Added: incubator/vcl/trunk/web/.ht-inc/phpseclib/Crypt/Rijndael.php
URL: 
http://svn.apache.org/viewvc/incubator/vcl/trunk/web/.ht-inc/phpseclib/Crypt/Rijndael.php?rev=1136647&view=auto
==============================================================================
--- incubator/vcl/trunk/web/.ht-inc/phpseclib/Crypt/Rijndael.php (added)
+++ incubator/vcl/trunk/web/.ht-inc/phpseclib/Crypt/Rijndael.php Thu Jun 16 
20:18:36 2011
@@ -0,0 +1,1424 @@
+<?php
+/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
+
+/**
+ * Pure-PHP implementation of Rijndael.
+ *
+ * Does not use mcrypt, even when available, for reasons that are explained 
below.
+ *
+ * PHP versions 4 and 5
+ *
+ * If {@link Crypt_Rijndael::setBlockLength() setBlockLength()} isn't called, 
it'll be assumed to be 128 bits.  If 
+ * {@link Crypt_Rijndael::setKeyLength() setKeyLength()} isn't called, it'll 
be calculated from 
+ * {@link Crypt_Rijndael::setKey() setKey()}.  ie. if the key is 128-bits, the 
key length will be 128-bits.  If it's 
+ * 136-bits it'll be null-padded to 160-bits and 160 bits will be the key 
length until 
+ * {@link Crypt_Rijndael::setKey() setKey()} is called, again, at which point, 
it'll be recalculated.
+ *
+ * Not all Rijndael implementations may support 160-bits or 224-bits as the 
block length / key length.  mcrypt, for example,
+ * does not.  AES, itself, only supports block lengths of 128 and key lengths 
of 128, 192, and 256.
+ * {@link 
http://csrc.nist.gov/archive/aes/rijndael/Rijndael-ammended.pdf#page=10 
Rijndael-ammended.pdf#page=10} defines the
+ * algorithm for block lengths of 192 and 256 but not for block lengths / key 
lengths of 160 and 224.  Indeed, 160 and 224
+ * are first defined as valid key / block lengths in 
+ * {@link 
http://csrc.nist.gov/archive/aes/rijndael/Rijndael-ammended.pdf#page=44 
Rijndael-ammended.pdf#page=44}: 
+ * Extensions: Other block and Cipher Key lengths.
+ *
+ * {@internal The variable names are the same as those in 
+ * {@link 
http://www.csrc.nist.gov/publications/fips/fips197/fips-197.pdf#page=10 
fips-197.pdf#page=10}.}}
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ *    include('Crypt/Rijndael.php');
+ *
+ *    $rijndael = new Crypt_Rijndael();
+ *
+ *    $rijndael->setKey('abcdefghijklmnop');
+ *
+ *    $size = 10 * 1024;
+ *    $plaintext = '';
+ *    for ($i = 0; $i < $size; $i++) {
+ *        $plaintext.= 'a';
+ *    }
+ *
+ *    echo $rijndael->decrypt($rijndael->encrypt($plaintext));
+ * ?>
+ * </code>
+ *
+ * LICENSE: Permission is hereby granted, free of charge, to any person 
obtaining a copy
+ * of this software and associated documentation files (the "Software"), to 
deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @category   Crypt
+ * @package    Crypt_Rijndael
+ * @author     Jim Wigginton <terrafr...@php.net>
+ * @copyright  MMVIII Jim Wigginton
+ * @license    http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @version    $Id: Rijndael.php,v 1.12 2010/02/09 06:10:26 terrafrost Exp $
+ * @link       http://phpseclib.sourceforge.net
+ */
+
+/**#@+
+ * @access public
+ * @see Crypt_Rijndael::encrypt()
+ * @see Crypt_Rijndael::decrypt()
+ */
+/**
+ * Encrypt / decrypt using the Counter mode.
+ *
+ * Set to -1 since that's what Crypt/Random.php uses to index the CTR mode.
+ *
+ * @link 
http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Counter_.28CTR.29
+ */
+define('CRYPT_RIJNDAEL_MODE_CTR', -1);
+/**
+ * Encrypt / decrypt using the Electronic Code Book mode.
+ *
+ * @link 
http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Electronic_codebook_.28ECB.29
+ */
+define('CRYPT_RIJNDAEL_MODE_ECB', 1);
+/**
+ * Encrypt / decrypt using the Code Book Chaining mode.
+ *
+ * @link 
http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher-block_chaining_.28CBC.29
+ */
+define('CRYPT_RIJNDAEL_MODE_CBC', 2);
+/**
+ * Encrypt / decrypt using the Cipher Feedback mode.
+ *
+ * @link 
http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher_feedback_.28CFB.29
+ */
+define('CRYPT_RIJNDAEL_MODE_CFB', 3);
+/**
+ * Encrypt / decrypt using the Cipher Feedback mode.
+ *
+ * @link 
http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Output_feedback_.28OFB.29
+ */
+define('CRYPT_RIJNDAEL_MODE_OFB', 4);
+/**#@-*/
+
+/**#@+
+ * @access private
+ * @see Crypt_Rijndael::Crypt_Rijndael()
+ */
+/**
+ * Toggles the internal implementation
+ */
+define('CRYPT_RIJNDAEL_MODE_INTERNAL', 1);
+/**
+ * Toggles the mcrypt implementation
+ */
+define('CRYPT_RIJNDAEL_MODE_MCRYPT', 2);
+/**#@-*/
+
+/**
+ * Pure-PHP implementation of Rijndael.
+ *
+ * @author  Jim Wigginton <terrafr...@php.net>
+ * @version 0.1.0
+ * @access  public
+ * @package Crypt_Rijndael
+ */
+class Crypt_Rijndael {
+    /**
+     * The Encryption Mode
+     *
+     * @see Crypt_Rijndael::Crypt_Rijndael()
+     * @var Integer
+     * @access private
+     */
+    var $mode;
+
+    /**
+     * The Key
+     *
+     * @see Crypt_Rijndael::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 Crypt_Rijndael::setIV()
+     * @var String
+     * @access private
+     */
+    var $iv = '';
+
+    /**
+     * A "sliding" Initialization Vector
+     *
+     * @see Crypt_Rijndael::enableContinuousBuffer()
+     * @var String
+     * @access private
+     */
+    var $encryptIV = '';
+
+    /**
+     * A "sliding" Initialization Vector
+     *
+     * @see Crypt_Rijndael::enableContinuousBuffer()
+     * @var String
+     * @access private
+     */
+    var $decryptIV = '';
+
+    /**
+     * Continuous Buffer status
+     *
+     * @see Crypt_Rijndael::enableContinuousBuffer()
+     * @var Boolean
+     * @access private
+     */
+    var $continuousBuffer = false;
+
+    /**
+     * Padding status
+     *
+     * @see Crypt_Rijndael::enablePadding()
+     * @var Boolean
+     * @access private
+     */
+    var $padding = true;
+
+    /**
+     * Does the key schedule need to be (re)calculated?
+     *
+     * @see setKey()
+     * @see setBlockLength()
+     * @see setKeyLength()
+     * @var Boolean
+     * @access private
+     */
+    var $changed = true;
+
+    /**
+     * Has the key length explicitly been set or should it be derived from the 
key, itself?
+     *
+     * @see setKeyLength()
+     * @var Boolean
+     * @access private
+     */
+    var $explicit_key_length = false;
+
+    /**
+     * The Key Schedule
+     *
+     * @see _setup()
+     * @var Array
+     * @access private
+     */
+    var $w;
+
+    /**
+     * The Inverse Key Schedule
+     *
+     * @see _setup()
+     * @var Array
+     * @access private
+     */
+    var $dw;
+
+    /**
+     * The Block Length
+     *
+     * @see setBlockLength()
+     * @var Integer
+     * @access private
+     * @internal The max value is 32, the min value is 16.  All valid values 
are multiples of 4.  Exists in conjunction with
+     *     $Nb because we need this value and not $Nb to pad strings 
appropriately.  
+     */
+    var $block_size = 16;
+
+    /**
+     * The Block Length divided by 32
+     *
+     * @see setBlockLength()
+     * @var Integer
+     * @access private
+     * @internal The max value is 256 / 32 = 8, the min value is 128 / 32 = 4. 
 Exists in conjunction with $block_size 
+     *    because the encryption / decryption / key schedule creation requires 
this number and not $block_size.  We could 
+     *    derive this from $block_size or vice versa, but that'd mean we'd 
have to do multiple shift operations, so in lieu
+     *    of that, we'll just precompute it once.
+     *
+     */
+    var $Nb = 4;
+
+    /**
+     * The Key Length
+     *
+     * @see setKeyLength()
+     * @var Integer
+     * @access private
+     * @internal The max value is 256 / 8 = 32, the min value is 128 / 8 = 16. 
 Exists in conjunction with $key_size
+     *    because the encryption / decryption / key schedule creation requires 
this number and not $key_size.  We could 
+     *    derive this from $key_size or vice versa, but that'd mean we'd have 
to do multiple shift operations, so in lieu
+     *    of that, we'll just precompute it once.
+     */
+    var $key_size = 16;
+
+    /**
+     * The Key Length divided by 32
+     *
+     * @see setKeyLength()
+     * @var Integer
+     * @access private
+     * @internal The max value is 256 / 32 = 8, the min value is 128 / 32 = 4
+     */
+    var $Nk = 4;
+
+    /**
+     * The Number of Rounds
+     *
+     * @var Integer
+     * @access private
+     * @internal The max value is 14, the min value is 10.
+     */
+    var $Nr;
+
+    /**
+     * Shift offsets
+     *
+     * @var Array
+     * @access private
+     */
+    var $c;
+
+    /**
+     * Precomputed mixColumns table
+     *
+     * @see Crypt_Rijndael()
+     * @var Array
+     * @access private
+     */
+    var $t0;
+
+    /**
+     * Precomputed mixColumns table
+     *
+     * @see Crypt_Rijndael()
+     * @var Array
+     * @access private
+     */
+    var $t1;
+
+    /**
+     * Precomputed mixColumns table
+     *
+     * @see Crypt_Rijndael()
+     * @var Array
+     * @access private
+     */
+    var $t2;
+
+    /**
+     * Precomputed mixColumns table
+     *
+     * @see Crypt_Rijndael()
+     * @var Array
+     * @access private
+     */
+    var $t3;
+
+    /**
+     * Precomputed invMixColumns table
+     *
+     * @see Crypt_Rijndael()
+     * @var Array
+     * @access private
+     */
+    var $dt0;
+
+    /**
+     * Precomputed invMixColumns table
+     *
+     * @see Crypt_Rijndael()
+     * @var Array
+     * @access private
+     */
+    var $dt1;
+
+    /**
+     * Precomputed invMixColumns table
+     *
+     * @see Crypt_Rijndael()
+     * @var Array
+     * @access private
+     */
+    var $dt2;
+
+    /**
+     * Precomputed invMixColumns table
+     *
+     * @see Crypt_Rijndael()
+     * @var Array
+     * @access private
+     */
+    var $dt3;
+
+    /**
+     * Is the mode one that is paddable?
+     *
+     * @see Crypt_Rijndael::Crypt_Rijndael()
+     * @var Boolean
+     * @access private
+     */
+    var $paddable = false;
+
+    /**
+     * Encryption buffer for CTR, OFB and CFB modes
+     *
+     * @see Crypt_Rijndael::encrypt()
+     * @var String
+     * @access private
+     */
+    var $enbuffer = array('encrypted' => '', 'xor' => '');
+
+    /**
+     * Decryption buffer for CTR, OFB and CFB modes
+     *
+     * @see Crypt_Rijndael::decrypt()
+     * @var String
+     * @access private
+     */
+    var $debuffer = array('ciphertext' => '');
+
+    /**
+     * Default Constructor.
+     *
+     * Determines whether or not the mcrypt extension should be used.  $mode 
should only, at present, be
+     * CRYPT_RIJNDAEL_MODE_ECB or CRYPT_RIJNDAEL_MODE_CBC.  If not explictly 
set, CRYPT_RIJNDAEL_MODE_CBC will be used.
+     *
+     * @param optional Integer $mode
+     * @return Crypt_Rijndael
+     * @access public
+     */
+    function Crypt_Rijndael($mode = CRYPT_RIJNDAEL_MODE_CBC)
+    {
+        switch ($mode) {
+            case CRYPT_RIJNDAEL_MODE_ECB:
+            case CRYPT_RIJNDAEL_MODE_CBC:
+                $this->paddable = true;
+                $this->mode = $mode;
+                break;
+            case CRYPT_RIJNDAEL_MODE_CTR:
+            case CRYPT_RIJNDAEL_MODE_CFB:
+            case CRYPT_RIJNDAEL_MODE_OFB:
+                $this->mode = $mode;
+                break;
+            default:
+                $this->paddable = true;
+                $this->mode = CRYPT_RIJNDAEL_MODE_CBC;
+        }
+
+        $t3 = &$this->t3;
+        $t2 = &$this->t2;
+        $t1 = &$this->t1;
+        $t0 = &$this->t0;
+
+        $dt3 = &$this->dt3;
+        $dt2 = &$this->dt2;
+        $dt1 = &$this->dt1;
+        $dt0 = &$this->dt0;
+
+        // according to 
<http://csrc.nist.gov/archive/aes/rijndael/Rijndael-ammended.pdf#page=19> 
(section 5.2.1), 
+        // precomputed tables can be used in the mixColumns phase.  in that 
example, they're assigned t0...t3, so
+        // those are the names we'll use.
+        $t3 = array(
+            0x6363A5C6, 0x7C7C84F8, 0x777799EE, 0x7B7B8DF6, 0xF2F20DFF, 
0x6B6BBDD6, 0x6F6FB1DE, 0xC5C55491, 
+            0x30305060, 0x01010302, 0x6767A9CE, 0x2B2B7D56, 0xFEFE19E7, 
0xD7D762B5, 0xABABE64D, 0x76769AEC, 
+            0xCACA458F, 0x82829D1F, 0xC9C94089, 0x7D7D87FA, 0xFAFA15EF, 
0x5959EBB2, 0x4747C98E, 0xF0F00BFB, 
+            0xADADEC41, 0xD4D467B3, 0xA2A2FD5F, 0xAFAFEA45, 0x9C9CBF23, 
0xA4A4F753, 0x727296E4, 0xC0C05B9B, 
+            0xB7B7C275, 0xFDFD1CE1, 0x9393AE3D, 0x26266A4C, 0x36365A6C, 
0x3F3F417E, 0xF7F702F5, 0xCCCC4F83, 
+            0x34345C68, 0xA5A5F451, 0xE5E534D1, 0xF1F108F9, 0x717193E2, 
0xD8D873AB, 0x31315362, 0x15153F2A, 
+            0x04040C08, 0xC7C75295, 0x23236546, 0xC3C35E9D, 0x18182830, 
0x9696A137, 0x05050F0A, 0x9A9AB52F, 
+            0x0707090E, 0x12123624, 0x80809B1B, 0xE2E23DDF, 0xEBEB26CD, 
0x2727694E, 0xB2B2CD7F, 0x75759FEA, 
+            0x09091B12, 0x83839E1D, 0x2C2C7458, 0x1A1A2E34, 0x1B1B2D36, 
0x6E6EB2DC, 0x5A5AEEB4, 0xA0A0FB5B, 
+            0x5252F6A4, 0x3B3B4D76, 0xD6D661B7, 0xB3B3CE7D, 0x29297B52, 
0xE3E33EDD, 0x2F2F715E, 0x84849713, 
+            0x5353F5A6, 0xD1D168B9, 0x00000000, 0xEDED2CC1, 0x20206040, 
0xFCFC1FE3, 0xB1B1C879, 0x5B5BEDB6, 
+            0x6A6ABED4, 0xCBCB468D, 0xBEBED967, 0x39394B72, 0x4A4ADE94, 
0x4C4CD498, 0x5858E8B0, 0xCFCF4A85, 
+            0xD0D06BBB, 0xEFEF2AC5, 0xAAAAE54F, 0xFBFB16ED, 0x4343C586, 
0x4D4DD79A, 0x33335566, 0x85859411, 
+            0x4545CF8A, 0xF9F910E9, 0x02020604, 0x7F7F81FE, 0x5050F0A0, 
0x3C3C4478, 0x9F9FBA25, 0xA8A8E34B, 
+            0x5151F3A2, 0xA3A3FE5D, 0x4040C080, 0x8F8F8A05, 0x9292AD3F, 
0x9D9DBC21, 0x38384870, 0xF5F504F1, 
+            0xBCBCDF63, 0xB6B6C177, 0xDADA75AF, 0x21216342, 0x10103020, 
0xFFFF1AE5, 0xF3F30EFD, 0xD2D26DBF, 
+            0xCDCD4C81, 0x0C0C1418, 0x13133526, 0xECEC2FC3, 0x5F5FE1BE, 
0x9797A235, 0x4444CC88, 0x1717392E, 
+            0xC4C45793, 0xA7A7F255, 0x7E7E82FC, 0x3D3D477A, 0x6464ACC8, 
0x5D5DE7BA, 0x19192B32, 0x737395E6, 
+            0x6060A0C0, 0x81819819, 0x4F4FD19E, 0xDCDC7FA3, 0x22226644, 
0x2A2A7E54, 0x9090AB3B, 0x8888830B, 
+            0x4646CA8C, 0xEEEE29C7, 0xB8B8D36B, 0x14143C28, 0xDEDE79A7, 
0x5E5EE2BC, 0x0B0B1D16, 0xDBDB76AD, 
+            0xE0E03BDB, 0x32325664, 0x3A3A4E74, 0x0A0A1E14, 0x4949DB92, 
0x06060A0C, 0x24246C48, 0x5C5CE4B8, 
+            0xC2C25D9F, 0xD3D36EBD, 0xACACEF43, 0x6262A6C4, 0x9191A839, 
0x9595A431, 0xE4E437D3, 0x79798BF2, 
+            0xE7E732D5, 0xC8C8438B, 0x3737596E, 0x6D6DB7DA, 0x8D8D8C01, 
0xD5D564B1, 0x4E4ED29C, 0xA9A9E049, 
+            0x6C6CB4D8, 0x5656FAAC, 0xF4F407F3, 0xEAEA25CF, 0x6565AFCA, 
0x7A7A8EF4, 0xAEAEE947, 0x08081810, 
+            0xBABAD56F, 0x787888F0, 0x25256F4A, 0x2E2E725C, 0x1C1C2438, 
0xA6A6F157, 0xB4B4C773, 0xC6C65197, 
+            0xE8E823CB, 0xDDDD7CA1, 0x74749CE8, 0x1F1F213E, 0x4B4BDD96, 
0xBDBDDC61, 0x8B8B860D, 0x8A8A850F, 
+            0x707090E0, 0x3E3E427C, 0xB5B5C471, 0x6666AACC, 0x4848D890, 
0x03030506, 0xF6F601F7, 0x0E0E121C, 
+            0x6161A3C2, 0x35355F6A, 0x5757F9AE, 0xB9B9D069, 0x86869117, 
0xC1C15899, 0x1D1D273A, 0x9E9EB927, 
+            0xE1E138D9, 0xF8F813EB, 0x9898B32B, 0x11113322, 0x6969BBD2, 
0xD9D970A9, 0x8E8E8907, 0x9494A733, 
+            0x9B9BB62D, 0x1E1E223C, 0x87879215, 0xE9E920C9, 0xCECE4987, 
0x5555FFAA, 0x28287850, 0xDFDF7AA5, 
+            0x8C8C8F03, 0xA1A1F859, 0x89898009, 0x0D0D171A, 0xBFBFDA65, 
0xE6E631D7, 0x4242C684, 0x6868B8D0, 
+            0x4141C382, 0x9999B029, 0x2D2D775A, 0x0F0F111E, 0xB0B0CB7B, 
0x5454FCA8, 0xBBBBD66D, 0x16163A2C
+        );
+
+        $dt3 = array(
+            0xF4A75051, 0x4165537E, 0x17A4C31A, 0x275E963A, 0xAB6BCB3B, 
0x9D45F11F, 0xFA58ABAC, 0xE303934B, 
+            0x30FA5520, 0x766DF6AD, 0xCC769188, 0x024C25F5, 0xE5D7FC4F, 
0x2ACBD7C5, 0x35448026, 0x62A38FB5, 
+            0xB15A49DE, 0xBA1B6725, 0xEA0E9845, 0xFEC0E15D, 0x2F7502C3, 
0x4CF01281, 0x4697A38D, 0xD3F9C66B, 
+            0x8F5FE703, 0x929C9515, 0x6D7AEBBF, 0x5259DA95, 0xBE832DD4, 
0x7421D358, 0xE0692949, 0xC9C8448E, 
+            0xC2896A75, 0x8E7978F4, 0x583E6B99, 0xB971DD27, 0xE14FB6BE, 
0x88AD17F0, 0x20AC66C9, 0xCE3AB47D, 
+            0xDF4A1863, 0x1A3182E5, 0x51336097, 0x537F4562, 0x6477E0B1, 
0x6BAE84BB, 0x81A01CFE, 0x082B94F9, 
+            0x48685870, 0x45FD198F, 0xDE6C8794, 0x7BF8B752, 0x73D323AB, 
0x4B02E272, 0x1F8F57E3, 0x55AB2A66, 
+            0xEB2807B2, 0xB5C2032F, 0xC57B9A86, 0x3708A5D3, 0x2887F230, 
0xBFA5B223, 0x036ABA02, 0x16825CED, 
+            0xCF1C2B8A, 0x79B492A7, 0x07F2F0F3, 0x69E2A14E, 0xDAF4CD65, 
0x05BED506, 0x34621FD1, 0xA6FE8AC4, 
+            0x2E539D34, 0xF355A0A2, 0x8AE13205, 0xF6EB75A4, 0x83EC390B, 
0x60EFAA40, 0x719F065E, 0x6E1051BD, 
+            0x218AF93E, 0xDD063D96, 0x3E05AEDD, 0xE6BD464D, 0x548DB591, 
0xC45D0571, 0x06D46F04, 0x5015FF60, 
+            0x98FB2419, 0xBDE997D6, 0x4043CC89, 0xD99E7767, 0xE842BDB0, 
0x898B8807, 0x195B38E7, 0xC8EEDB79, 
+            0x7C0A47A1, 0x420FE97C, 0x841EC9F8, 0x00000000, 0x80868309, 
0x2BED4832, 0x1170AC1E, 0x5A724E6C, 
+            0x0EFFFBFD, 0x8538560F, 0xAED51E3D, 0x2D392736, 0x0FD9640A, 
0x5CA62168, 0x5B54D19B, 0x362E3A24, 
+            0x0A67B10C, 0x57E70F93, 0xEE96D2B4, 0x9B919E1B, 0xC0C54F80, 
0xDC20A261, 0x774B695A, 0x121A161C, 
+            0x93BA0AE2, 0xA02AE5C0, 0x22E0433C, 0x1B171D12, 0x090D0B0E, 
0x8BC7ADF2, 0xB6A8B92D, 0x1EA9C814, 
+            0xF1198557, 0x75074CAF, 0x99DDBBEE, 0x7F60FDA3, 0x01269FF7, 
0x72F5BC5C, 0x663BC544, 0xFB7E345B, 
+            0x4329768B, 0x23C6DCCB, 0xEDFC68B6, 0xE4F163B8, 0x31DCCAD7, 
0x63851042, 0x97224013, 0xC6112084, 
+            0x4A247D85, 0xBB3DF8D2, 0xF93211AE, 0x29A16DC7, 0x9E2F4B1D, 
0xB230F3DC, 0x8652EC0D, 0xC1E3D077, 
+            0xB3166C2B, 0x70B999A9, 0x9448FA11, 0xE9642247, 0xFC8CC4A8, 
0xF03F1AA0, 0x7D2CD856, 0x3390EF22, 
+            0x494EC787, 0x38D1C1D9, 0xCAA2FE8C, 0xD40B3698, 0xF581CFA6, 
0x7ADE28A5, 0xB78E26DA, 0xADBFA43F, 
+            0x3A9DE42C, 0x78920D50, 0x5FCC9B6A, 0x7E466254, 0x8D13C2F6, 
0xD8B8E890, 0x39F75E2E, 0xC3AFF582, 
+            0x5D80BE9F, 0xD0937C69, 0xD52DA96F, 0x2512B3CF, 0xAC993BC8, 
0x187DA710, 0x9C636EE8, 0x3BBB7BDB, 
+            0x267809CD, 0x5918F46E, 0x9AB701EC, 0x4F9AA883, 0x956E65E6, 
0xFFE67EAA, 0xBCCF0821, 0x15E8E6EF, 
+            0xE79BD9BA, 0x6F36CE4A, 0x9F09D4EA, 0xB07CD629, 0xA4B2AF31, 
0x3F23312A, 0xA59430C6, 0xA266C035, 
+            0x4EBC3774, 0x82CAA6FC, 0x90D0B0E0, 0xA7D81533, 0x04984AF1, 
0xECDAF741, 0xCD500E7F, 0x91F62F17, 
+            0x4DD68D76, 0xEFB04D43, 0xAA4D54CC, 0x9604DFE4, 0xD1B5E39E, 
0x6A881B4C, 0x2C1FB8C1, 0x65517F46, 
+            0x5EEA049D, 0x8C355D01, 0x877473FA, 0x0B412EFB, 0x671D5AB3, 
0xDBD25292, 0x105633E9, 0xD647136D, 
+            0xD7618C9A, 0xA10C7A37, 0xF8148E59, 0x133C89EB, 0xA927EECE, 
0x61C935B7, 0x1CE5EDE1, 0x47B13C7A, 
+            0xD2DF599C, 0xF2733F55, 0x14CE7918, 0xC737BF73, 0xF7CDEA53, 
0xFDAA5B5F, 0x3D6F14DF, 0x44DB8678, 
+            0xAFF381CA, 0x68C43EB9, 0x24342C38, 0xA3405FC2, 0x1DC37216, 
0xE2250CBC, 0x3C498B28, 0x0D9541FF, 
+            0xA8017139, 0x0CB3DE08, 0xB4E49CD8, 0x56C19064, 0xCB84617B, 
0x32B670D5, 0x6C5C7448, 0xB85742D0
+        );
+
+        for ($i = 0; $i < 256; $i++) {
+            $t2[$i <<  8] = (($t3[$i] <<  8) & 0xFFFFFF00) | (($t3[$i] >> 24) 
& 0x000000FF);
+            $t1[$i << 16] = (($t3[$i] << 16) & 0xFFFF0000) | (($t3[$i] >> 16) 
& 0x0000FFFF);
+            $t0[$i << 24] = (($t3[$i] << 24) & 0xFF000000) | (($t3[$i] >>  8) 
& 0x00FFFFFF);
+
+            $dt2[$i <<  8] = (($this->dt3[$i] <<  8) & 0xFFFFFF00) | 
(($dt3[$i] >> 24) & 0x000000FF);
+            $dt1[$i << 16] = (($this->dt3[$i] << 16) & 0xFFFF0000) | 
(($dt3[$i] >> 16) & 0x0000FFFF);
+            $dt0[$i << 24] = (($this->dt3[$i] << 24) & 0xFF000000) | 
(($dt3[$i] >>  8) & 0x00FFFFFF);
+        }
+    }
+
+    /**
+     * Sets the key.
+     *
+     * Keys can be of any length.  Rijndael, itself, requires the use of a key 
that's between 128-bits and 256-bits long and
+     * whose length is a multiple of 32.  If the key is less than 256-bits and 
the key length isn't set, we round the length
+     * up to the closest valid key length, padding $key with null bytes.  If 
the key is more than 256-bits, we trim the
+     * excess bits.
+     *
+     * If the key is not explicitly set, it'll be assumed to be all null bytes.
+     *
+     * @access public
+     * @param String $key
+     */
+    function setKey($key)
+    {
+        $this->key = $key;
+        $this->changed = true;
+    }
+
+    /**
+     * Sets the initialization vector. (optional)
+     *
+     * SetIV is not required when CRYPT_RIJNDAEL_MODE_ECB is being used.  If 
not explictly set, it'll be assumed
+     * to be all zero's.
+     *
+     * @access public
+     * @param String $iv
+     */
+    function setIV($iv)
+    {
+        $this->encryptIV = $this->decryptIV = $this->iv = str_pad(substr($iv, 
0, $this->block_size), $this->block_size, chr(0));;
+    }
+
+    /**
+     * Sets the key length
+     *
+     * Valid key lengths are 128, 160, 192, 224, and 256.  If the length is 
less than 128, it will be rounded up to
+     * 128.  If the length is greater then 128 and invalid, it will be rounded 
down to the closest valid amount.
+     *
+     * @access public
+     * @param Integer $length
+     */
+    function setKeyLength($length)
+    {
+        $length >>= 5;
+        if ($length > 8) {
+            $length = 8;
+        } else if ($length < 4) {
+            $length = 4;
+        }
+        $this->Nk = $length;
+        $this->key_size = $length << 2;
+
+        $this->explicit_key_length = true;
+        $this->changed = true;
+    }
+
+    /**
+     * Sets the block length
+     *
+     * Valid block lengths are 128, 160, 192, 224, and 256.  If the length is 
less than 128, it will be rounded up to
+     * 128.  If the length is greater then 128 and invalid, it will be rounded 
down to the closest valid amount.
+     *
+     * @access public
+     * @param Integer $length
+     */
+    function setBlockLength($length)
+    {
+        $length >>= 5;
+        if ($length > 8) {
+            $length = 8;
+        } else if ($length < 4) {
+            $length = 4;
+        }
+        $this->Nb = $length;
+        $this->block_size = $length << 2;
+        $this->changed = true;
+    }
+
+    /**
+     * Generate CTR XOR encryption key
+     *
+     * Encrypt the output of this and XOR it against the ciphertext / 
plaintext to get the
+     * plaintext / ciphertext in CTR mode.
+     *
+     * @see Crypt_Rijndael::decrypt()
+     * @see Crypt_Rijndael::encrypt()
+     * @access public
+     * @param Integer $length
+     * @param String $iv
+     */
+    function _generate_xor($length, &$iv)
+    {
+        $xor = '';
+        $block_size = $this->block_size;
+        $num_blocks = floor(($length + ($block_size - 1)) / $block_size);
+        for ($i = 0; $i < $num_blocks; $i++) {
+            $xor.= $iv;
+            for ($j = 4; $j <= $block_size; $j+=4) {
+                $temp = substr($iv, -$j, 4);
+                switch ($temp) {
+                    case "\xFF\xFF\xFF\xFF":
+                        $iv = substr_replace($iv, "\x00\x00\x00\x00", -$j, 4);
+                        break;
+                    case "\x7F\xFF\xFF\xFF":
+                        $iv = substr_replace($iv, "\x80\x00\x00\x00", -$j, 4);
+                        break 2;
+                    default:
+                        extract(unpack('Ncount', $temp));
+                        $iv = substr_replace($iv, pack('N', $count + 1), -$j, 
4);
+                        break 2;
+                }
+            }
+        }
+
+        return $xor;
+    }
+
+    /**
+     * Encrypts a message.
+     *
+     * $plaintext will be padded with additional bytes such that it's length 
is a multiple of the block size.  Other Rjindael
+     * implementations may or may not pad in the same manner.  Other common 
approaches to padding and the reasons why it's
+     * necessary are discussed in the following
+     * URL:
+     *
+     * {@link http://www.di-mgt.com.au/cryptopad.html 
http://www.di-mgt.com.au/cryptopad.html}
+     *
+     * An alternative to padding is to, separately, send the length of the 
file.  This is what SSH, in fact, does.
+     * strlen($plaintext) will still need to be a multiple of 8, however, 
arbitrary values can be added to make it that
+     * length.
+     *
+     * @see Crypt_Rijndael::decrypt()
+     * @access public
+     * @param String $plaintext
+     */
+    function encrypt($plaintext)
+    {
+        $this->_setup();
+        if ($this->paddable) {
+            $plaintext = $this->_pad($plaintext);
+        }
+
+        $block_size = $this->block_size;
+        $buffer = &$this->enbuffer;
+        $continuousBuffer = $this->continuousBuffer;
+        $ciphertext = '';
+        switch ($this->mode) {
+            case CRYPT_RIJNDAEL_MODE_ECB:
+                for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
+                    $ciphertext.= $this->_encryptBlock(substr($plaintext, $i, 
$block_size));
+                }
+                break;
+            case CRYPT_RIJNDAEL_MODE_CBC:
+                $xor = $this->encryptIV;
+                for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
+                    $block = substr($plaintext, $i, $block_size);
+                    $block = $this->_encryptBlock($block ^ $xor);
+                    $xor = $block;
+                    $ciphertext.= $block;
+                }
+                if ($this->continuousBuffer) {
+                    $this->encryptIV = $xor;
+                }
+                break;
+            case CRYPT_RIJNDAEL_MODE_CTR:
+                $xor = $this->encryptIV;
+                if (!empty($buffer)) {
+                    for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
+                        $block = substr($plaintext, $i, $block_size);
+                        $buffer.= 
$this->_encryptBlock($this->_generate_xor($block_size, $xor));
+                        $key = $this->_string_shift($buffer, $block_size);
+                        $ciphertext.= $block ^ $key;
+                    }
+                } else {
+                    for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
+                        $block = substr($plaintext, $i, $block_size);
+                        $key = 
$this->_encryptBlock($this->_generate_xor($block_size, $xor));
+                        $ciphertext.= $block ^ $key;
+                    }
+                }
+                if ($this->continuousBuffer) {
+                    $this->encryptIV = $xor;
+                    if ($start = strlen($plaintext) % $block_size) {
+                        $buffer = substr($key, $start) . $buffer;
+                    }
+                }
+                break;
+            case CRYPT_RIJNDAEL_MODE_CFB:
+                if (!empty($buffer['xor'])) {
+                    $ciphertext = $plaintext ^ $buffer['xor'];
+                    $iv = $buffer['encrypted'] . $ciphertext;
+                    $start = strlen($ciphertext);
+                    $buffer['encrypted'].= $ciphertext;
+                    $buffer['xor'] = substr($buffer['xor'], 
strlen($ciphertext));
+                } else {
+                    $ciphertext = '';
+                    $iv = $this->encryptIV;
+                    $start = 0;
+                }
+
+                for ($i = $start; $i < strlen($plaintext); $i+=$block_size) {
+                    $block = substr($plaintext, $i, $block_size);
+                    $xor = $this->_encryptBlock($iv);
+                    $iv = $block ^ $xor;
+                    if ($continuousBuffer && strlen($iv) != $block_size) {
+                        $buffer = array(
+                            'encrypted' => $iv,
+                            'xor' => substr($xor, strlen($iv))
+                        );
+                    }
+                    $ciphertext.= $iv;
+                }
+
+                if ($this->continuousBuffer) {
+                    $this->encryptIV = $iv;
+                }
+                break;
+            case CRYPT_RIJNDAEL_MODE_OFB:
+                $xor = $this->encryptIV;
+                if (strlen($buffer)) {
+                    for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
+                        $xor = $this->_encryptBlock($xor);
+                        $buffer.= $xor;
+                        $key = $this->_string_shift($buffer, $block_size);
+                        $ciphertext.= substr($plaintext, $i, $block_size) ^ 
$key;
+                    }
+                } else {
+                    for ($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) {
+                         $buffer = substr($key, $start) . $buffer;
+                    }
+                }
+        }
+
+        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 Crypt_Rijndael::encrypt()
+     * @access public
+     * @param String $ciphertext
+     */
+    function decrypt($ciphertext)
+    {
+        $this->_setup();
+
+        if ($this->paddable) {
+            // we pad with chr(0) since that's what mcrypt_generic does.  to 
quote from http://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));
+        }
+
+        $block_size = $this->block_size;
+        $buffer = &$this->debuffer;
+        $continuousBuffer = $this->continuousBuffer;
+        $plaintext = '';
+        switch ($this->mode) {
+            case CRYPT_RIJNDAEL_MODE_ECB:
+                for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
+                    $plaintext.= $this->_decryptBlock(substr($ciphertext, $i, 
$block_size));
+                }
+                break;
+            case CRYPT_RIJNDAEL_MODE_CBC:
+                $xor = $this->decryptIV;
+                for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
+                    $block = substr($ciphertext, $i, $block_size);
+                    $plaintext.= $this->_decryptBlock($block) ^ $xor;
+                    $xor = $block;
+                }
+                if ($this->continuousBuffer) {
+                    $this->decryptIV = $xor;
+                }
+                break;
+            case CRYPT_RIJNDAEL_MODE_CTR:
+                $xor = $this->decryptIV;
+                if (strlen($buffer)) {
+                    for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
+                        $block = substr($ciphertext, $i, $block_size);
+                        $buffer.= 
$this->_encryptBlock($this->_generate_xor($block_size, $xor));
+                        $key = $this->_string_shift($buffer, $block_size);
+                        $plaintext.= $block ^ $key;
+                    }
+                } else {
+                    for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
+                        $block = substr($ciphertext, $i, $block_size);
+                        $key = 
$this->_encryptBlock($this->_generate_xor($block_size, $xor));
+                        $plaintext.= $block ^ $key;
+                    }
+                }
+                if ($this->continuousBuffer) {
+                    $this->decryptIV = $xor;
+                    if ($start = strlen($ciphertext) % $block_size) {
+                        $buffer = substr($key, $start) . $buffer;
+                    }
+                }
+                break;
+            case CRYPT_RIJNDAEL_MODE_CFB:
+                if (!empty($buffer['ciphertext'])) {
+                    $plaintext = $ciphertext ^ substr($this->decryptIV, 
strlen($buffer['ciphertext']));
+                    $buffer['ciphertext'].= substr($ciphertext, 0, 
strlen($plaintext));
+                    if (strlen($buffer['ciphertext']) == $block_size) {
+                        $xor = $this->_encryptBlock($buffer['ciphertext']);
+                        $buffer['ciphertext'] = '';
+                    }
+                    $start = strlen($plaintext);
+                    $block = $this->decryptIV;
+                } else {
+                    $plaintext = '';
+                    $xor = $this->_encryptBlock($this->decryptIV);
+                    $start = 0;
+                }
+
+                for ($i = $start; $i < strlen($ciphertext); $i+=$block_size) {
+                    $block = substr($ciphertext, $i, $block_size);
+                    $plaintext.= $block ^ $xor;
+                    if ($continuousBuffer && strlen($block) != $block_size) {
+                        $buffer['ciphertext'].= $block;
+                        $block = $xor;
+                    } else if (strlen($block) == $block_size) {
+                        $xor = $this->_encryptBlock($block);
+                    }
+                }
+                if ($this->continuousBuffer) {
+                    $this->decryptIV = $block;
+                }
+                break;
+            case CRYPT_RIJNDAEL_MODE_OFB:
+                $xor = $this->decryptIV;
+                if (strlen($buffer)) {
+                    for ($i = 0; $i < strlen($ciphertext); $i+=$block_size) {
+                        $xor = $this->_encryptBlock($xor);
+                        $buffer.= $xor;
+                        $key = $this->_string_shift($buffer, $block_size);
+                        $plaintext.= substr($ciphertext, $i, $block_size) ^ 
$key;
+                    }
+                } else {
+                    for ($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) {
+                         $buffer = substr($key, $start) . $buffer;
+                    }
+                }
+        }
+
+        return $this->paddable ? $this->_unpad($plaintext) : $plaintext;
+    }
+
+    /**
+     * Encrypts a block
+     *
+     * @access private
+     * @param String $in
+     * @return String
+     */
+    function _encryptBlock($in)
+    {
+        $state = array();
+        $words = unpack('N*word', $in);
+
+        $w = $this->w;
+        $t0 = $this->t0;
+        $t1 = $this->t1;
+        $t2 = $this->t2;
+        $t3 = $this->t3;
+        $Nb = $this->Nb;
+        $Nr = $this->Nr;
+        $c = $this->c;
+
+        // addRoundKey
+        $i = 0;
+        foreach ($words as $word) {
+            $state[] = $word ^ $w[0][$i++];
+        }
+
+        // fips-197.pdf#page=19, "Figure 5. Pseudo Code for the Cipher", 
states that this loop has four components - 
+        // subBytes, shiftRows, mixColumns, and addRoundKey. 
fips-197.pdf#page=30, "Implementation Suggestions Regarding 
+        // Various Platforms" suggests that performs enhanced implementations 
are described in Rijndael-ammended.pdf.
+        // Rijndael-ammended.pdf#page=20, "Implementation aspects / 32-bit 
processor", discusses such an optimization.
+        // Unfortunately, the description given there is not quite correct.  
Per aes.spec.v316.pdf#page=19 [1], 
+        // equation (7.4.7) is supposed to use addition instead of 
subtraction, so we'll do that here, as well.
+
+        // [1] 
http://fp.gladman.plus.com/cryptography_technology/rijndael/aes.spec.v316.pdf
+        $temp = array();
+        for ($round = 1; $round < $Nr; $round++) {
+            $i = 0; // $c[0] == 0
+            $j = $c[1];
+            $k = $c[2];
+            $l = $c[3];
+
+            while ($i < $this->Nb) {
+                $temp[$i] = $t0[$state[$i] & 0xFF000000] ^ 
+                            $t1[$state[$j] & 0x00FF0000] ^ 
+                            $t2[$state[$k] & 0x0000FF00] ^ 
+                            $t3[$state[$l] & 0x000000FF] ^ 
+                            $w[$round][$i];
+                $i++;
+                $j = ($j + 1) % $Nb;
+                $k = ($k + 1) % $Nb;
+                $l = ($l + 1) % $Nb;
+            }
+
+            for ($i = 0; $i < $Nb; $i++) {
+                $state[$i] = $temp[$i];
+            }
+        }
+
+        // subWord
+        for ($i = 0; $i < $Nb; $i++) {
+            $state[$i] = $this->_subWord($state[$i]);
+        }
+
+        // shiftRows + addRoundKey
+        $i = 0; // $c[0] == 0
+        $j = $c[1];
+        $k = $c[2];
+        $l = $c[3];
+        while ($i < $this->Nb) {
+            $temp[$i] = ($state[$i] & 0xFF000000) ^ 
+                        ($state[$j] & 0x00FF0000) ^ 
+                        ($state[$k] & 0x0000FF00) ^ 
+                        ($state[$l] & 0x000000FF) ^
+                         $w[$Nr][$i];
+            $i++;
+            $j = ($j + 1) % $Nb;
+            $k = ($k + 1) % $Nb;
+            $l = ($l + 1) % $Nb;
+        }
+        $state = $temp;
+
+        array_unshift($state, 'N*');
+
+        return call_user_func_array('pack', $state);
+    }
+
+    /**
+     * Decrypts a block
+     *
+     * @access private
+     * @param String $in
+     * @return String
+     */
+    function _decryptBlock($in)
+    {
+        $state = array();
+        $words = unpack('N*word', $in);
+
+        $num_states = count($state);
+        $dw = $this->dw;
+        $dt0 = $this->dt0;
+        $dt1 = $this->dt1;
+        $dt2 = $this->dt2;
+        $dt3 = $this->dt3;
+        $Nb = $this->Nb;
+        $Nr = $this->Nr;
+        $c = $this->c;
+
+        // addRoundKey
+        $i = 0;
+        foreach ($words as $word) {
+            $state[] = $word ^ $dw[$Nr][$i++];
+        }
+
+        $temp = array();
+        for ($round = $Nr - 1; $round > 0; $round--) {
+            $i = 0; // $c[0] == 0
+            $j = $Nb - $c[1];
+            $k = $Nb - $c[2];
+            $l = $Nb - $c[3];
+
+            while ($i < $Nb) {
+                $temp[$i] = $dt0[$state[$i] & 0xFF000000] ^ 
+                            $dt1[$state[$j] & 0x00FF0000] ^ 
+                            $dt2[$state[$k] & 0x0000FF00] ^ 
+                            $dt3[$state[$l] & 0x000000FF] ^ 
+                            $dw[$round][$i];
+                $i++;
+                $j = ($j + 1) % $Nb;
+                $k = ($k + 1) % $Nb;
+                $l = ($l + 1) % $Nb;
+            }
+
+            for ($i = 0; $i < $Nb; $i++) {
+                $state[$i] = $temp[$i];
+            }
+        }
+
+        // invShiftRows + invSubWord + addRoundKey
+        $i = 0; // $c[0] == 0
+        $j = $Nb - $c[1];
+        $k = $Nb - $c[2];
+        $l = $Nb - $c[3];
+
+        while ($i < $Nb) {
+            $temp[$i] = $dw[0][$i] ^ 
+                        $this->_invSubWord(($state[$i] & 0xFF000000) | 
+                                           ($state[$j] & 0x00FF0000) | 
+                                           ($state[$k] & 0x0000FF00) | 
+                                           ($state[$l] & 0x000000FF));
+            $i++;
+            $j = ($j + 1) % $Nb;
+            $k = ($k + 1) % $Nb;
+            $l = ($l + 1) % $Nb;
+        }
+
+        $state = $temp;
+
+        array_unshift($state, 'N*');
+
+        return call_user_func_array('pack', $state);
+    }
+
+    /**
+     * Setup Rijndael
+     *
+     * Validates all the variables and calculates $Nr - the number of rounds 
that need to be performed - and $w - the key
+     * key schedule.
+     *
+     * @access private
+     */
+    function _setup()
+    {
+        // Each number in $rcon is equal to the previous number multiplied by 
two in Rijndael's finite field.
+        // See 
http://en.wikipedia.org/wiki/Finite_field_arithmetic#Multiplicative_inverse
+        static $rcon = array(0,
+            0x01000000, 0x02000000, 0x04000000, 0x08000000, 0x10000000,
+            0x20000000, 0x40000000, 0x80000000, 0x1B000000, 0x36000000,
+            0x6C000000, 0xD8000000, 0xAB000000, 0x4D000000, 0x9A000000,
+            0x2F000000, 0x5E000000, 0xBC000000, 0x63000000, 0xC6000000,
+            0x97000000, 0x35000000, 0x6A000000, 0xD4000000, 0xB3000000,
+            0x7D000000, 0xFA000000, 0xEF000000, 0xC5000000, 0x91000000
+        );
+
+        if (!$this->changed) {
+            return;
+        }
+
+        if (!$this->explicit_key_length) {
+            // we do >> 2, here, and not >> 5, as we do above, since 
strlen($this->key) tells us the number of bytes - not bits
+            $length = strlen($this->key) >> 2;
+            if ($length > 8) {
+                $length = 8;
+            } else if ($length < 4) {
+                $length = 4;
+            }
+            $this->Nk = $length;
+            $this->key_size = $length << 2;
+        }
+
+        $this->key = str_pad(substr($this->key, 0, $this->key_size), 
$this->key_size, chr(0));
+        $this->encryptIV = $this->decryptIV = $this->iv = 
str_pad(substr($this->iv, 0, $this->block_size), $this->block_size, chr(0));
+
+        // see Rijndael-ammended.pdf#page=44
+        $this->Nr = max($this->Nk, $this->Nb) + 6;
+
+        // shift offsets for Nb = 5, 7 are defined in 
Rijndael-ammended.pdf#page=44,
+        //     "Table 8: Shift offsets in Shiftrow for the alternative block 
lengths"
+        // shift offsets for Nb = 4, 6, 8 are defined in 
Rijndael-ammended.pdf#page=14,
+        //     "Table 2: Shift offsets for different block lengths"
+        switch ($this->Nb) {
+            case 4:
+            case 5:
+            case 6:
+                $this->c = array(0, 1, 2, 3);
+                break;
+            case 7:
+                $this->c = array(0, 1, 2, 4);
+                break;
+            case 8:
+                $this->c = array(0, 1, 3, 4);
+        }
+
+        $key = $this->key;
+
+        $w = array_values(unpack('N*words', $key));
+
+        $length = $this->Nb * ($this->Nr + 1);
+        for ($i = $this->Nk; $i < $length; $i++) {
+            $temp = $w[$i - 1];
+            if ($i % $this->Nk == 0) {
+                // according to <http://php.net/language.types.integer>, "the 
size of an integer is platform-dependent".
+                // on a 32-bit machine, it's 32-bits, and on a 64-bit machine, 
it's 64-bits. on a 32-bit machine,
+                // 0xFFFFFFFF << 8 == 0xFFFFFF00, but on a 64-bit machine, it 
equals 0xFFFFFFFF00. as such, doing 'and'
+                // with 0xFFFFFFFF (or 0xFFFFFF00) on a 32-bit machine is 
unnecessary, but on a 64-bit machine, it is.
+                $temp = (($temp << 8) & 0xFFFFFF00) | (($temp >> 24) & 
0x000000FF); // rotWord
+                $temp = $this->_subWord($temp) ^ $rcon[$i / $this->Nk];
+            } else if ($this->Nk > 6 && $i % $this->Nk == 4) {
+                $temp = $this->_subWord($temp);
+            }
+            $w[$i] = $w[$i - $this->Nk] ^ $temp;
+        }
+
+        // convert the key schedule from a vector of $Nb * ($Nr + 1) length to 
a matrix with $Nr + 1 rows and $Nb columns
+        // and generate the inverse key schedule.  more specifically,
+        // according to 
<http://csrc.nist.gov/archive/aes/rijndael/Rijndael-ammended.pdf#page=23> 
(section 5.3.3), 
+        // "The key expansion for the Inverse Cipher is defined as follows:
+        //        1. Apply the Key Expansion.
+        //        2. Apply InvMixColumn to all Round Keys except the first and 
the last one."
+        // also, see fips-197.pdf#page=27, "5.3.5 Equivalent Inverse Cipher"
+        $temp = array();
+        for ($i = $row = $col = 0; $i < $length; $i++, $col++) {
+            if ($col == $this->Nb) {
+                if ($row == 0) {
+                    $this->dw[0] = $this->w[0];
+                } else {
+                    // subWord + invMixColumn + invSubWord = invMixColumn
+                    $j = 0;
+                    while ($j < $this->Nb) {
+                        $dw = $this->_subWord($this->w[$row][$j]);
+                        $temp[$j] = $this->dt0[$dw & 0xFF000000] ^ 
+                                    $this->dt1[$dw & 0x00FF0000] ^ 
+                                    $this->dt2[$dw & 0x0000FF00] ^ 
+                                    $this->dt3[$dw & 0x000000FF];
+                        $j++;
+                    }
+                    $this->dw[$row] = $temp;
+                }
+
+                $col = 0;
+                $row++;
+            }
+            $this->w[$row][$col] = $w[$i];
+        }
+
+        $this->dw[$row] = $this->w[$row];
+
+        $this->changed = false;
+    }
+
+    /**
+     * Performs S-Box substitutions
+     *
+     * @access private
+     */
+    function _subWord($word)
+    {
+        static $sbox0, $sbox1, $sbox2, $sbox3;
+
+        if (empty($sbox0)) {
+            $sbox0 = array(
+                0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 
0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76,
+                0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 
0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0,
+                0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 
0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15,
+                0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 
0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75,
+                0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0, 0x52, 0x3B, 
0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84,
+                0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B, 0x6A, 0xCB, 
0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF,
+                0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, 0x45, 0xF9, 
0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8,
+                0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5, 0xBC, 0xB6, 
0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2,
+                0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 
0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73,
+                0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 
0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB,
+                0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C, 0xC2, 0xD3, 
0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79,
+                0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 
0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08,
+                0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 
0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A,
+                0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E, 0x61, 0x35, 
0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E,
+                0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94, 0x9B, 0x1E, 
0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF,
+                0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, 0x41, 0x99, 
0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16
+            );
+
+            $sbox1 = array();
+            $sbox2 = array();
+            $sbox3 = array();
+
+            for ($i = 0; $i < 256; $i++) {
+                $sbox1[$i <<  8] = $sbox0[$i] <<  8;
+                $sbox2[$i << 16] = $sbox0[$i] << 16;
+                $sbox3[$i << 24] = $sbox0[$i] << 24;
+            }
+        }
+
+        return $sbox0[$word & 0x000000FF] | 
+               $sbox1[$word & 0x0000FF00] | 
+               $sbox2[$word & 0x00FF0000] | 
+               $sbox3[$word & 0xFF000000];
+    }
+
+    /**
+     * Performs inverse S-Box substitutions
+     *
+     * @access private
+     */
+    function _invSubWord($word)
+    {
+        static $sbox0, $sbox1, $sbox2, $sbox3;
+
+        if (empty($sbox0)) {
+            $sbox0 = array(
+                0x52, 0x09, 0x6A, 0xD5, 0x30, 0x36, 0xA5, 0x38, 0xBF, 0x40, 
0xA3, 0x9E, 0x81, 0xF3, 0xD7, 0xFB,
+                0x7C, 0xE3, 0x39, 0x82, 0x9B, 0x2F, 0xFF, 0x87, 0x34, 0x8E, 
0x43, 0x44, 0xC4, 0xDE, 0xE9, 0xCB,
+                0x54, 0x7B, 0x94, 0x32, 0xA6, 0xC2, 0x23, 0x3D, 0xEE, 0x4C, 
0x95, 0x0B, 0x42, 0xFA, 0xC3, 0x4E,
+                0x08, 0x2E, 0xA1, 0x66, 0x28, 0xD9, 0x24, 0xB2, 0x76, 0x5B, 
0xA2, 0x49, 0x6D, 0x8B, 0xD1, 0x25,
+                0x72, 0xF8, 0xF6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xD4, 0xA4, 
0x5C, 0xCC, 0x5D, 0x65, 0xB6, 0x92,
+                0x6C, 0x70, 0x48, 0x50, 0xFD, 0xED, 0xB9, 0xDA, 0x5E, 0x15, 
0x46, 0x57, 0xA7, 0x8D, 0x9D, 0x84,
+                0x90, 0xD8, 0xAB, 0x00, 0x8C, 0xBC, 0xD3, 0x0A, 0xF7, 0xE4, 
0x58, 0x05, 0xB8, 0xB3, 0x45, 0x06,
+                0xD0, 0x2C, 0x1E, 0x8F, 0xCA, 0x3F, 0x0F, 0x02, 0xC1, 0xAF, 
0xBD, 0x03, 0x01, 0x13, 0x8A, 0x6B,
+                0x3A, 0x91, 0x11, 0x41, 0x4F, 0x67, 0xDC, 0xEA, 0x97, 0xF2, 
0xCF, 0xCE, 0xF0, 0xB4, 0xE6, 0x73,
+                0x96, 0xAC, 0x74, 0x22, 0xE7, 0xAD, 0x35, 0x85, 0xE2, 0xF9, 
0x37, 0xE8, 0x1C, 0x75, 0xDF, 0x6E,
+                0x47, 0xF1, 0x1A, 0x71, 0x1D, 0x29, 0xC5, 0x89, 0x6F, 0xB7, 
0x62, 0x0E, 0xAA, 0x18, 0xBE, 0x1B,
+                0xFC, 0x56, 0x3E, 0x4B, 0xC6, 0xD2, 0x79, 0x20, 0x9A, 0xDB, 
0xC0, 0xFE, 0x78, 0xCD, 0x5A, 0xF4,
+                0x1F, 0xDD, 0xA8, 0x33, 0x88, 0x07, 0xC7, 0x31, 0xB1, 0x12, 
0x10, 0x59, 0x27, 0x80, 0xEC, 0x5F,
+                0x60, 0x51, 0x7F, 0xA9, 0x19, 0xB5, 0x4A, 0x0D, 0x2D, 0xE5, 
0x7A, 0x9F, 0x93, 0xC9, 0x9C, 0xEF,
+                0xA0, 0xE0, 0x3B, 0x4D, 0xAE, 0x2A, 0xF5, 0xB0, 0xC8, 0xEB, 
0xBB, 0x3C, 0x83, 0x53, 0x99, 0x61,
+                0x17, 0x2B, 0x04, 0x7E, 0xBA, 0x77, 0xD6, 0x26, 0xE1, 0x69, 
0x14, 0x63, 0x55, 0x21, 0x0C, 0x7D
+            );
+
+            $sbox1 = array();
+            $sbox2 = array();
+            $sbox3 = array();
+
+            for ($i = 0; $i < 256; $i++) {
+                $sbox1[$i <<  8] = $sbox0[$i] <<  8;
+                $sbox2[$i << 16] = $sbox0[$i] << 16;
+                $sbox3[$i << 24] = $sbox0[$i] << 24;
+            }
+        }
+
+        return $sbox0[$word & 0x000000FF] | 
+               $sbox1[$word & 0x0000FF00] | 
+               $sbox2[$word & 0x00FF0000] | 
+               $sbox3[$word & 0xFF000000];
+    }
+
+    /**
+     * Pad "packets".
+     *
+     * Rijndael works by encrypting between sixteen and thirty-two bytes at a 
time, provided that number is also a multiple
+     * of four.  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 Crypt_Rijndael::disablePadding()
+     * @access public
+     */
+    function enablePadding()
+    {
+        $this->padding = true;
+    }
+
+    /**
+     * Do not pad packets.
+     *
+     * @see Crypt_Rijndael::enablePadding()
+     * @access public
+     */
+    function disablePadding()
+    {
+        $this->padding = false;
+    }
+
+    /**
+     * Pads a string
+     *
+     * Pads a string using the RSA PKCS padding standards so that its length 
is a multiple of the blocksize.
+     * $block_size - (strlen($text) % $block_size) bytes are added, each of 
which is equal to 
+     * chr($block_size - (strlen($text) % $block_size)
+     *
+     * If padding is disabled and $text is not a multiple of the blocksize, 
the string will be padded regardless
+     * and padding will, hence forth, be enabled.
+     *
+     * @see Crypt_Rijndael::_unpad()
+     * @access private
+     */
+    function _pad($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})", E_USER_NOTICE);
+                $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 Crypt_Rijndael::_pad()
+     * @access private
+     */
+    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);
+    }
+
+    /**
+     * 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 $rijndael->decrypt($des->encrypt(substr($plaintext, 16, 16)));
+     * </code>
+     * <code>
+     *    echo $rijndael->decrypt($des->encrypt(substr($plaintext, 16, 16)));
+     * </code>
+     *
+     * With the continuous buffer disabled, these would yield the same output. 
 With it enabled, they yield different
+     * outputs.  The reason is due to the fact that the initialization 
vector's change after every encryption /
+     * decryption round when the continuous buffer is enabled.  When it's 
disabled, they remain constant.
+     *
+     * Put another way, when the continuous buffer is enabled, the state of 
the Crypt_Rijndael() 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_Rijndael::disableContinuousBuffer()
+     * @access public
+     */
+    function enableContinuousBuffer()
+    {
+        $this->continuousBuffer = true;
+    }
+
+    /**
+     * Treat consecutive packets as if they are a discontinuous buffer.
+     *
+     * The default behavior.
+     *
+     * @see Crypt_Rijndael::enableContinuousBuffer()
+     * @access public
+     */
+    function disableContinuousBuffer()
+    {
+        $this->continuousBuffer = false;
+        $this->encryptIV = $this->iv;
+        $this->decryptIV = $this->iv;
+    }
+
+    /**
+     * 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;
+    }
+}
+
+// vim: ts=4:sw=4:et:
+// vim6: fdl=1:
\ No newline at end of file


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