+        } elseif ($orig[strlen($orig) - 1] == '#') {
+            $path.= '#';
+        }
+
+        if (!isset($host)) {
+            return false;
+        }
+
+        if (isset($this->context)) {
+            $context = stream_context_get_params($this->context);
+            if (isset($context['notification'])) {
+                $this->notification = $context['notification'];
+            }
+        }
+
+        if ($host[0] == '$') {
+            $host = substr($host, 1);
+            global ${$host};
+            if (!is_object($$host) || get_class($$host) != 'Net_SFTP') {
+                return false;
+            }
+            $this->sftp = $$host;
+        } else {
+            if (isset($this->context)) {
+                $context = stream_context_get_options($this->context);
+            }
+            if (isset($context[$scheme]['session'])) {
+                $sftp = $context[$scheme]['session'];
+            }
+            if (isset($context[$scheme]['sftp'])) {
+                $sftp = $context[$scheme]['sftp'];
+            }
+            if (isset($sftp) && is_object($sftp) && get_class($sftp) == 'Net_SFTP') {
+                $this->sftp = $sftp;
+                return $path;
+            }
+            if (isset($context[$scheme]['username'])) {
+                $user = $context[$scheme]['username'];
+            }
+            if (isset($context[$scheme]['password'])) {
+                $pass = $context[$scheme]['password'];
+            }
+            if (isset($context[$scheme]['privkey']) && is_object($context[$scheme]['privkey']) && get_Class($context[$scheme]['privkey']) == 'Crypt_RSA') {
+                $pass = $context[$scheme]['privkey'];
+            }
+
+            if (!isset($user) || !isset($pass)) {
+                return false;
+            }
+
+            // casting $pass to a string is necessary in the event that it's a Crypt_RSA object
+            if (isset(self::$instances[$host][$port][$user][(string) $pass])) {
+                $this->sftp = self::$instances[$host][$port][$user][(string) $pass];
+            } else {
+                $this->sftp = new Net_SFTP($host, $port);
+                $this->sftp->disableStatCache();
+                if (isset($this->notification) && is_callable($this->notification)) {
+                    /* if !is_callable($this->notification) we could do this:
+
+                       user_error('fopen(): failed to call user notifier', E_USER_WARNING);
+
+                       the ftp wrapper gives errors like that when the notifier isn't callable.
+                       i've opted not to do that, however, since the ftp wrapper gives the line
+                       on which the fopen occurred as the line number - not the line that the
+                       user_error is on.
+                    */
+                    call_user_func($this->notification, STREAM_NOTIFY_CONNECT, STREAM_NOTIFY_SEVERITY_INFO, '', 0, 0, 0);
+                    call_user_func($this->notification, STREAM_NOTIFY_AUTH_REQUIRED, STREAM_NOTIFY_SEVERITY_INFO, '', 0, 0, 0);
+                    if (!$this->sftp->login($user, $pass)) {
+                        call_user_func($this->notification, STREAM_NOTIFY_AUTH_RESULT, STREAM_NOTIFY_SEVERITY_ERR, 'Login Failure', NET_SSH2_MSG_USERAUTH_FAILURE, 0, 0);
+                        return false;
+                    }
+                    call_user_func($this->notification, STREAM_NOTIFY_AUTH_RESULT, STREAM_NOTIFY_SEVERITY_INFO, 'Login Success', NET_SSH2_MSG_USERAUTH_SUCCESS, 0, 0);
+                } else {
+                    if (!$this->sftp->login($user, $pass)) {
+                        return false;
+                    }
+                }
+                self::$instances[$host][$port][$user][(string) $pass] = $this->sftp;
+            }
+        }
+
+        return $path;
+    }
+
+    /**
+     * Opens file or URL
+     *
+     * @param string $path
+     * @param string $mode
+     * @param int $options
+     * @param string $opened_path
+     * @return bool
+     * @access public
+     */
+    function _stream_open($path, $mode, $options, &$opened_path)
+    {
+        $path = $this->_parse_path($path);
+
+        if ($path === false) {
+            return false;
+        }
+        $this->path = $path;
+
+        $this->size = $this->sftp->size($path);
+        $this->mode = preg_replace('#[bt]$#', '', $mode);
+        $this->eof = false;
+
+        if ($this->size === false) {
+            if ($this->mode[0] == 'r') {
+                return false;
+            } else {
+                $this->sftp->touch($path);
+                $this->size = 0;
+            }
+        } else {
+            switch ($this->mode[0]) {
+                case 'x':
+                    return false;
+                case 'w':
+                    $this->sftp->truncate($path, 0);
+                    $this->size = 0;
+            }
+        }
+
+        $this->pos = $this->mode[0] != 'a' ? 0 : $this->size;
+
+        return true;
+    }
+
+    /**
+     * Read from stream
+     *
+     * @param int $count
+     * @return mixed
+     * @access public
+     */
+    function _stream_read($count)
+    {
+        switch ($this->mode) {
+            case 'w':
+            case 'a':
+            case 'x':
+            case 'c':
+                return false;
+        }
+
+        // commented out because some files - eg. /dev/urandom - will say their size is 0 when in fact it's kinda infinite
+        //if ($this->pos >= $this->size) {
+        //    $this->eof = true;
+        //    return false;
+        //}
+
+        $result = $this->sftp->get($this->path, false, $this->pos, $count);
+        if (isset($this->notification) && is_callable($this->notification)) {
+            if ($result === false) {
+                call_user_func($this->notification, STREAM_NOTIFY_FAILURE, STREAM_NOTIFY_SEVERITY_ERR, $this->sftp->getLastSFTPError(), NET_SFTP_OPEN, 0, 0);
+                return 0;
+            }
+            // seems that PHP calls stream_read in 8k chunks
+            call_user_func($this->notification, STREAM_NOTIFY_PROGRESS, STREAM_NOTIFY_SEVERITY_INFO, '', 0, strlen($result), $this->size);
+        }
+
+        if (empty($result)) { // ie. false or empty string
+            $this->eof = true;
+            return false;
+        }
+        $this->pos+= strlen($result);
+
+        return $result;
+    }
+
+    /**
+     * Write to stream
+     *
+     * @param string $data
+     * @return mixed
+     * @access public
+     */
+    function _stream_write($data)
+    {
+        switch ($this->mode) {
+            case 'r':
+                return false;
+        }
+
+        $result = $this->sftp->put($this->path, $data, NET_SFTP_STRING, $this->pos);
+        if (isset($this->notification) && is_callable($this->notification)) {
+            if (!$result) {
+                call_user_func($this->notification, STREAM_NOTIFY_FAILURE, STREAM_NOTIFY_SEVERITY_ERR, $this->sftp->getLastSFTPError(), NET_SFTP_OPEN, 0, 0);
+                return 0;
+            }
+            // seems that PHP splits up strings into 8k blocks before calling stream_write
+            call_user_func($this->notification, STREAM_NOTIFY_PROGRESS, STREAM_NOTIFY_SEVERITY_INFO, '', 0, strlen($data), strlen($data));
+        }
+
+        if ($result === false) {
+            return false;
+        }
+        $this->pos+= strlen($data);
+        if ($this->pos > $this->size) {
+            $this->size = $this->pos;
+        }
+        $this->eof = false;
+        return strlen($data);
+    }
+
+    /**
+     * Retrieve the current position of a stream
+     *
+     * @return int
+     * @access public
+     */
+    function _stream_tell()
+    {
+        return $this->pos;
+    }
+
+    /**
+     * Tests for end-of-file on a file pointer
+     *
+     * In my testing there are four classes functions that normally effect the pointer:
+     * fseek, fputs  / fwrite, fgets / fread and ftruncate.
+     *
+     * Only fgets / fread, however, results in feof() returning true. do fputs($fp, 'aaa') on a blank file and feof()
+     * will return false. do fread($fp, 1) and feof() will then return true. do fseek($fp, 10) on ablank file and feof()
+     * will return false. do fread($fp, 1) and feof() will then return true.
+     *
+     * @return bool
+     * @access public
+     */
+    function _stream_eof()
+    {
+        return $this->eof;
+    }
+
+    /**
+     * Seeks to specific location in a stream
+     *
+     * @param int $offset
+     * @param int $whence
+     * @return bool
+     * @access public
+     */
+    function _stream_seek($offset, $whence)
+    {
+        switch ($whence) {
+            case SEEK_SET:
+                if ($offset >= $this->size || $offset < 0) {
+                    return false;
+                }
+                break;
+            case SEEK_CUR:
+                $offset+= $this->pos;
+                break;
+            case SEEK_END:
+                $offset+= $this->size;
+        }
+
+        $this->pos = $offset;
+        $this->eof = false;
+        return true;
+    }
+
+    /**
+     * Change stream options
+     *
+     * @param string $path
+     * @param int $option
+     * @param mixed $var
+     * @return bool
+     * @access public
+     */
+    function _stream_metadata($path, $option, $var)
+    {
+        $path = $this->_parse_path($path);
+        if ($path === false) {
+            return false;
+        }
+
+        // stream_metadata was introduced in PHP 5.4.0 but as of 5.4.11 the constants haven't been defined
+        // see http://www.php.net/streamwrapper.stream-metadata and https://bugs.php.net/64246
+        //     and https://github.com/php/php-src/blob/master/main/php_streams.h#L592
+        switch ($option) {
+            case 1: // PHP_STREAM_META_TOUCH
+                return $this->sftp->touch($path, $var[0], $var[1]);
+            case 2: // PHP_STREAM_OWNER_NAME
+            case 3: // PHP_STREAM_GROUP_NAME
+                return false;
+            case 4: // PHP_STREAM_META_OWNER
+                return $this->sftp->chown($path, $var);
+            case 5: // PHP_STREAM_META_GROUP
+                return $this->sftp->chgrp($path, $var);
+            case 6: // PHP_STREAM_META_ACCESS
+                return $this->sftp->chmod($path, $var) !== false;
+        }
+    }
+
+    /**
+     * Retrieve the underlaying resource
+     *
+     * @param int $cast_as
+     * @return resource
+     * @access public
+     */
+    function _stream_cast($cast_as)
+    {
+        return $this->sftp->fsock;
+    }
+
+    /**
+     * Advisory file locking
+     *
+     * @param int $operation
+     * @return bool
+     * @access public
+     */
+    function _stream_lock($operation)
+    {
+        return false;
+    }
+
+    /**
+     * Renames a file or directory
+     *
+     * Attempts to rename oldname to newname, moving it between directories if necessary.
+     * If newname exists, it will be overwritten.  This is a departure from what Net_SFTP
+     * does.
+     *
+     * @param string $path_from
+     * @param string $path_to
+     * @return bool
+     * @access public
+     */
+    function _rename($path_from, $path_to)
+    {
+        $path1 = parse_url($path_from);
+        $path2 = parse_url($path_to);
+        unset($path1['path'], $path2['path']);
+        if ($path1 != $path2) {
+            return false;
+        }
+
+        $path_from = $this->_parse_path($path_from);
+        $path_to = parse_url($path_to);
+        if ($path_from === false) {
+            return false;
+        }
+
+        $path_to = $path_to['path']; // the $component part of parse_url() was added in PHP 5.1.2
+        // "It is an error if there already exists a file with the name specified by newpath."
+        //  -- http://tools.ietf.org/html/draft-ietf-secsh-filexfer-02#section-6.5
+        if (!$this->sftp->rename($path_from, $path_to)) {
+            if ($this->sftp->stat($path_to)) {
+                return $this->sftp->delete($path_to, true) && $this->sftp->rename($path_from, $path_to);
+            }
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * Open directory handle
+     *
+     * The only $options is "whether or not to enforce safe_mode (0x04)". Since safe mode was deprecated in 5.3 and
+     * removed in 5.4 I'm just going to ignore it.
+     *
+     * Also, nlist() is the best that this function is realistically going to be able to do. When an SFTP client
+     * sends a SSH_FXP_READDIR packet you don't generally get info on just one file but on multiple files. Quoting
+     * the SFTP specs:
+     *
+     *    The SSH_FXP_NAME response has the following format:
+     *
+     *        uint32     id
+     *        uint32     count
+     *        repeats count times:
+     *                string     filename
+     *                string     longname
+     *                ATTRS      attrs
+     *
+     * @param string $path
+     * @param int $options
+     * @return bool
+     * @access public
+     */
+    function _dir_opendir($path, $options)
+    {
+        $path = $this->_parse_path($path);
+        if ($path === false) {
+            return false;
+        }
+        $this->pos = 0;
+        $this->entries = $this->sftp->nlist($path);
+        return $this->entries !== false;
+    }
+
+    /**
+     * Read entry from directory handle
+     *
+     * @return mixed
+     * @access public
+     */
+    function _dir_readdir()
+    {
+        if (isset($this->entries[$this->pos])) {
+            return $this->entries[$this->pos++];
+        }
+        return false;
+    }
+
+    /**
+     * Rewind directory handle
+     *
+     * @return bool
+     * @access public
+     */
+    function _dir_rewinddir()
+    {
+        $this->pos = 0;
+        return true;
+    }
+
+    /**
+     * Close directory handle
+     *
+     * @return bool
+     * @access public
+     */
+    function _dir_closedir()
+    {
+        return true;
+    }
+
+    /**
+     * Create a directory
+     *
+     * Only valid $options is STREAM_MKDIR_RECURSIVE
+     *
+     * @param string $path
+     * @param int $mode
+     * @param int $options
+     * @return bool
+     * @access public
+     */
+    function _mkdir($path, $mode, $options)
+    {
+        $path = $this->_parse_path($path);
+        if ($path === false) {
+            return false;
+        }
+
+        return $this->sftp->mkdir($path, $mode, $options & STREAM_MKDIR_RECURSIVE);
+    }
+
+    /**
+     * Removes a directory
+     *
+     * Only valid $options is STREAM_MKDIR_RECURSIVE per <http://php.net/streamwrapper.rmdir>, however,
+     * <http://php.net/rmdir>  does not have a $recursive parameter as mkdir() does so I don't know how
+     * STREAM_MKDIR_RECURSIVE is supposed to be set. Also, when I try it out with rmdir() I get 8 as
+     * $options. What does 8 correspond to?
+     *
+     * @param string $path
+     * @param int $mode
+     * @param int $options
+     * @return bool
+     * @access public
+     */
+    function _rmdir($path, $options)
+    {
+        $path = $this->_parse_path($path);
+        if ($path === false) {
+            return false;
+        }
+
+        return $this->sftp->rmdir($path);
+    }
+
+    /**
+     * Flushes the output
+     *
+     * See <http://php.net/fflush>. Always returns true because Net_SFTP doesn't cache stuff before writing
+     *
+     * @return bool
+     * @access public
+     */
+    function _stream_flush()
+    {
+        return true;
+    }
+
+    /**
+     * Retrieve information about a file resource
+     *
+     * @return mixed
+     * @access public
+     */
+    function _stream_stat()
+    {
+        $results = $this->sftp->stat($this->path);
+        if ($results === false) {
+            return false;
+        }
+        return $results;
+    }
+
+    /**
+     * Delete a file
+     *
+     * @param string $path
+     * @return bool
+     * @access public
+     */
+    function _unlink($path)
+    {
+        $path = $this->_parse_path($path);
+        if ($path === false) {
+            return false;
+        }
+
+        return $this->sftp->delete($path, false);
+    }
+
+    /**
+     * Retrieve information about a file
+     *
+     * Ignores the STREAM_URL_STAT_QUIET flag because the entirety of Net_SFTP_Stream is quiet by default
+     * might be worthwhile to reconstruct bits 12-16 (ie. the file type) if mode doesn't have them but we'll
+     * cross that bridge when and if it's reached
+     *
+     * @param string $path
+     * @param int $flags
+     * @return mixed
+     * @access public
+     */
+    function _url_stat($path, $flags)
+    {
+        $path = $this->_parse_path($path);
+        if ($path === false) {
+            return false;
+        }
+
+        $results = $flags & STREAM_URL_STAT_LINK ? $this->sftp->lstat($path) : $this->sftp->stat($path);
+        if ($results === false) {
+            return false;
+        }
+
+        return $results;
+    }
+
+    /**
+     * Truncate stream
+     *
+     * @param int $new_size
+     * @return bool
+     * @access public
+     */
+    function _stream_truncate($new_size)
+    {
+        if (!$this->sftp->truncate($this->path, $new_size)) {
+            return false;
+        }
+
+        $this->eof = false;
+        $this->size = $new_size;
+
+        return true;
+    }
+
+    /**
+     * Change stream options
+     *
+     * STREAM_OPTION_WRITE_BUFFER isn't supported for the same reason stream_flush isn't.
+     * The other two aren't supported because of limitations in Net_SFTP.
+     *
+     * @param int $option
+     * @param int $arg1
+     * @param int $arg2
+     * @return bool
+     * @access public
+     */
+    function _stream_set_option($option, $arg1, $arg2)
+    {
+        return false;
+    }
+
+    /**
+     * Close an resource
+     *
+     * @access public
+     */
+    function _stream_close()
+    {
+    }
+
+    /**
+     * __call Magic Method
+     *
+     * When you're utilizing an SFTP stream you're not calling the methods in this class directly - PHP is calling them for you.
+     * Which kinda begs the question... what methods is PHP calling and what parameters is it passing to them? This function
+     * lets you figure that out.
+     *
+     * If NET_SFTP_STREAM_LOGGING is defined all calls will be output on the screen and then (regardless of whether or not
+     * NET_SFTP_STREAM_LOGGING is enabled) the parameters will be passed through to the appropriate method.
+     *
+     * @param string
+     * @param array
+     * @return mixed
+     * @access public
+     */
+    function __call($name, $arguments)
+    {
+        if (defined('NET_SFTP_STREAM_LOGGING')) {
+            echo $name . '(';
+            $last = count($arguments) - 1;
+            foreach ($arguments as $i => $argument) {
+                var_export($argument);
+                if ($i != $last) {
+                    echo ',';
+                }
+            }
+            echo ")\r\n";
+        }
+        $name = '_' . $name;
+        if (!method_exists($this, $name)) {
+            return false;
+        }
+        return call_user_func_array(array($this, $name), $arguments);
+    }
+}
+
+Net_SFTP_Stream::register();
diff --git a/lib/php/phpseclib/Net/SSH1.php b/lib/php/phpseclib/Net/SSH1.php
new file mode 100644
index 00000000..702d140b
--- /dev/null
+++ b/lib/php/phpseclib/Net/SSH1.php
@@ -0,0 +1,1691 @@
+<?php
+
+/**
+ * Pure-PHP implementation of SSHv1.
+ *
+ * PHP versions 4 and 5
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ *    include 'Net/SSH1.php';
+ *
+ *    $ssh = new Net_SSH1('www.domain.tld');
+ *    if (!$ssh->login('username', 'password')) {
+ *        exit('Login Failed');
+ *    }
+ *
+ *    echo $ssh->exec('ls -la');
+ * ?>
+ * </code>
+ *
+ * Here's another short example:
+ * <code>
+ * <?php
+ *    include 'Net/SSH1.php';
+ *
+ *    $ssh = new Net_SSH1('www.domain.tld');
+ *    if (!$ssh->login('username', 'password')) {
+ *        exit('Login Failed');
+ *    }
+ *
+ *    echo $ssh->read('username@username:~$');
+ *    $ssh->write("ls -la\n");
+ *    echo $ssh->read('username@username:~$');
+ * ?>
+ * </code>
+ *
+ * More information on the SSHv1 specification can be found by reading
+ * {@link http://www.snailbook.com/docs/protocol-1.5.txt protocol-1.5.txt}.
+ *
+ * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @category  Net
+ * @package   Net_SSH1
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2007 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+/**#@+
+ * Encryption Methods
+ *
+ * @see self::getSupportedCiphers()
+ * @access public
+ */
+/**
+ * No encryption
+ *
+ * Not supported.
+ */
+define('NET_SSH1_CIPHER_NONE',       0);
+/**
+ * IDEA in CFB mode
+ *
+ * Not supported.
+ */
+define('NET_SSH1_CIPHER_IDEA',       1);
+/**
+ * DES in CBC mode
+ */
+define('NET_SSH1_CIPHER_DES',        2);
+/**
+ * Triple-DES in CBC mode
+ *
+ * All implementations are required to support this
+ */
+define('NET_SSH1_CIPHER_3DES',       3);
+/**
+ * TRI's Simple Stream encryption CBC
+ *
+ * Not supported nor is it defined in the official SSH1 specs.  OpenSSH, however, does define it (see cipher.h),
+ * although it doesn't use it (see cipher.c)
+ */
+define('NET_SSH1_CIPHER_BROKEN_TSS', 4);
+/**
+ * RC4
+ *
+ * Not supported.
+ *
+ * @internal According to the SSH1 specs:
+ *
+ *        "The first 16 bytes of the session key are used as the key for
+ *         the server to client direction.  The remaining 16 bytes are used
+ *         as the key for the client to server direction.  This gives
+ *         independent 128-bit keys for each direction."
+ *
+ *     This library currently only supports encryption when the same key is being used for both directions.  This is
+ *     because there's only one $crypto object.  Two could be added ($encrypt and $decrypt, perhaps).
+ */
+define('NET_SSH1_CIPHER_RC4',        5);
+/**
+ * Blowfish
+ *
+ * Not supported nor is it defined in the official SSH1 specs.  OpenSSH, however, defines it (see cipher.h) and
+ * uses it (see cipher.c)
+ */
+define('NET_SSH1_CIPHER_BLOWFISH',   6);
+/**#@-*/
+
+/**#@+
+ * Authentication Methods
+ *
+ * @see self::getSupportedAuthentications()
+ * @access public
+ */
+/**
+ * .rhosts or /etc/hosts.equiv
+ */
+define('NET_SSH1_AUTH_RHOSTS',     1);
+/**
+ * pure RSA authentication
+ */
+define('NET_SSH1_AUTH_RSA',        2);
+/**
+ * password authentication
+ *
+ * This is the only method that is supported by this library.
+ */
+define('NET_SSH1_AUTH_PASSWORD',   3);
+/**
+ * .rhosts with RSA host authentication
+ */
+define('NET_SSH1_AUTH_RHOSTS_RSA', 4);
+/**#@-*/
+
+/**#@+
+ * Terminal Modes
+ *
+ * @link http://3sp.com/content/developer/maverick-net/docs/Maverick.SSH.PseudoTerminalModesMembers.html
+ * @access private
+ */
+define('NET_SSH1_TTY_OP_END',  0);
+/**#@-*/
+
+/**
+ * The Response Type
+ *
+ * @see self::_get_binary_packet()
+ * @access private
+ */
+define('NET_SSH1_RESPONSE_TYPE', 1);
+
+/**
+ * The Response Data
+ *
+ * @see self::_get_binary_packet()
+ * @access private
+ */
+define('NET_SSH1_RESPONSE_DATA', 2);
+
+/**#@+
+ * Execution Bitmap Masks
+ *
+ * @see self::bitmap
+ * @access private
+ */
+define('NET_SSH1_MASK_CONSTRUCTOR', 0x00000001);
+define('NET_SSH1_MASK_CONNECTED',   0x00000002);
+define('NET_SSH1_MASK_LOGIN',       0x00000004);
+define('NET_SSH1_MASK_SHELL',       0x00000008);
+/**#@-*/
+
+/**#@+
+ * @access public
+ * @see self::getLog()
+ */
+/**
+ * Returns the message numbers
+ */
+define('NET_SSH1_LOG_SIMPLE',  1);
+/**
+ * Returns the message content
+ */
+define('NET_SSH1_LOG_COMPLEX', 2);
+/**
+ * Outputs the content real-time
+ */
+define('NET_SSH1_LOG_REALTIME', 3);
+/**
+ * Dumps the content real-time to a file
+ */
+define('NET_SSH1_LOG_REALTIME_FILE', 4);
+/**#@-*/
+
+/**#@+
+ * @access public
+ * @see self::read()
+ */
+/**
+ * Returns when a string matching $expect exactly is found
+ */
+define('NET_SSH1_READ_SIMPLE',  1);
+/**
+ * Returns when a string matching the regular expression $expect is found
+ */
+define('NET_SSH1_READ_REGEX', 2);
+/**#@-*/
+
+/**
+ * Pure-PHP implementation of SSHv1.
+ *
+ * @package Net_SSH1
+ * @author  Jim Wigginton <terrafrost@php.net>
+ * @access  public
+ */
+class Net_SSH1
+{
+    /**
+     * The SSH identifier
+     *
+     * @var string
+     * @access private
+     */
+    var $identifier = 'SSH-1.5-phpseclib';
+
+    /**
+     * The Socket Object
+     *
+     * @var object
+     * @access private
+     */
+    var $fsock;
+
+    /**
+     * The cryptography object
+     *
+     * @var object
+     * @access private
+     */
+    var $crypto = false;
+
+    /**
+     * Execution Bitmap
+     *
+     * The bits that are set represent functions that have been called already.  This is used to determine
+     * if a requisite function has been successfully executed.  If not, an error should be thrown.
+     *
+     * @var int
+     * @access private
+     */
+    var $bitmap = 0;
+
+    /**
+     * The Server Key Public Exponent
+     *
+     * Logged for debug purposes
+     *
+     * @see self::getServerKeyPublicExponent()
+     * @var string
+     * @access private
+     */
+    var $server_key_public_exponent;
+
+    /**
+     * The Server Key Public Modulus
+     *
+     * Logged for debug purposes
+     *
+     * @see self::getServerKeyPublicModulus()
+     * @var string
+     * @access private
+     */
+    var $server_key_public_modulus;
+
+    /**
+     * The Host Key Public Exponent
+     *
+     * Logged for debug purposes
+     *
+     * @see self::getHostKeyPublicExponent()
+     * @var string
+     * @access private
+     */
+    var $host_key_public_exponent;
+
+    /**
+     * The Host Key Public Modulus
+     *
+     * Logged for debug purposes
+     *
+     * @see self::getHostKeyPublicModulus()
+     * @var string
+     * @access private
+     */
+    var $host_key_public_modulus;
+
+    /**
+     * Supported Ciphers
+     *
+     * Logged for debug purposes
+     *
+     * @see self::getSupportedCiphers()
+     * @var array
+     * @access private
+     */
+    var $supported_ciphers = array(
+        NET_SSH1_CIPHER_NONE       => 'No encryption',
+        NET_SSH1_CIPHER_IDEA       => 'IDEA in CFB mode',
+        NET_SSH1_CIPHER_DES        => 'DES in CBC mode',
+        NET_SSH1_CIPHER_3DES       => 'Triple-DES in CBC mode',
+        NET_SSH1_CIPHER_BROKEN_TSS => 'TRI\'s Simple Stream encryption CBC',
+        NET_SSH1_CIPHER_RC4        => 'RC4',
+        NET_SSH1_CIPHER_BLOWFISH   => 'Blowfish'
+    );
+
+    /**
+     * Supported Authentications
+     *
+     * Logged for debug purposes
+     *
+     * @see self::getSupportedAuthentications()
+     * @var array
+     * @access private
+     */
+    var $supported_authentications = array(
+        NET_SSH1_AUTH_RHOSTS     => '.rhosts or /etc/hosts.equiv',
+        NET_SSH1_AUTH_RSA        => 'pure RSA authentication',
+        NET_SSH1_AUTH_PASSWORD   => 'password authentication',
+        NET_SSH1_AUTH_RHOSTS_RSA => '.rhosts with RSA host authentication'
+    );
+
+    /**
+     * Server Identification
+     *
+     * @see self::getServerIdentification()
+     * @var string
+     * @access private
+     */
+    var $server_identification = '';
+
+    /**
+     * Protocol Flags
+     *
+     * @see self::Net_SSH1()
+     * @var array
+     * @access private
+     */
+    var $protocol_flags = array();
+
+    /**
+     * Protocol Flag Log
+     *
+     * @see self::getLog()
+     * @var array
+     * @access private
+     */
+    var $protocol_flag_log = array();
+
+    /**
+     * Message Log
+     *
+     * @see self::getLog()
+     * @var array
+     * @access private
+     */
+    var $message_log = array();
+
+    /**
+     * Real-time log file pointer
+     *
+     * @see self::_append_log()
+     * @var resource
+     * @access private
+     */
+    var $realtime_log_file;
+
+    /**
+     * Real-time log file size
+     *
+     * @see self::_append_log()
+     * @var int
+     * @access private
+     */
+    var $realtime_log_size;
+
+    /**
+     * Real-time log file wrap boolean
+     *
+     * @see self::_append_log()
+     * @var bool
+     * @access private
+     */
+    var $realtime_log_wrap;
+
+    /**
+     * Interactive Buffer
+     *
+     * @see self::read()
+     * @var array
+     * @access private
+     */
+    var $interactiveBuffer = '';
+
+    /**
+     * Timeout
+     *
+     * @see self::setTimeout()
+     * @access private
+     */
+    var $timeout;
+
+    /**
+     * Current Timeout
+     *
+     * @see self::_get_channel_packet()
+     * @access private
+     */
+    var $curTimeout;
+
+    /**
+     * Log Boundary
+     *
+     * @see self::_format_log()
+     * @access private
+     */
+    var $log_boundary = ':';
+
+    /**
+     * Log Long Width
+     *
+     * @see self::_format_log()
+     * @access private
+     */
+    var $log_long_width = 65;
+
+    /**
+     * Log Short Width
+     *
+     * @see self::_format_log()
+     * @access private
+     */
+    var $log_short_width = 16;
+
+    /**
+     * Hostname
+     *
+     * @see self::Net_SSH1()
+     * @see self::_connect()
+     * @var string
+     * @access private
+     */
+    var $host;
+
+    /**
+     * Port Number
+     *
+     * @see self::Net_SSH1()
+     * @see self::_connect()
+     * @var int
+     * @access private
+     */
+    var $port;
+
+    /**
+     * Timeout for initial connection
+     *
+     * Set by the constructor call. Calling setTimeout() is optional. If it's not called functions like
+     * exec() won't timeout unless some PHP setting forces it too. The timeout specified in the constructor,
+     * however, is non-optional. There will be a timeout, whether or not you set it. If you don't it'll be
+     * 10 seconds. It is used by fsockopen() in that function.
+     *
+     * @see self::Net_SSH1()
+     * @see self::_connect()
+     * @var int
+     * @access private
+     */
+    var $connectionTimeout;
+
+    /**
+     * Default cipher
+     *
+     * @see self::Net_SSH1()
+     * @see self::_connect()
+     * @var int
+     * @access private
+     */
+    var $cipher;
+
+    /**
+     * Default Constructor.
+     *
+     * Connects to an SSHv1 server
+     *
+     * @param string $host
+     * @param int $port
+     * @param int $timeout
+     * @param int $cipher
+     * @return Net_SSH1
+     * @access public
+     */
+    function __construct($host, $port = 22, $timeout = 10, $cipher = NET_SSH1_CIPHER_3DES)
+    {
+        if (!class_exists('Math_BigInteger')) {
+            include_once 'Math/BigInteger.php';
+        }
+
+        // Include Crypt_Random
+        // the class_exists() will only be called if the crypt_random_string function hasn't been defined and
+        // will trigger a call to __autoload() if you're wanting to auto-load classes
+        // call function_exists() a second time to stop the include_once from being called outside
+        // of the auto loader
+        if (!function_exists('crypt_random_string') && !class_exists('Crypt_Random') && !function_exists('crypt_random_string')) {
+            include_once 'Crypt/Random.php';
+        }
+
+        $this->protocol_flags = array(
+            1  => 'NET_SSH1_MSG_DISCONNECT',
+            2  => 'NET_SSH1_SMSG_PUBLIC_KEY',
+            3  => 'NET_SSH1_CMSG_SESSION_KEY',
+            4  => 'NET_SSH1_CMSG_USER',
+            9  => 'NET_SSH1_CMSG_AUTH_PASSWORD',
+            10 => 'NET_SSH1_CMSG_REQUEST_PTY',
+            12 => 'NET_SSH1_CMSG_EXEC_SHELL',
+            13 => 'NET_SSH1_CMSG_EXEC_CMD',
+            14 => 'NET_SSH1_SMSG_SUCCESS',
+            15 => 'NET_SSH1_SMSG_FAILURE',
+            16 => 'NET_SSH1_CMSG_STDIN_DATA',
+            17 => 'NET_SSH1_SMSG_STDOUT_DATA',
+            18 => 'NET_SSH1_SMSG_STDERR_DATA',
+            19 => 'NET_SSH1_CMSG_EOF',
+            20 => 'NET_SSH1_SMSG_EXITSTATUS',
+            33 => 'NET_SSH1_CMSG_EXIT_CONFIRMATION'
+        );
+
+        $this->_define_array($this->protocol_flags);
+
+        $this->host = $host;
+        $this->port = $port;
+        $this->connectionTimeout = $timeout;
+        $this->cipher = $cipher;
+    }
+
+    /**
+     * PHP4 compatible Default Constructor.
+     *
+     * @see self::__construct()
+     * @param string $host
+     * @param int $port
+     * @param int $timeout
+     * @param int $cipher
+     * @access public
+     */
+    function Net_SSH1($host, $port = 22, $timeout = 10, $cipher = NET_SSH1_CIPHER_3DES)
+    {
+        $this->__construct($host, $port, $timeout, $cipher);
+    }
+
+    /**
+     * Connect to an SSHv1 server
+     *
+     * @return bool
+     * @access private
+     */
+    function _connect()
+    {
+        $this->fsock = @fsockopen($this->host, $this->port, $errno, $errstr, $this->connectionTimeout);
+        if (!$this->fsock) {
+            user_error(rtrim("Cannot connect to {$this->host}:{$this->port}. Error $errno. $errstr"));
+            return false;
+        }
+
+        $this->server_identification = $init_line = fgets($this->fsock, 255);
+
+        if (defined('NET_SSH1_LOGGING')) {
+            $this->_append_log('<-', $this->server_identification);
+            $this->_append_log('->', $this->identifier . "\r\n");
+        }
+
+        if (!preg_match('#SSH-([0-9\.]+)-(.+)#', $init_line, $parts)) {
+            user_error('Can only connect to SSH servers');
+            return false;
+        }
+        if ($parts[1][0] != 1) {
+            user_error("Cannot connect to SSH $parts[1] servers");
+            return false;
+        }
+
+        fputs($this->fsock, $this->identifier."\r\n");
+
+        $response = $this->_get_binary_packet();
+        if ($response[NET_SSH1_RESPONSE_TYPE] != NET_SSH1_SMSG_PUBLIC_KEY) {
+            user_error('Expected SSH_SMSG_PUBLIC_KEY');
+            return false;
+        }
+
+        $anti_spoofing_cookie = $this->_string_shift($response[NET_SSH1_RESPONSE_DATA], 8);
+
+        $this->_string_shift($response[NET_SSH1_RESPONSE_DATA], 4);
+
+        if (strlen($response[NET_SSH1_RESPONSE_DATA]) < 2) {
+            return false;
+        }
+        $temp = unpack('nlen', $this->_string_shift($response[NET_SSH1_RESPONSE_DATA], 2));
+        $server_key_public_exponent = new Math_BigInteger($this->_string_shift($response[NET_SSH1_RESPONSE_DATA], ceil($temp['len'] / 8)), 256);
+        $this->server_key_public_exponent = $server_key_public_exponent;
+
+        if (strlen($response[NET_SSH1_RESPONSE_DATA]) < 2) {
+            return false;
+        }
+        $temp = unpack('nlen', $this->_string_shift($response[NET_SSH1_RESPONSE_DATA], 2));
+        $server_key_public_modulus = new Math_BigInteger($this->_string_shift($response[NET_SSH1_RESPONSE_DATA], ceil($temp['len'] / 8)), 256);
+        $this->server_key_public_modulus = $server_key_public_modulus;
+
+        $this->_string_shift($response[NET_SSH1_RESPONSE_DATA], 4);
+
+        if (strlen($response[NET_SSH1_RESPONSE_DATA]) < 2) {
+            return false;
+        }
+        $temp = unpack('nlen', $this->_string_shift($response[NET_SSH1_RESPONSE_DATA], 2));
+        $host_key_public_exponent = new Math_BigInteger($this->_string_shift($response[NET_SSH1_RESPONSE_DATA], ceil($temp['len'] / 8)), 256);
+        $this->host_key_public_exponent = $host_key_public_exponent;
+
+        if (strlen($response[NET_SSH1_RESPONSE_DATA]) < 2) {
+            return false;
+        }
+        $temp = unpack('nlen', $this->_string_shift($response[NET_SSH1_RESPONSE_DATA], 2));
+        $host_key_public_modulus = new Math_BigInteger($this->_string_shift($response[NET_SSH1_RESPONSE_DATA], ceil($temp['len'] / 8)), 256);
+        $this->host_key_public_modulus = $host_key_public_modulus;
+
+        $this->_string_shift($response[NET_SSH1_RESPONSE_DATA], 4);
+
+        // get a list of the supported ciphers
+        if (strlen($response[NET_SSH1_RESPONSE_DATA]) < 4) {
+            return false;
+        }
+        extract(unpack('Nsupported_ciphers_mask', $this->_string_shift($response[NET_SSH1_RESPONSE_DATA], 4)));
+        foreach ($this->supported_ciphers as $mask => $name) {
+            if (($supported_ciphers_mask & (1 << $mask)) == 0) {
+                unset($this->supported_ciphers[$mask]);
+            }
+        }
+
+        // get a list of the supported authentications
+        if (strlen($response[NET_SSH1_RESPONSE_DATA]) < 4) {
+            return false;
+        }
+        extract(unpack('Nsupported_authentications_mask', $this->_string_shift($response[NET_SSH1_RESPONSE_DATA], 4)));
+        foreach ($this->supported_authentications as $mask => $name) {
+            if (($supported_authentications_mask & (1 << $mask)) == 0) {
+                unset($this->supported_authentications[$mask]);
+            }
+        }
+
+        $session_id = pack('H*', md5($host_key_public_modulus->toBytes() . $server_key_public_modulus->toBytes() . $anti_spoofing_cookie));
+
+        $session_key = crypt_random_string(32);
+        $double_encrypted_session_key = $session_key ^ str_pad($session_id, 32, chr(0));
+
+        if ($server_key_public_modulus->compare($host_key_public_modulus) < 0) {
+            $double_encrypted_session_key = $this->_rsa_crypt(
+                $double_encrypted_session_key,
+                array(
+                    $server_key_public_exponent,
+                    $server_key_public_modulus
+                )
+            );
+            $double_encrypted_session_key = $this->_rsa_crypt(
+                $double_encrypted_session_key,
+                array(
+                    $host_key_public_exponent,
+                    $host_key_public_modulus
+                )
+            );
+        } else {
+            $double_encrypted_session_key = $this->_rsa_crypt(
+                $double_encrypted_session_key,
+                array(
+                    $host_key_public_exponent,
+                    $host_key_public_modulus
+                )
+            );
+            $double_encrypted_session_key = $this->_rsa_crypt(
+                $double_encrypted_session_key,
+                array(
+                    $server_key_public_exponent,
+                    $server_key_public_modulus
+                )
+            );
+        }
+
+        $cipher = isset($this->supported_ciphers[$this->cipher]) ? $this->cipher : NET_SSH1_CIPHER_3DES;
+        $data = pack('C2a*na*N', NET_SSH1_CMSG_SESSION_KEY, $cipher, $anti_spoofing_cookie, 8 * strlen($double_encrypted_session_key), $double_encrypted_session_key, 0);
+
+        if (!$this->_send_binary_packet($data)) {
+            user_error('Error sending SSH_CMSG_SESSION_KEY');
+            return false;
+        }
+
+        switch ($cipher) {
+            //case NET_SSH1_CIPHER_NONE:
+            //    $this->crypto = new Crypt_Null();
+            //    break;
+            case NET_SSH1_CIPHER_DES:
+                if (!class_exists('Crypt_DES')) {
+                    include_once 'Crypt/DES.php';
+                }
+                $this->crypto = new Crypt_DES();
+                $this->crypto->disablePadding();
+                $this->crypto->enableContinuousBuffer();
+                $this->crypto->setKey(substr($session_key, 0, 8));
+                break;
+            case NET_SSH1_CIPHER_3DES:
+                if (!class_exists('Crypt_TripleDES')) {
+                    include_once 'Crypt/TripleDES.php';
+                }
+                $this->crypto = new Crypt_TripleDES(CRYPT_DES_MODE_3CBC);
+                $this->crypto->disablePadding();
+                $this->crypto->enableContinuousBuffer();
+                $this->crypto->setKey(substr($session_key, 0, 24));
+                break;
+            //case NET_SSH1_CIPHER_RC4:
+            //    if (!class_exists('Crypt_RC4')) {
+            //        include_once 'Crypt/RC4.php';
+            //    }
+            //    $this->crypto = new Crypt_RC4();
+            //    $this->crypto->enableContinuousBuffer();
+            //    $this->crypto->setKey(substr($session_key, 0,  16));
+            //    break;
+        }
+
+        $response = $this->_get_binary_packet();
+
+        if ($response[NET_SSH1_RESPONSE_TYPE] != NET_SSH1_SMSG_SUCCESS) {
+            user_error('Expected SSH_SMSG_SUCCESS');
+            return false;
+        }
+
+        $this->bitmap = NET_SSH1_MASK_CONNECTED;
+
+        return true;
+    }
+
+    /**
+     * Login
+     *
+     * @param string $username
+     * @param string $password
+     * @return bool
+     * @access public
+     */
+    function login($username, $password = '')
+    {
+        if (!($this->bitmap & NET_SSH1_MASK_CONSTRUCTOR)) {
+            $this->bitmap |= NET_SSH1_MASK_CONSTRUCTOR;
+            if (!$this->_connect()) {
+                return false;
+            }
+        }
+
+        if (!($this->bitmap & NET_SSH1_MASK_CONNECTED)) {
+            return false;
+        }
+
+        $data = pack('CNa*', NET_SSH1_CMSG_USER, strlen($username), $username);
+
+        if (!$this->_send_binary_packet($data)) {
+            user_error('Error sending SSH_CMSG_USER');
+            return false;
+        }
+
+        $response = $this->_get_binary_packet();
+
+        if ($response === true) {
+            return false;
+        }
+        if ($response[NET_SSH1_RESPONSE_TYPE] == NET_SSH1_SMSG_SUCCESS) {
+            $this->bitmap |= NET_SSH1_MASK_LOGIN;
+            return true;
+        } elseif ($response[NET_SSH1_RESPONSE_TYPE] != NET_SSH1_SMSG_FAILURE) {
+            user_error('Expected SSH_SMSG_SUCCESS or SSH_SMSG_FAILURE');
+            return false;
+        }
+
+        $data = pack('CNa*', NET_SSH1_CMSG_AUTH_PASSWORD, strlen($password), $password);
+
+        if (!$this->_send_binary_packet($data)) {
+            user_error('Error sending SSH_CMSG_AUTH_PASSWORD');
+            return false;
+        }
+
+        // remove the username and password from the last logged packet
+        if (defined('NET_SSH1_LOGGING') && NET_SSH1_LOGGING == NET_SSH1_LOG_COMPLEX) {
+            $data = pack('CNa*', NET_SSH1_CMSG_AUTH_PASSWORD, strlen('password'), 'password');
+            $this->message_log[count($this->message_log) - 1] = $data;
+        }
+
+        $response = $this->_get_binary_packet();
+
+        if ($response === true) {
+            return false;
+        }
+        if ($response[NET_SSH1_RESPONSE_TYPE] == NET_SSH1_SMSG_SUCCESS) {
+            $this->bitmap |= NET_SSH1_MASK_LOGIN;
+            return true;
+        } elseif ($response[NET_SSH1_RESPONSE_TYPE] == NET_SSH1_SMSG_FAILURE) {
+            return false;
+        } else {
+            user_error('Expected SSH_SMSG_SUCCESS or SSH_SMSG_FAILURE');
+            return false;
+        }
+    }
+
+    /**
+     * Set Timeout
+     *
+     * $ssh->exec('ping 127.0.0.1'); on a Linux host will never return and will run indefinitely.  setTimeout() makes it so it'll timeout.
+     * Setting $timeout to false or 0 will mean there is no timeout.
+     *
+     * @param mixed $timeout
+     */
+    function setTimeout($timeout)
+    {
+        $this->timeout = $this->curTimeout = $timeout;
+    }
+
+    /**
+     * Executes a command on a non-interactive shell, returns the output, and quits.
+     *
+     * An SSH1 server will close the connection after a command has been executed on a non-interactive shell.  SSH2
+     * servers don't, however, this isn't an SSH2 client.  The way this works, on the server, is by initiating a
+     * shell with the -s option, as discussed in the following links:
+     *
+     * {@link http://www.faqs.org/docs/bashman/bashref_65.html http://www.faqs.org/docs/bashman/bashref_65.html}
+     * {@link http://www.faqs.org/docs/bashman/bashref_62.html http://www.faqs.org/docs/bashman/bashref_62.html}
+     *
+     * To execute further commands, a new Net_SSH1 object will need to be created.
+     *
+     * Returns false on failure and the output, otherwise.
+     *
+     * @see self::interactiveRead()
+     * @see self::interactiveWrite()
+     * @param string $cmd
+     * @return mixed
+     * @access public
+     */
+    function exec($cmd, $block = true)
+    {
+        if (!($this->bitmap & NET_SSH1_MASK_LOGIN)) {
+            user_error('Operation disallowed prior to login()');
+            return false;
+        }
+
+        $data = pack('CNa*', NET_SSH1_CMSG_EXEC_CMD, strlen($cmd), $cmd);
+
+        if (!$this->_send_binary_packet($data)) {
+            user_error('Error sending SSH_CMSG_EXEC_CMD');
+            return false;
+        }
+
+        if (!$block) {
+            return true;
+        }
+
+        $output = '';
+        $response = $this->_get_binary_packet();
+
+        if ($response !== false) {
+            do {
+                $output.= substr($response[NET_SSH1_RESPONSE_DATA], 4);
+                $response = $this->_get_binary_packet();
+            } while (is_array($response) && $response[NET_SSH1_RESPONSE_TYPE] != NET_SSH1_SMSG_EXITSTATUS);
+        }
+
+        $data = pack('C', NET_SSH1_CMSG_EXIT_CONFIRMATION);
+
+        // i don't think it's really all that important if this packet gets sent or not.
+        $this->_send_binary_packet($data);
+
+        fclose($this->fsock);
+
+        // reset the execution bitmap - a new Net_SSH1 object needs to be created.
+        $this->bitmap = 0;
+
+        return $output;
+    }
+
+    /**
+     * Creates an interactive shell
+     *
+     * @see self::interactiveRead()
+     * @see self::interactiveWrite()
+     * @return bool
+     * @access private
+     */
+    function _initShell()
+    {
+        // connect using the sample parameters in protocol-1.5.txt.
+        // according to wikipedia.org's entry on text terminals, "the fundamental type of application running on a text
+        // terminal is a command line interpreter or shell".  thus, opening a terminal session to run the shell.
+        $data = pack('CNa*N4C', NET_SSH1_CMSG_REQUEST_PTY, strlen('vt100'), 'vt100', 24, 80, 0, 0, NET_SSH1_TTY_OP_END);
+
+        if (!$this->_send_binary_packet($data)) {
+            user_error('Error sending SSH_CMSG_REQUEST_PTY');
+            return false;
+        }
+
+        $response = $this->_get_binary_packet();
+
+        if ($response === true) {
+            return false;
+        }
+        if ($response[NET_SSH1_RESPONSE_TYPE] != NET_SSH1_SMSG_SUCCESS) {
+            user_error('Expected SSH_SMSG_SUCCESS');
+            return false;
+        }
+
+        $data = pack('C', NET_SSH1_CMSG_EXEC_SHELL);
+
+        if (!$this->_send_binary_packet($data)) {
+            user_error('Error sending SSH_CMSG_EXEC_SHELL');
+            return false;
+        }
+
+        $this->bitmap |= NET_SSH1_MASK_SHELL;
+
+        //stream_set_blocking($this->fsock, 0);
+
+        return true;
+    }
+
+    /**
+     * Inputs a command into an interactive shell.
+     *
+     * @see self::interactiveWrite()
+     * @param string $cmd
+     * @return bool
+     * @access public
+     */
+    function write($cmd)
+    {
+        return $this->interactiveWrite($cmd);
+    }
+
+    /**
+     * Returns the output of an interactive shell when there's a match for $expect
+     *
+     * $expect can take the form of a string literal or, if $mode == NET_SSH1_READ_REGEX,
+     * a regular expression.
+     *
+     * @see self::write()
+     * @param string $expect
+     * @param int $mode
+     * @return bool
+     * @access public
+     */
+    function read($expect, $mode = NET_SSH1_READ_SIMPLE)
+    {
+        if (!($this->bitmap & NET_SSH1_MASK_LOGIN)) {
+            user_error('Operation disallowed prior to login()');
+            return false;
+        }
+
+        if (!($this->bitmap & NET_SSH1_MASK_SHELL) && !$this->_initShell()) {
+            user_error('Unable to initiate an interactive shell session');
+            return false;
+        }
+
+        $match = $expect;
+        while (true) {
+            if ($mode == NET_SSH1_READ_REGEX) {
+                preg_match($expect, $this->interactiveBuffer, $matches);
+                $match = isset($matches[0]) ? $matches[0] : '';
+            }
+            $pos = strlen($match) ? strpos($this->interactiveBuffer, $match) : false;
+            if ($pos !== false) {
+                return $this->_string_shift($this->interactiveBuffer, $pos + strlen($match));
+            }
+            $response = $this->_get_binary_packet();
+
+            if ($response === true) {
+                return $this->_string_shift($this->interactiveBuffer, strlen($this->interactiveBuffer));
+            }
+            $this->interactiveBuffer.= substr($response[NET_SSH1_RESPONSE_DATA], 4);
+        }
+    }
+
+    /**
+     * Inputs a command into an interactive shell.
+     *
+     * @see self::interactiveRead()
+     * @param string $cmd
+     * @return bool
+     * @access public
+     */
+    function interactiveWrite($cmd)
+    {
+        if (!($this->bitmap & NET_SSH1_MASK_LOGIN)) {
+            user_error('Operation disallowed prior to login()');
+            return false;
+        }
+
+        if (!($this->bitmap & NET_SSH1_MASK_SHELL) && !$this->_initShell()) {
+            user_error('Unable to initiate an interactive shell session');
+            return false;
+        }
+
+        $data = pack('CNa*', NET_SSH1_CMSG_STDIN_DATA, strlen($cmd), $cmd);
+
+        if (!$this->_send_binary_packet($data)) {
+            user_error('Error sending SSH_CMSG_STDIN');
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * Returns the output of an interactive shell when no more output is available.
+     *
+     * Requires PHP 4.3.0 or later due to the use of the stream_select() function.  If you see stuff like
+     * "^[[00m", you're seeing ANSI escape codes.  According to
+     * {@link http://support.microsoft.com/kb/101875 How to Enable ANSI.SYS in a Command Window}, "Windows NT
+     * does not support ANSI escape sequences in Win32 Console applications", so if you're a Windows user,
+     * there's not going to be much recourse.
+     *
+     * @see self::interactiveRead()
+     * @return string
+     * @access public
+     */
+    function interactiveRead()
+    {
+        if (!($this->bitmap & NET_SSH1_MASK_LOGIN)) {
+            user_error('Operation disallowed prior to login()');
+            return false;
+        }
+
+        if (!($this->bitmap & NET_SSH1_MASK_SHELL) && !$this->_initShell()) {
+            user_error('Unable to initiate an interactive shell session');
+            return false;
+        }
+
+        $read = array($this->fsock);
+        $write = $except = null;
+        if (stream_select($read, $write, $except, 0)) {
+            $response = $this->_get_binary_packet();
+            return substr($response[NET_SSH1_RESPONSE_DATA], 4);
+        } else {
+            return '';
+        }
+    }
+
+    /**
+     * Disconnect
+     *
+     * @access public
+     */
+    function disconnect()
+    {
+        $this->_disconnect();
+    }
+
+    /**
+     * Destructor.
+     *
+     * Will be called, automatically, if you're supporting just PHP5.  If you're supporting PHP4, you'll need to call
+     * disconnect().
+     *
+     * @access public
+     */
+    function __destruct()
+    {
+        $this->_disconnect();
+    }
+
+    /**
+     * Disconnect
+     *
+     * @param string $msg
+     * @access private
+     */
+    function _disconnect($msg = 'Client Quit')
+    {
+        if ($this->bitmap) {
+            $data = pack('C', NET_SSH1_CMSG_EOF);
+            $this->_send_binary_packet($data);
+            /*
+            $response = $this->_get_binary_packet();
+            if ($response === true) {
+                $response = array(NET_SSH1_RESPONSE_TYPE => -1);
+            }
+            switch ($response[NET_SSH1_RESPONSE_TYPE]) {
+                case NET_SSH1_SMSG_EXITSTATUS:
+                    $data = pack('C', NET_SSH1_CMSG_EXIT_CONFIRMATION);
+                    break;
+                default:
+                    $data = pack('CNa*', NET_SSH1_MSG_DISCONNECT, strlen($msg), $msg);
+            }
+            */
+            $data = pack('CNa*', NET_SSH1_MSG_DISCONNECT, strlen($msg), $msg);
+
+            $this->_send_binary_packet($data);
+            fclose($this->fsock);
+            $this->bitmap = 0;
+        }
+    }
+
+    /**
+     * Gets Binary Packets
+     *
+     * See 'The Binary Packet Protocol' of protocol-1.5.txt for more info.
+     *
+     * Also, this function could be improved upon by adding detection for the following exploit:
+     * http://www.securiteam.com/securitynews/5LP042K3FY.html
+     *
+     * @see self::_send_binary_packet()
+     * @return array
+     * @access private
+     */
+    function _get_binary_packet()
+    {
+        if (feof($this->fsock)) {
+            //user_error('connection closed prematurely');
+            return false;
+        }
+
+        if ($this->curTimeout) {
+            $read = array($this->fsock);
+            $write = $except = null;
+
+            $start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838
+            $sec = floor($this->curTimeout);
+            $usec = 1000000 * ($this->curTimeout - $sec);
+            // on windows this returns a "Warning: Invalid CRT parameters detected" error
+            if (!@stream_select($read, $write, $except, $sec, $usec) && !count($read)) {
+                //$this->_disconnect('Timeout');
+                return true;
+            }
+            $elapsed = strtok(microtime(), ' ') + strtok('') - $start;
+            $this->curTimeout-= $elapsed;
+        }
+
+        $start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838
+        $data = fread($this->fsock, 4);
+        if (strlen($data) < 4) {
+            return false;
+        }
+        $temp = unpack('Nlength', $data);
+
+        $padding_length = 8 - ($temp['length'] & 7);
+        $length = $temp['length'] + $padding_length;
+        $raw = '';
+
+        while ($length > 0) {
+            $temp = fread($this->fsock, $length);
+            $raw.= $temp;
+            $length-= strlen($temp);
+        }
+        $stop = strtok(microtime(), ' ') + strtok('');
+
+        if (strlen($raw) && $this->crypto !== false) {
+            $raw = $this->crypto->decrypt($raw);
+        }
+
+        $padding = substr($raw, 0, $padding_length);
+        $type = $raw[$padding_length];
+        $data = substr($raw, $padding_length + 1, -4);
+
+        if (strlen($raw) < 4) {
+            return false;
+        }
+        $temp = unpack('Ncrc', substr($raw, -4));
+
+        //if ( $temp['crc'] != $this->_crc($padding . $type . $data) ) {
+        //    user_error('Bad CRC in packet from server');
+        //    return false;
+        //}
+
+        $type = ord($type);
+
+        if (defined('NET_SSH1_LOGGING')) {
+            $temp = isset($this->protocol_flags[$type]) ? $this->protocol_flags[$type] : 'UNKNOWN';
+            $temp = '<- ' . $temp .
+                    ' (' . round($stop - $start, 4) . 's)';
+            $this->_append_log($temp, $data);
+        }
+
+        return array(
+            NET_SSH1_RESPONSE_TYPE => $type,
+            NET_SSH1_RESPONSE_DATA => $data
+        );
+    }
+
+    /**
+     * Sends Binary Packets
+     *
+     * Returns true on success, false on failure.
+     *
+     * @see self::_get_binary_packet()
+     * @param string $data
+     * @return bool
+     * @access private
+     */
+    function _send_binary_packet($data)
+    {
+        if (feof($this->fsock)) {
+            //user_error('connection closed prematurely');
+            return false;
+        }
+
+        $length = strlen($data) + 4;
+
+        $padding = crypt_random_string(8 - ($length & 7));
+
+        $orig = $data;
+        $data = $padding . $data;
+        $data.= pack('N', $this->_crc($data));
+
+        if ($this->crypto !== false) {
+            $data = $this->crypto->encrypt($data);
+        }
+
+        $packet = pack('Na*', $length, $data);
+
+        $start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838
+        $result = strlen($packet) == fputs($this->fsock, $packet);
+        $stop = strtok(microtime(), ' ') + strtok('');
+
+        if (defined('NET_SSH1_LOGGING')) {
+            $temp = isset($this->protocol_flags[ord($orig[0])]) ? $this->protocol_flags[ord($orig[0])] : 'UNKNOWN';
+            $temp = '-> ' . $temp .
+                    ' (' . round($stop - $start, 4) . 's)';
+            $this->_append_log($temp, $orig);
+        }
+
+        return $result;
+    }
+
+    /**
+     * Cyclic Redundancy Check (CRC)
+     *
+     * PHP's crc32 function is implemented slightly differently than the one that SSH v1 uses, so
+     * we've reimplemented it. A more detailed discussion of the differences can be found after
+     * $crc_lookup_table's initialization.
+     *
+     * @see self::_get_binary_packet()
+     * @see self::_send_binary_packet()
+     * @param string $data
+     * @return int
+     * @access private
+     */
+    function _crc($data)
+    {
+        static $crc_lookup_table = array(
+            0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA,
+            0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
+            0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
+            0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
+            0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE,
+            0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
+            0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC,
+            0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5,
+            0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
+            0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
+            0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940,
+            0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
+            0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116,
+            0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
+            0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
+            0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,
+            0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A,
+            0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
+            0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818,
+            0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
+            0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,
+            0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457,
+            0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C,
+            0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
+            0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2,
+            0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB,
+            0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
+            0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
+            0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086,
+            0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
+            0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4,
+            0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,
+            0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A,
+            0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
+            0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8,
+            0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
+            0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE,
+            0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7,
+            0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC,
+            0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
+            0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252,
+            0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
+            0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60,
+            0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79,
+            0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
+            0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F,
+            0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04,
+            0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
+            0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A,
+            0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
+            0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,
+            0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21,
+            0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E,
+            0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
+            0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C,
+            0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
+            0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,
+            0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB,
+            0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0,
+            0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
+            0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6,
+            0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
+            0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
+            0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
+        );
+
+        // For this function to yield the same output as PHP's crc32 function, $crc would have to be
+        // set to 0xFFFFFFFF, initially - not 0x00000000 as it currently is.
+        $crc = 0x00000000;
+        $length = strlen($data);
+
+        for ($i=0; $i<$length; $i++) {
+            // We AND $crc >> 8 with 0x00FFFFFF because we want the eight newly added bits to all
+            // be zero.  PHP, unfortunately, doesn't always do this.  0x80000000 >> 8, as an example,
+            // yields 0xFF800000 - not 0x00800000.  The following link elaborates:
+            // http://www.php.net/manual/en/language.operators.bitwise.php#57281
+            $crc = (($crc >> 8) & 0x00FFFFFF) ^ $crc_lookup_table[($crc & 0xFF) ^ ord($data[$i])];
+        }
+
+        // In addition to having to set $crc to 0xFFFFFFFF, initially, the return value must be XOR'd with
+        // 0xFFFFFFFF for this function to return the same thing that PHP's crc32 function would.
+        return $crc;
+    }
+
+    /**
+     * String Shift
+     *
+     * Inspired by array_shift
+     *
+     * @param string $string
+     * @param int $index
+     * @return string
+     * @access private
+     */
+    function _string_shift(&$string, $index = 1)
+    {
+        $substr = substr($string, 0, $index);
+        $string = substr($string, $index);
+        return $substr;
+    }
+
+    /**
+     * RSA Encrypt
+     *
+     * Returns mod(pow($m, $e), $n), where $n should be the product of two (large) primes $p and $q and where $e
+     * should be a number with the property that gcd($e, ($p - 1) * ($q - 1)) == 1.  Could just make anything that
+     * calls this call modexp, instead, but I think this makes things clearer, maybe...
+     *
+     * @see self::Net_SSH1()
+     * @param Math_BigInteger $m
+     * @param array $key
+     * @return Math_BigInteger
+     * @access private
+     */
+    function _rsa_crypt($m, $key)
+    {
+        /*
+        if (!class_exists('Crypt_RSA')) {
+            include_once 'Crypt/RSA.php';
+        }
+
+        $rsa = new Crypt_RSA();
+        $rsa->loadKey($key, CRYPT_RSA_PUBLIC_FORMAT_RAW);
+        $rsa->setEncryptionMode(CRYPT_RSA_ENCRYPTION_PKCS1);
+        return $rsa->encrypt($m);
+        */
+
+        // To quote from protocol-1.5.txt:
+        // The most significant byte (which is only partial as the value must be
+        // less than the public modulus, which is never a power of two) is zero.
+        //
+        // The next byte contains the value 2 (which stands for public-key
+        // encrypted data in the PKCS standard [PKCS#1]).  Then, there are non-
+        // zero random bytes to fill any unused space, a zero byte, and the data
+        // to be encrypted in the least significant bytes, the last byte of the
+        // data in the least significant byte.
+
+        // Presumably the part of PKCS#1 they're refering to is "Section 7.2.1 Encryption Operation",
+        // under "7.2 RSAES-PKCS1-v1.5" and "7 Encryption schemes" of the following URL:
+        // ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-1/pkcs-1v2-1.pdf
+        $modulus = $key[1]->toBytes();
+        $length = strlen($modulus) - strlen($m) - 3;
+        $random = '';
+        while (strlen($random) != $length) {
+            $block = crypt_random_string($length - strlen($random));
+            $block = str_replace("\x00", '', $block);
+            $random.= $block;
+        }
+        $temp = chr(0) . chr(2) . $random . chr(0) . $m;
+
+        $m = new Math_BigInteger($temp, 256);
+        $m = $m->modPow($key[0], $key[1]);
+
+        return $m->toBytes();
+    }
+
+    /**
+     * Define Array
+     *
+     * Takes any number of arrays whose indices are integers and whose values are strings and defines a bunch of
+     * named constants from it, using the value as the name of the constant and the index as the value of the constant.
+     * If any of the constants that would be defined already exists, none of the constants will be defined.
+     *
+     * @param array $array
+     * @access private
+     */
+    function _define_array()
+    {
+        $args = func_get_args();
+        foreach ($args as $arg) {
+            foreach ($arg as $key => $value) {
+                if (!defined($value)) {
+                    define($value, $key);
+                } else {
+                    break 2;
+                }
+            }
+        }
+    }
+
+    /**
+     * Returns a log of the packets that have been sent and received.
+     *
+     * Returns a string if NET_SSH1_LOGGING == NET_SSH1_LOG_COMPLEX, an array if NET_SSH1_LOGGING == NET_SSH1_LOG_SIMPLE and false if !defined('NET_SSH1_LOGGING')
+     *
+     * @access public
+     * @return array|false|string
+     */
+    function getLog()
+    {
+        if (!defined('NET_SSH1_LOGGING')) {
+            return false;
+        }
+
+        switch (NET_SSH1_LOGGING) {
+            case NET_SSH1_LOG_SIMPLE:
+                return $this->message_number_log;
+                break;
+            case NET_SSH1_LOG_COMPLEX:
+                return $this->_format_log($this->message_log, $this->protocol_flags_log);
+                break;
+            default:
+                return false;
+        }
+    }
+
+    /**
+     * Formats a log for printing
+     *
+     * @param array $message_log
+     * @param array $message_number_log
+     * @access private
+     * @return string
+     */
+    function _format_log($message_log, $message_number_log)
+    {
+        $output = '';
+        for ($i = 0; $i < count($message_log); $i++) {
+            $output.= $message_number_log[$i] . "\r\n";
+            $current_log = $message_log[$i];
+            $j = 0;
+            do {
+                if (strlen($current_log)) {
+                    $output.= str_pad(dechex($j), 7, '0', STR_PAD_LEFT) . '0  ';
+                }
+                $fragment = $this->_string_shift($current_log, $this->log_short_width);
+                $hex = substr(preg_replace_callback('#.#s', array($this, '_format_log_helper'), $fragment), strlen($this->log_boundary));
+                // replace non ASCII printable characters with dots
+                // http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters
+                // also replace < with a . since < messes up the output on web browsers
+                $raw = preg_replace('#[^\x20-\x7E]|<#', '.', $fragment);
+                $output.= str_pad($hex, $this->log_long_width - $this->log_short_width, ' ') . $raw . "\r\n";
+                $j++;
+            } while (strlen($current_log));
+            $output.= "\r\n";
+        }
+
+        return $output;
+    }
+
+    /**
+     * Helper function for _format_log
+     *
+     * For use with preg_replace_callback()
+     *
+     * @param array $matches
+     * @access private
+     * @return string
+     */
+    function _format_log_helper($matches)
+    {
+        return $this->log_boundary . str_pad(dechex(ord($matches[0])), 2, '0', STR_PAD_LEFT);
+    }
+
+    /**
+     * Return the server key public exponent
+     *
+     * Returns, by default, the base-10 representation.  If $raw_output is set to true, returns, instead,
+     * the raw bytes.  This behavior is similar to PHP's md5() function.
+     *
+     * @param bool $raw_output
+     * @return string
+     * @access public
+     */
+    function getServerKeyPublicExponent($raw_output = false)
+    {
+        return $raw_output ? $this->server_key_public_exponent->toBytes() : $this->server_key_public_exponent->toString();
+    }
+
+    /**
+     * Return the server key public modulus
+     *
+     * Returns, by default, the base-10 representation.  If $raw_output is set to true, returns, instead,
+     * the raw bytes.  This behavior is similar to PHP's md5() function.
+     *
+     * @param bool $raw_output
+     * @return string
+     * @access public
+     */
+    function getServerKeyPublicModulus($raw_output = false)
+    {
+        return $raw_output ? $this->server_key_public_modulus->toBytes() : $this->server_key_public_modulus->toString();
+    }
+
+    /**
+     * Return the host key public exponent
+     *
+     * Returns, by default, the base-10 representation.  If $raw_output is set to true, returns, instead,
+     * the raw bytes.  This behavior is similar to PHP's md5() function.
+     *
+     * @param bool $raw_output
+     * @return string
+     * @access public
+     */
+    function getHostKeyPublicExponent($raw_output = false)
+    {
+        return $raw_output ? $this->host_key_public_exponent->toBytes() : $this->host_key_public_exponent->toString();
+    }
+
+    /**
+     * Return the host key public modulus
+     *
+     * Returns, by default, the base-10 representation.  If $raw_output is set to true, returns, instead,
+     * the raw bytes.  This behavior is similar to PHP's md5() function.
+     *
+     * @param bool $raw_output
+     * @return string
+     * @access public
+     */
+    function getHostKeyPublicModulus($raw_output = false)
+    {
+        return $raw_output ? $this->host_key_public_modulus->toBytes() : $this->host_key_public_modulus->toString();
+    }
+
+    /**
+     * Return a list of ciphers supported by SSH1 server.
+     *
+     * Just because a cipher is supported by an SSH1 server doesn't mean it's supported by this library. If $raw_output
+     * is set to true, returns, instead, an array of constants.  ie. instead of array('Triple-DES in CBC mode'), you'll
+     * get array(NET_SSH1_CIPHER_3DES).
+     *
+     * @param bool $raw_output
+     * @return array
+     * @access public
+     */
+    function getSupportedCiphers($raw_output = false)
+    {
+        return $raw_output ? array_keys($this->supported_ciphers) : array_values($this->supported_ciphers);
+    }
+
+    /**
+     * Return a list of authentications supported by SSH1 server.
+     *
+     * Just because a cipher is supported by an SSH1 server doesn't mean it's supported by this library. If $raw_output
+     * is set to true, returns, instead, an array of constants.  ie. instead of array('password authentication'), you'll
+     * get array(NET_SSH1_AUTH_PASSWORD).
+     *
+     * @param bool $raw_output
+     * @return array
+     * @access public
+     */
+    function getSupportedAuthentications($raw_output = false)
+    {
+        return $raw_output ? array_keys($this->supported_authentications) : array_values($this->supported_authentications);
+    }
+
+    /**
+     * Return the server identification.
+     *
+     * @return string
+     * @access public
+     */
+    function getServerIdentification()
+    {
+        return rtrim($this->server_identification);
+    }
+
+    /**
+     * Logs data packets
+     *
+     * Makes sure that only the last 1MB worth of packets will be logged
+     *
+     * @param string $data
+     * @access private
+     */
+    function _append_log($protocol_flags, $message)
+    {
+        switch (NET_SSH1_LOGGING) {
+            // useful for benchmarks
+            case NET_SSH1_LOG_SIMPLE:
+                $this->protocol_flags_log[] = $protocol_flags;
+                break;
+            // the most useful log for SSH1
+            case NET_SSH1_LOG_COMPLEX:
+                $this->protocol_flags_log[] = $protocol_flags;
+                $this->_string_shift($message);
+                $this->log_size+= strlen($message);
+                $this->message_log[] = $message;
+                while ($this->log_size > NET_SSH1_LOG_MAX_SIZE) {
+                    $this->log_size-= strlen(array_shift($this->message_log));
+                    array_shift($this->protocol_flags_log);
+                }
+                break;
+            // dump the output out realtime; packets may be interspersed with non packets,
+            // passwords won't be filtered out and select other packets may not be correctly
+            // identified
+            case NET_SSH1_LOG_REALTIME:
+                echo "<pre>\r\n" . $this->_format_log(array($message), array($protocol_flags)) . "\r\n</pre>\r\n";
+                @flush();
+                @ob_flush();
+                break;
+            // basically the same thing as NET_SSH1_LOG_REALTIME with the caveat that NET_SSH1_LOG_REALTIME_FILE
+            // needs to be defined and that the resultant log file will be capped out at NET_SSH1_LOG_MAX_SIZE.
+            // the earliest part of the log file is denoted by the first <<< START >>> and is not going to necessarily
+            // at the beginning of the file
+            case NET_SSH1_LOG_REALTIME_FILE:
+                if (!isset($this->realtime_log_file)) {
+                    // PHP doesn't seem to like using constants in fopen()
+                    $filename = NET_SSH1_LOG_REALTIME_FILE;
+                    $fp = fopen($filename, 'w');
+                    $this->realtime_log_file = $fp;
+                }
+                if (!is_resource($this->realtime_log_file)) {
+                    break;
+                }
+                $entry = $this->_format_log(array($message), array($protocol_flags));
+                if ($this->realtime_log_wrap) {
+                    $temp = "<<< START >>>\r\n";
+                    $entry.= $temp;
+                    fseek($this->realtime_log_file, ftell($this->realtime_log_file) - strlen($temp));
+                }
+                $this->realtime_log_size+= strlen($entry);
+                if ($this->realtime_log_size > NET_SSH1_LOG_MAX_SIZE) {
+                    fseek($this->realtime_log_file, 0);
+                    $this->realtime_log_size = strlen($entry);
+                    $this->realtime_log_wrap = true;
+                }
+                fputs($this->realtime_log_file, $entry);
+        }
+    }
+}
diff --git a/lib/php/phpseclib/Net/SSH2.php b/lib/php/phpseclib/Net/SSH2.php
new file mode 100644
index 00000000..d45208a9
--- /dev/null
+++ b/lib/php/phpseclib/Net/SSH2.php
@@ -0,0 +1,4886 @@
+<?php
+
+/**
+ * Pure-PHP implementation of SSHv2.
+ *
+ * PHP versions 4 and 5
+ *
+ * Here are some examples of how to use this library:
+ * <code>
+ * <?php
+ *    include 'Net/SSH2.php';
+ *
+ *    $ssh = new Net_SSH2('www.domain.tld');
+ *    if (!$ssh->login('username', 'password')) {
+ *        exit('Login Failed');
+ *    }
+ *
+ *    echo $ssh->exec('pwd');
+ *    echo $ssh->exec('ls -la');
+ * ?>
+ * </code>
+ *
+ * <code>
+ * <?php
+ *    include 'Crypt/RSA.php';
+ *    include 'Net/SSH2.php';
+ *
+ *    $key = new Crypt_RSA();
+ *    //$key->setPassword('whatever');
+ *    $key->loadKey(file_get_contents('privatekey'));
+ *
+ *    $ssh = new Net_SSH2('www.domain.tld');
+ *    if (!$ssh->login('username', $key)) {
+ *        exit('Login Failed');
+ *    }
+ *
+ *    echo $ssh->read('username@username:~$');
+ *    $ssh->write("ls -la\n");
+ *    echo $ssh->read('username@username:~$');
+ * ?>
+ * </code>
+ *
+ * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @category  Net
+ * @package   Net_SSH2
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2007 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+
+/**#@+
+ * Execution Bitmap Masks
+ *
+ * @see self::bitmap
+ * @access private
+ */
+define('NET_SSH2_MASK_CONSTRUCTOR',   0x00000001);
+define('NET_SSH2_MASK_CONNECTED',     0x00000002);
+define('NET_SSH2_MASK_LOGIN_REQ',     0x00000004);
+define('NET_SSH2_MASK_LOGIN',         0x00000008);
+define('NET_SSH2_MASK_SHELL',         0x00000010);
+define('NET_SSH2_MASK_WINDOW_ADJUST', 0x00000020);
+/**#@-*/
+
+/**#@+
+ * Channel constants
+ *
+ * RFC4254 refers not to client and server channels but rather to sender and recipient channels.  we don't refer
+ * to them in that way because RFC4254 toggles the meaning. the client sends a SSH_MSG_CHANNEL_OPEN message with
+ * a sender channel and the server sends a SSH_MSG_CHANNEL_OPEN_CONFIRMATION in response, with a sender and a
+ * recepient channel.  at first glance, you might conclude that SSH_MSG_CHANNEL_OPEN_CONFIRMATION's sender channel
+ * would be the same thing as SSH_MSG_CHANNEL_OPEN's sender channel, but it's not, per this snipet:
+ *     The 'recipient channel' is the channel number given in the original
+ *     open request, and 'sender channel' is the channel number allocated by
+ *     the other side.
+ *
+ * @see self::_send_channel_packet()
+ * @see self::_get_channel_packet()
+ * @access private
+ */
+define('NET_SSH2_CHANNEL_EXEC',      1); // PuTTy uses 0x100
+define('NET_SSH2_CHANNEL_SHELL',     2);
+define('NET_SSH2_CHANNEL_SUBSYSTEM', 3);
+define('NET_SSH2_CHANNEL_AGENT_FORWARD', 4);
+/**#@-*/
+
+/**#@+
+ * @access public
+ * @see self::getLog()
+ */
+/**
+ * Returns the message numbers
+ */
+define('NET_SSH2_LOG_SIMPLE',  1);
+/**
+ * Returns the message content
+ */
+define('NET_SSH2_LOG_COMPLEX', 2);
+/**
+ * Outputs the content real-time
+ */
+define('NET_SSH2_LOG_REALTIME', 3);
+/**
+ * Dumps the content real-time to a file
+ */
+define('NET_SSH2_LOG_REALTIME_FILE', 4);
+/**
+ * Make sure that the log never gets larger than this
+ */
+define('NET_SSH2_LOG_MAX_SIZE', 1024 * 1024);
+/**#@-*/
+
+/**#@+
+ * @access public
+ * @see self::read()
+ */
+/**
+ * Returns when a string matching $expect exactly is found
+ */
+define('NET_SSH2_READ_SIMPLE',  1);
+/**
+ * Returns when a string matching the regular expression $expect is found
+ */
+define('NET_SSH2_READ_REGEX', 2);
+/**
+ * Returns when a string matching the regular expression $expect is found
+ */
+define('NET_SSH2_READ_NEXT', 3);
+/**#@-*/
+
+/**
+ * Pure-PHP implementation of SSHv2.
+ *
+ * @package Net_SSH2
+ * @author  Jim Wigginton <terrafrost@php.net>
+ * @access  public
+ */
+class Net_SSH2
+{
+    /**
+     * The SSH identifier
+     *
+     * @var string
+     * @access private
+     */
+    var $identifier;
+
+    /**
+     * The Socket Object
+     *
+     * @var object
+     * @access private
+     */
+    var $fsock;
+
+    /**
+     * Execution Bitmap
+     *
+     * The bits that are set represent functions that have been called already.  This is used to determine
+     * if a requisite function has been successfully executed.  If not, an error should be thrown.
+     *
+     * @var int
+     * @access private
+     */
+    var $bitmap = 0;
+
+    /**
+     * Error information
+     *
+     * @see self::getErrors()
+     * @see self::getLastError()
+     * @var string
+     * @access private
+     */
+    var $errors = array();
+
+    /**
+     * Server Identifier
+     *
+     * @see self::getServerIdentification()
+     * @var array|false
+     * @access private
+     */
+    var $server_identifier = false;
+
+    /**
+     * Key Exchange Algorithms
+     *
+     * @see self::getKexAlgorithims()
+     * @var array|false
+     * @access private
+     */
+    var $kex_algorithms = false;
+
+    /**
+     * Minimum Diffie-Hellman Group Bit Size in RFC 4419 Key Exchange Methods
+     *
+     * @see self::_key_exchange()
+     * @var int
+     * @access private
+     */
+    var $kex_dh_group_size_min = 1536;
+
+    /**
+     * Preferred Diffie-Hellman Group Bit Size in RFC 4419 Key Exchange Methods
+     *
+     * @see self::_key_exchange()
+     * @var int
+     * @access private
+     */
+    var $kex_dh_group_size_preferred = 2048;
+
+    /**
+     * Maximum Diffie-Hellman Group Bit Size in RFC 4419 Key Exchange Methods
+     *
+     * @see self::_key_exchange()
+     * @var int
+     * @access private
+     */
+    var $kex_dh_group_size_max = 4096;
+
+    /**
+     * Server Host Key Algorithms
+     *
+     * @see self::getServerHostKeyAlgorithms()
+     * @var array|false
+     * @access private
+     */
+    var $server_host_key_algorithms = false;
+
+    /**
+     * Encryption Algorithms: Client to Server
+     *
+     * @see self::getEncryptionAlgorithmsClient2Server()
+     * @var array|false
+     * @access private
+     */
+    var $encryption_algorithms_client_to_server = false;
+
+    /**
+     * Encryption Algorithms: Server to Client
+     *
+     * @see self::getEncryptionAlgorithmsServer2Client()
+     * @var array|false
+     * @access private
+     */
+    var $encryption_algorithms_server_to_client = false;
+
+    /**
+     * MAC Algorithms: Client to Server
+     *
+     * @see self::getMACAlgorithmsClient2Server()
+     * @var array|false
+     * @access private
+     */
+    var $mac_algorithms_client_to_server = false;
+
+    /**
+     * MAC Algorithms: Server to Client
+     *
+     * @see self::getMACAlgorithmsServer2Client()
+     * @var array|false
+     * @access private
+     */
+    var $mac_algorithms_server_to_client = false;
+
+    /**
+     * Compression Algorithms: Client to Server
+     *
+     * @see self::getCompressionAlgorithmsClient2Server()
+     * @var array|false
+     * @access private
+     */
+    var $compression_algorithms_client_to_server = false;
+
+    /**
+     * Compression Algorithms: Server to Client
+     *
+     * @see self::getCompressionAlgorithmsServer2Client()
+     * @var array|false
+     * @access private
+     */
+    var $compression_algorithms_server_to_client = false;
+
+    /**
+     * Languages: Server to Client
+     *
+     * @see self::getLanguagesServer2Client()
+     * @var array|false
+     * @access private
+     */
+    var $languages_server_to_client = false;
+
+    /**
+     * Languages: Client to Server
+     *
+     * @see self::getLanguagesClient2Server()
+     * @var array|false
+     * @access private
+     */
+    var $languages_client_to_server = false;
+
+    /**
+     * Block Size for Server to Client Encryption
+     *
+     * "Note that the length of the concatenation of 'packet_length',
+     *  'padding_length', 'payload', and 'random padding' MUST be a multiple
+     *  of the cipher block size or 8, whichever is larger.  This constraint
+     *  MUST be enforced, even when using stream ciphers."
+     *
+     *  -- http://tools.ietf.org/html/rfc4253#section-6
+     *
+     * @see self::Net_SSH2()
+     * @see self::_send_binary_packet()
+     * @var int
+     * @access private
+     */
+    var $encrypt_block_size = 8;
+
+    /**
+     * Block Size for Client to Server Encryption
+     *
+     * @see self::Net_SSH2()
+     * @see self::_get_binary_packet()
+     * @var int
+     * @access private
+     */
+    var $decrypt_block_size = 8;
+
+    /**
+     * Server to Client Encryption Object
+     *
+     * @see self::_get_binary_packet()
+     * @var object
+     * @access private
+     */
+    var $decrypt = false;
+
+    /**
+     * Client to Server Encryption Object
+     *
+     * @see self::_send_binary_packet()
+     * @var object
+     * @access private
+     */
+    var $encrypt = false;
+
+    /**
+     * Client to Server HMAC Object
+     *
+     * @see self::_send_binary_packet()
+     * @var object
+     * @access private
+     */
+    var $hmac_create = false;
+
+    /**
+     * Server to Client HMAC Object
+     *
+     * @see self::_get_binary_packet()
+     * @var object
+     * @access private
+     */
+    var $hmac_check = false;
+
+    /**
+     * Size of server to client HMAC
+     *
+     * We need to know how big the HMAC will be for the server to client direction so that we know how many bytes to read.
+     * For the client to server side, the HMAC object will make the HMAC as long as it needs to be.  All we need to do is
+     * append it.
+     *
+     * @see self::_get_binary_packet()
+     * @var int
+     * @access private
+     */
+    var $hmac_size = false;
+
+    /**
+     * Server Public Host Key
+     *
+     * @see self::getServerPublicHostKey()
+     * @var string
+     * @access private
+     */
+    var $server_public_host_key;
+
+    /**
+     * Session identifier
+     *
+     * "The exchange hash H from the first key exchange is additionally
+     *  used as the session identifier, which is a unique identifier for
+     *  this connection."
+     *
+     *  -- http://tools.ietf.org/html/rfc4253#section-7.2
+     *
+     * @see self::_key_exchange()
+     * @var string
+     * @access private
+     */
+    var $session_id = false;
+
+    /**
+     * Exchange hash
+     *
+     * The current exchange hash
+     *
+     * @see self::_key_exchange()
+     * @var string
+     * @access private
+     */
+    var $exchange_hash = false;
+
+    /**
+     * Message Numbers
+     *
+     * @see self::Net_SSH2()
+     * @var array
+     * @access private
+     */
+    var $message_numbers = array();
+
+    /**
+     * Disconnection Message 'reason codes' defined in RFC4253
+     *
+     * @see self::Net_SSH2()
+     * @var array
+     * @access private
+     */
+    var $disconnect_reasons = array();
+
+    /**
+     * SSH_MSG_CHANNEL_OPEN_FAILURE 'reason codes', defined in RFC4254
+     *
+     * @see self::Net_SSH2()
+     * @var array
+     * @access private
+     */
+    var $channel_open_failure_reasons = array();
+
+    /**
+     * Terminal Modes
+     *
+     * @link http://tools.ietf.org/html/rfc4254#section-8
+     * @see self::Net_SSH2()
+     * @var array
+     * @access private
+     */
+    var $terminal_modes = array();
+
+    /**
+     * SSH_MSG_CHANNEL_EXTENDED_DATA's data_type_codes
+     *
+     * @link http://tools.ietf.org/html/rfc4254#section-5.2
+     * @see self::Net_SSH2()
+     * @var array
+     * @access private
+     */
+    var $channel_extended_data_type_codes = array();
+
+    /**
+     * Send Sequence Number
+     *
+     * See 'Section 6.4.  Data Integrity' of rfc4253 for more info.
+     *
+     * @see self::_send_binary_packet()
+     * @var int
+     * @access private
+     */
+    var $send_seq_no = 0;
+
+    /**
+     * Get Sequence Number
+     *
+     * See 'Section 6.4.  Data Integrity' of rfc4253 for more info.
+     *
+     * @see self::_get_binary_packet()
+     * @var int
+     * @access private
+     */
+    var $get_seq_no = 0;
+
+    /**
+     * Server Channels
+     *
+     * Maps client channels to server channels
+     *
+     * @see self::_get_channel_packet()
+     * @see self::exec()
+     * @var array
+     * @access private
+     */
+    var $server_channels = array();
+
+    /**
+     * Channel Buffers
+     *
+     * If a client requests a packet from one channel but receives two packets from another those packets should
+     * be placed in a buffer
+     *
+     * @see self::_get_channel_packet()
+     * @see self::exec()
+     * @var array
+     * @access private
+     */
+    var $channel_buffers = array();
+
+    /**
+     * Channel Status
+     *
+     * Contains the type of the last sent message
+     *
+     * @see self::_get_channel_packet()
+     * @var array
+     * @access private
+     */
+    var $channel_status = array();
+
+    /**
+     * Packet Size
+     *
+     * Maximum packet size indexed by channel
+     *
+     * @see self::_send_channel_packet()
+     * @var array
+     * @access private
+     */
+    var $packet_size_client_to_server = array();
+
+    /**
+     * Message Number Log
+     *
+     * @see self::getLog()
+     * @var array
+     * @access private
+     */
+    var $message_number_log = array();
+
+    /**
+     * Message Log
+     *
+     * @see self::getLog()
+     * @var array
+     * @access private
+     */
+    var $message_log = array();
+
+    /**
+     * The Window Size
+     *
+     * Bytes the other party can send before it must wait for the window to be adjusted (0x7FFFFFFF = 2GB)
+     *
+     * @var int
+     * @see self::_send_channel_packet()
+     * @see self::exec()
+     * @access private
+     */
+    var $window_size = 0x7FFFFFFF;
+
+    /**
+     * Window size, server to client
+     *
+     * Window size indexed by channel
+     *
+     * @see self::_send_channel_packet()
+     * @var array
+     * @access private
+     */
+    var $window_size_server_to_client = array();
+
+    /**
+     * Window size, client to server
+     *
+     * Window size indexed by channel
+     *
+     * @see self::_get_channel_packet()
+     * @var array
+     * @access private
+     */
+    var $window_size_client_to_server = array();
+
+    /**
+     * Server signature
+     *
+     * Verified against $this->session_id
+     *
+     * @see self::getServerPublicHostKey()
+     * @var string
+     * @access private
+     */
+    var $signature = '';
+
+    /**
+     * Server signature format
+     *
+     * ssh-rsa or ssh-dss.
+     *
+     * @see self::getServerPublicHostKey()
+     * @var string
+     * @access private
+     */
+    var $signature_format = '';
+
+    /**
+     * Interactive Buffer
+     *
+     * @see self::read()
+     * @var array
+     * @access private
+     */
+    var $interactiveBuffer = '';
+
+    /**
+     * Current log size
+     *
+     * Should never exceed NET_SSH2_LOG_MAX_SIZE
+     *
+     * @see self::_send_binary_packet()
+     * @see self::_get_binary_packet()
+     * @var int
+     * @access private
+     */
+    var $log_size;
+
+    /**
+     * Timeout
+     *
+     * @see self::setTimeout()
+     * @access private
+     */
+    var $timeout;
+
+    /**
+     * Current Timeout
+     *
+     * @see self::_get_channel_packet()
+     * @access private
+     */
+    var $curTimeout;
+
+    /**
+     * Real-time log file pointer
+     *
+     * @see self::_append_log()
+     * @var resource
+     * @access private
+     */
+    var $realtime_log_file;
+
+    /**
+     * Real-time log file size
+     *
+     * @see self::_append_log()
+     * @var int
+     * @access private
+     */
+    var $realtime_log_size;
+
+    /**
+     * Has the signature been validated?
+     *
+     * @see self::getServerPublicHostKey()
+     * @var bool
+     * @access private
+     */
+    var $signature_validated = false;
+
+    /**
+     * Real-time log file wrap boolean
+     *
+     * @see self::_append_log()
+     * @access private
+     */
+    var $realtime_log_wrap;
+
+    /**
+     * Flag to suppress stderr from output
+     *
+     * @see self::enableQuietMode()
+     * @access private
+     */
+    var $quiet_mode = false;
+
+    /**
+     * Time of first network activity
+     *
+     * @var int
+     * @access private
+     */
+    var $last_packet;
+
+    /**
+     * Exit status returned from ssh if any
+     *
+     * @var int
+     * @access private
+     */
+    var $exit_status;
+
+    /**
+     * Flag to request a PTY when using exec()
+     *
+     * @var bool
+     * @see self::enablePTY()
+     * @access private
+     */
+    var $request_pty = false;
+
+    /**
+     * Flag set while exec() is running when using enablePTY()
+     *
+     * @var bool
+     * @access private
+     */
+    var $in_request_pty_exec = false;
+
+    /**
+     * Flag set after startSubsystem() is called
+     *
+     * @var bool
+     * @access private
+     */
+    var $in_subsystem;
+
+    /**
+     * Contents of stdError
+     *
+     * @var string
+     * @access private
+     */
+    var $stdErrorLog;
+
+    /**
+     * The Last Interactive Response
+     *
+     * @see self::_keyboard_interactive_process()
+     * @var string
+     * @access private
+     */
+    var $last_interactive_response = '';
+
+    /**
+     * Keyboard Interactive Request / Responses
+     *
+     * @see self::_keyboard_interactive_process()
+     * @var array
+     * @access private
+     */
+    var $keyboard_requests_responses = array();
+
+    /**
+     * Banner Message
+     *
+     * Quoting from the RFC, "in some jurisdictions, sending a warning message before
+     * authentication may be relevant for getting legal protection."
+     *
+     * @see self::_filter()
+     * @see self::getBannerMessage()
+     * @var string
+     * @access private
+     */
+    var $banner_message = '';
+
+    /**
+     * Did read() timeout or return normally?
+     *
+     * @see self::isTimeout()
+     * @var bool
+     * @access private
+     */
+    var $is_timeout = false;
+
+    /**
+     * Log Boundary
+     *
+     * @see self::_format_log()
+     * @var string
+     * @access private
+     */
+    var $log_boundary = ':';
+
+    /**
+     * Log Long Width
+     *
+     * @see self::_format_log()
+     * @var int
+     * @access private
+     */
+    var $log_long_width = 65;
+
+    /**
+     * Log Short Width
+     *
+     * @see self::_format_log()
+     * @var int
+     * @access private
+     */
+    var $log_short_width = 16;
+
+    /**
+     * Hostname
+     *
+     * @see self::Net_SSH2()
+     * @see self::_connect()
+     * @var string
+     * @access private
+     */
+    var $host;
+
+    /**
+     * Port Number
+     *
+     * @see self::Net_SSH2()
+     * @see self::_connect()
+     * @var int
+     * @access private
+     */
+    var $port;
+
+    /**
+     * Number of columns for terminal window size
+     *
+     * @see self::getWindowColumns()
+     * @see self::setWindowColumns()
+     * @see self::setWindowSize()
+     * @var int
+     * @access private
+     */
+    var $windowColumns = 80;
+
+    /**
+     * Number of columns for terminal window size
+     *
+     * @see self::getWindowRows()
+     * @see self::setWindowRows()
+     * @see self::setWindowSize()
+     * @var int
+     * @access private
+     */
+    var $windowRows = 24;
+
+    /**
+     * Crypto Engine
+     *
+     * @see self::setCryptoEngine()
+     * @see self::_key_exchange()
+     * @var int
+     * @access private
+     */
+    var $crypto_engine = false;
+
+    /**
+     * A System_SSH_Agent for use in the SSH2 Agent Forwarding scenario
+     *
+     * @var System_SSH_Agent
+     * @access private
+     */
+    var $agent;
+
+    /**
+     * Send the identification string first?
+     *
+     * @var bool
+     * @access private
+     */
+    var $send_id_string_first = true;
+
+    /**
+     * Send the key exchange initiation packet first?
+     *
+     * @var bool
+     * @access private
+     */
+    var $send_kex_first = true;
+
+    /**
+     * Some versions of OpenSSH incorrectly calculate the key size
+     *
+     * @var bool
+     * @access private
+     */
+    var $bad_key_size_fix = false;
+
+    /**
+     * The selected decryption algorithm
+     *
+     * @var string
+     * @access private
+     */
+    var $decrypt_algorithm = '';
+
+    /**
+     * Should we try to re-connect to re-establish keys?
+     *
+     * @var bool
+     * @access private
+     */
+    var $retry_connect = false;
+
+    /**
+     * Binary Packet Buffer
+     *
+     * @var string|false
+     * @access private
+     */
+    var $binary_packet_buffer = false;
+
+    /**
+     * Preferred Signature Format
+     *
+     * @var string|false
+     * @access private
+     */
+    var $preferred_signature_format = false;
+
+    /**
+     * Authentication Credentials
+     *
+     * @var array
+     * @access private
+     */
+    var $auth = array();
+
+    /**
+     * Default Constructor.
+     *
+     * $host can either be a string, representing the host, or a stream resource.
+     *
+     * @param mixed $host
+     * @param int $port
+     * @param int $timeout
+     * @see self::login()
+     * @return Net_SSH2
+     * @access public
+     */
+    function __construct($host, $port = 22, $timeout = 10)
+    {
+        // Include Math_BigInteger
+        // Used to do Diffie-Hellman key exchange and DSA/RSA signature verification.
+        if (!class_exists('Math_BigInteger')) {
+            include_once 'Math/BigInteger.php';
+        }
+
+        if (!function_exists('crypt_random_string')) {
+            include_once 'Crypt/Random.php';
+        }
+
+        if (!class_exists('Crypt_Hash')) {
+            include_once 'Crypt/Hash.php';
+        }
+
+        // include Crypt_Base so constants can be defined for setCryptoEngine()
+        if (!class_exists('Crypt_Base')) {
+            include_once 'Crypt/Base.php';
+        }
+
+        $this->message_numbers = array(
+            1 => 'NET_SSH2_MSG_DISCONNECT',
+            2 => 'NET_SSH2_MSG_IGNORE',
+            3 => 'NET_SSH2_MSG_UNIMPLEMENTED',
+            4 => 'NET_SSH2_MSG_DEBUG',
+            5 => 'NET_SSH2_MSG_SERVICE_REQUEST',
+            6 => 'NET_SSH2_MSG_SERVICE_ACCEPT',
+            20 => 'NET_SSH2_MSG_KEXINIT',
+            21 => 'NET_SSH2_MSG_NEWKEYS',
+            30 => 'NET_SSH2_MSG_KEXDH_INIT',
+            31 => 'NET_SSH2_MSG_KEXDH_REPLY',
+            50 => 'NET_SSH2_MSG_USERAUTH_REQUEST',
+            51 => 'NET_SSH2_MSG_USERAUTH_FAILURE',
+            52 => 'NET_SSH2_MSG_USERAUTH_SUCCESS',
+            53 => 'NET_SSH2_MSG_USERAUTH_BANNER',
+
+            80 => 'NET_SSH2_MSG_GLOBAL_REQUEST',
+            81 => 'NET_SSH2_MSG_REQUEST_SUCCESS',
+            82 => 'NET_SSH2_MSG_REQUEST_FAILURE',
+            90 => 'NET_SSH2_MSG_CHANNEL_OPEN',
+            91 => 'NET_SSH2_MSG_CHANNEL_OPEN_CONFIRMATION',
+            92 => 'NET_SSH2_MSG_CHANNEL_OPEN_FAILURE',
+            93 => 'NET_SSH2_MSG_CHANNEL_WINDOW_ADJUST',
+            94 => 'NET_SSH2_MSG_CHANNEL_DATA',
+            95 => 'NET_SSH2_MSG_CHANNEL_EXTENDED_DATA',
+            96 => 'NET_SSH2_MSG_CHANNEL_EOF',
+            97 => 'NET_SSH2_MSG_CHANNEL_CLOSE',
+            98 => 'NET_SSH2_MSG_CHANNEL_REQUEST',
+            99 => 'NET_SSH2_MSG_CHANNEL_SUCCESS',
+            100 => 'NET_SSH2_MSG_CHANNEL_FAILURE'
+        );
+        $this->disconnect_reasons = array(
+            1 => 'NET_SSH2_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT',
+            2 => 'NET_SSH2_DISCONNECT_PROTOCOL_ERROR',
+            3 => 'NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED',
+            4 => 'NET_SSH2_DISCONNECT_RESERVED',
+            5 => 'NET_SSH2_DISCONNECT_MAC_ERROR',
+            6 => 'NET_SSH2_DISCONNECT_COMPRESSION_ERROR',
+            7 => 'NET_SSH2_DISCONNECT_SERVICE_NOT_AVAILABLE',
+            8 => 'NET_SSH2_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED',
+            9 => 'NET_SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE',
+            10 => 'NET_SSH2_DISCONNECT_CONNECTION_LOST',
+            11 => 'NET_SSH2_DISCONNECT_BY_APPLICATION',
+            12 => 'NET_SSH2_DISCONNECT_TOO_MANY_CONNECTIONS',
+            13 => 'NET_SSH2_DISCONNECT_AUTH_CANCELLED_BY_USER',
+            14 => 'NET_SSH2_DISCONNECT_NO_MORE_AUTH_METHODS_AVAILABLE',
+            15 => 'NET_SSH2_DISCONNECT_ILLEGAL_USER_NAME'
+        );
+        $this->channel_open_failure_reasons = array(
+            1 => 'NET_SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED'
+        );
+        $this->terminal_modes = array(
+            0 => 'NET_SSH2_TTY_OP_END'
+        );
+        $this->channel_extended_data_type_codes = array(
+            1 => 'NET_SSH2_EXTENDED_DATA_STDERR'
+        );
+
+        $this->_define_array(
+            $this->message_numbers,
+            $this->disconnect_reasons,
+            $this->channel_open_failure_reasons,
+            $this->terminal_modes,
+            $this->channel_extended_data_type_codes,
+            array(60 => 'NET_SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ'),
+            array(60 => 'NET_SSH2_MSG_USERAUTH_PK_OK'),
+            array(60 => 'NET_SSH2_MSG_USERAUTH_INFO_REQUEST',
+                  61 => 'NET_SSH2_MSG_USERAUTH_INFO_RESPONSE'),
+            // RFC 4419 - diffie-hellman-group-exchange-sha{1,256}
+            array(30 => 'NET_SSH2_MSG_KEXDH_GEX_REQUEST_OLD',
+                  31 => 'NET_SSH2_MSG_KEXDH_GEX_GROUP',
+                  32 => 'NET_SSH2_MSG_KEXDH_GEX_INIT',
+                  33 => 'NET_SSH2_MSG_KEXDH_GEX_REPLY',
+                  34 => 'NET_SSH2_MSG_KEXDH_GEX_REQUEST')
+        );
+
+        if (is_resource($host)) {
+            $this->fsock = $host;
+            return;
+        }
+
+        if (is_string($host)) {
+            $this->host = $host;
+            $this->port = $port;
+            $this->timeout = $timeout;
+        }
+    }
+
+    /**
+     * PHP4 compatible Default Constructor.
+     *
+     * @see self::__construct()
+     * @param mixed $host
+     * @param int $port
+     * @param int $timeout
+     * @access public
+     */
+    function Net_SSH2($host, $port = 22, $timeout = 10)
+    {
+        $this->__construct($host, $port, $timeout);
+    }
+
+    /**
+     * Set Crypto Engine Mode
+     *
+     * Possible $engine values:
+     * CRYPT_MODE_INTERNAL, CRYPT_MODE_MCRYPT
+     *
+     * @param int $engine
+     * @access public
+     */
+    function setCryptoEngine($engine)
+    {
+        $this->crypto_engine = $engine;
+    }
+
+    /**
+     * Send Identification String First
+     *
+     * https://tools.ietf.org/html/rfc4253#section-4.2 says "when the connection has been established,
+     * both sides MUST send an identification string". It does not say which side sends it first. In
+     * theory it shouldn't matter but it is a fact of life that some SSH servers are simply buggy
+     *
+     * @access public
+     */
+    function sendIdentificationStringFirst()
+    {
+        $this->send_id_string_first = true;
+    }
+
+    /**
+     * Send Identification String Last
+     *
+     * https://tools.ietf.org/html/rfc4253#section-4.2 says "when the connection has been established,
+     * both sides MUST send an identification string". It does not say which side sends it first. In
+     * theory it shouldn't matter but it is a fact of life that some SSH servers are simply buggy
+     *
+     * @access public
+     */
+    function sendIdentificationStringLast()
+    {
+        $this->send_id_string_first = false;
+    }
+
+    /**
+     * Send SSH_MSG_KEXINIT First
+     *
+     * https://tools.ietf.org/html/rfc4253#section-7.1 says "key exchange begins by each sending
+     * sending the [SSH_MSG_KEXINIT] packet". It does not say which side sends it first. In theory
+     * it shouldn't matter but it is a fact of life that some SSH servers are simply buggy
+     *
+     * @access public
+     */
+    function sendKEXINITFirst()
+    {
+        $this->send_kex_first = true;
+    }
+
+    /**
+     * Send SSH_MSG_KEXINIT Last
+     *
+     * https://tools.ietf.org/html/rfc4253#section-7.1 says "key exchange begins by each sending
+     * sending the [SSH_MSG_KEXINIT] packet". It does not say which side sends it first. In theory
+     * it shouldn't matter but it is a fact of life that some SSH servers are simply buggy
+     *
+     * @access public
+     */
+    function sendKEXINITLast()
+    {
+        $this->send_kex_first = false;
+    }
+
+    /**
+     * Connect to an SSHv2 server
+     *
+     * @return bool
+     * @access private
+     */
+    function _connect()
+    {
+        if ($this->bitmap & NET_SSH2_MASK_CONSTRUCTOR) {
+            return false;
+        }
+
+        $this->bitmap |= NET_SSH2_MASK_CONSTRUCTOR;
+
+        $this->curTimeout = $this->timeout;
+
+        $this->last_packet = strtok(microtime(), ' ') + strtok(''); // == microtime(true) in PHP5
+
+        if (!is_resource($this->fsock)) {
+            $start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838
+            // with stream_select a timeout of 0 means that no timeout takes place;
+            // with fsockopen a timeout of 0 means that you instantly timeout
+            // to resolve this incompatibility a timeout of 100,000 will be used for fsockopen if timeout is 0
+            $this->fsock = @fsockopen($this->host, $this->port, $errno, $errstr, $this->curTimeout == 0 ? 100000 : $this->curTimeout);
+            if (!$this->fsock) {
+                $host = $this->host . ':' . $this->port;
+                user_error(rtrim("Cannot connect to $host. Error $errno. $errstr"));
+                return false;
+            }
+            $elapsed = strtok(microtime(), ' ') + strtok('') - $start;
+
+            if ($this->curTimeout) {
+                $this->curTimeout-= $elapsed;
+                if ($this->curTimeout < 0) {
+                    $this->is_timeout = true;
+                    return false;
+                }
+            }
+        }
+
+        $this->identifier = $this->_generate_identifier();
+
+        if ($this->send_id_string_first) {
+            fputs($this->fsock, $this->identifier . "\r\n");
+        }
+
+        /* According to the SSH2 specs,
+
+          "The server MAY send other lines of data before sending the version
+           string.  Each line SHOULD be terminated by a Carriage Return and Line
+           Feed.  Such lines MUST NOT begin with "SSH-", and SHOULD be encoded
+           in ISO-10646 UTF-8 [RFC3629] (language is not specified).  Clients
+           MUST be able to process such lines." */
+        $temp = '';
+        $extra = '';
+        while (!feof($this->fsock) && !preg_match('#^SSH-(\d\.\d+)#', $temp, $matches)) {
+            if (substr($temp, -2) == "\r\n") {
+                $extra.= $temp;
+                $temp = '';
+            }
+
+            if ($this->curTimeout) {
+                if ($this->curTimeout < 0) {
+                    $this->is_timeout = true;
+                    return false;
+                }
+                $read = array($this->fsock);
+                $write = $except = null;
+                $start = strtok(microtime(), ' ') + strtok('');
+                $sec = floor($this->curTimeout);
+                $usec = 1000000 * ($this->curTimeout - $sec);
+                // on windows this returns a "Warning: Invalid CRT parameters detected" error
+                // the !count() is done as a workaround for <https://bugs.php.net/42682>
+                if (!@stream_select($read, $write, $except, $sec, $usec) && !count($read)) {
+                    $this->is_timeout = true;
+                    return false;
+                }
+                $elapsed = strtok(microtime(), ' ') + strtok('') - $start;
+                $this->curTimeout-= $elapsed;
+            }
+
+            $temp.= fgets($this->fsock, 255);
+        }
+
+        if (feof($this->fsock)) {
+            $this->bitmap = 0;
+            user_error('Connection closed by server');
+            return false;
+        }
+
+        if (defined('NET_SSH2_LOGGING')) {
+            $this->_append_log('<-', $extra . $temp);
+            $this->_append_log('->', $this->identifier . "\r\n");
+        }
+
+        $this->server_identifier = trim($temp, "\r\n");
+        if (strlen($extra)) {
+            $this->errors[] = $extra;
+        }
+
+        if (version_compare($matches[1], '1.99', '<')) {
+            user_error("Cannot connect to SSH $matches[1] servers");
+            return false;
+        }
+
+        if (!$this->send_id_string_first) {
+            fputs($this->fsock, $this->identifier . "\r\n");
+        }
+
+        if (!$this->send_kex_first) {
+            $response = $this->_get_binary_packet();
+            if ($response === false) {
+                $this->bitmap = 0;
+                user_error('Connection closed by server');
+                return false;
+            }
+
+            if (!strlen($response) || ord($response[0]) != NET_SSH2_MSG_KEXINIT) {
+                user_error('Expected SSH_MSG_KEXINIT');
+                return false;
+            }
+
+            if (!$this->_key_exchange($response)) {
+                return false;
+            }
+        }
+
+        if ($this->send_kex_first && !$this->_key_exchange()) {
+            return false;
+        }
+
+        $this->bitmap|= NET_SSH2_MASK_CONNECTED;
+
+        return true;
+    }
+
+    /**
+     * Generates the SSH identifier
+     *
+     * You should overwrite this method in your own class if you want to use another identifier
+     *
+     * @access protected
+     * @return string
+     */
+    function _generate_identifier()
+    {
+        $identifier = 'SSH-2.0-phpseclib_1.0';
+
+        $ext = array();
+        if (extension_loaded('openssl')) {
+            $ext[] = 'openssl';
+        } elseif (extension_loaded('mcrypt')) {
+            $ext[] = 'mcrypt';
+        }
+
+        if (extension_loaded('gmp')) {
+            $ext[] = 'gmp';
+        } elseif (extension_loaded('bcmath')) {
+            $ext[] = 'bcmath';
+        }
+
+        if (!empty($ext)) {
+            $identifier .= ' (' . implode(', ', $ext) . ')';
+        }
+
+        return $identifier;
+    }
+
+    /**
+     * Key Exchange
+     *
+     * @param string $kexinit_payload_server optional
+     * @access private
+     */
+    function _key_exchange($kexinit_payload_server = false)
+    {
+        static $kex_algorithms = array(
+            'diffie-hellman-group1-sha1', // REQUIRED
+            'diffie-hellman-group14-sha1', // REQUIRED
+            'diffie-hellman-group-exchange-sha1', // RFC 4419
+            'diffie-hellman-group-exchange-sha256', // RFC 4419
+        );
+
+        static $server_host_key_algorithms = array(
+            'rsa-sha2-256', // RFC 8332
+            'rsa-sha2-512', // RFC 8332
+            'ssh-rsa', // RECOMMENDED  sign   Raw RSA Key
+            'ssh-dss'  // REQUIRED     sign   Raw DSS Key
+        );
+
+        static $encryption_algorithms = false;
+        if ($encryption_algorithms === false) {
+            $encryption_algorithms = array(
+                // from <http://tools.ietf.org/html/rfc4345#section-4>:
+                'arcfour256',
+                'arcfour128',
+
+                //'arcfour',      // OPTIONAL          the ARCFOUR stream cipher with a 128-bit key
+
+                // CTR modes from <http://tools.ietf.org/html/rfc4344#section-4>:
+                'aes128-ctr',     // RECOMMENDED       AES (Rijndael) in SDCTR mode, with 128-bit key
+                'aes192-ctr',     // RECOMMENDED       AES with 192-bit key
+                'aes256-ctr',     // RECOMMENDED       AES with 256-bit key
+
+                'twofish128-ctr', // OPTIONAL          Twofish in SDCTR mode, with 128-bit key
+                'twofish192-ctr', // OPTIONAL          Twofish with 192-bit key
+                'twofish256-ctr', // OPTIONAL          Twofish with 256-bit key
+
+                'aes128-cbc',     // RECOMMENDED       AES with a 128-bit key
+                'aes192-cbc',     // OPTIONAL          AES with a 192-bit key
+                'aes256-cbc',     // OPTIONAL          AES in CBC mode, with a 256-bit key
+
+                'twofish128-cbc', // OPTIONAL          Twofish with a 128-bit key
+                'twofish192-cbc', // OPTIONAL          Twofish with a 192-bit key
+                'twofish256-cbc',
+                'twofish-cbc',    // OPTIONAL          alias for "twofish256-cbc"
+                                  //                   (this is being retained for historical reasons)
+
+                'blowfish-ctr',   // OPTIONAL          Blowfish in SDCTR mode
+
+                'blowfish-cbc',   // OPTIONAL          Blowfish in CBC mode
+
+                '3des-ctr',       // RECOMMENDED       Three-key 3DES in SDCTR mode
+
+                '3des-cbc',       // REQUIRED          three-key 3DES in CBC mode
+                 //'none'         // OPTIONAL          no encryption; NOT RECOMMENDED
+            );
+
+            if (extension_loaded('openssl') && !extension_loaded('mcrypt')) {
+                // OpenSSL does not support arcfour256 in any capacity and arcfour128 / arcfour support is limited to
+                // instances that do not use continuous buffers
+                $encryption_algorithms = array_diff(
+                    $encryption_algorithms,
+                    array('arcfour256', 'arcfour128', 'arcfour')
+                );
+            }
+
+            if (phpseclib_resolve_include_path('Crypt/RC4.php') === false) {
+                $encryption_algorithms = array_diff(
+                    $encryption_algorithms,
+                    array('arcfour256', 'arcfour128', 'arcfour')
+                );
+            }
+            if (phpseclib_resolve_include_path('Crypt/Rijndael.php') === false) {
+                $encryption_algorithms = array_diff(
+                    $encryption_algorithms,
+                    array('aes128-ctr', 'aes192-ctr', 'aes256-ctr', 'aes128-cbc', 'aes192-cbc', 'aes256-cbc')
+                );
+            }
+            if (phpseclib_resolve_include_path('Crypt/Twofish.php') === false) {
+                $encryption_algorithms = array_diff(
+                    $encryption_algorithms,
+                    array('twofish128-ctr', 'twofish192-ctr', 'twofish256-ctr', 'twofish128-cbc', 'twofish192-cbc', 'twofish256-cbc', 'twofish-cbc')
+                );
+            }
+            if (phpseclib_resolve_include_path('Crypt/Blowfish.php') === false) {
+                $encryption_algorithms = array_diff(
+                    $encryption_algorithms,
+                    array('blowfish-ctr', 'blowfish-cbc')
+                );
+            }
+            if (phpseclib_resolve_include_path('Crypt/TripleDES.php') === false) {
+                $encryption_algorithms = array_diff(
+                    $encryption_algorithms,
+                    array('3des-ctr', '3des-cbc')
+                );
+            }
+            $encryption_algorithms = array_values($encryption_algorithms);
+        }
+
+        $mac_algorithms = array(
+            // from <http://www.ietf.org/rfc/rfc6668.txt>:
+            'hmac-sha2-256',// RECOMMENDED     HMAC-SHA256 (digest length = key length = 32)
+
+            'hmac-sha1-96', // RECOMMENDED     first 96 bits of HMAC-SHA1 (digest length = 12, key length = 20)
+            'hmac-sha1',    // REQUIRED        HMAC-SHA1 (digest length = key length = 20)
+            'hmac-md5-96',  // OPTIONAL        first 96 bits of HMAC-MD5 (digest length = 12, key length = 16)
+            'hmac-md5',     // OPTIONAL        HMAC-MD5 (digest length = key length = 16)
+            //'none'          // OPTIONAL        no MAC; NOT RECOMMENDED
+        );
+
+        static $compression_algorithms = array(
+            'none'   // REQUIRED        no compression
+            //'zlib' // OPTIONAL        ZLIB (LZ77) compression
+        );
+
+        // some SSH servers have buggy implementations of some of the above algorithms
+        switch (true) {
+            case $this->server_identifier == 'SSH-2.0-SSHD':
+            case substr($this->server_identifier, 0, 13) == 'SSH-2.0-DLINK':
+                $mac_algorithms = array_values(array_diff(
+                    $mac_algorithms,
+                    array('hmac-sha1-96', 'hmac-md5-96')
+                ));
+        }
+
+        static $str_kex_algorithms, $str_server_host_key_algorithms,
+               $encryption_algorithms_server_to_client, $mac_algorithms_server_to_client, $compression_algorithms_server_to_client,
+               $encryption_algorithms_client_to_server, $mac_algorithms_client_to_server, $compression_algorithms_client_to_server;
+
+        if (empty($str_kex_algorithms)) {
+            $str_kex_algorithms = implode(',', $kex_algorithms);
+            $str_server_host_key_algorithms = implode(',', $server_host_key_algorithms);
+            $encryption_algorithms_server_to_client = $encryption_algorithms_client_to_server = implode(',', $encryption_algorithms);
+            $mac_algorithms_server_to_client = $mac_algorithms_client_to_server = implode(',', $mac_algorithms);
+            $compression_algorithms_server_to_client = $compression_algorithms_client_to_server = implode(',', $compression_algorithms);
+        }
+
+        $client_cookie = crypt_random_string(16);
+
+        $kexinit_payload_client = pack(
+            'Ca*Na*Na*Na*Na*Na*Na*Na*Na*Na*Na*CN',
+            NET_SSH2_MSG_KEXINIT,
+            $client_cookie,
+            strlen($str_kex_algorithms),
+            $str_kex_algorithms,
+            strlen($str_server_host_key_algorithms),
+            $str_server_host_key_algorithms,
+            strlen($encryption_algorithms_client_to_server),
+            $encryption_algorithms_client_to_server,
+            strlen($encryption_algorithms_server_to_client),
+            $encryption_algorithms_server_to_client,
+            strlen($mac_algorithms_client_to_server),
+            $mac_algorithms_client_to_server,
+            strlen($mac_algorithms_server_to_client),
+            $mac_algorithms_server_to_client,
+            strlen($compression_algorithms_client_to_server),
+            $compression_algorithms_client_to_server,
+            strlen($compression_algorithms_server_to_client),
+            $compression_algorithms_server_to_client,
+            0,
+            '',
+            0,
+            '',
+            0,
+            0
+        );
+
+        if ($this->send_kex_first) {
+            if (!$this->_send_binary_packet($kexinit_payload_client)) {
+                return false;
+            }
+
+            $kexinit_payload_server = $this->_get_binary_packet();
+            if ($kexinit_payload_server === false) {
+                $this->bitmap = 0;
+                user_error('Connection closed by server');
+                return false;
+            }
+
+            if (!strlen($kexinit_payload_server) || ord($kexinit_payload_server[0]) != NET_SSH2_MSG_KEXINIT) {
+                user_error('Expected SSH_MSG_KEXINIT');
+                return false;
+            }
+        }
+
+        $response = $kexinit_payload_server;
+        $this->_string_shift($response, 1); // skip past the message number (it should be SSH_MSG_KEXINIT)
+        $server_cookie = $this->_string_shift($response, 16);
+
+        if (strlen($response) < 4) {
+            return false;
+        }
+        $temp = unpack('Nlength', $this->_string_shift($response, 4));
+        $this->kex_algorithms = explode(',', $this->_string_shift($response, $temp['length']));
+
+        if (strlen($response) < 4) {
+            return false;
+        }
+        $temp = unpack('Nlength', $this->_string_shift($response, 4));
+        $this->server_host_key_algorithms = explode(',', $this->_string_shift($response, $temp['length']));
+
+        if (strlen($response) < 4) {
+            return false;
+        }
+        $temp = unpack('Nlength', $this->_string_shift($response, 4));
+        $this->encryption_algorithms_client_to_server = explode(',', $this->_string_shift($response, $temp['length']));
+
+        if (strlen($response) < 4) {
+            return false;
+        }
+        $temp = unpack('Nlength', $this->_string_shift($response, 4));
+        $this->encryption_algorithms_server_to_client = explode(',', $this->_string_shift($response, $temp['length']));
+
+        if (strlen($response) < 4) {
+            return false;
+        }
+        $temp = unpack('Nlength', $this->_string_shift($response, 4));
+        $this->mac_algorithms_client_to_server = explode(',', $this->_string_shift($response, $temp['length']));
+
+        if (strlen($response) < 4) {
+            return false;
+        }
+        $temp = unpack('Nlength', $this->_string_shift($response, 4));
+        $this->mac_algorithms_server_to_client = explode(',', $this->_string_shift($response, $temp['length']));
+
+        if (strlen($response) < 4) {
+            return false;
+        }
+        $temp = unpack('Nlength', $this->_string_shift($response, 4));
+        $this->compression_algorithms_client_to_server = explode(',', $this->_string_shift($response, $temp['length']));
+
+        if (strlen($response) < 4) {
+            return false;
+        }
+        $temp = unpack('Nlength', $this->_string_shift($response, 4));
+        $this->compression_algorithms_server_to_client = explode(',', $this->_string_shift($response, $temp['length']));
+
+        if (strlen($response) < 4) {
+            return false;
+        }
+        $temp = unpack('Nlength', $this->_string_shift($response, 4));
+        $this->languages_client_to_server = explode(',', $this->_string_shift($response, $temp['length']));
+
+        if (strlen($response) < 4) {
+            return false;
+        }
+        $temp = unpack('Nlength', $this->_string_shift($response, 4));
+        $this->languages_server_to_client = explode(',', $this->_string_shift($response, $temp['length']));
+
+        if (!strlen($response)) {
+            return false;
+        }
+        extract(unpack('Cfirst_kex_packet_follows', $this->_string_shift($response, 1)));
+        $first_kex_packet_follows = $first_kex_packet_follows != 0;
+
+        if (!$this->send_kex_first && !$this->_send_binary_packet($kexinit_payload_client)) {
+            return false;
+        }
+
+        // we need to decide upon the symmetric encryption algorithms before we do the diffie-hellman key exchange
+        // we don't initialize any crypto-objects, yet - we do that, later. for now, we need the lengths to make the
+        // diffie-hellman key exchange as fast as possible
+        $decrypt = $this->_array_intersect_first($encryption_algorithms, $this->encryption_algorithms_server_to_client);
+        $decryptKeyLength = $this->_encryption_algorithm_to_key_size($decrypt);
+        if ($decryptKeyLength === null) {
+            user_error('No compatible server to client encryption algorithms found');
+            return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
+        }
+
+        $encrypt = $this->_array_intersect_first($encryption_algorithms, $this->encryption_algorithms_client_to_server);
+        $encryptKeyLength = $this->_encryption_algorithm_to_key_size($encrypt);
+        if ($encryptKeyLength === null) {
+            user_error('No compatible client to server encryption algorithms found');
+            return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
+        }
+
+        $keyLength = $decryptKeyLength > $encryptKeyLength ? $decryptKeyLength : $encryptKeyLength;
+
+        // through diffie-hellman key exchange a symmetric key is obtained
+        $kex_algorithm = $this->_array_intersect_first($kex_algorithms, $this->kex_algorithms);
+        if ($kex_algorithm === false) {
+            user_error('No compatible key exchange algorithms found');
+            return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
+        }
+        if (strpos($kex_algorithm, 'diffie-hellman-group-exchange') === 0) {
+            $dh_group_sizes_packed = pack(
+                'NNN',
+                $this->kex_dh_group_size_min,
+                $this->kex_dh_group_size_preferred,
+                $this->kex_dh_group_size_max
+            );
+            $packet = pack(
+                'Ca*',
+                NET_SSH2_MSG_KEXDH_GEX_REQUEST,
+                $dh_group_sizes_packed
+            );
+            if (!$this->_send_binary_packet($packet)) {
+                return false;
+            }
+
+            $response = $this->_get_binary_packet();
+            if ($response === false) {
+                $this->bitmap = 0;
+                user_error('Connection closed by server');
+                return false;
+            }
+            if (!strlen($response)) {
+                return false;
+            }
+            extract(unpack('Ctype', $this->_string_shift($response, 1)));
+            if ($type != NET_SSH2_MSG_KEXDH_GEX_GROUP) {
+                user_error('Expected SSH_MSG_KEX_DH_GEX_GROUP');
+                return false;
+            }
+
+            if (strlen($response) < 4) {
+                return false;
+            }
+            extract(unpack('NprimeLength', $this->_string_shift($response, 4)));
+            $primeBytes = $this->_string_shift($response, $primeLength);
+            $prime = new Math_BigInteger($primeBytes, -256);
+
+            if (strlen($response) < 4) {
+                return false;
+            }
+            extract(unpack('NgLength', $this->_string_shift($response, 4)));
+            $gBytes = $this->_string_shift($response, $gLength);
+            $g = new Math_BigInteger($gBytes, -256);
+
+            $exchange_hash_rfc4419 = pack(
+                'a*Na*Na*',
+                $dh_group_sizes_packed,
+                $primeLength,
+                $primeBytes,
+                $gLength,
+                $gBytes
+            );
+
+            $clientKexInitMessage = NET_SSH2_MSG_KEXDH_GEX_INIT;
+            $serverKexReplyMessage = NET_SSH2_MSG_KEXDH_GEX_REPLY;
+        } else {
+            switch ($kex_algorithm) {
+                // see http://tools.ietf.org/html/rfc2409#section-6.2 and
+                // http://tools.ietf.org/html/rfc2412, appendex E
+                case 'diffie-hellman-group1-sha1':
+                    $prime = 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74' .
+                            '020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F1437' .
+                            '4FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED' .
+                            'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF';
+                    break;
+                // see http://tools.ietf.org/html/rfc3526#section-3
+                case 'diffie-hellman-group14-sha1':
+                    $prime = 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74' .
+                            '020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F1437' .
+                            '4FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED' .
+                            'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3DC2007CB8A163BF05' .
+                            '98DA48361C55D39A69163FA8FD24CF5F83655D23DCA3AD961C62F356208552BB' .
+                            '9ED529077096966D670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B' .
+                            'E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9DE2BCBF695581718' .
+                            '3995497CEA956AE515D2261898FA051015728E5A8AACAA68FFFFFFFFFFFFFFFF';
+                    break;
+            }
+            // For both diffie-hellman-group1-sha1 and diffie-hellman-group14-sha1
+            // the generator field element is 2 (decimal) and the hash function is sha1.
+            $g = new Math_BigInteger(2);
+            $prime = new Math_BigInteger($prime, 16);
+            $exchange_hash_rfc4419 = '';
+            $clientKexInitMessage = NET_SSH2_MSG_KEXDH_INIT;
+            $serverKexReplyMessage = NET_SSH2_MSG_KEXDH_REPLY;
+        }
+
+        switch ($kex_algorithm) {
+            case 'diffie-hellman-group-exchange-sha256':
+                $kexHash = new Crypt_Hash('sha256');
+                break;
+            default:
+                $kexHash = new Crypt_Hash('sha1');
+        }
+
+        /* To increase the speed of the key exchange, both client and server may
+           reduce the size of their private exponents.  It should be at least
+           twice as long as the key material that is generated from the shared
+           secret.  For more details, see the paper by van Oorschot and Wiener
+           [VAN-OORSCHOT].
+
+           -- http://tools.ietf.org/html/rfc4419#section-6.2 */
+        $one = new Math_BigInteger(1);
+        $keyLength = min($keyLength, $kexHash->getLength());
+        $max = $one->bitwise_leftShift(16 * $keyLength); // 2 * 8 * $keyLength
+        $max = $max->subtract($one);
+
+        $x = $one->random($one, $max);
+        $e = $g->modPow($x, $prime);
+
+        $eBytes = $e->toBytes(true);
+        $data = pack('CNa*', $clientKexInitMessage, strlen($eBytes), $eBytes);
+
+        if (!$this->_send_binary_packet($data)) {
+            $this->bitmap = 0;
+            user_error('Connection closed by server');
+            return false;
+        }
+
+        $response = $this->_get_binary_packet();
+        if ($response === false) {
+            $this->bitmap = 0;
+            user_error('Connection closed by server');
+            return false;
+        }
+        if (!strlen($response)) {
+            return false;
+        }
+        extract(unpack('Ctype', $this->_string_shift($response, 1)));
+
+        if ($type != $serverKexReplyMessage) {
+            user_error('Expected SSH_MSG_KEXDH_REPLY');
+            return false;
+        }
+
+        if (strlen($response) < 4) {
+            return false;
+        }
+        $temp = unpack('Nlength', $this->_string_shift($response, 4));
+        $this->server_public_host_key = $server_public_host_key = $this->_string_shift($response, $temp['length']);
+
+        if (strlen($server_public_host_key) < 4) {
+            return false;
+        }
+        $temp = unpack('Nlength', $this->_string_shift($server_public_host_key, 4));
+        $public_key_format = $this->_string_shift($server_public_host_key, $temp['length']);
+
+        if (strlen($response) < 4) {
+            return false;
+        }
+        $temp = unpack('Nlength', $this->_string_shift($response, 4));
+        $fBytes = $this->_string_shift($response, $temp['length']);
+        $f = new Math_BigInteger($fBytes, -256);
+
+        if (strlen($response) < 4) {
+            return false;
+        }
+        $temp = unpack('Nlength', $this->_string_shift($response, 4));
+        $this->signature = $this->_string_shift($response, $temp['length']);
+
+        if (strlen($this->signature) < 4) {
+            return false;
+        }
+        $temp = unpack('Nlength', $this->_string_shift($this->signature, 4));
+        $this->signature_format = $this->_string_shift($this->signature, $temp['length']);
+
+        $key = $f->modPow($x, $prime);
+        $keyBytes = $key->toBytes(true);
+
+        $this->exchange_hash = pack(
+            'Na*Na*Na*Na*Na*a*Na*Na*Na*',
+            strlen($this->identifier),
+            $this->identifier,
+            strlen($this->server_identifier),
+            $this->server_identifier,
+            strlen($kexinit_payload_client),
+            $kexinit_payload_client,
+            strlen($kexinit_payload_server),
+            $kexinit_payload_server,
+            strlen($this->server_public_host_key),
+            $this->server_public_host_key,
+            $exchange_hash_rfc4419,
+            strlen($eBytes),
+            $eBytes,
+            strlen($fBytes),
+            $fBytes,
+            strlen($keyBytes),
+            $keyBytes
+        );
+
+        $this->exchange_hash = $kexHash->hash($this->exchange_hash);
+
+        if ($this->session_id === false) {
+            $this->session_id = $this->exchange_hash;
+        }
+
+        $server_host_key_algorithm = $this->_array_intersect_first($server_host_key_algorithms, $this->server_host_key_algorithms);
+        if ($server_host_key_algorithm === false) {
+            user_error('No compatible server host key algorithms found');
+            return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
+        }
+
+        switch ($server_host_key_algorithm) {
+            case 'ssh-dss':
+                $expected_key_format = 'ssh-dss';
+                break;
+            //case 'rsa-sha2-256':
+            //case 'rsa-sha2-512':
+            //case 'ssh-rsa':
+            default:
+                $expected_key_format = 'ssh-rsa';
+        }
+
+        if ($public_key_format != $expected_key_format || $this->signature_format != $server_host_key_algorithm) {
+            user_error('Server Host Key Algorithm Mismatch');
+            return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
+        }
+
+        $packet = pack(
+            'C',
+            NET_SSH2_MSG_NEWKEYS
+        );
+
+        if (!$this->_send_binary_packet($packet)) {
+            return false;
+        }
+
+        $response = $this->_get_binary_packet();
+
+        if ($response === false) {
+            $this->bitmap = 0;
+            user_error('Connection closed by server');
+            return false;
+        }
+
+        if (!strlen($response)) {
+            return false;
+        }
+        extract(unpack('Ctype', $this->_string_shift($response, 1)));
+
+        if ($type != NET_SSH2_MSG_NEWKEYS) {
+            user_error('Expected SSH_MSG_NEWKEYS');
+            return false;
+        }
+
+        switch ($encrypt) {
+            case '3des-cbc':
+                if (!class_exists('Crypt_TripleDES')) {
+                    include_once 'Crypt/TripleDES.php';
+                }
+                $this->encrypt = new Crypt_TripleDES();
+                // $this->encrypt_block_size = 64 / 8 == the default
+                break;
+            case '3des-ctr':
+                if (!class_exists('Crypt_TripleDES')) {
+                    include_once 'Crypt/TripleDES.php';
+                }
+                $this->encrypt = new Crypt_TripleDES(CRYPT_DES_MODE_CTR);
+                // $this->encrypt_block_size = 64 / 8 == the default
+                break;
+            case 'aes256-cbc':
+            case 'aes192-cbc':
+            case 'aes128-cbc':
+                if (!class_exists('Crypt_Rijndael')) {
+                    include_once 'Crypt/Rijndael.php';
+                }
+                $this->encrypt = new Crypt_Rijndael();
+                $this->encrypt_block_size = 16; // eg. 128 / 8
+                break;
+            case 'aes256-ctr':
+            case 'aes192-ctr':
+            case 'aes128-ctr':
+                if (!class_exists('Crypt_Rijndael')) {
+                    include_once 'Crypt/Rijndael.php';
+                }
+                $this->encrypt = new Crypt_Rijndael(CRYPT_RIJNDAEL_MODE_CTR);
+                $this->encrypt_block_size = 16; // eg. 128 / 8
+                break;
+            case 'blowfish-cbc':
+                if (!class_exists('Crypt_Blowfish')) {
+                    include_once 'Crypt/Blowfish.php';
+                }
+                $this->encrypt = new Crypt_Blowfish();
+                $this->encrypt_block_size = 8;
+                break;
+            case 'blowfish-ctr':
+                if (!class_exists('Crypt_Blowfish')) {
+                    include_once 'Crypt/Blowfish.php';
+                }
+                $this->encrypt = new Crypt_Blowfish(CRYPT_BLOWFISH_MODE_CTR);
+                $this->encrypt_block_size = 8;
+                break;
+            case 'twofish128-cbc':
+            case 'twofish192-cbc':
+            case 'twofish256-cbc':
+            case 'twofish-cbc':
+                if (!class_exists('Crypt_Twofish')) {
+                    include_once 'Crypt/Twofish.php';
+                }
+                $this->encrypt = new Crypt_Twofish();
+                $this->encrypt_block_size = 16;
+                break;
+            case 'twofish128-ctr':
+            case 'twofish192-ctr':
+            case 'twofish256-ctr':
+                if (!class_exists('Crypt_Twofish')) {
+                    include_once 'Crypt/Twofish.php';
+                }
+                $this->encrypt = new Crypt_Twofish(CRYPT_TWOFISH_MODE_CTR);
+                $this->encrypt_block_size = 16;
+                break;
+            case 'arcfour':
+            case 'arcfour128':
+            case 'arcfour256':
+                if (!class_exists('Crypt_RC4')) {
+                    include_once 'Crypt/RC4.php';
+                }
+                $this->encrypt = new Crypt_RC4();
+                break;
+            case 'none':
+                //$this->encrypt = new Crypt_Null();
+        }
+
+        switch ($decrypt) {
+            case '3des-cbc':
+                if (!class_exists('Crypt_TripleDES')) {
+                    include_once 'Crypt/TripleDES.php';
+                }
+                $this->decrypt = new Crypt_TripleDES();
+                break;
+            case '3des-ctr':
+                if (!class_exists('Crypt_TripleDES')) {
+                    include_once 'Crypt/TripleDES.php';
+                }
+                $this->decrypt = new Crypt_TripleDES(CRYPT_DES_MODE_CTR);
+                break;
+            case 'aes256-cbc':
+            case 'aes192-cbc':
+            case 'aes128-cbc':
+                if (!class_exists('Crypt_Rijndael')) {
+                    include_once 'Crypt/Rijndael.php';
+                }
+                $this->decrypt = new Crypt_Rijndael();
+                $this->decrypt_block_size = 16;
+                break;
+            case 'aes256-ctr':
+            case 'aes192-ctr':
+            case 'aes128-ctr':
+                if (!class_exists('Crypt_Rijndael')) {
+                    include_once 'Crypt/Rijndael.php';
+                }
+                $this->decrypt = new Crypt_Rijndael(CRYPT_RIJNDAEL_MODE_CTR);
+                $this->decrypt_block_size = 16;
+                break;
+            case 'blowfish-cbc':
+                if (!class_exists('Crypt_Blowfish')) {
+                    include_once 'Crypt/Blowfish.php';
+                }
+                $this->decrypt = new Crypt_Blowfish();
+                $this->decrypt_block_size = 8;
+                break;
+            case 'blowfish-ctr':
+                if (!class_exists('Crypt_Blowfish')) {
+                    include_once 'Crypt/Blowfish.php';
+                }
+                $this->decrypt = new Crypt_Blowfish(CRYPT_BLOWFISH_MODE_CTR);
+                $this->decrypt_block_size = 8;
+                break;
+            case 'twofish128-cbc':
+            case 'twofish192-cbc':
+            case 'twofish256-cbc':
+            case 'twofish-cbc':
+                if (!class_exists('Crypt_Twofish')) {
+                    include_once 'Crypt/Twofish.php';
+                }
+                $this->decrypt = new Crypt_Twofish();
+                $this->decrypt_block_size = 16;
+                break;
+            case 'twofish128-ctr':
+            case 'twofish192-ctr':
+            case 'twofish256-ctr':
+                if (!class_exists('Crypt_Twofish')) {
+                    include_once 'Crypt/Twofish.php';
+                }
+                $this->decrypt = new Crypt_Twofish(CRYPT_TWOFISH_MODE_CTR);
+                $this->decrypt_block_size = 16;
+                break;
+            case 'arcfour':
+            case 'arcfour128':
+            case 'arcfour256':
+                if (!class_exists('Crypt_RC4')) {
+                    include_once 'Crypt/RC4.php';
+                }
+                $this->decrypt = new Crypt_RC4();
+                break;
+            case 'none':
+                //$this->decrypt = new Crypt_Null();
+        }
+
+        $this->decrypt_algorithm = $decrypt;
+
+        $keyBytes = pack('Na*', strlen($keyBytes), $keyBytes);
+
+        if ($this->encrypt) {
+            if ($this->crypto_engine) {
+                $this->encrypt->setPreferredEngine($this->crypto_engine);
+            }
+            $this->encrypt->enableContinuousBuffer();
+            $this->encrypt->disablePadding();
+
+            $iv = $kexHash->hash($keyBytes . $this->exchange_hash . 'A' . $this->session_id);
+            while ($this->encrypt_block_size > strlen($iv)) {
+                $iv.= $kexHash->hash($keyBytes . $this->exchange_hash . $iv);
+            }
+            $this->encrypt->setIV(substr($iv, 0, $this->encrypt_block_size));
+
+            $key = $kexHash->hash($keyBytes . $this->exchange_hash . 'C' . $this->session_id);
+            while ($encryptKeyLength > strlen($key)) {
+                $key.= $kexHash->hash($keyBytes . $this->exchange_hash . $key);
+            }
+            $this->encrypt->setKey(substr($key, 0, $encryptKeyLength));
+        }
+
+        if ($this->decrypt) {
+            if ($this->crypto_engine) {
+                $this->decrypt->setPreferredEngine($this->crypto_engine);
+            }
+            $this->decrypt->enableContinuousBuffer();
+            $this->decrypt->disablePadding();
+
+            $iv = $kexHash->hash($keyBytes . $this->exchange_hash . 'B' . $this->session_id);
+            while ($this->decrypt_block_size > strlen($iv)) {
+                $iv.= $kexHash->hash($keyBytes . $this->exchange_hash . $iv);
+            }
+            $this->decrypt->setIV(substr($iv, 0, $this->decrypt_block_size));
+
+            $key = $kexHash->hash($keyBytes . $this->exchange_hash . 'D' . $this->session_id);
+            while ($decryptKeyLength > strlen($key)) {
+                $key.= $kexHash->hash($keyBytes . $this->exchange_hash . $key);
+            }
+            $this->decrypt->setKey(substr($key, 0, $decryptKeyLength));
+        }
+
+        /* The "arcfour128" algorithm is the RC4 cipher, as described in
+           [SCHNEIER], using a 128-bit key.  The first 1536 bytes of keystream
+           generated by the cipher MUST be discarded, and the first byte of the
+           first encrypted packet MUST be encrypted using the 1537th byte of
+           keystream.
+
+           -- http://tools.ietf.org/html/rfc4345#section-4 */
+        if ($encrypt == 'arcfour128' || $encrypt == 'arcfour256') {
+            $this->encrypt->encrypt(str_repeat("\0", 1536));
+        }
+        if ($decrypt == 'arcfour128' || $decrypt == 'arcfour256') {
+            $this->decrypt->decrypt(str_repeat("\0", 1536));
+        }
+
+        $mac_algorithm = $this->_array_intersect_first($mac_algorithms, $this->mac_algorithms_client_to_server);
+        if ($mac_algorithm === false) {
+            user_error('No compatible client to server message authentication algorithms found');
+            return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
+        }
+
+        $createKeyLength = 0; // ie. $mac_algorithm == 'none'
+        switch ($mac_algorithm) {
+            case 'hmac-sha2-256':
+                $this->hmac_create = new Crypt_Hash('sha256');
+                $createKeyLength = 32;
+                break;
+            case 'hmac-sha1':
+                $this->hmac_create = new Crypt_Hash('sha1');
+                $createKeyLength = 20;
+                break;
+            case 'hmac-sha1-96':
+                $this->hmac_create = new Crypt_Hash('sha1-96');
+                $createKeyLength = 20;
+                break;
+            case 'hmac-md5':
+                $this->hmac_create = new Crypt_Hash('md5');
+                $createKeyLength = 16;
+                break;
+            case 'hmac-md5-96':
+                $this->hmac_create = new Crypt_Hash('md5-96');
+                $createKeyLength = 16;
+        }
+
+        $mac_algorithm = $this->_array_intersect_first($mac_algorithms, $this->mac_algorithms_server_to_client);
+        if ($mac_algorithm === false) {
+            user_error('No compatible server to client message authentication algorithms found');
+            return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
+        }
+
+        $checkKeyLength = 0;
+        $this->hmac_size = 0;
+        switch ($mac_algorithm) {
+            case 'hmac-sha2-256':
+                $this->hmac_check = new Crypt_Hash('sha256');
+                $checkKeyLength = 32;
+                $this->hmac_size = 32;
+                break;
+            case 'hmac-sha1':
+                $this->hmac_check = new Crypt_Hash('sha1');
+                $checkKeyLength = 20;
+                $this->hmac_size = 20;
+                break;
+            case 'hmac-sha1-96':
+                $this->hmac_check = new Crypt_Hash('sha1-96');
+                $checkKeyLength = 20;
+                $this->hmac_size = 12;
+                break;
+            case 'hmac-md5':
+                $this->hmac_check = new Crypt_Hash('md5');
+                $checkKeyLength = 16;
+                $this->hmac_size = 16;
+                break;
+            case 'hmac-md5-96':
+                $this->hmac_check = new Crypt_Hash('md5-96');
+                $checkKeyLength = 16;
+                $this->hmac_size = 12;
+        }
+
+        $key = $kexHash->hash($keyBytes . $this->exchange_hash . 'E' . $this->session_id);
+        while ($createKeyLength > strlen($key)) {
+            $key.= $kexHash->hash($keyBytes . $this->exchange_hash . $key);
+        }
+        $this->hmac_create->setKey(substr($key, 0, $createKeyLength));
+
+        $key = $kexHash->hash($keyBytes . $this->exchange_hash . 'F' . $this->session_id);
+        while ($checkKeyLength > strlen($key)) {
+            $key.= $kexHash->hash($keyBytes . $this->exchange_hash . $key);
+        }
+        $this->hmac_check->setKey(substr($key, 0, $checkKeyLength));
+
+        $compression_algorithm = $this->_array_intersect_first($compression_algorithms, $this->compression_algorithms_server_to_client);
+        if ($compression_algorithm === false) {
+            user_error('No compatible server to client compression algorithms found');
+            return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
+        }
+        $this->decompress = $compression_algorithm == 'zlib';
+
+        $compression_algorithm = $this->_array_intersect_first($compression_algorithms, $this->compression_algorithms_client_to_server);
+        if ($compression_algorithm === false) {
+            user_error('No compatible client to server compression algorithms found');
+            return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
+        }
+        $this->compress = $compression_algorithm == 'zlib';
+
+        return true;
+    }
+
+    /**
+     * Maps an encryption algorithm name to the number of key bytes.
+     *
+     * @param string $algorithm Name of the encryption algorithm
+     * @return int|null Number of bytes as an integer or null for unknown
+     * @access private
+     */
+    function _encryption_algorithm_to_key_size($algorithm)
+    {
+        if ($this->bad_key_size_fix && $this->_bad_algorithm_candidate($algorithm)) {
+            return 16;
+        }
+
+        switch ($algorithm) {
+            case 'none':
+                return 0;
+            case 'aes128-cbc':
+            case 'aes128-ctr':
+            case 'arcfour':
+            case 'arcfour128':
+            case 'blowfish-cbc':
+            case 'blowfish-ctr':
+            case 'twofish128-cbc':
+            case 'twofish128-ctr':
+                return 16;
+            case '3des-cbc':
+            case '3des-ctr':
+            case 'aes192-cbc':
+            case 'aes192-ctr':
+            case 'twofish192-cbc':
+            case 'twofish192-ctr':
+                return 24;
+            case 'aes256-cbc':
+            case 'aes256-ctr':
+            case 'arcfour256':
+            case 'twofish-cbc':
+            case 'twofish256-cbc':
+            case 'twofish256-ctr':
+                return 32;
+        }
+        return null;
+    }
+
+    /**
+     * Tests whether or not proposed algorithm has a potential for issues
+     *
+     * @link https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/ssh2-aesctr-openssh.html
+     * @link https://bugzilla.mindrot.org/show_bug.cgi?id=1291
+     * @param string $algorithm Name of the encryption algorithm
+     * @return bool
+     * @access private
+     */
+    function _bad_algorithm_candidate($algorithm)
+    {
+        switch ($algorithm) {
+            case 'arcfour256':
+            case 'aes192-ctr':
+            case 'aes256-ctr':
+                return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * Login
+     *
+     * The $password parameter can be a plaintext password, a Crypt_RSA object or an array
+     *
+     * @param string $username
+     * @param mixed $password
+     * @param mixed $...
+     * @return bool
+     * @see self::_login()
+     * @access public
+     */
+    function login($username)
+    {
+        $args = func_get_args();
+        $this->auth[] = $args;
+        return call_user_func_array(array(&$this, '_login'), $args);
+    }
+
+    /**
+     * Login Helper
+     *
+     * @param string $username
+     * @param mixed $password
+     * @param mixed $...
+     * @return bool
+     * @see self::_login_helper()
+     * @access private
+     */
+    function _login($username)
+    {
+        if (!($this->bitmap & NET_SSH2_MASK_CONSTRUCTOR)) {
+            if (!$this->_connect()) {
+                return false;
+            }
+        }
+
+        $args = array_slice(func_get_args(), 1);
+        if (empty($args)) {
+            return $this->_login_helper($username);
+        }
+
+        foreach ($args as $arg) {
+            if ($this->_login_helper($username, $arg)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Login Helper
+     *
+     * @param string $username
+     * @param string $password
+     * @return bool
+     * @access private
+     * @internal It might be worthwhile, at some point, to protect against {@link http://tools.ietf.org/html/rfc4251#section-9.3.9 traffic analysis}
+     *           by sending dummy SSH_MSG_IGNORE messages.
+     */
+    function _login_helper($username, $password = null)
+    {
+        if (!($this->bitmap & NET_SSH2_MASK_CONNECTED)) {
+            return false;
+        }
+
+        if (!($this->bitmap & NET_SSH2_MASK_LOGIN_REQ)) {
+            $packet = pack(
+                'CNa*',
+                NET_SSH2_MSG_SERVICE_REQUEST,
+                strlen('ssh-userauth'),
+                'ssh-userauth'
+            );
+
+            if (!$this->_send_binary_packet($packet)) {
+                return false;
+            }
+
+            $response = $this->_get_binary_packet();
+            if ($response === false) {
+                if ($this->retry_connect) {
+                    $this->retry_connect = false;
+                    if (!$this->_connect()) {
+                        return false;
+                    }
+                    return $this->_login_helper($username, $password);
+                }
+                $this->bitmap = 0;
+                user_error('Connection closed by server');
+                return false;
+            }
+
+            if (strlen($response) < 4) {
+                return false;
+            }
+            extract(unpack('Ctype', $this->_string_shift($response, 1)));
+
+            if ($type != NET_SSH2_MSG_SERVICE_ACCEPT) {
+                user_error('Expected SSH_MSG_SERVICE_ACCEPT');
+                return false;
+            }
+            $this->bitmap |= NET_SSH2_MASK_LOGIN_REQ;
+        }
+
+        if (strlen($this->last_interactive_response)) {
+            return !is_string($password) && !is_array($password) ? false : $this->_keyboard_interactive_process($password);
+        }
+
+        // although PHP5's get_class() preserves the case, PHP4's does not
+        if (is_object($password)) {
+            switch (strtolower(get_class($password))) {
+                case 'crypt_rsa':
+                    return $this->_privatekey_login($username, $password);
+                case 'system_ssh_agent':
+                    return $this->_ssh_agent_login($username, $password);
+            }
+        }
+
+        if (is_array($password)) {
+            if ($this->_keyboard_interactive_login($username, $password)) {
+                $this->bitmap |= NET_SSH2_MASK_LOGIN;
+                return true;
+            }
+            return false;
+        }
+
+        if (!isset($password)) {
+            $packet = pack(
+                'CNa*Na*Na*',
+                NET_SSH2_MSG_USERAUTH_REQUEST,
+                strlen($username),
+                $username,
+                strlen('ssh-connection'),
+                'ssh-connection',
+                strlen('none'),
+                'none'
+            );
+
+            if (!$this->_send_binary_packet($packet)) {
+                return false;
+            }
+
+            $response = $this->_get_binary_packet();
+            if ($response === false) {
+                $this->bitmap = 0;
+                user_error('Connection closed by server');
+                return false;
+            }
+
+            if (!strlen($response)) {
+                return false;
+            }
+            extract(unpack('Ctype', $this->_string_shift($response, 1)));
+
+            switch ($type) {
+                case NET_SSH2_MSG_USERAUTH_SUCCESS:
+                    $this->bitmap |= NET_SSH2_MASK_LOGIN;
+                    return true;
+                //case NET_SSH2_MSG_USERAUTH_FAILURE:
+                default:
+                    return false;
+            }
+        }
+
+        $packet = pack(
+            'CNa*Na*Na*CNa*',
+            NET_SSH2_MSG_USERAUTH_REQUEST,
+            strlen($username),
+            $username,
+            strlen('ssh-connection'),
+            'ssh-connection',
+            strlen('password'),
+            'password',
+            0,
+            strlen($password),
+            $password
+        );
+
+        // remove the username and password from the logged packet
+        if (!defined('NET_SSH2_LOGGING')) {
+            $logged = null;
+        } else {
+            $logged = pack(
+                'CNa*Na*Na*CNa*',
+                NET_SSH2_MSG_USERAUTH_REQUEST,
+                strlen('username'),
+                'username',
+                strlen('ssh-connection'),
+                'ssh-connection',
+                strlen('password'),
+                'password',
+                0,
+                strlen('password'),
+                'password'
+            );
+        }
+
+        if (!$this->_send_binary_packet($packet, $logged)) {
+            return false;
+        }
+
+        $response = $this->_get_binary_packet();
+        if ($response === false) {
+            $this->bitmap = 0;
+            user_error('Connection closed by server');
+            return false;
+        }
+
+        if (!strlen($response)) {
+            return false;
+        }
+        extract(unpack('Ctype', $this->_string_shift($response, 1)));
+
+        switch ($type) {
+            case NET_SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ: // in theory, the password can be changed
+                if (defined('NET_SSH2_LOGGING')) {
+                    $this->message_number_log[count($this->message_number_log) - 1] = 'NET_SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ';
+                }
+                if (strlen($response) < 4) {
+                    return false;
+                }
+                extract(unpack('Nlength', $this->_string_shift($response, 4)));
+                $this->errors[] = 'SSH_MSG_USERAUTH_PASSWD_CHANGEREQ: ' . $this->_string_shift($response, $length);
+                return $this->_disconnect(NET_SSH2_DISCONNECT_AUTH_CANCELLED_BY_USER);
+            case NET_SSH2_MSG_USERAUTH_FAILURE:
+                // can we use keyboard-interactive authentication?  if not then either the login is bad or the server employees
+                // multi-factor authentication
+                if (strlen($response) < 4) {
+                    return false;
+                }
+                extract(unpack('Nlength', $this->_string_shift($response, 4)));
+                $auth_methods = explode(',', $this->_string_shift($response, $length));
+                if (!strlen($response)) {
+                    return false;
+                }
+                extract(unpack('Cpartial_success', $this->_string_shift($response, 1)));
+                $partial_success = $partial_success != 0;
+
+                if (!$partial_success && in_array('keyboard-interactive', $auth_methods)) {
+                    if ($this->_keyboard_interactive_login($username, $password)) {
+                        $this->bitmap |= NET_SSH2_MASK_LOGIN;
+                        return true;
+                    }
+                    return false;
+                }
+                return false;
+            case NET_SSH2_MSG_USERAUTH_SUCCESS:
+                $this->bitmap |= NET_SSH2_MASK_LOGIN;
+                return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * Login via keyboard-interactive authentication
+     *
+     * See {@link http://tools.ietf.org/html/rfc4256 RFC4256} for details.  This is not a full-featured keyboard-interactive authenticator.
+     *
+     * @param string $username
+     * @param string $password
+     * @return bool
+     * @access private
+     */
+    function _keyboard_interactive_login($username, $password)
+    {
+        $packet = pack(
+            'CNa*Na*Na*Na*Na*',
+            NET_SSH2_MSG_USERAUTH_REQUEST,
+            strlen($username),
+            $username,
+            strlen('ssh-connection'),
+            'ssh-connection',
+            strlen('keyboard-interactive'),
+            'keyboard-interactive',
+            0,
+            '',
+            0,
+            ''
+        );
+
+        if (!$this->_send_binary_packet($packet)) {
+            return false;
+        }
+
+        return $this->_keyboard_interactive_process($password);
+    }
+
+    /**
+     * Handle the keyboard-interactive requests / responses.
+     *
+     * @param string $responses...
+     * @return bool
+     * @access private
+     */
+    function _keyboard_interactive_process()
+    {
+        $responses = func_get_args();
+
+        if (strlen($this->last_interactive_response)) {
+            $response = $this->last_interactive_response;
+        } else {
+            $orig = $response = $this->_get_binary_packet();
+            if ($response === false) {
+                $this->bitmap = 0;
+                user_error('Connection closed by server');
+                return false;
+            }
+        }
+
+        if (!strlen($response)) {
+            return false;
+        }
+        extract(unpack('Ctype', $this->_string_shift($response, 1)));
+
+        switch ($type) {
+            case NET_SSH2_MSG_USERAUTH_INFO_REQUEST:
+                if (strlen($response) < 4) {
+                    return false;
+                }
+                extract(unpack('Nlength', $this->_string_shift($response, 4)));
+                $this->_string_shift($response, $length); // name; may be empty
+                if (strlen($response) < 4) {
+                    return false;
+                }
+                extract(unpack('Nlength', $this->_string_shift($response, 4)));
+                $this->_string_shift($response, $length); // instruction; may be empty
+                if (strlen($response) < 4) {
+                    return false;
+                }
+                extract(unpack('Nlength', $this->_string_shift($response, 4)));
+                $this->_string_shift($response, $length); // language tag; may be empty
+                if (strlen($response) < 4) {
+                    return false;
+                }
+                extract(unpack('Nnum_prompts', $this->_string_shift($response, 4)));
+
+                for ($i = 0; $i < count($responses); $i++) {
+                    if (is_array($responses[$i])) {
+                        foreach ($responses[$i] as $key => $value) {
+                            $this->keyboard_requests_responses[$key] = $value;
+                        }
+                        unset($responses[$i]);
+                    }
+                }
+                $responses = array_values($responses);
+
+                if (isset($this->keyboard_requests_responses)) {
+                    for ($i = 0; $i < $num_prompts; $i++) {
+                        if (strlen($response) < 4) {
+                            return false;
+                        }
+                        extract(unpack('Nlength', $this->_string_shift($response, 4)));
+                        // prompt - ie. "Password: "; must not be empty
+                        $prompt = $this->_string_shift($response, $length);
+                        //$echo = $this->_string_shift($response) != chr(0);
+                        foreach ($this->keyboard_requests_responses as $key => $value) {
+                            if (substr($prompt, 0, strlen($key)) == $key) {
+                                $responses[] = $value;
+                                break;
+                            }
+                        }
+                    }
+                }
+
+                // see http://tools.ietf.org/html/rfc4256#section-3.2
+                if (strlen($this->last_interactive_response)) {
+                    $this->last_interactive_response = '';
+                } elseif (defined('NET_SSH2_LOGGING')) {
+                    $this->message_number_log[count($this->message_number_log) - 1] = str_replace(
+                        'UNKNOWN',
+                        'NET_SSH2_MSG_USERAUTH_INFO_REQUEST',
+                        $this->message_number_log[count($this->message_number_log) - 1]
+                    );
+                }
+
+                if (!count($responses) && $num_prompts) {
+                    $this->last_interactive_response = $orig;
+                    return false;
+                }
+
+                /*
+                   After obtaining the requested information from the user, the client
+                   MUST respond with an SSH_MSG_USERAUTH_INFO_RESPONSE message.
+                */
+                // see http://tools.ietf.org/html/rfc4256#section-3.4
+                $packet = $logged = pack('CN', NET_SSH2_MSG_USERAUTH_INFO_RESPONSE, count($responses));
+                for ($i = 0; $i < count($responses); $i++) {
+                    $packet.= pack('Na*', strlen($responses[$i]), $responses[$i]);
+                    $logged.= pack('Na*', strlen('dummy-answer'), 'dummy-answer');
+                }
+
+                if (!$this->_send_binary_packet($packet, $logged)) {
+                    return false;
+                }
+
+                if (defined('NET_SSH2_LOGGING') && NET_SSH2_LOGGING == NET_SSH2_LOG_COMPLEX) {
+                    $this->message_number_log[count($this->message_number_log) - 1] = str_replace(
+                        'UNKNOWN',
+                        'NET_SSH2_MSG_USERAUTH_INFO_RESPONSE',
+                        $this->message_number_log[count($this->message_number_log) - 1]
+                    );
+                }
+
+                /*
+                   After receiving the response, the server MUST send either an
+                   SSH_MSG_USERAUTH_SUCCESS, SSH_MSG_USERAUTH_FAILURE, or another
+                   SSH_MSG_USERAUTH_INFO_REQUEST message.
+                */
+                // maybe phpseclib should force close the connection after x request / responses?  unless something like that is done
+                // there could be an infinite loop of request / responses.
+                return $this->_keyboard_interactive_process();
+            case NET_SSH2_MSG_USERAUTH_SUCCESS:
+                return true;
+            case NET_SSH2_MSG_USERAUTH_FAILURE:
+                return false;
+        }
+
+        return false;
+    }
+
+    /**
+     * Login with an ssh-agent provided key
+     *
+     * @param string $username
+     * @param System_SSH_Agent $agent
+     * @return bool
+     * @access private
+     */
+    function _ssh_agent_login($username, $agent)
+    {
+        $this->agent = $agent;
+        $keys = $agent->requestIdentities();
+        foreach ($keys as $key) {
+            if ($this->_privatekey_login($username, $key)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Login with an RSA private key
+     *
+     * @param string $username
+     * @param Crypt_RSA $password
+     * @return bool
+     * @access private
+     * @internal It might be worthwhile, at some point, to protect against {@link http://tools.ietf.org/html/rfc4251#section-9.3.9 traffic analysis}
+     *           by sending dummy SSH_MSG_IGNORE messages.
+     */
+    function _privatekey_login($username, $privatekey)
+    {
+        // see http://tools.ietf.org/html/rfc4253#page-15
+        $publickey = $privatekey->getPublicKey(CRYPT_RSA_PUBLIC_FORMAT_RAW);
+        if ($publickey === false) {
+            return false;
+        }
+
+        $publickey = array(
+            'e' => $publickey['e']->toBytes(true),
+            'n' => $publickey['n']->toBytes(true)
+        );
+        $publickey = pack(
+            'Na*Na*Na*',
+            strlen('ssh-rsa'),
+            'ssh-rsa',
+            strlen($publickey['e']),
+            $publickey['e'],
+            strlen($publickey['n']),
+            $publickey['n']
+        );
+
+        $part1 = pack(
+            'CNa*Na*Na*',
+            NET_SSH2_MSG_USERAUTH_REQUEST,
+            strlen($username),
+            $username,
+            strlen('ssh-connection'),
+            'ssh-connection',
+            strlen('publickey'),
+            'publickey'
+        );
+        $part2 = pack('Na*Na*', strlen('ssh-rsa'), 'ssh-rsa', strlen($publickey), $publickey);
+
+        $packet = $part1 . chr(0) . $part2;
+        if (!$this->_send_binary_packet($packet)) {
+            return false;
+        }
+
+        $response = $this->_get_binary_packet();
+        if ($response === false) {
+            $this->bitmap = 0;
+            user_error('Connection closed by server');
+            return false;
+        }
+
+        if (!strlen($response)) {
+            return false;
+        }
+        extract(unpack('Ctype', $this->_string_shift($response, 1)));
+
+        switch ($type) {
+            case NET_SSH2_MSG_USERAUTH_FAILURE:
+                if (strlen($response) < 4) {
+                    return false;
+                }
+                extract(unpack('Nlength', $this->_string_shift($response, 4)));
+                $this->errors[] = 'SSH_MSG_USERAUTH_FAILURE: ' . $this->_string_shift($response, $length);
+                return false;
+            case NET_SSH2_MSG_USERAUTH_PK_OK:
+                // we'll just take it on faith that the public key blob and the public key algorithm name are as
+                // they should be
+                if (defined('NET_SSH2_LOGGING') && NET_SSH2_LOGGING == NET_SSH2_LOG_COMPLEX) {
+                    $this->message_number_log[count($this->message_number_log) - 1] = str_replace(
+                        'UNKNOWN',
+                        'NET_SSH2_MSG_USERAUTH_PK_OK',
+                        $this->message_number_log[count($this->message_number_log) - 1]
+                    );
+                }
+        }
+
+        $packet = $part1 . chr(1) . $part2;
+        $privatekey->setSignatureMode(CRYPT_RSA_SIGNATURE_PKCS1);
+        switch ($this->signature_format) {
+            case 'rsa-sha2-512':
+                $hash = 'sha512';
+                $type = 'rsa-sha2-512';
+                break;
+            case 'rsa-sha2-256':
+                $hash = 'sha256';
+                $type = 'rsa-sha2-256';
+                break;
+            //case 'ssh-rsa':
+            default:
+                $hash = 'sha1';
+                $type = 'ssh-rsa';
+        }
+        $privatekey->setHash($hash);
+        $signature = $privatekey->sign(pack('Na*a*', strlen($this->session_id), $this->session_id, $packet));
+        $signature = pack('Na*Na*', strlen($type), $type, strlen($signature), $signature);
+        $packet.= pack('Na*', strlen($signature), $signature);
+
+        if (!$this->_send_binary_packet($packet)) {
+            return false;
+        }
+
+        $response = $this->_get_binary_packet();
+        if ($response === false) {
+            $this->bitmap = 0;
+            user_error('Connection closed by server');
+            return false;
+        }
+
+        if (!strlen($response)) {
+            return false;
+        }
+        extract(unpack('Ctype', $this->_string_shift($response, 1)));
+
+        switch ($type) {
+            case NET_SSH2_MSG_USERAUTH_FAILURE:
+                // either the login is bad or the server employs multi-factor authentication
+                return false;
+            case NET_SSH2_MSG_USERAUTH_SUCCESS:
+                $this->bitmap |= NET_SSH2_MASK_LOGIN;
+                return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * Set Timeout
+     *
+     * $ssh->exec('ping 127.0.0.1'); on a Linux host will never return and will run indefinitely.  setTimeout() makes it so it'll timeout.
+     * Setting $timeout to false or 0 will mean there is no timeout.
+     *
+     * @param mixed $timeout
+     * @access public
+     */
+    function setTimeout($timeout)
+    {
+        $this->timeout = $this->curTimeout = $timeout;
+    }
+
+    /**
+     * Get the output from stdError
+     *
+     * @access public
+     */
+    function getStdError()
+    {
+        return $this->stdErrorLog;
+    }
+
+    /**
+     * Execute Command
+     *
+     * If $callback is set to false then Net_SSH2::_get_channel_packet(NET_SSH2_CHANNEL_EXEC) will need to be called manually.
+     * In all likelihood, this is not a feature you want to be taking advantage of.
+     *
+     * @param string $command
+     * @param Callback $callback
+     * @return string
+     * @access public
+     */
+    function exec($command, $callback = null)
+    {
+        $this->curTimeout = $this->timeout;
+        $this->is_timeout = false;
+        $this->stdErrorLog = '';
+
+        if (!$this->isAuthenticated()) {
+            return false;
+        }
+
+        if ($this->in_request_pty_exec) {
+            user_error('If you want to run multiple exec()\'s you will need to disable (and re-enable if appropriate) a PTY for each one.');
+            return false;
+        }
+
+        // RFC4254 defines the (client) window size as "bytes the other party can send before it must wait for the window to
+        // be adjusted".  0x7FFFFFFF is, at 2GB, the max size.  technically, it should probably be decremented, but,
+        // honestly, if you're transferring more than 2GB, you probably shouldn't be using phpseclib, anyway.
+        // see http://tools.ietf.org/html/rfc4254#section-5.2 for more info
+        $this->window_size_server_to_client[NET_SSH2_CHANNEL_EXEC] = $this->window_size;
+        // 0x8000 is the maximum max packet size, per http://tools.ietf.org/html/rfc4253#section-6.1, although since PuTTy
+        // uses 0x4000, that's what will be used here, as well.
+        $packet_size = 0x4000;
+
+        $packet = pack(
+            'CNa*N3',
+            NET_SSH2_MSG_CHANNEL_OPEN,
+            strlen('session'),
+            'session',
+            NET_SSH2_CHANNEL_EXEC,
+            $this->window_size_server_to_client[NET_SSH2_CHANNEL_EXEC],
+            $packet_size
+        );
+
+        if (!$this->_send_binary_packet($packet)) {
+            return false;
+        }
+
+        $this->channel_status[NET_SSH2_CHANNEL_EXEC] = NET_SSH2_MSG_CHANNEL_OPEN;
+
+        $response = $this->_get_channel_packet(NET_SSH2_CHANNEL_EXEC);
+        if ($response === false) {
+            return false;
+        }
+
+        if ($this->request_pty === true) {
+            $terminal_modes = pack('C', NET_SSH2_TTY_OP_END);
+            $packet = pack(
+                'CNNa*CNa*N5a*',
+                NET_SSH2_MSG_CHANNEL_REQUEST,
+                $this->server_channels[NET_SSH2_CHANNEL_EXEC],
+                strlen('pty-req'),
+                'pty-req',
+                1,
+                strlen('vt100'),
+                'vt100',
+                $this->windowColumns,
+                $this->windowRows,
+                0,
+                0,
+                strlen($terminal_modes),
+                $terminal_modes
+            );
+
+            if (!$this->_send_binary_packet($packet)) {
+                return false;
+            }
+
+            $response = $this->_get_binary_packet();
+            if ($response === false) {
+                $this->bitmap = 0;
+                user_error('Connection closed by server');
+                return false;
+            }
+
+            if (!strlen($response)) {
+                return false;
+            }
+            list(, $type) = unpack('C', $this->_string_shift($response, 1));
+
+            switch ($type) {
+                case NET_SSH2_MSG_CHANNEL_SUCCESS:
+                    break;
+                case NET_SSH2_MSG_CHANNEL_FAILURE:
+                default:
+                    user_error('Unable to request pseudo-terminal');
+                    return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION);
+            }
+            $this->in_request_pty_exec = true;
+        }
+
+        // sending a pty-req SSH_MSG_CHANNEL_REQUEST message is unnecessary and, in fact, in most cases, slows things
+        // down.  the one place where it might be desirable is if you're doing something like Net_SSH2::exec('ping localhost &').
+        // with a pty-req SSH_MSG_CHANNEL_REQUEST, exec() will return immediately and the ping process will then
+        // then immediately terminate.  without such a request exec() will loop indefinitely.  the ping process won't end but
+        // neither will your script.
+
+        // although, in theory, the size of SSH_MSG_CHANNEL_REQUEST could exceed the maximum packet size established by
+        // SSH_MSG_CHANNEL_OPEN_CONFIRMATION, RFC4254#section-5.1 states that the "maximum packet size" refers to the
+        // "maximum size of an individual data packet". ie. SSH_MSG_CHANNEL_DATA.  RFC4254#section-5.2 corroborates.
+        $packet = pack(
+            'CNNa*CNa*',
+            NET_SSH2_MSG_CHANNEL_REQUEST,
+            $this->server_channels[NET_SSH2_CHANNEL_EXEC],
+            strlen('exec'),
+            'exec',
+            1,
+            strlen($command),
+            $command
+        );
+
+        if (!$this->_send_binary_packet($packet)) {
+            return false;
+        }
+
+        $this->channel_status[NET_SSH2_CHANNEL_EXEC] = NET_SSH2_MSG_CHANNEL_REQUEST;
+
+        $response = $this->_get_channel_packet(NET_SSH2_CHANNEL_EXEC);
+        if ($response === false) {
+            return false;
+        }
+
+        $this->channel_status[NET_SSH2_CHANNEL_EXEC] = NET_SSH2_MSG_CHANNEL_DATA;
+
+        if ($callback === false || $this->in_request_pty_exec) {
+            return true;
+        }
+
+        $output = '';
+        while (true) {
+            $temp = $this->_get_channel_packet(NET_SSH2_CHANNEL_EXEC);
+            switch (true) {
+                case $temp === true:
+                    return is_callable($callback) ? true : $output;
+                case $temp === false:
+                    return false;
+                default:
+                    if (is_callable($callback)) {
+                        if (call_user_func($callback, $temp) === true) {
+                            $this->_close_channel(NET_SSH2_CHANNEL_EXEC);
+                            return true;
+                        }
+                    } else {
+                        $output.= $temp;
+                    }
+            }
+        }
+    }
+
+    /**
+     * Creates an interactive shell
+     *
+     * @see self::read()
+     * @see self::write()
+     * @return bool
+     * @access private
+     */
+    function _initShell()
+    {
+        if ($this->in_request_pty_exec === true) {
+            return true;
+        }
+
+        $this->window_size_server_to_client[NET_SSH2_CHANNEL_SHELL] = $this->window_size;
+        $packet_size = 0x4000;
+
+        $packet = pack(
+            'CNa*N3',
+            NET_SSH2_MSG_CHANNEL_OPEN,
+            strlen('session'),
+            'session',
+            NET_SSH2_CHANNEL_SHELL,
+            $this->window_size_server_to_client[NET_SSH2_CHANNEL_SHELL],
+            $packet_size
+        );
+
+        if (!$this->_send_binary_packet($packet)) {
+            return false;
+        }
+
+        $this->channel_status[NET_SSH2_CHANNEL_SHELL] = NET_SSH2_MSG_CHANNEL_OPEN;
+
+        $response = $this->_get_channel_packet(NET_SSH2_CHANNEL_SHELL);
+        if ($response === false) {
+            return false;
+        }
+
+        $terminal_modes = pack('C', NET_SSH2_TTY_OP_END);
+        $packet = pack(
+            'CNNa*CNa*N5a*',
+            NET_SSH2_MSG_CHANNEL_REQUEST,
+            $this->server_channels[NET_SSH2_CHANNEL_SHELL],
+            strlen('pty-req'),
+            'pty-req',
+            1,
+            strlen('vt100'),
+            'vt100',
+            $this->windowColumns,
+            $this->windowRows,
+            0,
+            0,
+            strlen($terminal_modes),
+            $terminal_modes
+        );
+
+        if (!$this->_send_binary_packet($packet)) {
+            return false;
+        }
+
+        $response = $this->_get_binary_packet();
+        if ($response === false) {
+            $this->bitmap = 0;
+            user_error('Connection closed by server');
+            return false;
+        }
+
+        if (!strlen($response)) {
+            return false;
+        }
+        list(, $type) = unpack('C', $this->_string_shift($response, 1));
+
+        switch ($type) {
+            case NET_SSH2_MSG_CHANNEL_SUCCESS:
+            // if a pty can't be opened maybe commands can still be executed
+            case NET_SSH2_MSG_CHANNEL_FAILURE:
+                break;
+            default:
+                user_error('Unable to request pseudo-terminal');
+                return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION);
+        }
+
+        $packet = pack(
+            'CNNa*C',
+            NET_SSH2_MSG_CHANNEL_REQUEST,
+            $this->server_channels[NET_SSH2_CHANNEL_SHELL],
+            strlen('shell'),
+            'shell',
+            1
+        );
+        if (!$this->_send_binary_packet($packet)) {
+            return false;
+        }
+
+        $this->channel_status[NET_SSH2_CHANNEL_SHELL] = NET_SSH2_MSG_CHANNEL_REQUEST;
+
+        $response = $this->_get_channel_packet(NET_SSH2_CHANNEL_SHELL);
+        if ($response === false) {
+            return false;
+        }
+
+        $this->channel_status[NET_SSH2_CHANNEL_SHELL] = NET_SSH2_MSG_CHANNEL_DATA;
+
+        $this->bitmap |= NET_SSH2_MASK_SHELL;
+
+        return true;
+    }
+
+    /**
+     * Return the channel to be used with read() / write()
+     *
+     * @see self::read()
+     * @see self::write()
+     * @return int
+     * @access public
+     */
+    function _get_interactive_channel()
+    {
+        switch (true) {
+            case $this->in_subsystem:
+                return NET_SSH2_CHANNEL_SUBSYSTEM;
+            case $this->in_request_pty_exec:
+                return NET_SSH2_CHANNEL_EXEC;
+            default:
+                return NET_SSH2_CHANNEL_SHELL;
+        }
+    }
+
+    /**
+     * Return an available open channel
+     *
+     * @return int
+     * @access public
+     */
+    function _get_open_channel()
+    {
+        $channel = NET_SSH2_CHANNEL_EXEC;
+        do {
+            if (isset($this->channel_status[$channel]) && $this->channel_status[$channel] == NET_SSH2_MSG_CHANNEL_OPEN) {
+                return $channel;
+            }
+        } while ($channel++ < NET_SSH2_CHANNEL_SUBSYSTEM);
+
+        return false;
+    }
+
+    /**
+     * Returns the output of an interactive shell
+     *
+     * Returns when there's a match for $expect, which can take the form of a string literal or,
+     * if $mode == NET_SSH2_READ_REGEX, a regular expression.
+     *
+     * @see self::write()
+     * @param string $expect
+     * @param int $mode
+     * @return string
+     * @access public
+     */
+    function read($expect = '', $mode = NET_SSH2_READ_SIMPLE)
+    {
+        $this->curTimeout = $this->timeout;
+        $this->is_timeout = false;
+
+        if (!$this->isAuthenticated()) {
+            user_error('Operation disallowed prior to login()');
+            return false;
+        }
+
+        if (!($this->bitmap & NET_SSH2_MASK_SHELL) && !$this->_initShell()) {
+            user_error('Unable to initiate an interactive shell session');
+            return false;
+        }
+
+        $channel = $this->_get_interactive_channel();
+
+        if ($mode == NET_SSH2_READ_NEXT) {
+            return $this->_get_channel_packet($channel);
+        }
+
+        $match = $expect;
+        while (true) {
+            if ($mode == NET_SSH2_READ_REGEX) {
+                preg_match($expect, substr($this->interactiveBuffer, -1024), $matches);
+                $match = isset($matches[0]) ? $matches[0] : '';
+            }
+            $pos = strlen($match) ? strpos($this->interactiveBuffer, $match) : false;
+            if ($pos !== false) {
+                return $this->_string_shift($this->interactiveBuffer, $pos + strlen($match));
+            }
+            $response = $this->_get_channel_packet($channel);
+            if (is_bool($response)) {
+                $this->in_request_pty_exec = false;
+                return $response ? $this->_string_shift($this->interactiveBuffer, strlen($this->interactiveBuffer)) : false;
+            }
+
+            $this->interactiveBuffer.= $response;
+        }
+    }
+
+    /**
+     * Inputs a command into an interactive shell.
+     *
+     * @see self::read()
+     * @param string $cmd
+     * @return bool
+     * @access public
+     */
+    function write($cmd)
+    {
+        if (!$this->isAuthenticated()) {
+            user_error('Operation disallowed prior to login()');
+            return false;
+        }
+
+        if (!($this->bitmap & NET_SSH2_MASK_SHELL) && !$this->_initShell()) {
+            user_error('Unable to initiate an interactive shell session');
+            return false;
+        }
+
+        return $this->_send_channel_packet($this->_get_interactive_channel(), $cmd);
+    }
+
+    /**
+     * Start a subsystem.
+     *
+     * Right now only one subsystem at a time is supported. To support multiple subsystem's stopSubsystem() could accept
+     * a string that contained the name of the subsystem, but at that point, only one subsystem of each type could be opened.
+     * To support multiple subsystem's of the same name maybe it'd be best if startSubsystem() generated a new channel id and
+     * returns that and then that that was passed into stopSubsystem() but that'll be saved for a future date and implemented
+     * if there's sufficient demand for such a feature.
+     *
+     * @see self::stopSubsystem()
+     * @param string $subsystem
+     * @return bool
+     * @access public
+     */
+    function startSubsystem($subsystem)
+    {
+        $this->window_size_server_to_client[NET_SSH2_CHANNEL_SUBSYSTEM] = $this->window_size;
+
+        $packet = pack(
+            'CNa*N3',
+            NET_SSH2_MSG_CHANNEL_OPEN,
+            strlen('session'),
+            'session',
+            NET_SSH2_CHANNEL_SUBSYSTEM,
+            $this->window_size,
+            0x4000
+        );
+
+        if (!$this->_send_binary_packet($packet)) {
+            return false;
+        }
+
+        $this->channel_status[NET_SSH2_CHANNEL_SUBSYSTEM] = NET_SSH2_MSG_CHANNEL_OPEN;
+
+        $response = $this->_get_channel_packet(NET_SSH2_CHANNEL_SUBSYSTEM);
+        if ($response === false) {
+            return false;
+        }
+
+        $packet = pack(
+            'CNNa*CNa*',
+            NET_SSH2_MSG_CHANNEL_REQUEST,
+            $this->server_channels[NET_SSH2_CHANNEL_SUBSYSTEM],
+            strlen('subsystem'),
+            'subsystem',
+            1,
+            strlen($subsystem),
+            $subsystem
+        );
+        if (!$this->_send_binary_packet($packet)) {
+            return false;
+        }
+
+        $this->channel_status[NET_SSH2_CHANNEL_SUBSYSTEM] = NET_SSH2_MSG_CHANNEL_REQUEST;
+
+        $response = $this->_get_channel_packet(NET_SSH2_CHANNEL_SUBSYSTEM);
+
+        if ($response === false) {
+            return false;
+        }
+
+        $this->channel_status[NET_SSH2_CHANNEL_SUBSYSTEM] = NET_SSH2_MSG_CHANNEL_DATA;
+
+        $this->bitmap |= NET_SSH2_MASK_SHELL;
+        $this->in_subsystem = true;
+
+        return true;
+    }
+
+    /**
+     * Stops a subsystem.
+     *
+     * @see self::startSubsystem()
+     * @return bool
+     * @access public
+     */
+    function stopSubsystem()
+    {
+        $this->in_subsystem = false;
+        $this->_close_channel(NET_SSH2_CHANNEL_SUBSYSTEM);
+        return true;
+    }
+
+    /**
+     * Closes a channel
+     *
+     * If read() timed out you might want to just close the channel and have it auto-restart on the next read() call
+     *
+     * @access public
+     */
+    function reset()
+    {
+        $this->_close_channel($this->_get_interactive_channel());
+    }
+
+    /**
+     * Is timeout?
+     *
+     * Did exec() or read() return because they timed out or because they encountered the end?
+     *
+     * @access public
+     */
+    function isTimeout()
+    {
+        return $this->is_timeout;
+    }
+
+    /**
+     * Disconnect
+     *
+     * @access public
+     */
+    function disconnect()
+    {
+        $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION);
+        if (isset($this->realtime_log_file) && is_resource($this->realtime_log_file)) {
+            fclose($this->realtime_log_file);
+        }
+    }
+
+    /**
+     * Destructor.
+     *
+     * Will be called, automatically, if you're supporting just PHP5.  If you're supporting PHP4, you'll need to call
+     * disconnect().
+     *
+     * @access public
+     */
+    function __destruct()
+    {
+        $this->disconnect();
+    }
+
+    /**
+     * Is the connection still active?
+     *
+     * @return bool
+     * @access public
+     */
+    function isConnected()
+    {
+        return (bool) ($this->bitmap & NET_SSH2_MASK_CONNECTED);
+    }
+
+    /**
+     * Have you successfully been logged in?
+     *
+     * @return bool
+     * @access public
+     */
+    function isAuthenticated()
+    {
+        return (bool) ($this->bitmap & NET_SSH2_MASK_LOGIN);
+    }
+
+    /**
+     * Pings a server connection, or tries to reconnect if the connection has gone down
+     *
+     * Inspired by http://php.net/manual/en/mysqli.ping.php
+     *
+     * @return bool
+     * @access public
+     */
+    function ping()
+    {
+        if (!$this->isAuthenticated()) {
+            return false;
+        }
+
+        $this->window_size_server_to_client[NET_SSH2_CHANNEL_KEEP_ALIVE] = $this->window_size;
+        $packet_size = 0x4000;
+        $packet = pack(
+            'CNa*N3',
+            NET_SSH2_MSG_CHANNEL_OPEN,
+            strlen('session'),
+            'session',
+            NET_SSH2_CHANNEL_KEEP_ALIVE,
+            $this->window_size_server_to_client[NET_SSH2_CHANNEL_KEEP_ALIVE],
+            $packet_size
+        );
+
+        if (!@$this->_send_binary_packet($packet)) {
+            return $this->_reconnect();
+        }
+
+        $this->channel_status[NET_SSH2_CHANNEL_KEEP_ALIVE] = NET_SSH2_MSG_CHANNEL_OPEN;
+
+        $response = @$this->_get_channel_packet(NET_SSH2_CHANNEL_KEEP_ALIVE);
+        if ($response !== false) {
+            $this->_close_channel(NET_SSH2_CHANNEL_KEEP_ALIVE);
+            return true;
+        }
+
+        return $this->_reconnect();
+    }
+
+    /**
+     * In situ reconnect method
+     *
+     * @return boolean
+     * @access private
+     */
+    function _reconnect()
+    {
+        $this->_reset_connection(NET_SSH2_DISCONNECT_CONNECTION_LOST);
+        $this->retry_connect = true;
+        if (!$this->_connect()) {
+            return false;
+        }
+        foreach ($this->auth as $auth) {
+            $result = call_user_func_array(array(&$this, 'parent::login'), $auth);
+        }
+        return $result;
+    }
+
+    /**
+     * Resets a connection for re-use
+     *
+     * @param int $reason
+     * @access private
+     */
+    function _reset_connection($reason)
+    {
+        $this->_disconnect($reason);
+        $this->decrypt = $this->encrypt = false;
+        $this->decrypt_block_size = $this->encrypt_block_size = 8;
+        $this->hmac_check = $this->hmac_create = false;
+        $this->hmac_size = false;
+        $this->session_id = false;
+        $this->retry_connect = true;
+        $this->get_seq_no = $this->send_seq_no = 0;
+    }
+
+    /**
+     * Gets Binary Packets
+     *
+     * See '6. Binary Packet Protocol' of rfc4253 for more info.
+     *
+     * @see self::_send_binary_packet()
+     * @return string
+     * @access private
+     */
+    function _get_binary_packet($skip_channel_filter = false)
+    {
+        if (!is_resource($this->fsock) || feof($this->fsock)) {
+            $this->bitmap = 0;
+            user_error('Connection closed prematurely');
+            return false;
+        }
+
+        $start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838
+        $raw = fread($this->fsock, $this->decrypt_block_size);
+
+        if (!strlen($raw)) {
+            return '';
+        }
+
+        if ($this->decrypt !== false) {
+            $raw = $this->decrypt->decrypt($raw);
+        }
+        if ($raw === false) {
+            user_error('Unable to decrypt content');
+            return false;
+        }
+
+        if (strlen($raw) < 5) {
+            return false;
+        }
+        extract(unpack('Npacket_length/Cpadding_length', $this->_string_shift($raw, 5)));
+
+        $remaining_length = $packet_length + 4 - $this->decrypt_block_size;
+
+        // quoting <http://tools.ietf.org/html/rfc4253#section-6.1>,
+        // "implementations SHOULD check that the packet length is reasonable"
+        // PuTTY uses 0x9000 as the actual max packet size and so to shall we
+        if ($remaining_length < -$this->decrypt_block_size || $remaining_length > 0x9000 || $remaining_length % $this->decrypt_block_size != 0) {
+            if (!$this->bad_key_size_fix && $this->_bad_algorithm_candidate($this->decrypt_algorithm) && !($this->bitmap & NET_SSH2_MASK_LOGIN)) {
+                $this->bad_key_size_fix = true;
+                $this->_reset_connection(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
+                return false;
+            }
+            user_error('Invalid size');
+            return false;
+        }
+
+        $buffer = '';
+        while ($remaining_length > 0) {
+            $temp = fread($this->fsock, $remaining_length);
+            if ($temp === false || feof($this->fsock)) {
+                $this->bitmap = 0;
+                user_error('Error reading from socket');
+                return false;
+            }
+            $buffer.= $temp;
+            $remaining_length-= strlen($temp);
+        }
+
+        $stop = strtok(microtime(), ' ') + strtok('');
+        if (strlen($buffer)) {
+            $raw.= $this->decrypt !== false ? $this->decrypt->decrypt($buffer) : $buffer;
+        }
+
+        $payload = $this->_string_shift($raw, $packet_length - $padding_length - 1);
+        $padding = $this->_string_shift($raw, $padding_length); // should leave $raw empty
+
+        if ($this->hmac_check !== false) {
+            $hmac = fread($this->fsock, $this->hmac_size);
+            if ($hmac === false || strlen($hmac) != $this->hmac_size) {
+                $this->bitmap = 0;
+                user_error('Error reading socket');
+                return false;
+            } elseif ($hmac != $this->hmac_check->hash(pack('NNCa*', $this->get_seq_no, $packet_length, $padding_length, $payload . $padding))) {
+                user_error('Invalid HMAC');
+                return false;
+            }
+        }
+
+        //if ($this->decompress) {
+        //    $payload = gzinflate(substr($payload, 2));
+        //}
+
+        $this->get_seq_no++;
+
+        if (defined('NET_SSH2_LOGGING')) {
+            $current = strtok(microtime(), ' ') + strtok('');
+            $message_number = isset($this->message_numbers[ord($payload[0])]) ? $this->message_numbers[ord($payload[0])] : 'UNKNOWN (' . ord($payload[0]) . ')';
+            $message_number = '<- ' . $message_number .
+                              ' (since last: ' . round($current - $this->last_packet, 4) . ', network: ' . round($stop - $start, 4) . 's)';
+            $this->_append_log($message_number, $payload);
+            $this->last_packet = $current;
+        }
+
+        return $this->_filter($payload, $skip_channel_filter);
+    }
+
+    /**
+     * Filter Binary Packets
+     *
+     * Because some binary packets need to be ignored...
+     *
+     * @see self::_get_binary_packet()
+     * @return string
+     * @access private
+     */
+    function _filter($payload, $skip_channel_filter)
+    {
+        switch (ord($payload[0])) {
+            case NET_SSH2_MSG_DISCONNECT:
+                $this->_string_shift($payload, 1);
+                if (strlen($payload) < 8) {
+                    return false;
+                }
+                extract(unpack('Nreason_code/Nlength', $this->_string_shift($payload, 8)));
+                $this->errors[] = 'SSH_MSG_DISCONNECT: ' . $this->disconnect_reasons[$reason_code] . "\r\n" . $this->_string_shift($payload, $length);
+                $this->bitmap = 0;
+                return false;
+            case NET_SSH2_MSG_IGNORE:
+                $payload = $this->_get_binary_packet($skip_channel_filter);
+                break;
+            case NET_SSH2_MSG_DEBUG:
+                $this->_string_shift($payload, 2);
+                if (strlen($payload) < 4) {
+                    return false;
+                }
+                extract(unpack('Nlength', $this->_string_shift($payload, 4)));
+                $this->errors[] = 'SSH_MSG_DEBUG: ' . $this->_string_shift($payload, $length);
+                $payload = $this->_get_binary_packet($skip_channel_filter);
+                break;
+            case NET_SSH2_MSG_UNIMPLEMENTED:
+                return false;
+            case NET_SSH2_MSG_KEXINIT:
+                if ($this->session_id !== false) {
+                    $this->send_kex_first = false;
+                    if (!$this->_key_exchange($payload)) {
+                        $this->bitmap = 0;
+                        return false;
+                    }
+                    $payload = $this->_get_binary_packet($skip_channel_filter);
+                }
+        }
+
+        // see http://tools.ietf.org/html/rfc4252#section-5.4; only called when the encryption has been activated and when we haven't already logged in
+        if (($this->bitmap & NET_SSH2_MASK_CONNECTED) && !$this->isAuthenticated() && ord($payload[0]) == NET_SSH2_MSG_USERAUTH_BANNER) {
+            $this->_string_shift($payload, 1);
+            if (strlen($payload) < 4) {
+                return false;
+            }
+            extract(unpack('Nlength', $this->_string_shift($payload, 4)));
+            $this->banner_message = $this->_string_shift($payload, $length);
+            $payload = $this->_get_binary_packet();
+        }
+
+        // only called when we've already logged in
+        if (($this->bitmap & NET_SSH2_MASK_CONNECTED) && $this->isAuthenticated()) {
+            switch (ord($payload[0])) {
+                case NET_SSH2_MSG_CHANNEL_DATA:
+                case NET_SSH2_MSG_CHANNEL_EXTENDED_DATA:
+                case NET_SSH2_MSG_CHANNEL_REQUEST:
+                case NET_SSH2_MSG_CHANNEL_CLOSE:
+                case NET_SSH2_MSG_CHANNEL_EOF:
+                    if (!$skip_channel_filter && !empty($this->server_channels)) {
+                        $this->binary_packet_buffer = $payload;
+                        $this->_get_channel_packet(true);
+                        $payload = $this->_get_binary_packet();
+                    }
+                    break;
+                case NET_SSH2_MSG_GLOBAL_REQUEST: // see http://tools.ietf.org/html/rfc4254#section-4
+                    if (strlen($payload) < 4) {
+                        return false;
+                    }
+                    extract(unpack('Nlength', $this->_string_shift($payload, 4)));
+                    $this->errors[] = 'SSH_MSG_GLOBAL_REQUEST: ' . $this->_string_shift($payload, $length);
+
+                    if (!$this->_send_binary_packet(pack('C', NET_SSH2_MSG_REQUEST_FAILURE))) {
+                        return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION);
+                    }
+
+                    $payload = $this->_get_binary_packet($skip_channel_filter);
+                    break;
+                case NET_SSH2_MSG_CHANNEL_OPEN: // see http://tools.ietf.org/html/rfc4254#section-5.1
+                    $this->_string_shift($payload, 1);
+                    if (strlen($payload) < 4) {
+                        return false;
+                    }
+                    extract(unpack('Nlength', $this->_string_shift($payload, 4)));
+                    $data = $this->_string_shift($payload, $length);
+                    if (strlen($payload) < 4) {
+                        return false;
+                    }
+                    extract(unpack('Nserver_channel', $this->_string_shift($payload, 4)));
+                    switch ($data) {
+                        case 'auth-agent':
+                        case 'auth-agent@openssh.com':
+                            if (isset($this->agent)) {
+                                $new_channel = NET_SSH2_CHANNEL_AGENT_FORWARD;
+
+                                if (strlen($payload) < 8) {
+                                    return false;
+                                }
+                                extract(unpack('Nremote_window_size', $this->_string_shift($payload, 4)));
+                                extract(unpack('Nremote_maximum_packet_size', $this->_string_shift($payload, 4)));
+
+                                $this->packet_size_client_to_server[$new_channel] = $remote_window_size;
+                                $this->window_size_server_to_client[$new_channel] = $remote_maximum_packet_size;
+                                $this->window_size_client_to_server[$new_channel] = $this->window_size;
+
+                                $packet_size = 0x4000;
+
+                                $packet = pack(
+                                    'CN4',
+                                    NET_SSH2_MSG_CHANNEL_OPEN_CONFIRMATION,
+                                    $server_channel,
+                                    $new_channel,
+                                    $packet_size,
+                                    $packet_size
+                                );
+
+                                $this->server_channels[$new_channel] = $server_channel;
+                                $this->channel_status[$new_channel] = NET_SSH2_MSG_CHANNEL_OPEN_CONFIRMATION;
+                                if (!$this->_send_binary_packet($packet)) {
+                                    return false;
+                                }
+                            }
+                            break;
+                        default:
+                            $packet = pack(
+                                'CN3a*Na*',
+                                NET_SSH2_MSG_REQUEST_FAILURE,
+                                $server_channel,
+                                NET_SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED,
+                                0,
+                                '',
+                                0,
+                                ''
+                            );
+
+                            if (!$this->_send_binary_packet($packet)) {
+                                return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION);
+                            }
+                    }
+                    $payload = $this->_get_binary_packet($skip_channel_filter);
+                    break;
+                case NET_SSH2_MSG_CHANNEL_WINDOW_ADJUST:
+                    $this->_string_shift($payload, 1);
+                    if (strlen($payload) < 8) {
+                        return false;
+                    }
+                    extract(unpack('Nchannel', $this->_string_shift($payload, 4)));
+                    extract(unpack('Nwindow_size', $this->_string_shift($payload, 4)));
+                    $this->window_size_client_to_server[$channel]+= $window_size;
+
+                    $payload = ($this->bitmap & NET_SSH2_MASK_WINDOW_ADJUST) ? true : $this->_get_binary_packet($skip_channel_filter);
+            }
+        }
+
+        return $payload;
+    }
+
+    /**
+     * Enable Quiet Mode
+     *
+     * Suppress stderr from output
+     *
+     * @access public
+     */
+    function enableQuietMode()
+    {
+        $this->quiet_mode = true;
+    }
+
+    /**
+     * Disable Quiet Mode
+     *
+     * Show stderr in output
+     *
+     * @access public
+     */
+    function disableQuietMode()
+    {
+        $this->quiet_mode = false;
+    }
+
+    /**
+     * Returns whether Quiet Mode is enabled or not
+     *
+     * @see self::enableQuietMode()
+     * @see self::disableQuietMode()
+     *
+     * @access public
+     * @return bool
+     */
+    function isQuietModeEnabled()
+    {
+        return $this->quiet_mode;
+    }
+
+    /**
+     * Enable request-pty when using exec()
+     *
+     * @access public
+     */
+    function enablePTY()
+    {
+        $this->request_pty = true;
+    }
+
+    /**
+     * Disable request-pty when using exec()
+     *
+     * @access public
+     */
+    function disablePTY()
+    {
+        if ($this->in_request_pty_exec) {
+            $this->_close_channel(NET_SSH2_CHANNEL_EXEC);
+            $this->in_request_pty_exec = false;
+        }
+        $this->request_pty = false;
+    }
+
+    /**
+     * Returns whether request-pty is enabled or not
+     *
+     * @see self::enablePTY()
+     * @see self::disablePTY()
+     *
+     * @access public
+     * @return bool
+     */
+    function isPTYEnabled()
+    {
+        return $this->request_pty;
+    }
+
+    /**
+     * Gets channel data
+     *
+     * Returns the data as a string if it's available and false if not.
+     *
+     * @param $client_channel
+     * @return mixed
+     * @access private
+     */
+    function _get_channel_packet($client_channel, $skip_extended = false)
+    {
+        if (!empty($this->channel_buffers[$client_channel])) {
+            return array_shift($this->channel_buffers[$client_channel]);
+        }
+
+        while (true) {
+            if ($this->binary_packet_buffer !== false) {
+                $response = $this->binary_packet_buffer;
+                $this->binary_packet_buffer = false;
+            } else {
+                $read = array($this->fsock);
+                $write = $except = null;
+
+                if (!$this->curTimeout) {
+                    @stream_select($read, $write, $except, null);
+                } else {
+                    if ($this->curTimeout < 0) {
+                        $this->is_timeout = true;
+                        return true;
+                    }
+
+                    $read = array($this->fsock);
+                    $write = $except = null;
+
+                    $start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838
+                    $sec = floor($this->curTimeout);
+                    $usec = 1000000 * ($this->curTimeout - $sec);
+                    // on windows this returns a "Warning: Invalid CRT parameters detected" error
+                    if (!@stream_select($read, $write, $except, $sec, $usec) && !count($read)) {
+                        $this->is_timeout = true;
+                        return true;
+                    }
+                    $elapsed = strtok(microtime(), ' ') + strtok('') - $start;
+                    $this->curTimeout-= $elapsed;
+                }
+
+                $response = $this->_get_binary_packet(true);
+                if ($response === false) {
+                    $this->bitmap = 0;
+                    user_error('Connection closed by server');
+                    return false;
+                }
+            }
+
+            if ($client_channel == -1 && $response === true) {
+                return true;
+            }
+            if (!strlen($response)) {
+                return false;
+            }
+            extract(unpack('Ctype', $this->_string_shift($response, 1)));
+
+            if (strlen($response) < 4) {
+                return false;
+            }
+            if ($type == NET_SSH2_MSG_CHANNEL_OPEN) {
+                extract(unpack('Nlength', $this->_string_shift($response, 4)));
+            } else {
+                extract(unpack('Nchannel', $this->_string_shift($response, 4)));
+            }
+
+            // will not be setup yet on incoming channel open request
+            if (isset($channel) && isset($this->channel_status[$channel]) && isset($this->window_size_server_to_client[$channel])) {
+                $this->window_size_server_to_client[$channel]-= strlen($response);
+
+                // resize the window, if appropriate
+                if ($this->window_size_server_to_client[$channel] < 0) {
+                    $packet = pack('CNN', NET_SSH2_MSG_CHANNEL_WINDOW_ADJUST, $this->server_channels[$channel], $this->window_size);
+                    if (!$this->_send_binary_packet($packet)) {
+                        return false;
+                    }
+                    $this->window_size_server_to_client[$channel]+= $this->window_size;
+                }
+
+                switch ($type) {
+                    case NET_SSH2_MSG_CHANNEL_EXTENDED_DATA:
+                        /*
+                        if ($client_channel == NET_SSH2_CHANNEL_EXEC) {
+                            $this->_send_channel_packet($client_channel, chr(0));
+                        }
+                        */
+                        // currently, there's only one possible value for $data_type_code: NET_SSH2_EXTENDED_DATA_STDERR
+                        if (strlen($response) < 8) {
+                            return false;
+                        }
+                        extract(unpack('Ndata_type_code/Nlength', $this->_string_shift($response, 8)));
+                        $data = $this->_string_shift($response, $length);
+                        $this->stdErrorLog.= $data;
+                        if ($skip_extended || $this->quiet_mode) {
+                            continue 2;
+                        }
+                        if ($client_channel == $channel && $this->channel_status[$channel] == NET_SSH2_MSG_CHANNEL_DATA) {
+                            return $data;
+                        }
+                        if (!isset($this->channel_buffers[$channel])) {
+                            $this->channel_buffers[$channel] = array();
+                        }
+                        $this->channel_buffers[$channel][] = $data;
+
+                        continue 2;
+                    case NET_SSH2_MSG_CHANNEL_REQUEST:
+                        if ($this->channel_status[$channel] == NET_SSH2_MSG_CHANNEL_CLOSE) {
+                            continue 2;
+                        }
+                        if (strlen($response) < 4) {
+                            return false;
+                        }
+                        extract(unpack('Nlength', $this->_string_shift($response, 4)));
+                        $value = $this->_string_shift($response, $length);
+                        switch ($value) {
+                            case 'exit-signal':
+                                $this->_string_shift($response, 1);
+                                if (strlen($response) < 4) {
+                                    return false;
+                                }
+                                extract(unpack('Nlength', $this->_string_shift($response, 4)));
+                                $this->errors[] = 'SSH_MSG_CHANNEL_REQUEST (exit-signal): ' . $this->_string_shift($response, $length);
+                                $this->_string_shift($response, 1);
+                                if (strlen($response) < 4) {
+                                    return false;
+                                }
+                                extract(unpack('Nlength', $this->_string_shift($response, 4)));
+                                if ($length) {
+                                    $this->errors[count($this->errors)].= "\r\n" . $this->_string_shift($response, $length);
+                                }
+
+                                $this->_send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_EOF, $this->server_channels[$client_channel]));
+                                $this->_send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_CLOSE, $this->server_channels[$channel]));
+
+                                $this->channel_status[$channel] = NET_SSH2_MSG_CHANNEL_EOF;
+
+                                continue 3;
+                            case 'exit-status':
+                                if (strlen($response) < 5) {
+                                    return false;
+                                }
+                                extract(unpack('Cfalse/Nexit_status', $this->_string_shift($response, 5)));
+                                $this->exit_status = $exit_status;
+
+                                // "The client MAY ignore these messages."
+                                // -- http://tools.ietf.org/html/rfc4254#section-6.10
+
+                                continue 3;
+                            default:
+                                // "Some systems may not implement signals, in which case they SHOULD ignore this message."
+                                //  -- http://tools.ietf.org/html/rfc4254#section-6.9
+                                continue 3;
+                        }
+                }
+
+                switch ($this->channel_status[$channel]) {
+                    case NET_SSH2_MSG_CHANNEL_OPEN:
+                        switch ($type) {
+                            case NET_SSH2_MSG_CHANNEL_OPEN_CONFIRMATION:
+                                if (strlen($response) < 4) {
+                                    return false;
+                                }
+                                extract(unpack('Nserver_channel', $this->_string_shift($response, 4)));
+                                $this->server_channels[$channel] = $server_channel;
+                                if (strlen($response) < 4) {
+                                    return false;
+                                }
+                                extract(unpack('Nwindow_size', $this->_string_shift($response, 4)));
+                                if ($window_size < 0) {
+                                    $window_size&= 0x7FFFFFFF;
+                                    $window_size+= 0x80000000;
+                                }
+                                $this->window_size_client_to_server[$channel] = $window_size;
+                                if (strlen($response) < 4) {
+                                     return false;
+                                }
+                                $temp = unpack('Npacket_size_client_to_server', $this->_string_shift($response, 4));
+                                $this->packet_size_client_to_server[$channel] = $temp['packet_size_client_to_server'];
+                                $result = $client_channel == $channel ? true : $this->_get_channel_packet($client_channel, $skip_extended);
+                                $this->_on_channel_open();
+                                return $result;
+                            //case NET_SSH2_MSG_CHANNEL_OPEN_FAILURE:
+                            default:
+                                user_error('Unable to open channel');
+                                return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION);
+                        }
+                        break;
+                    case NET_SSH2_MSG_CHANNEL_REQUEST:
+                        switch ($type) {
+                            case NET_SSH2_MSG_CHANNEL_SUCCESS:
+                                return true;
+                            case NET_SSH2_MSG_CHANNEL_FAILURE:
+                                return false;
+                            default:
+                                user_error('Unable to fulfill channel request');
+                                return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION);
+                        }
+                    case NET_SSH2_MSG_CHANNEL_CLOSE:
+                        return $type == NET_SSH2_MSG_CHANNEL_CLOSE ? true : $this->_get_channel_packet($client_channel, $skip_extended);
+                }
+            }
+
+            // ie. $this->channel_status[$channel] == NET_SSH2_MSG_CHANNEL_DATA
+
+            switch ($type) {
+                case NET_SSH2_MSG_CHANNEL_DATA:
+                    /*
+                    if ($channel == NET_SSH2_CHANNEL_EXEC) {
+                        // SCP requires null packets, such as this, be sent.  further, in the case of the ssh.com SSH server
+                        // this actually seems to make things twice as fast.  more to the point, the message right after
+                        // SSH_MSG_CHANNEL_DATA (usually SSH_MSG_IGNORE) won't block for as long as it would have otherwise.
+                        // in OpenSSH it slows things down but only by a couple thousandths of a second.
+                        $this->_send_channel_packet($channel, chr(0));
+                    }
+                    */
+                    if (strlen($response) < 4) {
+                        return false;
+                    }
+                    extract(unpack('Nlength', $this->_string_shift($response, 4)));
+                    $data = $this->_string_shift($response, $length);
+
+                    if ($channel == NET_SSH2_CHANNEL_AGENT_FORWARD) {
+                        $agent_response = $this->agent->_forward_data($data);
+                        if (!is_bool($agent_response)) {
+                            $this->_send_channel_packet($channel, $agent_response);
+                        }
+                        break;
+                    }
+
+                    if ($client_channel == $channel) {
+                        return $data;
+                    }
+                    if (!isset($this->channel_buffers[$channel])) {
+                        $this->channel_buffers[$channel] = array();
+                    }
+                    $this->channel_buffers[$channel][] = $data;
+                    break;
+                case NET_SSH2_MSG_CHANNEL_CLOSE:
+                    $this->curTimeout = 0;
+
+                    if ($this->bitmap & NET_SSH2_MASK_SHELL) {
+                        $this->bitmap&= ~NET_SSH2_MASK_SHELL;
+                    }
+                    if ($this->channel_status[$channel] != NET_SSH2_MSG_CHANNEL_EOF) {
+                        $this->_send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_CLOSE, $this->server_channels[$channel]));
+                    }
+
+                    $this->channel_status[$channel] = NET_SSH2_MSG_CHANNEL_CLOSE;
+                    if ($client_channel == $channel) {
+                        return true;
+                    }
+                case NET_SSH2_MSG_CHANNEL_EOF:
+                    break;
+                default:
+                    user_error('Error reading channel data');
+                    return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION);
+            }
+        }
+    }
+
+    /**
+     * Sends Binary Packets
+     *
+     * See '6. Binary Packet Protocol' of rfc4253 for more info.
+     *
+     * @param string $data
+     * @param string $logged
+     * @see self::_get_binary_packet()
+     * @return bool
+     * @access private
+     */
+    function _send_binary_packet($data, $logged = null)
+    {
+        if (!is_resource($this->fsock) || feof($this->fsock)) {
+            $this->bitmap = 0;
+            user_error('Connection closed prematurely');
+            return false;
+        }
+
+        //if ($this->compress) {
+        //    // the -4 removes the checksum:
+        //    // http://php.net/function.gzcompress#57710
+        //    $data = substr(gzcompress($data), 0, -4);
+        //}
+
+        // 4 (packet length) + 1 (padding length) + 4 (minimal padding amount) == 9
+        $packet_length = strlen($data) + 9;
+        // round up to the nearest $this->encrypt_block_size
+        $packet_length+= (($this->encrypt_block_size - 1) * $packet_length) % $this->encrypt_block_size;
+        // subtracting strlen($data) is obvious - subtracting 5 is necessary because of packet_length and padding_length
+        $padding_length = $packet_length - strlen($data) - 5;
+        $padding = crypt_random_string($padding_length);
+
+        // we subtract 4 from packet_length because the packet_length field isn't supposed to include itself
+        $packet = pack('NCa*', $packet_length - 4, $padding_length, $data . $padding);
+
+        $hmac = $this->hmac_create !== false ? $this->hmac_create->hash(pack('Na*', $this->send_seq_no, $packet)) : '';
+        $this->send_seq_no++;
+
+        if ($this->encrypt !== false) {
+            $packet = $this->encrypt->encrypt($packet);
+        }
+
+        $packet.= $hmac;
+
+        $start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838
+        $result = strlen($packet) == fputs($this->fsock, $packet);
+        $stop = strtok(microtime(), ' ') + strtok('');
+
+        if (defined('NET_SSH2_LOGGING')) {
+            $current = strtok(microtime(), ' ') + strtok('');
+            $message_number = isset($this->message_numbers[ord($data[0])]) ? $this->message_numbers[ord($data[0])] : 'UNKNOWN (' . ord($data[0]) . ')';
+            $message_number = '-> ' . $message_number .
+                              ' (since last: ' . round($current - $this->last_packet, 4) . ', network: ' . round($stop - $start, 4) . 's)';
+            $this->_append_log($message_number, isset($logged) ? $logged : $data);
+            $this->last_packet = $current;
+        }
+
+        return $result;
+    }
+
+    /**
+     * Logs data packets
+     *
+     * Makes sure that only the last 1MB worth of packets will be logged
+     *
+     * @param string $data
+     * @access private
+     */
+    function _append_log($message_number, $message)
+    {
+        // remove the byte identifying the message type from all but the first two messages (ie. the identification strings)
+        if (strlen($message_number) > 2) {
+            $this->_string_shift($message);
+        }
+
+        switch (NET_SSH2_LOGGING) {
+            // useful for benchmarks
+            case NET_SSH2_LOG_SIMPLE:
+                $this->message_number_log[] = $message_number;
+                break;
+            // the most useful log for SSH2
+            case NET_SSH2_LOG_COMPLEX:
+                $this->message_number_log[] = $message_number;
+                $this->log_size+= strlen($message);
+                $this->message_log[] = $message;
+                while ($this->log_size > NET_SSH2_LOG_MAX_SIZE) {
+                    $this->log_size-= strlen(array_shift($this->message_log));
+                    array_shift($this->message_number_log);
+                }
+                break;
+            // dump the output out realtime; packets may be interspersed with non packets,
+            // passwords won't be filtered out and select other packets may not be correctly
+            // identified
+            case NET_SSH2_LOG_REALTIME:
+                switch (PHP_SAPI) {
+                    case 'cli':
+                        $start = $stop = "\r\n";
+                        break;
+                    default:
+                        $start = '<pre>';
+                        $stop = '</pre>';
+                }
+                echo $start . $this->_format_log(array($message), array($message_number)) . $stop;
+                @flush();
+                @ob_flush();
+                break;
+            // basically the same thing as NET_SSH2_LOG_REALTIME with the caveat that NET_SSH2_LOG_REALTIME_FILE
+            // needs to be defined and that the resultant log file will be capped out at NET_SSH2_LOG_MAX_SIZE.
+            // the earliest part of the log file is denoted by the first <<< START >>> and is not going to necessarily
+            // at the beginning of the file
+            case NET_SSH2_LOG_REALTIME_FILE:
+                if (!isset($this->realtime_log_file)) {
+                    // PHP doesn't seem to like using constants in fopen()
+                    $filename = NET_SSH2_LOG_REALTIME_FILENAME;
+                    $fp = fopen($filename, 'w');
+                    $this->realtime_log_file = $fp;
+                }
+                if (!is_resource($this->realtime_log_file)) {
+                    break;
+                }
+                $entry = $this->_format_log(array($message), array($message_number));
+                if ($this->realtime_log_wrap) {
+                    $temp = "<<< START >>>\r\n";
+                    $entry.= $temp;
+                    fseek($this->realtime_log_file, ftell($this->realtime_log_file) - strlen($temp));
+                }
+                $this->realtime_log_size+= strlen($entry);
+                if ($this->realtime_log_size > NET_SSH2_LOG_MAX_SIZE) {
+                    fseek($this->realtime_log_file, 0);
+                    $this->realtime_log_size = strlen($entry);
+                    $this->realtime_log_wrap = true;
+                }
+                fputs($this->realtime_log_file, $entry);
+        }
+    }
+
+    /**
+     * Sends channel data
+     *
+     * Spans multiple SSH_MSG_CHANNEL_DATAs if appropriate
+     *
+     * @param int $client_channel
+     * @param string $data
+     * @return bool
+     * @access private
+     */
+    function _send_channel_packet($client_channel, $data)
+    {
+        while (strlen($data)) {
+            if (!$this->window_size_client_to_server[$client_channel]) {
+                $this->bitmap^= NET_SSH2_MASK_WINDOW_ADJUST;
+                // using an invalid channel will let the buffers be built up for the valid channels
+                $this->_get_channel_packet(-1);
+                $this->bitmap^= NET_SSH2_MASK_WINDOW_ADJUST;
+            }
+
+            /* The maximum amount of data allowed is determined by the maximum
+               packet size for the channel, and the current window size, whichever
+               is smaller.
+                 -- http://tools.ietf.org/html/rfc4254#section-5.2 */
+            $max_size = min(
+                $this->packet_size_client_to_server[$client_channel],
+                $this->window_size_client_to_server[$client_channel]
+            );
+
+            $temp = $this->_string_shift($data, $max_size);
+            $packet = pack(
+                'CN2a*',
+                NET_SSH2_MSG_CHANNEL_DATA,
+                $this->server_channels[$client_channel],
+                strlen($temp),
+                $temp
+            );
+            $this->window_size_client_to_server[$client_channel]-= strlen($temp);
+            if (!$this->_send_binary_packet($packet)) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    /**
+     * Closes and flushes a channel
+     *
+     * Net_SSH2 doesn't properly close most channels.  For exec() channels are normally closed by the server
+     * and for SFTP channels are presumably closed when the client disconnects.  This functions is intended
+     * for SCP more than anything.
+     *
+     * @param int $client_channel
+     * @param bool $want_reply
+     * @return bool
+     * @access private
+     */
+    function _close_channel($client_channel, $want_reply = false)
+    {
+        // see http://tools.ietf.org/html/rfc4254#section-5.3
+
+        $this->_send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_EOF, $this->server_channels[$client_channel]));
+
+        if (!$want_reply) {
+            $this->_send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_CLOSE, $this->server_channels[$client_channel]));
+        }
+
+        $this->channel_status[$client_channel] = NET_SSH2_MSG_CHANNEL_CLOSE;
+
+        $this->curTimeout = 0;
+
+        while (!is_bool($this->_get_channel_packet($client_channel))) {
+        }
+
+        if ($want_reply) {
+            $this->_send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_CLOSE, $this->server_channels[$client_channel]));
+        }
+
+        if ($this->bitmap & NET_SSH2_MASK_SHELL) {
+            $this->bitmap&= ~NET_SSH2_MASK_SHELL;
+        }
+    }
+
+    /**
+     * Disconnect
+     *
+     * @param int $reason
+     * @return bool
+     * @access private
+     */
+    function _disconnect($reason)
+    {
+        if ($this->bitmap & NET_SSH2_MASK_CONNECTED) {
+            $data = pack('CNNa*Na*', NET_SSH2_MSG_DISCONNECT, $reason, 0, '', 0, '');
+            $this->_send_binary_packet($data);
+            $this->bitmap = 0;
+            fclose($this->fsock);
+            return false;
+        }
+    }
+
+    /**
+     * String Shift
+     *
+     * Inspired by array_shift
+     *
+     * @param string $string
+     * @param int $index
+     * @return string
+     * @access private
+     */
+    function _string_shift(&$string, $index = 1)
+    {
+        $substr = substr($string, 0, $index);
+        $string = substr($string, $index);
+        return $substr;
+    }
+
+    /**
+     * Define Array
+     *
+     * Takes any number of arrays whose indices are integers and whose values are strings and defines a bunch of
+     * named constants from it, using the value as the name of the constant and the index as the value of the constant.
+     * If any of the constants that would be defined already exists, none of the constants will be defined.
+     *
+     * @param array $array
+     * @access private
+     */
+    function _define_array()
+    {
+        $args = func_get_args();
+        foreach ($args as $arg) {
+            foreach ($arg as $key => $value) {
+                if (!defined($value)) {
+                    define($value, $key);
+                } else {
+                    break 2;
+                }
+            }
+        }
+    }
+
+    /**
+     * Returns a log of the packets that have been sent and received.
+     *
+     * Returns a string if NET_SSH2_LOGGING == NET_SSH2_LOG_COMPLEX, an array if NET_SSH2_LOGGING == NET_SSH2_LOG_SIMPLE and false if !defined('NET_SSH2_LOGGING')
+     *
+     * @access public
+     * @return array|false|string
+     */
+    function getLog()
+    {
+        if (!defined('NET_SSH2_LOGGING')) {
+            return false;
+        }
+
+        switch (NET_SSH2_LOGGING) {
+            case NET_SSH2_LOG_SIMPLE:
+                return $this->message_number_log;
+            case NET_SSH2_LOG_COMPLEX:
+                $log = $this->_format_log($this->message_log, $this->message_number_log);
+                return PHP_SAPI == 'cli' ? $log : '<pre>' . $log . '</pre>';
+            default:
+                return false;
+        }
+    }
+
+    /**
+     * Formats a log for printing
+     *
+     * @param array $message_log
+     * @param array $message_number_log
+     * @access private
+     * @return string
+     */
+    function _format_log($message_log, $message_number_log)
+    {
+        $output = '';
+        for ($i = 0; $i < count($message_log); $i++) {
+            $output.= $message_number_log[$i] . "\r\n";
+            $current_log = $message_log[$i];
+            $j = 0;
+            do {
+                if (strlen($current_log)) {
+                    $output.= str_pad(dechex($j), 7, '0', STR_PAD_LEFT) . '0  ';
+                }
+                $fragment = $this->_string_shift($current_log, $this->log_short_width);
+                $hex = substr(preg_replace_callback('#.#s', array($this, '_format_log_helper'), $fragment), strlen($this->log_boundary));
+                // replace non ASCII printable characters with dots
+                // http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters
+                // also replace < with a . since < messes up the output on web browsers
+                $raw = preg_replace('#[^\x20-\x7E]|<#', '.', $fragment);
+                $output.= str_pad($hex, $this->log_long_width - $this->log_short_width, ' ') . $raw . "\r\n";
+                $j++;
+            } while (strlen($current_log));
+            $output.= "\r\n";
+        }
+
+        return $output;
+    }
+
+    /**
+     * Helper function for _format_log
+     *
+     * For use with preg_replace_callback()
+     *
+     * @param array $matches
+     * @access private
+     * @return string
+     */
+    function _format_log_helper($matches)
+    {
+        return $this->log_boundary . str_pad(dechex(ord($matches[0])), 2, '0', STR_PAD_LEFT);
+    }
+
+    /**
+     * Helper function for agent->_on_channel_open()
+     *
+     * Used when channels are created to inform agent
+     * of said channel opening. Must be called after
+     * channel open confirmation received
+     *
+     * @access private
+     */
+    function _on_channel_open()
+    {
+        if (isset($this->agent)) {
+            $this->agent->_on_channel_open($this);
+        }
+    }
+
+    /**
+     * Returns the first value of the intersection of two arrays or false if
+     * the intersection is empty. The order is defined by the first parameter.
+     *
+     * @param array $array1
+     * @param array $array2
+     * @return mixed False if intersection is empty, else intersected value.
+     * @access private
+     */
+    function _array_intersect_first($array1, $array2)
+    {
+        foreach ($array1 as $value) {
+            if (in_array($value, $array2)) {
+                return $value;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Returns all errors
+     *
+     * @return string[]
+     * @access public
+     */
+    function getErrors()
+    {
+        return $this->errors;
+    }
+
+    /**
+     * Returns the last error
+     *
+     * @return string
+     * @access public
+     */
+    function getLastError()
+    {
+        $count = count($this->errors);
+
+        if ($count > 0) {
+            return $this->errors[$count - 1];
+        }
+    }
+
+    /**
+     * Return the server identification.
+     *
+     * @return string
+     * @access public
+     */
+    function getServerIdentification()
+    {
+        $this->_connect();
+
+        return $this->server_identifier;
+    }
+
+    /**
+     * Return a list of the key exchange algorithms the server supports.
+     *
+     * @return array
+     * @access public
+     */
+    function getKexAlgorithms()
+    {
+        $this->_connect();
+
+        return $this->kex_algorithms;
+    }
+
+    /**
+     * Return a list of the host key (public key) algorithms the server supports.
+     *
+     * @return array
+     * @access public
+     */
+    function getServerHostKeyAlgorithms()
+    {
+        $this->_connect();
+
+        return $this->server_host_key_algorithms;
+    }
+
+    /**
+     * Return a list of the (symmetric key) encryption algorithms the server supports, when receiving stuff from the client.
+     *
+     * @return array
+     * @access public
+     */
+    function getEncryptionAlgorithmsClient2Server()
+    {
+        $this->_connect();
+
+        return $this->encryption_algorithms_client_to_server;
+    }
+
+    /**
+     * Return a list of the (symmetric key) encryption algorithms the server supports, when sending stuff to the client.
+     *
+     * @return array
+     * @access public
+     */
+    function getEncryptionAlgorithmsServer2Client()
+    {
+        $this->_connect();
+
+        return $this->encryption_algorithms_server_to_client;
+    }
+
+    /**
+     * Return a list of the MAC algorithms the server supports, when receiving stuff from the client.
+     *
+     * @return array
+     * @access public
+     */
+    function getMACAlgorithmsClient2Server()
+    {
+        $this->_connect();
+
+        return $this->mac_algorithms_client_to_server;
+    }
+
+    /**
+     * Return a list of the MAC algorithms the server supports, when sending stuff to the client.
+     *
+     * @return array
+     * @access public
+     */
+    function getMACAlgorithmsServer2Client()
+    {
+        $this->_connect();
+
+        return $this->mac_algorithms_server_to_client;
+    }
+
+    /**
+     * Return a list of the compression algorithms the server supports, when receiving stuff from the client.
+     *
+     * @return array
+     * @access public
+     */
+    function getCompressionAlgorithmsClient2Server()
+    {
+        $this->_connect();
+
+        return $this->compression_algorithms_client_to_server;
+    }
+
+    /**
+     * Return a list of the compression algorithms the server supports, when sending stuff to the client.
+     *
+     * @return array
+     * @access public
+     */
+    function getCompressionAlgorithmsServer2Client()
+    {
+        $this->_connect();
+
+        return $this->compression_algorithms_server_to_client;
+    }
+
+    /**
+     * Return a list of the languages the server supports, when sending stuff to the client.
+     *
+     * @return array
+     * @access public
+     */
+    function getLanguagesServer2Client()
+    {
+        $this->_connect();
+
+        return $this->languages_server_to_client;
+    }
+
+    /**
+     * Return a list of the languages the server supports, when receiving stuff from the client.
+     *
+     * @return array
+     * @access public
+     */
+    function getLanguagesClient2Server()
+    {
+        $this->_connect();
+
+        return $this->languages_client_to_server;
+    }
+
+    /**
+     * Returns the banner message.
+     *
+     * Quoting from the RFC, "in some jurisdictions, sending a warning message before
+     * authentication may be relevant for getting legal protection."
+     *
+     * @return string
+     * @access public
+     */
+    function getBannerMessage()
+    {
+        return $this->banner_message;
+    }
+
+    /**
+     * Returns the server public host key.
+     *
+     * Caching this the first time you connect to a server and checking the result on subsequent connections
+     * is recommended.  Returns false if the server signature is not signed correctly with the public host key.
+     *
+     * @return mixed
+     * @access public
+     */
+    function getServerPublicHostKey()
+    {
+        if (!($this->bitmap & NET_SSH2_MASK_CONSTRUCTOR)) {
+            if (!$this->_connect()) {
+                return false;
+            }
+        }
+
+        $signature = $this->signature;
+        $server_public_host_key = $this->server_public_host_key;
+
+        if (strlen($server_public_host_key) < 4) {
+            return false;
+        }
+        extract(unpack('Nlength', $this->_string_shift($server_public_host_key, 4)));
+        $this->_string_shift($server_public_host_key, $length);
+
+        if ($this->signature_validated) {
+            return $this->bitmap ?
+                $this->signature_format . ' ' . base64_encode($this->server_public_host_key) :
+                false;
+        }
+
+        $this->signature_validated = true;
+
+        switch ($this->signature_format) {
+            case 'ssh-dss':
+                $zero = new Math_BigInteger();
+
+                if (strlen($server_public_host_key) < 4) {
+                    return false;
+                }
+                $temp = unpack('Nlength', $this->_string_shift($server_public_host_key, 4));
+                $p = new Math_BigInteger($this->_string_shift($server_public_host_key, $temp['length']), -256);
+
+                if (strlen($server_public_host_key) < 4) {
+                    return false;
+                }
+                $temp = unpack('Nlength', $this->_string_shift($server_public_host_key, 4));
+                $q = new Math_BigInteger($this->_string_shift($server_public_host_key, $temp['length']), -256);
+
+                if (strlen($server_public_host_key) < 4) {
+                    return false;
+                }
+                $temp = unpack('Nlength', $this->_string_shift($server_public_host_key, 4));
+                $g = new Math_BigInteger($this->_string_shift($server_public_host_key, $temp['length']), -256);
+
+                if (strlen($server_public_host_key) < 4) {
+                    return false;
+                }
+                $temp = unpack('Nlength', $this->_string_shift($server_public_host_key, 4));
+                $y = new Math_BigInteger($this->_string_shift($server_public_host_key, $temp['length']), -256);
+
+                /* The value for 'dss_signature_blob' is encoded as a string containing
+                   r, followed by s (which are 160-bit integers, without lengths or
+                   padding, unsigned, and in network byte order). */
+                $temp = unpack('Nlength', $this->_string_shift($signature, 4));
+                if ($temp['length'] != 40) {
+                    user_error('Invalid signature');
+                    return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
+                }
+
+                $r = new Math_BigInteger($this->_string_shift($signature, 20), 256);
+                $s = new Math_BigInteger($this->_string_shift($signature, 20), 256);
+
+                switch (true) {
+                    case $r->equals($zero):
+                    case $r->compare($q) >= 0:
+                    case $s->equals($zero):
+                    case $s->compare($q) >= 0:
+                        user_error('Invalid signature');
+                        return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
+                }
+
+                $w = $s->modInverse($q);
+
+                $u1 = $w->multiply(new Math_BigInteger(sha1($this->exchange_hash), 16));
+                list(, $u1) = $u1->divide($q);
+
+                $u2 = $w->multiply($r);
+                list(, $u2) = $u2->divide($q);
+
+                $g = $g->modPow($u1, $p);
+                $y = $y->modPow($u2, $p);
+
+                $v = $g->multiply($y);
+                list(, $v) = $v->divide($p);
+                list(, $v) = $v->divide($q);
+
+                if (!$v->equals($r)) {
+                    user_error('Bad server signature');
+                    return $this->_disconnect(NET_SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE);
+                }
+
+                break;
+            case 'ssh-rsa':
+            case 'rsa-sha2-256':
+            case 'rsa-sha2-512':
+                if (strlen($server_public_host_key) < 4) {
+                    return false;
+                }
+                $temp = unpack('Nlength', $this->_string_shift($server_public_host_key, 4));
+                $e = new Math_BigInteger($this->_string_shift($server_public_host_key, $temp['length']), -256);
+
+                if (strlen($server_public_host_key) < 4) {
+                    return false;
+                }
+                $temp = unpack('Nlength', $this->_string_shift($server_public_host_key, 4));
+                $rawN = $this->_string_shift($server_public_host_key, $temp['length']);
+                $n = new Math_BigInteger($rawN, -256);
+                $nLength = strlen(ltrim($rawN, "\0"));
+
+                /*
+                if (strlen($signature) < 4) {
+                    return false;
+                }
+                $temp = unpack('Nlength', $this->_string_shift($signature, 4));
+                $signature = $this->_string_shift($signature, $temp['length']);
+
+                if (!class_exists('Crypt_RSA')) {
+                    include_once 'Crypt/RSA.php';
+                }
+
+                $rsa = new Crypt_RSA();
+                switch ($this->signature_format) {
+                    case 'rsa-sha2-512':
+                        $hash = 'sha512';
+                        break;
+                    case 'rsa-sha2-256':
+                        $hash = 'sha256';
+                        break;
+                    //case 'ssh-rsa':
+                    default:
+                        $hash = 'sha1';
+                }
+                $rsa->setHash($hash);
+                $rsa->setSignatureMode(CRYPT_RSA_SIGNATURE_PKCS1);
+                $rsa->loadKey(array('e' => $e, 'n' => $n), CRYPT_RSA_PUBLIC_FORMAT_RAW);
+                if (!$rsa->verify($this->exchange_hash, $signature)) {
+                    user_error('Bad server signature');
+                    return $this->_disconnect(NET_SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE);
+                }
+                */
+
+                if (strlen($signature) < 4) {
+                    return false;
+                }
+                $temp = unpack('Nlength', $this->_string_shift($signature, 4));
+                $s = new Math_BigInteger($this->_string_shift($signature, $temp['length']), 256);
+
+                // validate an RSA signature per "8.2 RSASSA-PKCS1-v1_5", "5.2.2 RSAVP1", and "9.1 EMSA-PSS" in the
+                // following URL:
+                // ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-1/pkcs-1v2-1.pdf
+
+                // also, see SSHRSA.c (rsa2_verifysig) in PuTTy's source.
+
+                if ($s->compare(new Math_BigInteger()) < 0 || $s->compare($n->subtract(new Math_BigInteger(1))) > 0) {
+                    user_error('Invalid signature');
+                    return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
+                }
+
+                $s = $s->modPow($e, $n);
+                $s = $s->toBytes();
+
+                switch ($this->signature_format) {
+                    case 'rsa-sha2-512':
+                        $hash = 'sha512';
+                        break;
+                    case 'rsa-sha2-256':
+                        $hash = 'sha256';
+                        break;
+                    //case 'ssh-rsa':
+                    default:
+                        $hash = 'sha1';
+                }
+                $hashObj = new Crypt_Hash($hash);
+                switch ($this->signature_format) {
+                    case 'rsa-sha2-512':
+                        $h = pack('N5a*', 0x00305130, 0x0D060960, 0x86480165, 0x03040203, 0x05000440, $hashObj->hash($this->exchange_hash));
+                        break;
+                    case 'rsa-sha2-256':
+                        $h = pack('N5a*', 0x00303130, 0x0D060960, 0x86480165, 0x03040201, 0x05000420, $hashObj->hash($this->exchange_hash));
+                        break;
+                    //case 'ssh-rsa':
+                    default:
+                        $hash = 'sha1';
+                        $h = pack('N4a*', 0x00302130, 0x0906052B, 0x0E03021A, 0x05000414, $hashObj->hash($this->exchange_hash));
+                }
+                $h = chr(0x01) . str_repeat(chr(0xFF), $nLength - 2 - strlen($h)) . $h;
+
+                if ($s != $h) {
+                    user_error('Bad server signature');
+                    return $this->_disconnect(NET_SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE);
+                }
+                break;
+            default:
+                user_error('Unsupported signature format');
+                return $this->_disconnect(NET_SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE);
+        }
+
+        return $this->signature_format . ' ' . base64_encode($this->server_public_host_key);
+    }
+
+    /**
+     * Returns the exit status of an SSH command or false.
+     *
+     * @return false|int
+     * @access public
+     */
+    function getExitStatus()
+    {
+        if (is_null($this->exit_status)) {
+            return false;
+        }
+        return $this->exit_status;
+    }
+
+    /**
+     * Returns the number of columns for the terminal window size.
+     *
+     * @return int
+     * @access public
+     */
+    function getWindowColumns()
+    {
+        return $this->windowColumns;
+    }
+
+    /**
+     * Returns the number of rows for the terminal window size.
+     *
+     * @return int
+     * @access public
+     */
+    function getWindowRows()
+    {
+        return $this->windowRows;
+    }
+
+    /**
+     * Sets the number of columns for the terminal window size.
+     *
+     * @param int $value
+     * @access public
+     */
+    function setWindowColumns($value)
+    {
+        $this->windowColumns = $value;
+    }
+
+    /**
+     * Sets the number of rows for the terminal window size.
+     *
+     * @param int $value
+     * @access public
+     */
+    function setWindowRows($value)
+    {
+        $this->windowRows = $value;
+    }
+
+    /**
+     * Sets the number of columns and rows for the terminal window size.
+     *
+     * @param int $columns
+     * @param int $rows
+     * @access public
+     */
+    function setWindowSize($columns = 80, $rows = 24)
+    {
+        $this->windowColumns = $columns;
+        $this->windowRows = $rows;
+    }
+}
diff --git a/lib/php/phpseclib/System/SSH/Agent.php b/lib/php/phpseclib/System/SSH/Agent.php
new file mode 100644
index 00000000..c44ca406
--- /dev/null
+++ b/lib/php/phpseclib/System/SSH/Agent.php
@@ -0,0 +1,561 @@
+<?php
+
+/**
+ * Pure-PHP ssh-agent client.
+ *
+ * PHP versions 4 and 5
+ *
+ * Here are some examples of how to use this library:
+ * <code>
+ * <?php
+ *    include 'System/SSH/Agent.php';
+ *    include 'Net/SSH2.php';
+ *
+ *    $agent = new System_SSH_Agent();
+ *
+ *    $ssh = new Net_SSH2('www.domain.tld');
+ *    if (!$ssh->login('username', $agent)) {
+ *        exit('Login Failed');
+ *    }
+ *
+ *    echo $ssh->exec('pwd');
+ *    echo $ssh->exec('ls -la');
+ * ?>
+ * </code>
+ *
+ * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @category  System
+ * @package   System_SSH_Agent
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2014 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ * @internal  See http://api.libssh.org/rfc/PROTOCOL.agent
+ */
+
+/**#@+
+ * Message numbers
+ *
+ * @access private
+ */
+// to request SSH1 keys you have to use SSH_AGENTC_REQUEST_RSA_IDENTITIES (1)
+define('SYSTEM_SSH_AGENTC_REQUEST_IDENTITIES', 11);
+// this is the SSH2 response; the SSH1 response is SSH_AGENT_RSA_IDENTITIES_ANSWER (2).
+define('SYSTEM_SSH_AGENT_IDENTITIES_ANSWER', 12);
+define('SYSTEM_SSH_AGENT_FAILURE', 5);
+// the SSH1 request is SSH_AGENTC_RSA_CHALLENGE (3)
+define('SYSTEM_SSH_AGENTC_SIGN_REQUEST', 13);
+// the SSH1 response is SSH_AGENT_RSA_RESPONSE (4)
+define('SYSTEM_SSH_AGENT_SIGN_RESPONSE', 14);
+/**#@-*/
+
+/**@+
+ * Agent forwarding status
+ *
+ * @access private
+ */
+// no forwarding requested and not active
+define('SYSTEM_SSH_AGENT_FORWARD_NONE', 0);
+// request agent forwarding when opportune
+define('SYSTEM_SSH_AGENT_FORWARD_REQUEST', 1);
+// forwarding has been request and is active
+define('SYSTEM_SSH_AGENT_FORWARD_ACTIVE', 2);
+/**#@-*/
+
+/**@+
+ * Signature Flags
+ *
+ * See https://tools.ietf.org/html/draft-miller-ssh-agent-00#section-5.3
+ *
+ * @access private
+ */
+define('SYSTEM_SSH_AGENT_RSA2_256', 2);
+define('SYSTEM_SSH_AGENT_RSA2_512', 4);
+/**#@-*/
+
+/**
+ * Pure-PHP ssh-agent client identity object
+ *
+ * Instantiation should only be performed by System_SSH_Agent class.
+ * This could be thought of as implementing an interface that Crypt_RSA
+ * implements. ie. maybe a Net_SSH_Auth_PublicKey interface or something.
+ * The methods in this interface would be getPublicKey, setSignatureMode
+ * and sign since those are the methods phpseclib looks for to perform
+ * public key authentication.
+ *
+ * @package System_SSH_Agent
+ * @author  Jim Wigginton <terrafrost@php.net>
+ * @access  internal
+ */
+class System_SSH_Agent_Identity
+{
+    /**
+     * Key Object
+     *
+     * @var Crypt_RSA
+     * @access private
+     * @see self::getPublicKey()
+     */
+    var $key;
+
+    /**
+     * Key Blob
+     *
+     * @var string
+     * @access private
+     * @see self::sign()
+     */
+    var $key_blob;
+
+    /**
+     * Socket Resource
+     *
+     * @var resource
+     * @access private
+     * @see self::sign()
+     */
+    var $fsock;
+
+    /**
+     * Signature flags
+     *
+     * @var int
+     * @access private
+     * @see self::sign()
+     * @see self::setHash()
+     */
+    var $flags = 0;
+
+    /**
+     * Default Constructor.
+     *
+     * @param resource $fsock
+     * @return System_SSH_Agent_Identity
+     * @access private
+     */
+    function __construct($fsock)
+    {
+        $this->fsock = $fsock;
+    }
+
+    /**
+     * PHP4 compatible Default Constructor.
+     *
+     * @see self::__construct()
+     * @param resource $fsock
+     * @access public
+     */
+    function System_SSH_Agent_Identity($fsock)
+    {
+        $this->__construct($fsock);
+    }
+
+    /**
+     * Set Public Key
+     *
+     * Called by System_SSH_Agent::requestIdentities()
+     *
+     * @param Crypt_RSA $key
+     * @access private
+     */
+    function setPublicKey($key)
+    {
+        $this->key = $key;
+        $this->key->setPublicKey();
+    }
+
+    /**
+     * Set Public Key
+     *
+     * Called by System_SSH_Agent::requestIdentities(). The key blob could be extracted from $this->key
+     * but this saves a small amount of computation.
+     *
+     * @param string $key_blob
+     * @access private
+     */
+    function setPublicKeyBlob($key_blob)
+    {
+        $this->key_blob = $key_blob;
+    }
+
+    /**
+     * Get Public Key
+     *
+     * Wrapper for $this->key->getPublicKey()
+     *
+     * @param int $format optional
+     * @return mixed
+     * @access public
+     */
+    function getPublicKey($format = null)
+    {
+        return !isset($format) ? $this->key->getPublicKey() : $this->key->getPublicKey($format);
+    }
+
+    /**
+     * Set Signature Mode
+     *
+     * Doesn't do anything as ssh-agent doesn't let you pick and choose the signature mode. ie.
+     * ssh-agent's only supported mode is CRYPT_RSA_SIGNATURE_PKCS1
+     *
+     * @param int $mode
+     * @access public
+     */
+    function setSignatureMode($mode)
+    {
+    }
+
+    /**
+     * Set Hash
+     *
+     * ssh-agent doesn't support using hashes for RSA other than SHA1
+     *
+     * @param string $hash
+     * @access public
+     */
+    function setHash($hash)
+    {
+        $this->flags = 0;
+        switch ($hash) {
+            case 'sha1':
+                break;
+            case 'sha256':
+                $this->flags = SYSTEM_SSH_AGENT_RSA2_256;
+                break;
+            case 'sha512':
+                $this->flags = SYSTEM_SSH_AGENT_RSA2_512;
+                break;
+            default:
+                user_error('The only supported hashes for RSA are sha1, sha256 and sha512');
+        }
+    }
+
+    /**
+     * Create a signature
+     *
+     * See "2.6.2 Protocol 2 private key signature request"
+     *
+     * @param string $message
+     * @return string
+     * @access public
+     */
+    function sign($message)
+    {
+        // the last parameter (currently 0) is for flags and ssh-agent only defines one flag (for ssh-dss): SSH_AGENT_OLD_SIGNATURE
+        $packet = pack('CNa*Na*N', SYSTEM_SSH_AGENTC_SIGN_REQUEST, strlen($this->key_blob), $this->key_blob, strlen($message), $message, $this->flags);
+        $packet = pack('Na*', strlen($packet), $packet);
+        if (strlen($packet) != fputs($this->fsock, $packet)) {
+            user_error('Connection closed during signing');
+        }
+
+        $length = current(unpack('N', fread($this->fsock, 4)));
+        $type = ord(fread($this->fsock, 1));
+        if ($type != SYSTEM_SSH_AGENT_SIGN_RESPONSE) {
+            user_error('Unable to retreive signature');
+        }
+
+        $signature_blob = fread($this->fsock, $length - 1);
+        $length = current(unpack('N', $this->_string_shift($signature_blob, 4)));
+        if ($length != strlen($signature_blob)) {
+            user_error('Malformed signature blob');
+        }
+        $length = current(unpack('N', $this->_string_shift($signature_blob, 4)));
+        if ($length > strlen($signature_blob) + 4) {
+            user_error('Malformed signature blob');
+        }
+        $type = $this->_string_shift($signature_blob, $length);
+        $this->_string_shift($signature_blob, 4);
+
+        return $signature_blob;
+    }
+
+    /**
+     * String Shift
+     *
+     * Inspired by array_shift
+     *
+     * @param string $string
+     * @param int $index
+     * @return string
+     * @access private
+     */
+    function _string_shift(&$string, $index = 1)
+    {
+        $substr = substr($string, 0, $index);
+        $string = substr($string, $index);
+        return $substr;
+    }
+}
+
+/**
+ * Pure-PHP ssh-agent client identity factory
+ *
+ * requestIdentities() method pumps out System_SSH_Agent_Identity objects
+ *
+ * @package System_SSH_Agent
+ * @author  Jim Wigginton <terrafrost@php.net>
+ * @access  public
+ */
+class System_SSH_Agent
+{
+    /**
+     * Socket Resource
+     *
+     * @var resource
+     * @access private
+     */
+    var $fsock;
+
+    /**
+     * Agent forwarding status
+     *
+     * @access private
+     */
+    var $forward_status = SYSTEM_SSH_AGENT_FORWARD_NONE;
+
+    /**
+     * Buffer for accumulating forwarded authentication
+     * agent data arriving on SSH data channel destined
+     * for agent unix socket
+     *
+     * @access private
+     */
+    var $socket_buffer = '';
+
+    /**
+     * Tracking the number of bytes we are expecting
+     * to arrive for the agent socket on the SSH data
+     * channel
+     */
+    var $expected_bytes = 0;
+
+    /**
+     * Default Constructor
+     *
+     * @return System_SSH_Agent
+     * @access public
+     */
+    function __construct($address = null)
+    {
+        if (!$address) {
+            switch (true) {
+                case isset($_SERVER['SSH_AUTH_SOCK']):
+                    $address = $_SERVER['SSH_AUTH_SOCK'];
+                    break;
+                case isset($_ENV['SSH_AUTH_SOCK']):
+                    $address = $_ENV['SSH_AUTH_SOCK'];
+                    break;
+                default:
+                    user_error('SSH_AUTH_SOCK not found');
+                    return false;
+            }
+        }
+
+        $this->fsock = fsockopen('unix://' . $address, 0, $errno, $errstr);
+        if (!$this->fsock) {
+            user_error("Unable to connect to ssh-agent (Error $errno: $errstr)");
+        }
+    }
+
+    /**
+     * PHP4 compatible Default Constructor.
+     *
+     * @see self::__construct()
+     * @access public
+     */
+    function System_SSH_Agent($address = null)
+    {
+        $this->__construct($address);
+    }
+
+    /**
+     * Request Identities
+     *
+     * See "2.5.2 Requesting a list of protocol 2 keys"
+     * Returns an array containing zero or more System_SSH_Agent_Identity objects
+     *
+     * @return array
+     * @access public
+     */
+    function requestIdentities()
+    {
+        if (!$this->fsock) {
+            return array();
+        }
+
+        $packet = pack('NC', 1, SYSTEM_SSH_AGENTC_REQUEST_IDENTITIES);
+        if (strlen($packet) != fputs($this->fsock, $packet)) {
+            user_error('Connection closed while requesting identities');
+            return array();
+        }
+
+        $length = current(unpack('N', fread($this->fsock, 4)));
+        $type = ord(fread($this->fsock, 1));
+        if ($type != SYSTEM_SSH_AGENT_IDENTITIES_ANSWER) {
+            user_error('Unable to request identities');
+            return array();
+        }
+
+        $identities = array();
+        $keyCount = current(unpack('N', fread($this->fsock, 4)));
+        for ($i = 0; $i < $keyCount; $i++) {
+            $length = current(unpack('N', fread($this->fsock, 4)));
+            $key_blob = fread($this->fsock, $length);
+            $key_str = 'ssh-rsa ' . base64_encode($key_blob);
+            $length = current(unpack('N', fread($this->fsock, 4)));
+            if ($length) {
+                $key_str.= ' ' . fread($this->fsock, $length);
+            }
+            $length = current(unpack('N', substr($key_blob, 0, 4)));
+            $key_type = substr($key_blob, 4, $length);
+            switch ($key_type) {
+                case 'ssh-rsa':
+                    if (!class_exists('Crypt_RSA')) {
+                        include_once 'Crypt/RSA.php';
+                    }
+                    $key = new Crypt_RSA();
+                    $key->loadKey($key_str);
+                    break;
+                case 'ssh-dss':
+                    // not currently supported
+                    break;
+            }
+            // resources are passed by reference by default
+            if (isset($key)) {
+                $identity = new System_SSH_Agent_Identity($this->fsock);
+                $identity->setPublicKey($key);
+                $identity->setPublicKeyBlob($key_blob);
+                $identities[] = $identity;
+                unset($key);
+            }
+        }
+
+        return $identities;
+    }
+
+    /**
+     * Signal that agent forwarding should
+     * be requested when a channel is opened
+     *
+     * @param Net_SSH2 $ssh
+     * @return bool
+     * @access public
+     */
+    function startSSHForwarding($ssh)
+    {
+        if ($this->forward_status == SYSTEM_SSH_AGENT_FORWARD_NONE) {
+            $this->forward_status = SYSTEM_SSH_AGENT_FORWARD_REQUEST;
+        }
+    }
+
+    /**
+     * Request agent forwarding of remote server
+     *
+     * @param Net_SSH2 $ssh
+     * @return bool
+     * @access private
+     */
+    function _request_forwarding($ssh)
+    {
+        $request_channel = $ssh->_get_open_channel();
+        if ($request_channel === false) {
+            return false;
+        }
+
+        $packet = pack(
+            'CNNa*C',
+            NET_SSH2_MSG_CHANNEL_REQUEST,
+            $ssh->server_channels[$request_channel],
+            strlen('auth-agent-req@openssh.com'),
+            'auth-agent-req@openssh.com',
+            1
+        );
+
+        $ssh->channel_status[$request_channel] = NET_SSH2_MSG_CHANNEL_REQUEST;
+
+        if (!$ssh->_send_binary_packet($packet)) {
+            return false;
+        }
+
+        $response = $ssh->_get_channel_packet($request_channel);
+        if ($response === false) {
+            return false;
+        }
+
+        $ssh->channel_status[$request_channel] = NET_SSH2_MSG_CHANNEL_OPEN;
+        $this->forward_status = SYSTEM_SSH_AGENT_FORWARD_ACTIVE;
+
+        return true;
+    }
+
+    /**
+     * On successful channel open
+     *
+     * This method is called upon successful channel
+     * open to give the SSH Agent an opportunity
+     * to take further action. i.e. request agent forwarding
+     *
+     * @param Net_SSH2 $ssh
+     * @access private
+     */
+    function _on_channel_open($ssh)
+    {
+        if ($this->forward_status == SYSTEM_SSH_AGENT_FORWARD_REQUEST) {
+            $this->_request_forwarding($ssh);
+        }
+    }
+
+    /**
+     * Forward data to SSH Agent and return data reply
+     *
+     * @param string $data
+     * @return data from SSH Agent
+     * @access private
+     */
+    function _forward_data($data)
+    {
+        if ($this->expected_bytes > 0) {
+            $this->socket_buffer.= $data;
+            $this->expected_bytes -= strlen($data);
+        } else {
+            $agent_data_bytes = current(unpack('N', $data));
+            $current_data_bytes = strlen($data);
+            $this->socket_buffer = $data;
+            if ($current_data_bytes != $agent_data_bytes + 4) {
+                $this->expected_bytes = ($agent_data_bytes + 4) - $current_data_bytes;
+                return false;
+            }
+        }
+
+        if (strlen($this->socket_buffer) != fwrite($this->fsock, $this->socket_buffer)) {
+            user_error('Connection closed attempting to forward data to SSH agent');
+        }
+
+        $this->socket_buffer = '';
+        $this->expected_bytes = 0;
+
+        $agent_reply_bytes = current(unpack('N', fread($this->fsock, 4)));
+
+        $agent_reply_data = fread($this->fsock, $agent_reply_bytes);
+        $agent_reply_data = current(unpack('a*', $agent_reply_data));
+
+        return pack('Na*', $agent_reply_bytes, $agent_reply_data);
+    }
+}
diff --git a/lib/php/phpseclib/System/SSH_Agent.php b/lib/php/phpseclib/System/SSH_Agent.php
new file mode 100644
index 00000000..2800ea00
--- /dev/null
+++ b/lib/php/phpseclib/System/SSH_Agent.php
@@ -0,0 +1,39 @@
+<?php
+/**
+ * Pure-PHP ssh-agent client wrapper
+ *
+ * PHP versions 4 and 5
+ *
+ * Originally System_SSH_Agent was accessed as System/SSH_Agent.php instead of
+ * System/SSH/Agent.php. The problem with this is that PSR0 compatible autoloaders
+ * don't support that kind of directory layout hence the package being moved and
+ * this "alias" being created to maintain backwards compatibility.
+ *
+ * LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @category  System
+ * @package   System_SSH_Agent
+ * @author    Jim Wigginton <terrafrost@php.net>
+ * @copyright 2014 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ * @internal  See http://api.libssh.org/rfc/PROTOCOL.agent
+ */
+
+require_once 'SSH/Agent.php';
diff --git a/lib/php/phpseclib/bootstrap.php b/lib/php/phpseclib/bootstrap.php
new file mode 100644
index 00000000..95d5d6fb
--- /dev/null
+++ b/lib/php/phpseclib/bootstrap.php
@@ -0,0 +1,16 @@
+<?php
+/**
+ * Bootstrapping File for phpseclib
+ *
+ * @license http://www.opensource.org/licenses/mit-license.html MIT License
+ */
+
+if (extension_loaded('mbstring')) {
+    // 2 - MB_OVERLOAD_STRING
+    if (ini_get('mbstring.func_overload') & 2) {
+        throw new \UnexpectedValueException(
+            'Overloading of string functions using mbstring.func_overload ' .
+            'is not supported by phpseclib.'
+        );
+    }
+}
diff --git a/lib/php/phpseclib/openssl.cnf b/lib/php/phpseclib/openssl.cnf
new file mode 100644
index 00000000..58a1261b
--- /dev/null
+++ b/lib/php/phpseclib/openssl.cnf
@@ -0,0 +1,6 @@
+# minimalist openssl.cnf file for use with phpseclib
+
+HOME			= .
+RANDFILE		= $ENV::HOME/.rnd
+
+[ v3_ca ]
diff --git a/lib/php/phpseclib/test.php b/lib/php/phpseclib/test.php
new file mode 100644
index 00000000..53117877
--- /dev/null
+++ b/lib/php/phpseclib/test.php
@@ -0,0 +1,64 @@
+<?php
+include('Crypt/AES.php');
+include('Crypt/Random.php');
+
+$cipher = new Crypt_AES(); // could use CRYPT_AES_MODE_CBC
+// keys are null-padded to the closest valid size
+// longer than the longest key and it's truncated
+//$cipher->setKeyLength(128);
+$cipher->setKey('abcdefghijklmnop');
+// the IV defaults to all-NULLs if not explicitly defined
+$size = 9;
+$key = substr(bin2hex(crypt_random_string(($size/2)+1)),0,$size);
+#$key = base64_encode(crypt_random_string(8));
+echo "Key: ".$key."\n";
+echo "Key Length: ".strlen($key)."\n";
+exit;
+$cipher->setIV(crypt_random_string($cipher->getBlockLength() >> 3));
+
+$plaintext = 'Hello';
+
+echo $cipher->decrypt($cipher->encrypt($plaintext));
+#echo $cipher->encrypt($plaintext);
+#######
+exit;
+
+include('Crypt/RSA.php');
+
+$rsa = new Crypt_RSA();
+//extract($rsa->createKey());
+
+$plaintext = 'Hello World!';
+$privatekey = '-----BEGIN RSA PRIVATE KEY-----
+MIICXQIBAAKBgQCjfQKsF6ExR/zLUKa2qiIr8jwh9s36z5dXIg+S+iZygO3p8ZNHzJlKj9JhHOnp
+8FxObW93JwKeoyd17J6Dep1t2vm9SJt+jAm3psNpM2a1fZVJSMhKJSj/S9cNL8AwL8CuAyioKs4R
+XFFuq2ASm0gXd1Y6bKHSzeZ49N8onIwueQIDAQABAoGAAvSZ1YQY1yP6wy8qUF+LfhljMmb8isXx
+cbMNLoZEpynDA0lpdPETLVijwDsuVFsSxB0w2GnVX4pKBpT4OZ7AFUqphgv1CpeVGXP+6YISZApb
+D3yliPL4fwWYi/ttC2ceMylKhohm+Ol6kxYeUitoiOuft2FzE70SCOxZOU23QsECQQDX9PIru6hr
+8p4WBq6D829BB4WHnP7K/pj6gCi/iUXNS8cEHml/mJtgOxbSX8aWFDfJFlCmMcp3/zzw35zM/BJh
+AkEAwc18aPgie472UunjlPLKelSlS/D8e2ZPLWbB3xyJcBn7CiCzeavpmQSOeVofrKyJfBb3FQut
+VZL3AOMnIX9DGQJBALfsnfQxNxf44jrQJgGraq1vwoHla/tnKtLuI8Y9G33lc/JGFIPfbTVgHee+
+OlvHjFtu7fEdptrcPwLG77yFUwECQQCq3HIpzVIBYwoSEXh+kgsnDMdqi3zdglad7XFRNcSJ263y
+wN/ajlD1ggnmPSmdv8O6bjjKCjB4OIih9KJEKwHJAkBJAFKDTpAWMXBmSWl95Ibkr+2aU6VUQcVS
+jhQbDsAWLNOkIrZsS33SS5kEc3LSl6oLH/Lh3759YLkOONHqFFN4
+-----END RSA PRIVATE KEY-----';
+
+$publickey = '-----BEGIN PUBLIC KEY-----
+MIGJAoGBAKN9AqwXoTFH/MtQpraqIivyPCH2zfrPl1ciD5L6JnKA7enxk0fMmUqP0mEc6enwXE5t
+b3cnAp6jJ3XsnoN6nW3a+b1Im36MCbemw2kzZrV9lUlIyEolKP9L1w0vwDAvwK4DKKgqzhFcUW6r
+YBKbSBd3VjpsodLN5nj03yicjC55AgMBAAE=
+-----END PUBLIC KEY-----';
+
+$rsa->loadKey($privatekey);
+$encrypt_text = $rsa->encrypt($plaintext);
+
+$rsa->loadKey($publickey);
+$decrypt_text = $rsa->decrypt($encrypt_text);
+
+echo "INPUT: ".$plaintext."\n";
+echo "ENCRYPTED: ".$encrypt_text."\n";
+echo "DECRYPTED: ".$decrypt_text."\n\n";
+echo "PRIVATE KEY: ".$privatekey."\n\n";
+echo "PUBLIC KEY: ".$publickey."\n";
+
+?>
-- 
2.47.3