phpseclib missing files

3 files changed, 4687 insertions, 0 deletions

diff --git a/vendor/phpseclib/phpseclib/phpseclib/Crypt/Base.php b/vendor/phpseclib/phpseclib/phpseclib/Crypt/Base.php
new file mode 100644
index 000000000..efbcd242b
--- /dev/null
+++ b/vendor/phpseclib/phpseclib/phpseclib/Crypt/Base.php
@@ -0,0 +1,2699 @@
+<?php
+
+/**
+ * Base Class for all \phpseclib\Crypt\* cipher classes
+ *
+ * PHP version 5
+ *
+ * Internally for phpseclib developers:
+ *  If you plan to add a new cipher class, please note following rules:
+ *
+ *  - The new \phpseclib\Crypt\* cipher class should extend \phpseclib\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 \phpseclib\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
+ *
+ * @category  Crypt
+ * @package   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
+ */
+
+namespace phpseclib\Crypt;
+
+/**
+ * Base Class for all \phpseclib\Crypt\* cipher classes
+ *
+ * @package Base
+ * @author  Jim Wigginton <terrafrost@php.net>
+ * @author  Hans-Juergen Petrich <petrich@tronic-media.com>
+ */
+abstract class Base
+{
+    /**#@+
+     * @access public
+     * @see \phpseclib\Crypt\Base::encrypt()
+     * @see \phpseclib\Crypt\Base::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
+     */
+    const 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
+     */
+    const 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
+     */
+    const 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
+     */
+    const MODE_CFB = 3;
+    /**
+     * Encrypt / decrypt using the Cipher Feedback mode (8bit)
+     */
+    const MODE_CFB8 = 38;
+    /**
+     * Encrypt / decrypt using the Output Feedback mode.
+     *
+     * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Output_feedback_.28OFB.29
+     */
+    const MODE_OFB = 4;
+    /**
+     * Encrypt / decrypt using streaming mode.
+     */
+    const MODE_STREAM = 5;
+    /**#@-*/
+
+    /**
+     * Whirlpool available flag
+     *
+     * @see \phpseclib\Crypt\Base::_hashInlineCryptFunction()
+     * @var bool
+     * @access private
+     */
+    static $WHIRLPOOL_AVAILABLE;
+
+    /**#@+
+     * @access private
+     * @see \phpseclib\Crypt\Base::__construct()
+     */
+    /**
+     * Base value for the internal implementation $engine switch
+     */
+    const ENGINE_INTERNAL = 1;
+    /**
+     * Base value for the mcrypt implementation $engine switch
+     */
+    const ENGINE_MCRYPT = 2;
+    /**
+     * Base value for the mcrypt implementation $engine switch
+     */
+    const ENGINE_OPENSSL = 3;
+    /**#@-*/
+
+    /**
+     * The Encryption Mode
+     *
+     * @see self::__construct()
+     * @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 \phpseclib\Crypt\Twofish::setKey()
+     * @see \phpseclib\Crypt\Twofish::setIV()
+     * @var bool
+     * @access private
+     */
+    var $enchanged = true;
+
+    /**
+     * Does the demcrypt resource need to be (re)initialized?
+     *
+     * @see \phpseclib\Crypt\Twofish::setKey()
+     * @see \phpseclib\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 == self::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::__construct()
+     * @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:
+     * - self::ENGINE_OPENSSL  (very fast, php-extension: openssl, extension_loaded('openssl') required)
+     * - self::ENGINE_MCRYPT   (fast, php-extension: mcrypt, extension_loaded('mcrypt') required)
+     * - self::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 == self::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 == self::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 name of the performance-optimized callback function
+     *
+     * Used by encrypt() / decrypt()
+     * only if $engine == self::ENGINE_INTERNAL
+     *
+     * @see self::encrypt()
+     * @see self::decrypt()
+     * @see self::_setupInlineCrypt()
+     * @see self::$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 = true;
+
+    /**
+     * 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:
+     *
+     * - self::MODE_ECB
+     *
+     * - self::MODE_CBC
+     *
+     * - self::MODE_CTR
+     *
+     * - self::MODE_CFB
+     *
+     * - self::MODE_OFB
+     *
+     * If not explicitly set, self::MODE_CBC will be used.
+     *
+     * @param int $mode
+     * @access public
+     */
+    function __construct($mode = self::MODE_CBC)
+    {
+        // $mode dependent settings
+        switch ($mode) {
+            case self::MODE_ECB:
+                $this->paddable = true;
+                $this->mode = self::MODE_ECB;
+                break;
+            case self::MODE_CTR:
+            case self::MODE_CFB:
+            case self::MODE_CFB8:
+            case self::MODE_OFB:
+            case self::MODE_STREAM:
+                $this->mode = $mode;
+                break;
+            case self::MODE_CBC:
+            default:
+                $this->paddable = true;
+                $this->mode = self::MODE_CBC;
+        }
+
+        $this->_setEngine();
+    }
+
+    /**
+     * Sets the initialization vector. (optional)
+     *
+     * SetIV is not required when self::MODE_ECB (or ie for AES: \phpseclib\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 == self::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])) {
+                    $dkLen = $func_args[5];
+                } else {
+                    $dkLen = $method == 'pbkdf1' ? 2 * $this->key_length : $this->key_length;
+                }
+
+                switch (true) {
+                    case $method == 'pbkdf1':
+                        $hashObj = new 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()):
+                        $i = 1;
+                        $hmac = new 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 ($this->engine === self::ENGINE_OPENSSL) {
+            if ($this->changed) {
+                $this->_clearBuffers();
+                $this->changed = false;
+            }
+            switch ($this->mode) {
+                case self::MODE_STREAM:
+                    return openssl_encrypt($plaintext, $this->cipher_name_openssl, $this->key, $this->openssl_options);
+                case self::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 self::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 self::MODE_CTR:
+                    return $this->_openssl_ctr_process($plaintext, $this->encryptIV, $this->enbuffer);
+                case self::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 self::MODE_CFB8:
+                    $ciphertext = openssl_encrypt($plaintext, $this->cipher_name_openssl, $this->key, $this->openssl_options, $this->encryptIV);
+                    if ($this->continuousBuffer) {
+                        if (($len = strlen($ciphertext)) >= $this->block_size) {
+                            $this->encryptIV = substr($ciphertext, -$this->block_size);
+                        } else {
+                            $this->encryptIV = substr($this->encryptIV, $len - $this->block_size) . substr($ciphertext, -$len);
+                        }
+                    }
+                    return $ciphertext;
+                case self::MODE_OFB:
+                    return $this->_openssl_ofb_process($plaintext, $this->encryptIV, $this->enbuffer);
+            }
+        }
+
+        if ($this->engine === self::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 == self::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 self::MODE_ECB:
+                for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
+                    $ciphertext.= $this->_encryptBlock(substr($plaintext, $i, $block_size));
+                }
+                break;
+            case self::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 self::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) . $buffer['ciphertext'];
+                    }
+                }
+                break;
+            case self::MODE_CFB:
+                // cfb loosely routines inspired by openssl's:
+                // {@link http://cvs.openssl.org/fileview?f=openssl/crypto/modes/cfb128.c&v=1.3.2.2.2.1}
+                if ($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 self::MODE_CFB8:
+                $ciphertext = '';
+                $len = strlen($plaintext);
+                $iv = $this->encryptIV;
+
+                for ($i = 0; $i < $len; ++$i) {
+                    $ciphertext .= ($c = $plaintext[$i] ^ $this->_encryptBlock($iv));
+                    $iv = substr($iv, 1) . $c;
+                }
+
+                if ($this->continuousBuffer) {
+                    if ($len >= $block_size) {
+                        $this->encryptIV = substr($ciphertext, -$block_size);
+                    } else {
+                        $this->encryptIV = substr($this->encryptIV, $len - $block_size) . substr($ciphertext, -$len);
+                    }
+                }
+                break;
+            case self::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 self::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 === self::ENGINE_OPENSSL) {
+            if ($this->changed) {
+                $this->_clearBuffers();
+                $this->changed = false;
+            }
+            switch ($this->mode) {
+                case self::MODE_STREAM:
+                    $plaintext = openssl_decrypt($ciphertext, $this->cipher_name_openssl, $this->key, $this->openssl_options);
+                    break;
+                case self::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 self::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 self::MODE_CTR:
+                    $plaintext = $this->_openssl_ctr_process($ciphertext, $this->decryptIV, $this->debuffer);
+                    break;
+                case self::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 self::MODE_CFB8:
+                    $plaintext = openssl_decrypt($ciphertext, $this->cipher_name_openssl, $this->key, $this->openssl_options, $this->decryptIV);
+                    if ($this->continuousBuffer) {
+                        if (($len = strlen($ciphertext)) >= $this->block_size) {
+                            $this->decryptIV = substr($ciphertext, -$this->block_size);
+                        } else {
+                            $this->decryptIV = substr($this->decryptIV, $len - $this->block_size) . substr($ciphertext, -$len);
+                        }
+                    }
+                    break;
+                case self::MODE_OFB:
+                    $plaintext = $this->_openssl_ofb_process($ciphertext, $this->decryptIV, $this->debuffer);
+            }
+
+            return $this->paddable ? $this->_unpad($plaintext) : $plaintext;
+        }
+
+        if ($this->engine === self::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 == self::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 self::MODE_ECB:
+                for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
+                    $plaintext.= $this->_decryptBlock(substr($ciphertext, $i, $block_size));
+                }
+                break;
+            case self::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 self::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) . $buffer['ciphertext'];
+                    }
+                }
+                break;
+            case self::MODE_CFB:
+                if ($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 self::MODE_CFB8:
+                $plaintext = '';
+                $len = strlen($ciphertext);
+                $iv = $this->decryptIV;
+
+                for ($i = 0; $i < $len; ++$i) {
+                    $plaintext .= $ciphertext[$i] ^ $this->_encryptBlock($iv);
+                    $iv = substr($iv, 1) . $ciphertext[$i];
+                }
+
+                if ($this->continuousBuffer) {
+                    if ($len >= $block_size) {
+                        $this->decryptIV = substr($ciphertext, -$block_size);
+                    } else {
+                        $this->decryptIV = substr($this->decryptIV, $len - $block_size) . substr($ciphertext, -$len);
+                    }
+                }
+                break;
+            case self::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 self::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 Base::encrypt()
+     * and 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 Base::encrypt()
+     * and 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 self::MODE_ECB:
+                return 'ecb';
+            case self::MODE_CBC:
+                return 'cbc';
+            case self::MODE_CTR:
+                return 'ctr';
+            case self::MODE_CFB:
+                return 'cfb';
+            case self::MODE_CFB8:
+                return 'cfb8';
+            case self::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($plaintext, 16, 16)));
+     * </code>
+     *
+     * With the continuous buffer disabled, these would yield the same output.  With it enabled, they yield different
+     * outputs.  The reason is due to the fact that the initialization vector's change after every encryption /
+     * decryption round when the continuous buffer is enabled.  When it's disabled, they remain constant.
+     *
+     * Put another way, when the continuous buffer is enabled, the state of the \phpseclib\Crypt\*() object changes after each
+     * encryption / decryption round, whereas otherwise, it'd remain constant.  For this reason, it's recommended that
+     * continuous buffers not be used.  They do offer better security and are, in fact, sometimes required (SSH uses them),
+     * however, they are also less intuitive and more likely to cause you problems.
+     *
+     * @see self::disableContinuousBuffer()
+     * @access public
+     * @internal Could, but not must, extend by the child Crypt_* class
+     */
+    function enableContinuousBuffer()
+    {
+        if ($this->mode == self::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 == self::MODE_ECB) {
+            return;
+        }
+        if (!$this->continuousBuffer) {
+            return;
+        }
+
+        $this->continuousBuffer = false;
+        $this->changed = true;
+
+        $this->_setEngine();
+    }
+
+    /**
+     * Test for engine validity
+     *
+     * @see self::__construct()
+     * @param int $engine
+     * @access public
+     * @return bool
+     */
+    function isValidEngine($engine)
+    {
+        switch ($engine) {
+            case self::ENGINE_OPENSSL:
+                if ($this->mode == self::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 self::MODE_CTR:
+                        if (in_array($this->cipher_name_openssl_ecb, $methods)) {
+                            $this->openssl_emulate_ctr = true;
+                            return true;
+                        }
+                }
+                return false;
+            case self::ENGINE_MCRYPT:
+                return $this->cipher_name_mcrypt &&
+                       extension_loaded('mcrypt') &&
+                       in_array($this->cipher_name_mcrypt, @mcrypt_list_algorithms());
+            case self::ENGINE_INTERNAL:
+                return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * Sets the preferred crypt engine
+     *
+     * Currently, $engine could be:
+     *
+     * - \phpseclib\Crypt\Base::ENGINE_OPENSSL  [very fast]
+     *
+     * - \phpseclib\Crypt\Base::ENGINE_MCRYPT   [fast]
+     *
+     * - \phpseclib\Crypt\Base::ENGINE_INTERNAL [slow]
+     *
+     * If the preferred crypt engine is not available the fastest available one will be used
+     *
+     * @see self::__construct()
+     * @param int $engine
+     * @access public
+     */
+    function setPreferredEngine($engine)
+    {
+        switch ($engine) {
+            //case self::ENGINE_OPENSSL;
+            case self::ENGINE_MCRYPT:
+            case self::ENGINE_INTERNAL:
+                $this->preferredEngine = $engine;
+                break;
+            default:
+                $this->preferredEngine = self::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::__construct()
+     * @access private
+     */
+    function _setEngine()
+    {
+        $this->engine = null;
+
+        $candidateEngines = array(
+            $this->preferredEngine,
+            self::ENGINE_OPENSSL,
+            self::ENGINE_MCRYPT
+        );
+        foreach ($candidateEngines as $engine) {
+            if ($this->isValidEngine($engine)) {
+                $this->engine = $engine;
+                break;
+            }
+        }
+        if (!$this->engine) {
+            $this->engine = self::ENGINE_INTERNAL;
+        }
+
+        if ($this->engine != self::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
+     *
+     * Note: Must be extended by the child \phpseclib\Crypt\* class
+     *
+     * @access private
+     * @param string $in
+     * @return string
+     */
+    abstract function _encryptBlock($in);
+
+    /**
+     * Decrypts a block
+     *
+     * Note: Must be extended by the child \phpseclib\Crypt\* class
+     *
+     * @access private
+     * @param string $in
+     * @return string
+     */
+    abstract function _decryptBlock($in);
+
+    /**
+     * Setup the key (expansion)
+     *
+     * Only used if $engine == self::ENGINE_INTERNAL
+     *
+     * Note: Must extend by the child \phpseclib\Crypt\* class
+     *
+     * @see self::_setup()
+     * @access private
+     */
+    abstract function _setupKey();
+
+    /**
+     * Setup the self::ENGINE_INTERNAL $engine
+     *
+     * (re)init, if necessary, the internal cipher $engine and flush all $buffers
+     * Used (only) if $engine == self::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 self::ENGINE_MCRYPT $engine
+     *
+     * (re)init, if necessary, the (ext)mcrypt resources and flush all $buffers
+     * Used (only) if $engine = self::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(
+                self::MODE_CTR    => 'ctr',
+                self::MODE_ECB    => MCRYPT_MODE_ECB,
+                self::MODE_CBC    => MCRYPT_MODE_CBC,
+                self::MODE_CFB    => 'ncfb',
+                self::MODE_CFB8   => MCRYPT_MODE_CFB,
+                self::MODE_OFB    => MCRYPT_MODE_NOFB,
+                self::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 == self::MODE_CFB) {
+                $this->ecb = @mcrypt_module_open($this->cipher_name_mcrypt, '', MCRYPT_MODE_ECB, '');
+            }
+        } // else should mcrypt_generic_deinit be called?
+
+        if ($this->mode == self::MODE_CFB) {
+            @mcrypt_generic_init($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 == self::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 \phpseclib\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 \phpseclib\Crypt\Base() \phpseclib\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 \phpseclib\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 \phpseclib\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 self::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 self::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 self::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 self::MODE_CFB8:
+                $encrypt = $init_encrypt . '
+                    $_ciphertext = "";
+                    $_len = strlen($_text);
+                    $_iv = $self->encryptIV;
+
+                    for ($_i = 0; $_i < $_len; ++$_i) {
+                        $in = $_iv;
+                        '.$encrypt_block.'
+                        $_ciphertext .= ($_c = $_text[$_i] ^ $in);
+                        $_iv = substr($_iv, 1) . $_c;
+                    }
+
+                    if ($self->continuousBuffer) {
+                        if ($_len >= '.$block_size.') {
+                            $self->encryptIV = substr($_ciphertext, -'.$block_size.');
+                        } else {
+                            $self->encryptIV = substr($self->encryptIV, $_len - '.$block_size.') . substr($_ciphertext, -$_len);
+                        }
+                    }
+
+                    return $_ciphertext;
+                    ';
+                $decrypt = $init_encrypt . '
+                    $_plaintext = "";
+                    $_len = strlen($_text);
+                    $_iv = $self->decryptIV;
+
+                    for ($_i = 0; $_i < $_len; ++$_i) {
+                        $in = $_iv;
+                        '.$encrypt_block.'
+                        $_plaintext .= $_text[$_i] ^ $in;
+                        $_iv = substr($_iv, 1) . $_text[$_i];
+                    }
+
+                    if ($self->continuousBuffer) {
+                        if ($_len >= '.$block_size.') {
+                            $self->decryptIV = substr($_text, -'.$block_size.');
+                        } else {
+                            $self->decryptIV = substr($self->decryptIV, $_len - '.$block_size.') . substr($_text, -$_len);
+                        }
+                    }
+
+                    return $_plaintext;
+                    ';
+                break;
+            case self::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 self::MODE_STREAM:
+                $encrypt = $init_encrypt . '
+                    $_ciphertext = "";
+                    '.$encrypt_block.'
+                    return $_ciphertext;
+                    ';
+                $decrypt = $init_decrypt . '
+                    $_plaintext = "";
+                    '.$decrypt_block.'
+                    return $_plaintext;
+                    ';
+                break;
+            // case self::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 $inline function and return its name as string. Ready to run!
+        eval('$func = function ($_action, &$self, $_text) { ' . $init_crypt . 'if ($_action == "encrypt") { ' . $encrypt . ' } else { ' . $decrypt . ' } };');
+        return $func;
+    }
+
+    /**
+     * 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 string $bytes
+     * @return string
+     */
+    function _hashInlineCryptFunction($bytes)
+    {
+        if (!isset(self::$WHIRLPOOL_AVAILABLE)) {
+            self::$WHIRLPOOL_AVAILABLE = extension_loaded('hash') && in_array('whirlpool', hash_algos());
+        }
+
+        $result = '';
+        $hash = $bytes;
+
+        switch (true) {
+            case self::$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 ARM CPUs 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 (php_uname('m') & "\xDF\xDF\xDF") != 'ARM':
+                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()
+    {
+        switch (true) {
+            case defined('PHP_INT_SIZE') && PHP_INT_SIZE == 8:
+            case (php_uname('m') & "\xDF\xDF\xDF") != 'ARM':
+                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/vendor/phpseclib/phpseclib/phpseclib/Net/SCP.php b/vendor/phpseclib/phpseclib/phpseclib/Net/SCP.php
new file mode 100644
index 000000000..cf13496cd
--- /dev/null
+++ b/vendor/phpseclib/phpseclib/phpseclib/Net/SCP.php
@@ -0,0 +1,342 @@
+<?php
+
+/**
+ * Pure-PHP implementation of SCP.
+ *
+ * PHP version 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 'vendor/autoload.php';
+ *
+ *    $ssh = new \phpseclib\Net\SSH2('www.domain.tld');
+ *    if (!$ssh->login('username', 'password')) {
+ *        exit('bad login');
+ *    }
+ *    $scp = new \phpseclib\Net\SCP($ssh);
+ *
+ *    $scp->put('abcd', str_repeat('x', 1024*1024));
+ * ?>
+ * </code>
+ *
+ * @category  Net
+ * @package   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
+ */
+
+namespace phpseclib\Net;
+
+/**
+ * Pure-PHP implementations of SCP.
+ *
+ * @package SCP
+ * @author  Jim Wigginton <terrafrost@php.net>
+ * @access  public
+ */
+class SCP
+{
+    /**#@+
+     * @access public
+     * @see \phpseclib\Net\SCP::put()
+     */
+    /**
+     * Reads data from a local file.
+     */
+    const SOURCE_LOCAL_FILE = 1;
+    /**
+     * Reads data from a string.
+     */
+    const SOURCE_STRING = 2;
+    /**#@-*/
+
+    /**#@+
+     * @access private
+     * @see \phpseclib\Net\SCP::_send()
+     * @see \phpseclib\Net\SCP::_receive()
+    */
+    /**
+     * SSH1 is being used.
+     */
+    const MODE_SSH1 = 1;
+    /**
+     * SSH2 is being used.
+     */
+    const MODE_SSH2 =  2;
+    /**#@-*/
+
+    /**
+     * 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 \phpseclib\Net\SSH1|\phpseclib\Net\SSH2 $ssh
+     * @return \phpseclib\Net\SCP
+     * @access public
+     */
+    function __construct($ssh)
+    {
+        if ($ssh instanceof SSH2) {
+            $this->mode = self::MODE_SSH2;
+        } elseif ($ssh instanceof SSH1) {
+            $this->packet_size = 50000;
+            $this->mode = self::MODE_SSH1;
+        } else {
+            return;
+        }
+
+        $this->ssh = $ssh;
+    }
+
+    /**
+     * Uploads a file to the SCP server.
+     *
+     * By default, \phpseclib\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 \phpseclib\Net\SCP::get(), you will get a file, twelve bytes
+     * long, containing 'filename.ext' as its contents.
+     *
+     * Setting $mode to self::SOURCE_LOCAL_FILE will change the above behavior.  With self::SOURCE_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 = self::SOURCE_STRING, $callback = null)
+    {
+        if (!isset($this->ssh)) {
+            return false;
+        }
+
+        if (empty($remote_file)) {
+            user_error('remote_file cannot be blank', E_USER_NOTICE);
+            return false;
+        }
+
+        if (!$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 == self::MODE_SSH2) {
+            $this->packet_size = $this->ssh->packet_size_client_to_server[SSH2::CHANNEL_EXEC] - 4;
+        }
+
+        $remote_file = basename($remote_file);
+
+        if ($mode == self::SOURCE_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 = $mode & self::SOURCE_STRING ? substr($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 != self::SOURCE_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 self::MODE_SSH2:
+                $this->ssh->_send_channel_packet(SSH2::CHANNEL_EXEC, $data);
+                break;
+            case self::MODE_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 self::MODE_SSH2:
+                return $this->ssh->_get_channel_packet(SSH2::CHANNEL_EXEC, true);
+            case self::MODE_SSH1:
+                if (!$this->ssh->bitmap) {
+                    return false;
+                }
+                while (true) {
+                    $response = $this->ssh->_get_binary_packet();
+                    switch ($response[SSH1::RESPONSE_TYPE]) {
+                        case NET_SSH1_SMSG_STDOUT_DATA:
+                            if (strlen($response[SSH1::RESPONSE_DATA]) < 4) {
+                                return false;
+                            }
+                            extract(unpack('Nlength', $response[SSH1::RESPONSE_DATA]));
+                            return $this->ssh->_string_shift($response[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 self::MODE_SSH2:
+                $this->ssh->_close_channel(SSH2::CHANNEL_EXEC, true);
+                break;
+            case self::MODE_SSH1:
+                $this->ssh->disconnect();
+        }
+    }
+}
diff --git a/vendor/phpseclib/phpseclib/phpseclib/Net/SSH1.php b/vendor/phpseclib/phpseclib/phpseclib/Net/SSH1.php
new file mode 100644
index 000000000..e372b8b92
--- /dev/null
+++ b/vendor/phpseclib/phpseclib/phpseclib/Net/SSH1.php
@@ -0,0 +1,1646 @@
+<?php
+
+/**
+ * Pure-PHP implementation of SSHv1.
+ *
+ * PHP version 5
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ *    include 'vendor/autoload.php';
+ *
+ *    $ssh = new \phpseclib\Net\SSH1('www.domain.tld');
+ *    if (!$ssh->login('username', 'password')) {
+ *        exit('Login Failed');
+ *    }
+ *
+ *    echo $ssh->exec('ls -la');
+ * ?>
+ * </code>
+ *
+ * Here's another short example:
+ * <code>
+ * <?php
+ *    include 'vendor/autoload.php';
+ *
+ *    $ssh = new \phpseclib\Net\SSH1('www.domain.tld');
+ *    if (!$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}.
+ *
+ * @category  Net
+ * @package   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
+ */
+
+namespace phpseclib\Net;
+
+use phpseclib\Crypt\DES;
+use phpseclib\Crypt\Random;
+use phpseclib\Crypt\TripleDES;
+use phpseclib\Math\BigInteger;
+
+/**
+ * Pure-PHP implementation of SSHv1.
+ *
+ * @package SSH1
+ * @author  Jim Wigginton <terrafrost@php.net>
+ * @access  public
+ */
+class SSH1
+{
+    /**#@+
+     * Encryption Methods
+     *
+     * @see \phpseclib\Net\SSH1::getSupportedCiphers()
+     * @access public
+     */
+    /**
+     * No encryption
+     *
+     * Not supported.
+     */
+    const CIPHER_NONE = 0;
+    /**
+     * IDEA in CFB mode
+     *
+     * Not supported.
+     */
+    const CIPHER_IDEA = 1;
+    /**
+     * DES in CBC mode
+     */
+    const CIPHER_DES = 2;
+    /**
+     * Triple-DES in CBC mode
+     *
+     * All implementations are required to support this
+     */
+    const 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)
+     */
+    const 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).
+     */
+    const 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)
+     */
+    const CIPHER_BLOWFISH = 6;
+    /**#@-*/
+
+    /**#@+
+     * Authentication Methods
+     *
+     * @see \phpseclib\Net\SSH1::getSupportedAuthentications()
+     * @access public
+    */
+    /**
+     * .rhosts or /etc/hosts.equiv
+     */
+    const AUTH_RHOSTS = 1;
+    /**
+     * pure RSA authentication
+     */
+    const AUTH_RSA = 2;
+    /**
+     * password authentication
+     *
+     * This is the only method that is supported by this library.
+     */
+    const AUTH_PASSWORD = 3;
+    /**
+     * .rhosts with RSA host authentication
+     */
+    const AUTH_RHOSTS_RSA = 4;
+    /**#@-*/
+
+    /**#@+
+     * Terminal Modes
+     *
+     * @link http://3sp.com/content/developer/maverick-net/docs/Maverick.SSH.PseudoTerminalModesMembers.html
+     * @access private
+    */
+    const TTY_OP_END = 0;
+    /**#@-*/
+
+    /**
+     * The Response Type
+     *
+     * @see \phpseclib\Net\SSH1::_get_binary_packet()
+     * @access private
+     */
+    const RESPONSE_TYPE = 1;
+
+    /**
+     * The Response Data
+     *
+     * @see \phpseclib\Net\SSH1::_get_binary_packet()
+     * @access private
+     */
+    const RESPONSE_DATA = 2;
+
+    /**#@+
+     * Execution Bitmap Masks
+     *
+     * @see \phpseclib\Net\SSH1::bitmap
+     * @access private
+    */
+    const MASK_CONSTRUCTOR = 0x00000001;
+    const MASK_CONNECTED   = 0x00000002;
+    const MASK_LOGIN       = 0x00000004;
+    const MASK_SHELL       = 0x00000008;
+    /**#@-*/
+
+    /**#@+
+     * @access public
+     * @see \phpseclib\Net\SSH1::getLog()
+    */
+    /**
+     * Returns the message numbers
+     */
+    const LOG_SIMPLE = 1;
+    /**
+     * Returns the message content
+     */
+    const LOG_COMPLEX = 2;
+    /**
+     * Outputs the content real-time
+     */
+    const LOG_REALTIME = 3;
+    /**
+     * Dumps the content real-time to a file
+     */
+    const LOG_REALTIME_FILE = 4;
+    /**#@-*/
+
+    /**#@+
+     * @access public
+     * @see \phpseclib\Net\SSH1::read()
+    */
+    /**
+     * Returns when a string matching $expect exactly is found
+     */
+    const READ_SIMPLE = 1;
+    /**
+     * Returns when a string matching the regular expression $expect is found
+     */
+    const READ_REGEX = 2;
+    /**#@-*/
+
+    /**
+     * 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(
+        self::CIPHER_NONE       => 'No encryption',
+        self::CIPHER_IDEA       => 'IDEA in CFB mode',
+        self::CIPHER_DES        => 'DES in CBC mode',
+        self::CIPHER_3DES       => 'Triple-DES in CBC mode',
+        self::CIPHER_BROKEN_TSS => 'TRI\'s Simple Stream encryption CBC',
+        self::CIPHER_RC4        => 'RC4',
+        self::CIPHER_BLOWFISH   => 'Blowfish'
+    );
+
+    /**
+     * Supported Authentications
+     *
+     * Logged for debug purposes
+     *
+     * @see self::getSupportedAuthentications()
+     * @var array
+     * @access private
+     */
+    var $supported_authentications = array(
+        self::AUTH_RHOSTS     => '.rhosts or /etc/hosts.equiv',
+        self::AUTH_RSA        => 'pure RSA authentication',
+        self::AUTH_PASSWORD   => 'password authentication',
+        self::AUTH_RHOSTS_RSA => '.rhosts with RSA host authentication'
+    );
+
+    /**
+     * Server Identification
+     *
+     * @see self::getServerIdentification()
+     * @var string
+     * @access private
+     */
+    var $server_identification = '';
+
+    /**
+     * Protocol Flags
+     *
+     * @see self::__construct()
+     * @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::__construct()
+     * @see self::_connect()
+     * @var string
+     * @access private
+     */
+    var $host;
+
+    /**
+     * Port Number
+     *
+     * @see self::__construct()
+     * @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::__construct()
+     * @see self::_connect()
+     * @var int
+     * @access private
+     */
+    var $connectionTimeout;
+
+    /**
+     * Default cipher
+     *
+     * @see self::__construct()
+     * @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 $cipher
+     * @return \phpseclib\Net\SSH1
+     * @access public
+     */
+    function __construct($host, $port = 22, $timeout = 10, $cipher = self::CIPHER_3DES)
+    {
+        $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;
+    }
+
+    /**
+     * 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[self::RESPONSE_TYPE] != NET_SSH1_SMSG_PUBLIC_KEY) {
+            user_error('Expected SSH_SMSG_PUBLIC_KEY');
+            return false;
+        }
+
+        $anti_spoofing_cookie = $this->_string_shift($response[self::RESPONSE_DATA], 8);
+
+        $this->_string_shift($response[self::RESPONSE_DATA], 4);
+
+        if (strlen($response[self::RESPONSE_DATA]) < 2) {
+            return false;
+        }
+        $temp = unpack('nlen', $this->_string_shift($response[self::RESPONSE_DATA], 2));
+        $server_key_public_exponent = new BigInteger($this->_string_shift($response[self::RESPONSE_DATA], ceil($temp['len'] / 8)), 256);
+        $this->server_key_public_exponent = $server_key_public_exponent;
+
+        if (strlen($response[self::RESPONSE_DATA]) < 2) {
+            return false;
+        }
+        $temp = unpack('nlen', $this->_string_shift($response[self::RESPONSE_DATA], 2));
+        $server_key_public_modulus = new BigInteger($this->_string_shift($response[self::RESPONSE_DATA], ceil($temp['len'] / 8)), 256);
+
+        $this->server_key_public_modulus = $server_key_public_modulus;
+
+        $this->_string_shift($response[self::RESPONSE_DATA], 4);
+
+        if (strlen($response[self::RESPONSE_DATA]) < 2) {
+            return false;
+        }
+        $temp = unpack('nlen', $this->_string_shift($response[self::RESPONSE_DATA], 2));
+        $host_key_public_exponent = new BigInteger($this->_string_shift($response[self::RESPONSE_DATA], ceil($temp['len'] / 8)), 256);
+        $this->host_key_public_exponent = $host_key_public_exponent;
+
+        if (strlen($response[self::RESPONSE_DATA]) < 2) {
+            return false;
+        }
+        $temp = unpack('nlen', $this->_string_shift($response[self::RESPONSE_DATA], 2));
+        $host_key_public_modulus = new BigInteger($this->_string_shift($response[self::RESPONSE_DATA], ceil($temp['len'] / 8)), 256);
+
+        $this->host_key_public_modulus = $host_key_public_modulus;
+
+        $this->_string_shift($response[self::RESPONSE_DATA], 4);
+
+        // get a list of the supported ciphers
+        if (strlen($response[self::RESPONSE_DATA]) < 4) {
+            return false;
+        }
+        extract(unpack('Nsupported_ciphers_mask', $this->_string_shift($response[self::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[self::RESPONSE_DATA]) < 4) {
+            return false;
+        }
+        extract(unpack('Nsupported_authentications_mask', $this->_string_shift($response[self::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 = 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 : self::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 self::CIPHER_NONE:
+            //    $this->crypto = new \phpseclib\Crypt\Null();
+            //    break;
+            case self::CIPHER_DES:
+                $this->crypto = new DES();
+                $this->crypto->disablePadding();
+                $this->crypto->enableContinuousBuffer();
+                $this->crypto->setKey(substr($session_key, 0,  8));
+                break;
+            case self::CIPHER_3DES:
+                $this->crypto = new TripleDES(TripleDES::MODE_3CBC);
+                $this->crypto->disablePadding();
+                $this->crypto->enableContinuousBuffer();
+                $this->crypto->setKey(substr($session_key, 0, 24));
+                break;
+            //case self::CIPHER_RC4:
+            //    $this->crypto = new RC4();
+            //    $this->crypto->enableContinuousBuffer();
+            //    $this->crypto->setKey(substr($session_key, 0,  16));
+            //    break;
+        }
+
+        $response = $this->_get_binary_packet();
+
+        if ($response[self::RESPONSE_TYPE] != NET_SSH1_SMSG_SUCCESS) {
+            user_error('Expected SSH_SMSG_SUCCESS');
+            return false;
+        }
+
+        $this->bitmap = self::MASK_CONNECTED;
+
+        return true;
+    }
+
+    /**
+     * Login
+     *
+     * @param string $username
+     * @param string $password
+     * @return bool
+     * @access public
+     */
+    function login($username, $password = '')
+    {
+        if (!($this->bitmap & self::MASK_CONSTRUCTOR)) {
+            $this->bitmap |= self::MASK_CONSTRUCTOR;
+            if (!$this->_connect()) {
+                return false;
+            }
+        }
+
+        if (!($this->bitmap & self::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[self::RESPONSE_TYPE] == NET_SSH1_SMSG_SUCCESS) {
+            $this->bitmap |= self::MASK_LOGIN;
+            return true;
+        } elseif ($response[self::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 == self::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[self::RESPONSE_TYPE] == NET_SSH1_SMSG_SUCCESS) {
+            $this->bitmap |= self::MASK_LOGIN;
+            return true;
+        } elseif ($response[self::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 \phpseclib\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
+     * @param bool $block
+     * @return mixed
+     * @access public
+     */
+    function exec($cmd, $block = true)
+    {
+        if (!($this->bitmap & self::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[self::RESPONSE_DATA], 4);
+                $response = $this->_get_binary_packet();
+            } while (is_array($response) && $response[self::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 \phpseclib\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.
+        $data = pack('CNa*N4C', NET_SSH1_CMSG_REQUEST_PTY, strlen('vt100'), 'vt100', 24, 80, 0, 0, self::TTY_OP_END);
+
+        if (!$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[self::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;
+        }
+
+        $this->bitmap |= self::MASK_SHELL;
+
+        //stream_set_blocking($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 == self::READ_REGEX,
+     * a regular expression.
+     *
+     * @see self::write()
+     * @param string $expect
+     * @param int $mode
+     * @return bool
+     * @access public
+     */
+    function read($expect, $mode = self::READ_SIMPLE)
+    {
+        if (!($this->bitmap & self::MASK_LOGIN)) {
+            user_error('Operation disallowed prior to login()');
+            return false;
+        }
+
+        if (!($this->bitmap & self::MASK_SHELL) && !$this->_initShell()) {
+            user_error('Unable to initiate an interactive shell session');
+            return false;
+        }
+
+        $match = $expect;
+        while (true) {
+            if ($mode == self::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[self::RESPONSE_DATA], 4);
+        }
+    }
+
+    /**
+     * Inputs a command into an interactive shell.
+     *
+     * @see self::interactiveRead()
+     * @param string $cmd
+     * @return bool
+     * @access public
+     */
+    function interactiveWrite($cmd)
+    {
+        if (!($this->bitmap & self::MASK_LOGIN)) {
+            user_error('Operation disallowed prior to login()');
+            return false;
+        }
+
+        if (!($this->bitmap & self::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 & self::MASK_LOGIN)) {
+            user_error('Operation disallowed prior to login()');
+            return false;
+        }
+
+        if (!($this->bitmap & self::MASK_SHELL) && !$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[self::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) {
+                $response = array(self::RESPONSE_TYPE => -1);
+            }
+            switch ($response[self::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, $length);
+            if (strlen($temp) != $length) {
+                return false;
+            }
+            $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(
+            self::RESPONSE_TYPE => $type,
+            self::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;
+
+        $padding = Random::string(8 - ($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::__construct()
+     * @param BigInteger $m
+     * @param array $key
+     * @return BigInteger
+     * @access private
+     */
+    function _rsa_crypt($m, $key)
+    {
+        /*
+        $rsa = new RSA();
+        $rsa->loadKey($key, RSA::PUBLIC_FORMAT_RAW);
+        $rsa->setEncryptionMode(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) {
+            $block = Random::string($length - strlen($random));
+            $block = str_replace("\x00", '', $block);
+            $random.= $block;
+        }
+        $temp = chr(0) . chr(2) . $random . chr(0) . $m;
+
+        $m = new BigInteger($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.
+     *
+     * @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 == self::LOG_COMPLEX, an array if NET_SSH1_LOGGING == self::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 self::LOG_SIMPLE:
+                return $this->message_number_log;
+                break;
+            case self::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(self::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(self::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 int $protocol_flags
+     * @param string $message
+     * @access private
+     */
+    function _append_log($protocol_flags, $message)
+    {
+        switch (NET_SSH1_LOGGING) {
+            // useful for benchmarks
+            case self::LOG_SIMPLE:
+                $this->protocol_flags_log[] = $protocol_flags;
+                break;
+            // the most useful log for SSH1
+            case self::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 > self::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 self::LOG_REALTIME:
+                echo "<pre>\r\n" . $this->_format_log(array($message), array($protocol_flags)) . "\r\n</pre>\r\n";
+                @flush();
+                @ob_flush();
+                break;
+            // basically the same thing as self::LOG_REALTIME with the caveat that self::LOG_REALTIME_FILE
+            // needs to be defined and that the resultant log file will be capped out at self::LOG_MAX_SIZE.
+            // the earliest part of the log file is denoted by the first <<< START >>> and is not going to necessarily
+            // at the beginning of the file
+            case self::LOG_REALTIME_FILE:
+                if (!isset($this->realtime_log_file)) {
+                    // PHP doesn't seem to like using constants in fopen()
+                    $filename = self::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 ($this->realtime_log_size > self::LOG_MAX_SIZE) {
+                    fseek($this->realtime_log_file, 0);
+                    $this->realtime_log_size = strlen($entry);
+                    $this->realtime_log_wrap = true;
+                }
+                fputs($this->realtime_log_file, $entry);
+        }
+    }
+}