Added: incubator/vcl/trunk/web/.ht-inc/phpseclib/Crypt/Hash.php
URL: 
http://svn.apache.org/viewvc/incubator/vcl/trunk/web/.ht-inc/phpseclib/Crypt/Hash.php?rev=1136647&view=auto
==============================================================================
--- incubator/vcl/trunk/web/.ht-inc/phpseclib/Crypt/Hash.php (added)
+++ incubator/vcl/trunk/web/.ht-inc/phpseclib/Crypt/Hash.php Thu Jun 16 
20:18:36 2011
@@ -0,0 +1,824 @@
+<?php
+/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
+
+/**
+ * Pure-PHP implementations of keyed-hash message authentication codes (HMACs) 
and various cryptographic hashing functions.
+ *
+ * Uses hash() or mhash() if available and an internal implementation, 
otherwise.  Currently supports the following:
+ *
+ * md2, md5, md5-96, sha1, sha1-96, sha256, sha384, and sha512
+ *
+ * If {@link Crypt_Hash::setKey() setKey()} is called, {@link 
Crypt_Hash::hash() hash()} will return the HMAC as opposed to
+ * the hash.  If no valid algorithm is provided, sha1 will be used.
+ *
+ * PHP versions 4 and 5
+ *
+ * {@internal The variable names are the same as those in 
+ * {@link http://tools.ietf.org/html/rfc2104#section-2 RFC2104}.}}
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ *    include('Crypt/Hash.php');
+ *
+ *    $hash = new Crypt_Hash('sha1');
+ *
+ *    $hash->setKey('abcdefg');
+ *
+ *    echo base64_encode($hash->hash('abcdefg'));
+ * ?>
+ * </code>
+ *
+ * LICENSE: Permission is hereby granted, free of charge, to any person 
obtaining a copy
+ * of this software and associated documentation files (the "Software"), to 
deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @category   Crypt
+ * @package    Crypt_Hash
+ * @author     Jim Wigginton <terrafr...@php.net>
+ * @copyright  MMVII Jim Wigginton
+ * @license    http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @version    $Id: Hash.php,v 1.6 2009/11/23 23:37:07 terrafrost Exp $
+ * @link       http://phpseclib.sourceforge.net
+ */
+
+/**#@+
+ * @access private
+ * @see Crypt_Hash::Crypt_Hash()
+ */
+/**
+ * Toggles the internal implementation
+ */
+define('CRYPT_HASH_MODE_INTERNAL', 1);
+/**
+ * Toggles the mhash() implementation, which has been deprecated on PHP 5.3.0+.
+ */
+define('CRYPT_HASH_MODE_MHASH',    2);
+/**
+ * Toggles the hash() implementation, which works on PHP 5.1.2+.
+ */
+define('CRYPT_HASH_MODE_HASH',     3);
+/**#@-*/
+
+/**
+ * Pure-PHP implementations of keyed-hash message authentication codes (HMACs) 
and various cryptographic hashing functions.
+ *
+ * @author  Jim Wigginton <terrafr...@php.net>
+ * @version 0.1.0
+ * @access  public
+ * @package Crypt_Hash
+ */
+class Crypt_Hash {
+    /**
+     * Byte-length of compression blocks / key (Internal HMAC)
+     *
+     * @see Crypt_Hash::setAlgorithm()
+     * @var Integer
+     * @access private
+     */
+    var $b;
+
+    /**
+     * Byte-length of hash output (Internal HMAC)
+     *
+     * @see Crypt_Hash::setHash()
+     * @var Integer
+     * @access private
+     */
+    var $l = false;
+
+    /**
+     * Hash Algorithm
+     *
+     * @see Crypt_Hash::setHash()
+     * @var String
+     * @access private
+     */
+    var $hash;
+
+    /**
+     * Key
+     *
+     * @see Crypt_Hash::setKey()
+     * @var String
+     * @access private
+     */
+    var $key = '';
+
+    /**
+     * Outer XOR (Internal HMAC)
+     *
+     * @see Crypt_Hash::setKey()
+     * @var String
+     * @access private
+     */
+    var $opad;
+
+    /**
+     * Inner XOR (Internal HMAC)
+     *
+     * @see Crypt_Hash::setKey()
+     * @var String
+     * @access private
+     */
+    var $ipad;
+
+    /**
+     * Default Constructor.
+     *
+     * @param optional String $hash
+     * @return Crypt_Hash
+     * @access public
+     */
+    function Crypt_Hash($hash = 'sha1')
+    {
+        if ( !defined('CRYPT_HASH_MODE') ) {
+            switch (true) {
+                case extension_loaded('hash'):
+                    define('CRYPT_HASH_MODE', CRYPT_HASH_MODE_HASH);
+                    break;
+                case extension_loaded('mhash'):
+                    define('CRYPT_HASH_MODE', CRYPT_HASH_MODE_MHASH);
+                    break;
+                default:
+                    define('CRYPT_HASH_MODE', CRYPT_HASH_MODE_INTERNAL);
+            }
+        }
+
+        $this->setHash($hash);
+    }
+
+    /**
+     * Sets the key for HMACs
+     *
+     * Keys can be of any length.
+     *
+     * @access public
+     * @param String $key
+     */
+    function setKey($key)
+    {
+        $this->key = $key;
+    }
+
+    /**
+     * Sets the hash function.
+     *
+     * @access public
+     * @param String $hash
+     */
+    function setHash($hash)
+    {
+        switch ($hash) {
+            case 'md5-96':
+            case 'sha1-96':
+                $this->l = 12; // 96 / 8 = 12
+                break;
+            case 'md2':
+            case 'md5':
+                $this->l = 16;
+                break;
+            case 'sha1':
+                $this->l = 20;
+                break;
+            case 'sha256':
+                $this->l = 32;
+                break;
+            case 'sha384':
+                $this->l = 48;
+                break;
+            case 'sha512':
+                $this->l = 64;
+        }
+
+        switch ($hash) {
+            case 'md2':
+                $mode = CRYPT_HASH_MODE == CRYPT_HASH_MODE_HASH && 
in_array('md2', hash_algos()) ?
+                    CRYPT_HASH_MODE_HASH : CRYPT_HASH_MODE_INTERNAL;
+                break;
+            case 'sha384':
+            case 'sha512':
+                $mode = CRYPT_HASH_MODE == CRYPT_HASH_MODE_MHASH ? 
CRYPT_HASH_MODE_INTERNAL : CRYPT_HASH_MODE;
+                break;
+            default:
+                $mode = CRYPT_HASH_MODE;
+        }
+
+        switch ( $mode ) {
+            case CRYPT_HASH_MODE_MHASH:
+                switch ($hash) {
+                    case 'md5':
+                    case 'md5-96':
+                        $this->hash = MHASH_MD5;
+                        break;
+                    case 'sha256':
+                        $this->hash = MHASH_SHA256;
+                        break;
+                    case 'sha1':
+                    case 'sha1-96':
+                    default:
+                        $this->hash = MHASH_SHA1;
+                }
+                return;
+            case CRYPT_HASH_MODE_HASH:
+                switch ($hash) {
+                    case 'md5':
+                    case 'md5-96':
+                        $this->hash = 'md5';
+                        return;
+                    case 'md2':
+                    case 'sha256':
+                    case 'sha384':
+                    case 'sha512':
+                        $this->hash = $hash;
+                        return;
+                    case 'sha1':
+                    case 'sha1-96':
+                    default:
+                        $this->hash = 'sha1';
+                }
+                return;
+        }
+
+        switch ($hash) {
+            case 'md2':
+                 $this->b = 16;
+                 $this->hash = array($this, '_md2');
+                 break;
+            case 'md5':
+            case 'md5-96':
+                 $this->b = 64;
+                 $this->hash = array($this, '_md5');
+                 break;
+            case 'sha256':
+                 $this->b = 64;
+                 $this->hash = array($this, '_sha256');
+                 break;
+            case 'sha384':
+            case 'sha512':
+                 $this->b = 128;
+                 $this->hash = array($this, '_sha512');
+                 break;
+            case 'sha1':
+            case 'sha1-96':
+            default:
+                 $this->b = 64;
+                 $this->hash = array($this, '_sha1');
+        }
+
+        $this->ipad = str_repeat(chr(0x36), $this->b);
+        $this->opad = str_repeat(chr(0x5C), $this->b);
+    }
+
+    /**
+     * Compute the HMAC.
+     *
+     * @access public
+     * @param String $text
+     * @return String
+     */
+    function hash($text)
+    {
+        $mode = is_array($this->hash) ? CRYPT_HASH_MODE_INTERNAL : 
CRYPT_HASH_MODE;
+
+        if (!empty($this->key)) {
+            switch ( $mode ) {
+                case CRYPT_HASH_MODE_MHASH:
+                    $output = mhash($this->hash, $text, $this->key);
+                    break;
+                case CRYPT_HASH_MODE_HASH:
+                    $output = hash_hmac($this->hash, $text, $this->key, true);
+                    break;
+                case CRYPT_HASH_MODE_INTERNAL:
+                    /* "Applications that use keys longer than B bytes will 
first hash the key using H and then use the
+                        resultant L byte string as the actual key to HMAC."
+
+                        -- http://tools.ietf.org/html/rfc2104#section-2 */
+                    $key = strlen($this->key) > $this->b ? 
call_user_func($this->hash, $this->key) : $this->key;
+
+                    $key    = str_pad($key, $this->b, chr(0));      // step 1
+                    $temp   = $this->ipad ^ $key;                   // step 2
+                    $temp  .= $text;                                // step 3
+                    $temp   = call_user_func($this->hash, $temp);   // step 4
+                    $output = $this->opad ^ $key;                   // step 5
+                    $output.= $temp;                                // step 6
+                    $output = call_user_func($this->hash, $output); // step 7
+            }
+        } else {
+            switch ( $mode ) {
+                case CRYPT_HASH_MODE_MHASH:
+                    $output = mhash($this->hash, $text);
+                    break;
+                case CRYPT_HASH_MODE_HASH:
+                    $output = hash($this->hash, $text, true);
+                    break;
+                case CRYPT_HASH_MODE_INTERNAL:
+                    $output = call_user_func($this->hash, $text);
+            }
+        }
+
+        return substr($output, 0, $this->l);
+    }
+
+    /**
+     * Returns the hash length (in bytes)
+     *
+     * @access public
+     * @return Integer
+     */
+    function getLength()
+    {
+        return $this->l;
+    }
+
+    /**
+     * Wrapper for MD5
+     *
+     * @access private
+     * @param String $text
+     */
+    function _md5($m)
+    {
+        return pack('H*', md5($m));
+    }
+
+    /**
+     * Wrapper for SHA1
+     *
+     * @access private
+     * @param String $text
+     */
+    function _sha1($m)
+    {
+        return pack('H*', sha1($m));
+    }
+
+    /**
+     * Pure-PHP implementation of MD2
+     *
+     * See {@link http://tools.ietf.org/html/rfc1319 RFC1319}.
+     *
+     * @access private
+     * @param String $text
+     */
+    function _md2($m)
+    {
+        static $s = array(
+             41,  46,  67, 201, 162, 216, 124,   1,  61,  54,  84, 161, 236, 
240, 6,
+             19,  98, 167,   5, 243, 192, 199, 115, 140, 152, 147,  43, 217, 
188,
+             76, 130, 202,  30, 155,  87,  60, 253, 212, 224,  22, 103,  66, 
111, 24,
+            138,  23, 229,  18, 190,  78, 196, 214, 218, 158, 222,  73, 160, 
251,
+            245, 142, 187,  47, 238, 122, 169, 104, 121, 145,  21, 178,   7,  
63,
+            148, 194,  16, 137,  11,  34,  95,  33, 128, 127,  93, 154,  90, 
144, 50,
+             39,  53,  62, 204, 231, 191, 247, 151,   3, 255,  25,  48, 179,  
72, 165,
+            181, 209, 215,  94, 146,  42, 172,  86, 170, 198,  79, 184,  56, 
210,
+            150, 164, 125, 182, 118, 252, 107, 226, 156, 116,   4, 241,  69, 
157,
+            112,  89, 100, 113, 135,  32, 134,  91, 207, 101, 230,  45, 168,   
2, 27,
+             96,  37, 173, 174, 176, 185, 246,  28,  70,  97, 105,  52,  64, 
126, 15,
+             85,  71, 163,  35, 221,  81, 175,  58, 195,  92, 249, 206, 186, 
197,
+            234,  38,  44,  83,  13, 110, 133,  40, 132,   9, 211, 223, 205, 
244, 65,
+            129,  77,  82, 106, 220,  55, 200, 108, 193, 171, 250,  36, 225, 
123,
+              8,  12, 189, 177,  74, 120, 136, 149, 139, 227,  99, 232, 109, 
233,
+            203, 213, 254,  59,   0,  29,  57, 242, 239, 183,  14, 102,  88, 
208, 228,
+            166, 119, 114, 248, 235, 117,  75,  10,  49,  68,  80, 180, 143, 
237,
+             31,  26, 219, 153, 141,  51, 159,  17, 131, 20
+        );
+
+        // Step 1. Append Padding Bytes
+        $pad = 16 - (strlen($m) & 0xF);
+        $m.= str_repeat(chr($pad), $pad);
+
+        $length = strlen($m);
+
+        // Step 2. Append Checksum
+        $c = str_repeat(chr(0), 16);
+        $l = chr(0);
+        for ($i = 0; $i < $length; $i+= 16) {
+            for ($j = 0; $j < 16; $j++) {
+                // RFC1319 incorrectly states that C[j] should be set to S[c 
xor L]
+                //$c[$j] = chr($s[ord($m[$i + $j] ^ $l)]);
+                // per <http://www.rfc-editor.org/errata_search.php?rfc=1319>, 
however, C[j] should be set to S[c xor L] xor C[j]
+                $c[$j] = chr($s[ord($m[$i + $j] ^ $l)] ^ ord($c[$j]));
+                $l = $c[$j];
+            }
+        }
+        $m.= $c;
+
+        $length+= 16;
+
+        // Step 3. Initialize MD Buffer
+        $x = str_repeat(chr(0), 48);
+
+        // Step 4. Process Message in 16-Byte Blocks
+        for ($i = 0; $i < $length; $i+= 16) {
+            for ($j = 0; $j < 16; $j++) {
+                $x[$j + 16] = $m[$i + $j];
+                $x[$j + 32] = $x[$j + 16] ^ $x[$j];
+            }
+            $t = chr(0);
+            for ($j = 0; $j < 18; $j++) {
+                for ($k = 0; $k < 48; $k++) {
+                    $x[$k] = $t = $x[$k] ^ chr($s[ord($t)]);
+                    //$t = $x[$k] = $x[$k] ^ chr($s[ord($t)]);
+                }
+                $t = chr(ord($t) + $j);
+            }
+        }
+
+        // Step 5. Output
+        return substr($x, 0, 16);
+    }
+
+    /**
+     * Pure-PHP implementation of SHA256
+     *
+     * See {@link 
http://en.wikipedia.org/wiki/SHA_hash_functions#SHA-256_.28a_SHA-2_variant.29_pseudocode
 SHA-256 (a SHA-2 variant) pseudocode - Wikipedia}.
+     *
+     * @access private
+     * @param String $text
+     */
+    function _sha256($m)
+    {
+        if (extension_loaded('suhosin')) {
+            return pack('H*', sha256($m));
+        }
+
+        // Initialize variables
+        $hash = array(
+            0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 
0x9b05688c, 0x1f83d9ab, 0x5be0cd19
+        );
+        // Initialize table of round constants
+        // (first 32 bits of the fractional parts of the cube roots of the 
first 64 primes 2..311)
+        static $k = array(
+            0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 
0x59f111f1, 0x923f82a4, 0xab1c5ed5,
+            0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 
0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
+            0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 
0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
+            0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 
0xd5a79147, 0x06ca6351, 0x14292967,
+            0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 
0x766a0abb, 0x81c2c92e, 0x92722c85,
+            0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 
0xd6990624, 0xf40e3585, 0x106aa070,
+            0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 
0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
+            0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 
0xa4506ceb, 0xbef9a3f7, 0xc67178f2
+        );
+
+        // Pre-processing
+        $length = strlen($m);
+        // to round to nearest 56 mod 64, we'll add 64 - (length + (64 - 56)) 
% 64
+        $m.= str_repeat(chr(0), 64 - (($length + 8) & 0x3F));
+        $m[$length] = chr(0x80);
+        // we don't support hashing strings 512MB long
+        $m.= pack('N2', 0, $length << 3);
+
+        // Process the message in successive 512-bit chunks
+        $chunks = str_split($m, 64);
+        foreach ($chunks as $chunk) {
+            $w = array();
+            for ($i = 0; $i < 16; $i++) {
+                extract(unpack('Ntemp', $this->_string_shift($chunk, 4)));
+                $w[] = $temp;
+            }
+
+            // Extend the sixteen 32-bit words into sixty-four 32-bit words
+            for ($i = 16; $i < 64; $i++) {
+                $s0 = $this->_rightRotate($w[$i - 15],  7) ^
+                      $this->_rightRotate($w[$i - 15], 18) ^
+                      $this->_rightShift( $w[$i - 15],  3);
+                $s1 = $this->_rightRotate($w[$i - 2], 17) ^
+                      $this->_rightRotate($w[$i - 2], 19) ^
+                      $this->_rightShift( $w[$i - 2], 10);
+                $w[$i] = $this->_add($w[$i - 16], $s0, $w[$i - 7], $s1);
+
+            }
+
+            // Initialize hash value for this chunk
+            list($a, $b, $c, $d, $e, $f, $g, $h) = $hash;
+
+            // Main loop
+            for ($i = 0; $i < 64; $i++) {
+                $s0 = $this->_rightRotate($a,  2) ^
+                      $this->_rightRotate($a, 13) ^
+                      $this->_rightRotate($a, 22);
+                $maj = ($a & $b) ^
+                       ($a & $c) ^
+                       ($b & $c);
+                $t2 = $this->_add($s0, $maj);
+
+                $s1 = $this->_rightRotate($e,  6) ^
+                      $this->_rightRotate($e, 11) ^
+                      $this->_rightRotate($e, 25);
+                $ch = ($e & $f) ^
+                      ($this->_not($e) & $g);
+                $t1 = $this->_add($h, $s1, $ch, $k[$i], $w[$i]);
+
+                $h = $g;
+                $g = $f;
+                $f = $e;
+                $e = $this->_add($d, $t1);
+                $d = $c;
+                $c = $b;
+                $b = $a;
+                $a = $this->_add($t1, $t2);
+            }
+
+            // Add this chunk's hash to result so far
+            $hash = array(
+                $this->_add($hash[0], $a),
+                $this->_add($hash[1], $b),
+                $this->_add($hash[2], $c),
+                $this->_add($hash[3], $d),
+                $this->_add($hash[4], $e),
+                $this->_add($hash[5], $f),
+                $this->_add($hash[6], $g),
+                $this->_add($hash[7], $h)
+            );
+        }
+
+        // Produce the final hash value (big-endian)
+        return pack('N8', $hash[0], $hash[1], $hash[2], $hash[3], $hash[4], 
$hash[5], $hash[6], $hash[7]);
+    }
+
+    /**
+     * Pure-PHP implementation of SHA384 and SHA512
+     *
+     * @access private
+     * @param String $text
+     */
+    function _sha512($m)
+    {
+        if (!class_exists('Math_BigInteger')) {
+            require_once('Math/BigInteger.php');
+        }
+
+        static $init384, $init512, $k;
+
+        if (!isset($k)) {
+            // Initialize variables
+            $init384 = array( // initial values for SHA384
+                'cbbb9d5dc1059ed8', '629a292a367cd507', '9159015a3070dd17', 
'152fecd8f70e5939', 
+                '67332667ffc00b31', '8eb44a8768581511', 'db0c2e0d64f98fa7', 
'47b5481dbefa4fa4'
+            );
+            $init512 = array( // initial values for SHA512
+                '6a09e667f3bcc908', 'bb67ae8584caa73b', '3c6ef372fe94f82b', 
'a54ff53a5f1d36f1', 
+                '510e527fade682d1', '9b05688c2b3e6c1f', '1f83d9abfb41bd6b', 
'5be0cd19137e2179'
+            );
+
+            for ($i = 0; $i < 8; $i++) {
+                $init384[$i] = new Math_BigInteger($init384[$i], 16);
+                $init384[$i]->setPrecision(64);
+                $init512[$i] = new Math_BigInteger($init512[$i], 16);
+                $init512[$i]->setPrecision(64);
+            }
+
+            // Initialize table of round constants
+            // (first 64 bits of the fractional parts of the cube roots of the 
first 80 primes 2..409)
+            $k = array(
+                '428a2f98d728ae22', '7137449123ef65cd', 'b5c0fbcfec4d3b2f', 
'e9b5dba58189dbbc',
+                '3956c25bf348b538', '59f111f1b605d019', '923f82a4af194f9b', 
'ab1c5ed5da6d8118',
+                'd807aa98a3030242', '12835b0145706fbe', '243185be4ee4b28c', 
'550c7dc3d5ffb4e2',
+                '72be5d74f27b896f', '80deb1fe3b1696b1', '9bdc06a725c71235', 
'c19bf174cf692694',
+                'e49b69c19ef14ad2', 'efbe4786384f25e3', '0fc19dc68b8cd5b5', 
'240ca1cc77ac9c65',
+                '2de92c6f592b0275', '4a7484aa6ea6e483', '5cb0a9dcbd41fbd4', 
'76f988da831153b5',
+                '983e5152ee66dfab', 'a831c66d2db43210', 'b00327c898fb213f', 
'bf597fc7beef0ee4',
+                'c6e00bf33da88fc2', 'd5a79147930aa725', '06ca6351e003826f', 
'142929670a0e6e70',
+                '27b70a8546d22ffc', '2e1b21385c26c926', '4d2c6dfc5ac42aed', 
'53380d139d95b3df',
+                '650a73548baf63de', '766a0abb3c77b2a8', '81c2c92e47edaee6', 
'92722c851482353b',
+                'a2bfe8a14cf10364', 'a81a664bbc423001', 'c24b8b70d0f89791', 
'c76c51a30654be30',
+                'd192e819d6ef5218', 'd69906245565a910', 'f40e35855771202a', 
'106aa07032bbd1b8',
+                '19a4c116b8d2d0c8', '1e376c085141ab53', '2748774cdf8eeb99', 
'34b0bcb5e19b48a8',
+                '391c0cb3c5c95a63', '4ed8aa4ae3418acb', '5b9cca4f7763e373', 
'682e6ff3d6b2b8a3',
+                '748f82ee5defb2fc', '78a5636f43172f60', '84c87814a1f0ab72', 
'8cc702081a6439ec',
+                '90befffa23631e28', 'a4506cebde82bde9', 'bef9a3f7b2c67915', 
'c67178f2e372532b',
+                'ca273eceea26619c', 'd186b8c721c0c207', 'eada7dd6cde0eb1e', 
'f57d4f7fee6ed178',
+                '06f067aa72176fba', '0a637dc5a2c898a6', '113f9804bef90dae', 
'1b710b35131c471b',
+                '28db77f523047d84', '32caab7b40c72493', '3c9ebe0a15c9bebc', 
'431d67c49c100d4c',
+                '4cc5d4becb3e42b6', '597f299cfc657e2a', '5fcb6fab3ad6faec', 
'6c44198c4a475817'
+            );
+
+            for ($i = 0; $i < 80; $i++) {
+                $k[$i] = new Math_BigInteger($k[$i], 16);
+            }
+        }
+
+        $hash = $this->l == 48 ? $init384 : $init512;
+
+        // Pre-processing
+        $length = strlen($m);
+        // to round to nearest 112 mod 128, we'll add 128 - (length + (128 - 
112)) % 128
+        $m.= str_repeat(chr(0), 128 - (($length + 16) & 0x7F));
+        $m[$length] = chr(0x80);
+        // we don't support hashing strings 512MB long
+        $m.= pack('N4', 0, 0, 0, $length << 3);
+
+        // Process the message in successive 1024-bit chunks
+        $chunks = str_split($m, 128);
+        foreach ($chunks as $chunk) {
+            $w = array();
+            for ($i = 0; $i < 16; $i++) {
+                $temp = new Math_BigInteger($this->_string_shift($chunk, 8), 
256);
+                $temp->setPrecision(64);
+                $w[] = $temp;
+            }
+
+            // Extend the sixteen 32-bit words into eighty 32-bit words
+            for ($i = 16; $i < 80; $i++) {
+                $temp = array(
+                          $w[$i - 15]->bitwise_rightRotate(1),
+                          $w[$i - 15]->bitwise_rightRotate(8),
+                          $w[$i - 15]->bitwise_rightShift(7)
+                );
+                $s0 = $temp[0]->bitwise_xor($temp[1]);
+                $s0 = $s0->bitwise_xor($temp[2]);
+                $temp = array(
+                          $w[$i - 2]->bitwise_rightRotate(19),
+                          $w[$i - 2]->bitwise_rightRotate(61),
+                          $w[$i - 2]->bitwise_rightShift(6)
+                );
+                $s1 = $temp[0]->bitwise_xor($temp[1]);
+                $s1 = $s1->bitwise_xor($temp[2]);
+                $w[$i] = $w[$i - 16]->copy();
+                $w[$i] = $w[$i]->add($s0);
+                $w[$i] = $w[$i]->add($w[$i - 7]);
+                $w[$i] = $w[$i]->add($s1);
+            }
+
+            // Initialize hash value for this chunk
+            $a = $hash[0]->copy();
+            $b = $hash[1]->copy();
+            $c = $hash[2]->copy();
+            $d = $hash[3]->copy();
+            $e = $hash[4]->copy();
+            $f = $hash[5]->copy();
+            $g = $hash[6]->copy();
+            $h = $hash[7]->copy();
+
+            // Main loop
+            for ($i = 0; $i < 80; $i++) {
+                $temp = array(
+                    $a->bitwise_rightRotate(28),
+                    $a->bitwise_rightRotate(34),
+                    $a->bitwise_rightRotate(39)
+                );
+                $s0 = $temp[0]->bitwise_xor($temp[1]);
+                $s0 = $s0->bitwise_xor($temp[2]);
+                $temp = array(
+                    $a->bitwise_and($b),
+                    $a->bitwise_and($c),
+                    $b->bitwise_and($c)
+                );
+                $maj = $temp[0]->bitwise_xor($temp[1]);
+                $maj = $maj->bitwise_xor($temp[2]);
+                $t2 = $s0->add($maj);
+
+                $temp = array(
+                    $e->bitwise_rightRotate(14),
+                    $e->bitwise_rightRotate(18),
+                    $e->bitwise_rightRotate(41)
+                );
+                $s1 = $temp[0]->bitwise_xor($temp[1]);
+                $s1 = $s1->bitwise_xor($temp[2]);
+                $temp = array(
+                    $e->bitwise_and($f),
+                    $g->bitwise_and($e->bitwise_not())
+                );
+                $ch = $temp[0]->bitwise_xor($temp[1]);
+                $t1 = $h->add($s1);
+                $t1 = $t1->add($ch);
+                $t1 = $t1->add($k[$i]);
+                $t1 = $t1->add($w[$i]);
+
+                $h = $g->copy();
+                $g = $f->copy();
+                $f = $e->copy();
+                $e = $d->add($t1);
+                $d = $c->copy();
+                $c = $b->copy();
+                $b = $a->copy();
+                $a = $t1->add($t2);
+            }
+
+            // Add this chunk's hash to result so far
+            $hash = array(
+                $hash[0]->add($a),
+                $hash[1]->add($b),
+                $hash[2]->add($c),
+                $hash[3]->add($d),
+                $hash[4]->add($e),
+                $hash[5]->add($f),
+                $hash[6]->add($g),
+                $hash[7]->add($h)
+            );
+        }
+
+        // Produce the final hash value (big-endian)
+        // (Crypt_Hash::hash() trims the output for hashes but not for HMACs.  
as such, we trim the output here)
+        $temp = $hash[0]->toBytes() . $hash[1]->toBytes() . 
$hash[2]->toBytes() . $hash[3]->toBytes() .
+                $hash[4]->toBytes() . $hash[5]->toBytes();
+        if ($this->l != 48) {
+            $temp.= $hash[6]->toBytes() . $hash[7]->toBytes();
+        }
+
+        return $temp;
+    }
+
+    /**
+     * Right Rotate
+     *
+     * @access private
+     * @param Integer $int
+     * @param Integer $amt
+     * @see _sha256()
+     * @return Integer
+     */
+    function _rightRotate($int, $amt)
+    {
+        $invamt = 32 - $amt;
+        $mask = (1 << $invamt) - 1;
+        return (($int << $invamt) & 0xFFFFFFFF) | (($int >> $amt) & $mask);
+    }
+
+    /**
+     * Right Shift
+     *
+     * @access private
+     * @param Integer $int
+     * @param Integer $amt
+     * @see _sha256()
+     * @return Integer
+     */
+    function _rightShift($int, $amt)
+    {
+        $mask = (1 << (32 - $amt)) - 1;
+        return ($int >> $amt) & $mask;
+    }
+
+    /**
+     * Not
+     *
+     * @access private
+     * @param Integer $int
+     * @see _sha256()
+     * @return Integer
+     */
+    function _not($int)
+    {
+        return ~$int & 0xFFFFFFFF;
+    }
+
+    /**
+     * Add
+     *
+     * _sha256() adds multiple unsigned 32-bit integers.  Since PHP doesn't 
support unsigned integers and since the
+     * possibility of overflow exists, care has to be taken.  
Math_BigInteger() could be used but this should be faster.
+     *
+     * @param String $string
+     * @param optional Integer $index
+     * @return String
+     * @see _sha256()
+     * @access private
+     */
+    function _add()
+    {
+        static $mod;
+        if (!isset($mod)) {
+            $mod = pow(2, 32);
+        }
+
+        $result = 0;
+        $arguments = func_get_args();
+        foreach ($arguments as $argument) {
+            $result+= $argument < 0 ? ($argument & 0x7FFFFFFF) + 0x80000000 : 
$argument;
+        }
+
+        return fmod($result, $mod);
+    }
+
+    /**
+     * String Shift
+     *
+     * Inspired by array_shift
+     *
+     * @param String $string
+     * @param optional Integer $index
+     * @return String
+     * @access private
+     */
+    function _string_shift(&$string, $index = 1)
+    {
+        $substr = substr($string, 0, $index);
+        $string = substr($string, $index);
+        return $substr;
+    }
+}
\ No newline at end of file

Added: incubator/vcl/trunk/web/.ht-inc/phpseclib/Crypt/RC4.php
URL: 
http://svn.apache.org/viewvc/incubator/vcl/trunk/web/.ht-inc/phpseclib/Crypt/RC4.php?rev=1136647&view=auto
==============================================================================
--- incubator/vcl/trunk/web/.ht-inc/phpseclib/Crypt/RC4.php (added)
+++ incubator/vcl/trunk/web/.ht-inc/phpseclib/Crypt/RC4.php Thu Jun 16 20:18:36 
2011
@@ -0,0 +1,505 @@
+<?php
+/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
+
+/**
+ * Pure-PHP implementation of RC4.
+ *
+ * Uses mcrypt, if available, and an internal implementation, otherwise.
+ *
+ * PHP versions 4 and 5
+ *
+ * Useful resources are as follows:
+ *
+ *  - {@link 
http://www.mozilla.org/projects/security/pki/nss/draft-kaukonen-cipher-arcfour-03.txt
 ARCFOUR Algorithm}
+ *  - {@link http://en.wikipedia.org/wiki/RC4 - Wikipedia: RC4}
+ *
+ * RC4 is also known as ARCFOUR or ARC4.  The reason is elaborated upon at 
Wikipedia.  This class is named RC4 and not
+ * ARCFOUR or ARC4 because RC4 is how it is refered to in the SSH1 
specification.
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ *    include('Crypt/RC4.php');
+ *
+ *    $rc4 = new Crypt_RC4();
+ *
+ *    $rc4->setKey('abcdefgh');
+ *
+ *    $size = 10 * 1024;
+ *    $plaintext = '';
+ *    for ($i = 0; $i < $size; $i++) {
+ *        $plaintext.= 'a';
+ *    }
+ *
+ *    echo $rc4->decrypt($rc4->encrypt($plaintext));
+ * ?>
+ * </code>
+ *
+ * LICENSE: Permission is hereby granted, free of charge, to any person 
obtaining a copy
+ * of this software and associated documentation files (the "Software"), to 
deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @category   Crypt
+ * @package    Crypt_RC4
+ * @author     Jim Wigginton <terrafr...@php.net>
+ * @copyright  MMVII Jim Wigginton
+ * @license    http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @version    $Id: RC4.php,v 1.8 2009/06/09 04:00:38 terrafrost Exp $
+ * @link       http://phpseclib.sourceforge.net
+ */
+
+/**#@+
+ * @access private
+ * @see Crypt_RC4::Crypt_RC4()
+ */
+/**
+ * Toggles the internal implementation
+ */
+define('CRYPT_RC4_MODE_INTERNAL', 1);
+/**
+ * Toggles the mcrypt implementation
+ */
+define('CRYPT_RC4_MODE_MCRYPT', 2);
+/**#@-*/
+
+/**#@+
+ * @access private
+ * @see Crypt_RC4::_crypt()
+ */
+define('CRYPT_RC4_ENCRYPT', 0);
+define('CRYPT_RC4_DECRYPT', 1);
+/**#@-*/
+
+/**
+ * Pure-PHP implementation of RC4.
+ *
+ * @author  Jim Wigginton <terrafr...@php.net>
+ * @version 0.1.0
+ * @access  public
+ * @package Crypt_RC4
+ */
+class Crypt_RC4 {
+    /**
+     * The Key
+     *
+     * @see Crypt_RC4::setKey()
+     * @var String
+     * @access private
+     */
+    var $key = "\0";
+
+    /**
+     * The Key Stream for encryption
+     *
+     * If CRYPT_RC4_MODE == CRYPT_RC4_MODE_MCRYPT, this will be equal to the 
mcrypt object
+     *
+     * @see Crypt_RC4::setKey()
+     * @var Array
+     * @access private
+     */
+    var $encryptStream = false;
+
+    /**
+     * The Key Stream for decryption
+     *
+     * If CRYPT_RC4_MODE == CRYPT_RC4_MODE_MCRYPT, this will be equal to the 
mcrypt object
+     *
+     * @see Crypt_RC4::setKey()
+     * @var Array
+     * @access private
+     */
+    var $decryptStream = false;
+
+    /**
+     * The $i and $j indexes for encryption
+     *
+     * @see Crypt_RC4::_crypt()
+     * @var Integer
+     * @access private
+     */
+    var $encryptIndex = 0;
+
+    /**
+     * The $i and $j indexes for decryption
+     *
+     * @see Crypt_RC4::_crypt()
+     * @var Integer
+     * @access private
+     */
+    var $decryptIndex = 0;
+
+    /**
+     * MCrypt parameters
+     *
+     * @see Crypt_RC4::setMCrypt()
+     * @var Array
+     * @access private
+     */
+    var $mcrypt = array('', '');
+
+    /**
+     * The Encryption Algorithm
+     *
+     * Only used if CRYPT_RC4_MODE == CRYPT_RC4_MODE_MCRYPT.  Only possible 
values are MCRYPT_RC4 or MCRYPT_ARCFOUR.
+     *
+     * @see Crypt_RC4::Crypt_RC4()
+     * @var Integer
+     * @access private
+     */
+    var $mode;
+
+    /**
+     * Continuous Buffer status
+     *
+     * @see Crypt_RC4::enableContinuousBuffer()
+     * @var Boolean
+     * @access private
+     */
+    var $continuousBuffer = false;
+
+    /**
+     * Default Constructor.
+     *
+     * Determines whether or not the mcrypt extension should be used.
+     *
+     * @param optional Integer $mode
+     * @return Crypt_RC4
+     * @access public
+     */
+    function Crypt_RC4()
+    {
+        if ( !defined('CRYPT_RC4_MODE') ) {
+            switch (true) {
+                case extension_loaded('mcrypt') && (defined('MCRYPT_ARCFOUR') 
|| defined('MCRYPT_RC4')):
+                    // i'd check to see if rc4 was supported, by doing 
in_array('arcfour', mcrypt_list_algorithms('')),
+                    // but since that can be changed after the object has been 
created, there doesn't seem to be
+                    // a lot of point...
+                    define('CRYPT_RC4_MODE', CRYPT_RC4_MODE_MCRYPT);
+                    break;
+                default:
+                    define('CRYPT_RC4_MODE', CRYPT_RC4_MODE_INTERNAL);
+            }
+        }
+
+        switch ( CRYPT_RC4_MODE ) {
+            case CRYPT_RC4_MODE_MCRYPT:
+                switch (true) {
+                    case defined('MCRYPT_ARCFOUR'):
+                        $this->mode = MCRYPT_ARCFOUR;
+                        break;
+                    case defined('MCRYPT_RC4');
+                        $this->mode = MCRYPT_RC4;
+                }
+        }
+    }
+
+    /**
+     * Sets the key.
+     *
+     * Keys can be between 1 and 256 bytes long.  If they are longer then 256 
bytes, the first 256 bytes will
+     * be used.  If no key is explicitly set, it'll be assumed to be a single 
null byte.
+     *
+     * @access public
+     * @param String $key
+     */
+    function setKey($key)
+    {
+        $this->key = $key;
+
+        if ( CRYPT_RC4_MODE == CRYPT_RC4_MODE_MCRYPT ) {
+            return;
+        }
+
+        $keyLength = strlen($key);
+        $keyStream = array();
+        for ($i = 0; $i < 256; $i++) {
+            $keyStream[$i] = $i;
+        }
+        $j = 0;
+        for ($i = 0; $i < 256; $i++) {
+            $j = ($j + $keyStream[$i] + ord($key[$i % $keyLength])) & 255;
+            $temp = $keyStream[$i];
+            $keyStream[$i] = $keyStream[$j];
+            $keyStream[$j] = $temp;
+        }
+
+        $this->encryptIndex = $this->decryptIndex = array(0, 0);
+        $this->encryptStream = $this->decryptStream = $keyStream;
+    }
+
+    /**
+     * Dummy function.
+     *
+     * Some protocols, such as WEP, prepend an "initialization vector" to the 
key, effectively creating a new key [1].
+     * If you need to use an initialization vector in this manner, feel free 
to prepend it to the key, yourself, before
+     * calling setKey().
+     *
+     * [1] WEP's initialization vectors (IV's) are used in a somewhat insecure 
way.  Since, in that protocol,
+     * the IV's are relatively easy to predict, an attack described by
+     * {@link http://www.drizzle.com/~aboba/IEEE/rc4_ksaproc.pdf Scott 
Fluhrer, Itsik Mantin, and Adi Shamir}
+     * can be used to quickly guess at the rest of the key.  The following 
links elaborate:
+     *
+     * {@link http://www.rsa.com/rsalabs/node.asp?id=2009 
http://www.rsa.com/rsalabs/node.asp?id=2009}
+     * {@link http://en.wikipedia.org/wiki/Related_key_attack 
http://en.wikipedia.org/wiki/Related_key_attack}
+     *
+     * @param String $iv
+     * @see Crypt_RC4::setKey()
+     * @access public
+     */
+    function setIV($iv)
+    {
+    }
+
+    /**
+     * Sets MCrypt parameters. (optional)
+     *
+     * If MCrypt is being used, empty strings will be used, unless otherwise 
specified.
+     *
+     * @link 
http://php.net/function.mcrypt-module-open#function.mcrypt-module-open
+     * @access public
+     * @param optional Integer $algorithm_directory
+     * @param optional Integer $mode_directory
+     */
+    function setMCrypt($algorithm_directory = '', $mode_directory = '')
+    {
+        if ( CRYPT_RC4_MODE == CRYPT_RC4_MODE_MCRYPT ) {
+            $this->mcrypt = array($algorithm_directory, $mode_directory);
+            $this->_closeMCrypt();
+        }
+    }
+
+    /**
+     * Encrypts a message.
+     *
+     * @see Crypt_RC4::_crypt()
+     * @access public
+     * @param String $plaintext
+     */
+    function encrypt($plaintext)
+    {
+        return $this->_crypt($plaintext, CRYPT_RC4_ENCRYPT);
+    }
+
+    /**
+     * Decrypts a message.
+     *
+     * $this->decrypt($this->encrypt($plaintext)) == 
$this->encrypt($this->encrypt($plaintext)).
+     * Atleast if the continuous buffer is disabled.
+     *
+     * @see Crypt_RC4::_crypt()
+     * @access public
+     * @param String $ciphertext
+     */
+    function decrypt($ciphertext)
+    {
+        return $this->_crypt($ciphertext, CRYPT_RC4_DECRYPT);
+    }
+
+    /**
+     * Encrypts or decrypts a message.
+     *
+     * @see Crypt_RC4::encrypt()
+     * @see Crypt_RC4::decrypt()
+     * @access private
+     * @param String $text
+     * @param Integer $mode
+     */
+    function _crypt($text, $mode)
+    {
+        if ( CRYPT_RC4_MODE == CRYPT_RC4_MODE_MCRYPT ) {
+            $keyStream = $mode == CRYPT_RC4_ENCRYPT ? 'encryptStream' : 
'decryptStream';
+
+            if ($this->$keyStream === false) {
+                $this->$keyStream = mcrypt_module_open($this->mode, 
$this->mcrypt[0], MCRYPT_MODE_STREAM, $this->mcrypt[1]);
+                mcrypt_generic_init($this->$keyStream, $this->key, '');
+            } else if (!$this->continuousBuffer) {
+                mcrypt_generic_init($this->$keyStream, $this->key, '');
+            }
+            $newText = mcrypt_generic($this->$keyStream, $text);
+            if (!$this->continuousBuffer) {
+                mcrypt_generic_deinit($this->$keyStream);
+            }
+
+            return $newText;
+        }
+
+        if ($this->encryptStream === false) {
+            $this->setKey($this->key);
+        }
+
+        switch ($mode) {
+            case CRYPT_RC4_ENCRYPT:
+                $keyStream = $this->encryptStream;
+                list($i, $j) = $this->encryptIndex;
+                break;
+            case CRYPT_RC4_DECRYPT:
+                $keyStream = $this->decryptStream;
+                list($i, $j) = $this->decryptIndex;
+        }
+
+        $newText = '';
+        for ($k = 0; $k < strlen($text); $k++) {
+            $i = ($i + 1) & 255;
+            $j = ($j + $keyStream[$i]) & 255;
+            $temp = $keyStream[$i];
+            $keyStream[$i] = $keyStream[$j];
+            $keyStream[$j] = $temp;
+            $temp = $keyStream[($keyStream[$i] + $keyStream[$j]) & 255];
+            $newText.= chr(ord($text[$k]) ^ $temp);
+        }
+
+        if ($this->continuousBuffer) {
+            switch ($mode) {
+                case CRYPT_RC4_ENCRYPT:
+                    $this->encryptStream = $keyStream;
+                    $this->encryptIndex = array($i, $j);
+                    break;
+                case CRYPT_RC4_DECRYPT:
+                    $this->decryptStream = $keyStream;
+                    $this->decryptIndex = array($i, $j);
+            }
+        }
+
+        return $newText;
+    }
+
+    /**
+     * Treat consecutive "packets" as if they are a continuous buffer.
+     *
+     * Say you have a 16-byte plaintext $plaintext.  Using the default 
behavior, the two following code snippets
+     * will yield different outputs:
+     *
+     * <code>
+     *    echo $rc4->encrypt(substr($plaintext, 0, 8));
+     *    echo $rc4->encrypt(substr($plaintext, 8, 8));
+     * </code>
+     * <code>
+     *    echo $rc4->encrypt($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>
+     *    $rc4->encrypt(substr($plaintext, 0, 8));
+     *    echo $rc4->decrypt($des->encrypt(substr($plaintext, 8, 8)));
+     * </code>
+     * <code>
+     *    echo $rc4->decrypt($des->encrypt(substr($plaintext, 8, 8)));
+     * </code>
+     *
+     * With the continuous buffer disabled, these would yield the same output. 
 With it enabled, they yield different
+     * outputs.  The reason is due to the fact that the initialization 
vector's change after every encryption /
+     * decryption round when the continuous buffer is enabled.  When it's 
disabled, they remain constant.
+     *
+     * Put another way, when the continuous buffer is enabled, the state of 
the Crypt_DES() object changes after each
+     * encryption / decryption round, whereas otherwise, it'd remain constant. 
 For this reason, it's recommended that
+     * continuous buffers not be used.  They do offer better security and are, 
in fact, sometimes required (SSH uses them),
+     * however, they are also less intuitive and more likely to cause you 
problems.
+     *
+     * @see Crypt_RC4::disableContinuousBuffer()
+     * @access public
+     */
+    function enableContinuousBuffer()
+    {
+        $this->continuousBuffer = true;
+    }
+
+    /**
+     * Treat consecutive packets as if they are a discontinuous buffer.
+     *
+     * The default behavior.
+     *
+     * @see Crypt_RC4::enableContinuousBuffer()
+     * @access public
+     */
+    function disableContinuousBuffer()
+    {
+        if ( CRYPT_RC4_MODE == CRYPT_RC4_MODE_INTERNAL ) {
+            $this->encryptIndex = $this->decryptIndex = array(0, 0);
+            $this->setKey($this->key);
+        }
+
+        $this->continuousBuffer = false;
+    }
+
+    /**
+     * Dummy function.
+     *
+     * Since RC4 is a stream cipher and not a block cipher, no padding is 
necessary.  The only reason this function is
+     * included is so that you can switch between a block cipher and a stream 
cipher transparently.
+     *
+     * @see Crypt_RC4::disablePadding()
+     * @access public
+     */
+    function enablePadding()
+    {
+    }
+
+    /**
+     * Dummy function.
+     *
+     * @see Crypt_RC4::enablePadding()
+     * @access public
+     */
+    function disablePadding()
+    {
+    }
+
+    /**
+     * Class destructor.
+     *
+     * Will be called, automatically, if you're using PHP5.  If you're using 
PHP4, call it yourself.  Only really
+     * needs to be called if mcrypt is being used.
+     *
+     * @access public
+     */
+    function __destruct()
+    {
+        if ( CRYPT_RC4_MODE == CRYPT_RC4_MODE_MCRYPT ) {
+            $this->_closeMCrypt();
+        }
+    }
+
+    /**
+     * Properly close the MCrypt objects.
+     *
+     * @access prviate
+     */
+    function _closeMCrypt()
+    {
+        if ( $this->encryptStream !== false ) {
+            if ( $this->continuousBuffer ) {
+                mcrypt_generic_deinit($this->encryptStream);
+            }
+
+            mcrypt_module_close($this->encryptStream);
+
+            $this->encryptStream = false;
+        }
+
+        if ( $this->decryptStream !== false ) {
+            if ( $this->continuousBuffer ) {
+                mcrypt_generic_deinit($this->decryptStream);
+            }
+
+            mcrypt_module_close($this->decryptStream);
+
+            $this->decryptStream = false;
+        }
+    }
+}
\ No newline at end of file


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