/InfoCard/Cipher/Symmetric/Adapter/Aes256cbc.php
PHP | 111 lines | 36 code | 14 blank | 61 comment | 3 complexity | 1b1e535945c0b1b5b5da87d860276901 MD5 | raw file
- <?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) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
- * @license http://framework.zend.com/license/new-bsd New BSD License
- * @version $Id: Aes256cbc.php 24593 2012-01-05 20:35:02Z matthew $
- */
- /**
- * 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) 2005-2012 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");
- }
- }