--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/web/lib/Zend/InfoCard/Cipher/Symmetric/Adapter/Aes256cbc.php	Fri Mar 11 15:05:35 2011 +0100
@@ -0,0 +1,111 @@
+<?php
+/**
+ * Zend Framework
+ *
+ * LICENSE
+ *
+ * This source file is subject to the new BSD license that is bundled
+ * with this package in the file LICENSE.txt.
+ * It is also available through the world-wide-web at this URL:
+ * http://framework.zend.com/license/new-bsd
+ * If you did not receive a copy of the license and are unable to
+ * obtain it through the world-wide-web, please send an email
+ * to license@zend.com so we can send you a copy immediately.
+ *
+ * @category   Zend
+ * @package    Zend_InfoCard
+ * @subpackage Zend_InfoCard_Cipher
+ * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ * @version    $Id: Aes256cbc.php 20096 2010-01-06 02:05:09Z bkarwin $
+ */
+
+/**
+ * Zend_InfoCard_Cipher_Symmetric_Adapter_Abstract
+ */
+require_once 'Zend/InfoCard/Cipher/Symmetric/Adapter/Abstract.php';
+
+/**
+ * Zend_InfoCard_Cipher_Symmetric_Aes256cbc_Interface
+ */
+require_once 'Zend/InfoCard/Cipher/Symmetric/Aes256cbc/Interface.php';
+
+/**
+ * Implements AES256 with CBC encryption implemented using the mCrypt extension
+ *
+ * @category   Zend
+ * @package    Zend_InfoCard
+ * @subpackage Zend_InfoCard_Cipher
+ * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ */
+class Zend_InfoCard_Cipher_Symmetric_Adapter_Aes256cbc
+    extends Zend_InfoCard_Cipher_Symmetric_Adapter_Abstract
+    implements Zend_InfoCard_Cipher_Symmetric_Aes256cbc_Interface
+{
+    /**
+     * The MCRYPT Cipher constant for this encryption
+     */
+    const MCRYPT_CIPHER = MCRYPT_RIJNDAEL_128;
+
+    /**
+     * The MCRYPT Mode constant for this encryption
+     */
+    const MCRYPT_MODE   = MCRYPT_MODE_CBC;
+
+    /**
+     * The default length of the IV to use
+     */
+    const IV_LENGTH     = 16;
+
+    /**
+     * The object constructor
+     *
+     * @throws Zend_InfoCard_Cipher_Exception
+     */
+    public function __construct()
+    {
+        // Can't test for this
+        // @codeCoverageIgnoreStart
+        if(!extension_loaded('mcrypt')) {
+            require_once 'Zend/InfoCard/Cipher/Exception.php';
+            throw new Zend_InfoCard_Cipher_Exception("Use of the AES256CBC Cipher requires the mcrypt extension");
+        }
+        // @codeCoveregIgnoreEnd
+    }
+
+    /**
+     * Decrypts data using the AES Algorithm using the mCrypt extension
+     *
+     * @throws Zend_InfoCard_Cipher_Exception
+     * @param string $encryptedData The encrypted data in binary format
+     * @param string $decryptionKey The decryption key
+     * @param integer $iv_length The IV length to use
+     * @return string the decrypted data with any terminating nulls removed
+     */
+    public function decrypt($encryptedData, $decryptionKey, $iv_length = null)
+    {
+
+        $iv_length = ($iv_length === null) ? self::IV_LENGTH : $iv_length;
+
+        $mcrypt_iv = null;
+
+        if($iv_length > 0) {
+             $mcrypt_iv = substr($encryptedData, 0, $iv_length);
+            $encryptedData = substr($encryptedData, $iv_length);
+        }
+
+        $decrypted = mcrypt_decrypt(self::MCRYPT_CIPHER, $decryptionKey, $encryptedData, self::MCRYPT_MODE, $mcrypt_iv);
+
+        if(!$decrypted) {
+            require_once 'Zend/InfoCard/Cipher/Exception.php';
+            throw new Zend_InfoCard_Cipher_Exception("Failed to decrypt data using AES256CBC Algorithm");
+        }
+
+        $decryptedLength = strlen($decrypted);
+        $paddingLength = substr($decrypted, $decryptedLength -1, 1);
+        $decrypted = substr($decrypted, 0, $decryptedLength - ord($paddingLength));
+
+        return rtrim($decrypted, "\0");
+    }
+}