115 lines
3.6 KiB
PHP
115 lines
3.6 KiB
PHP
<?php
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/**
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* Zend Framework
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*
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* LICENSE
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*
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* This source file is subject to the new BSD license that is bundled
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* with this package in the file LICENSE.txt.
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* It is also available through the world-wide-web at this URL:
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* http://framework.zend.com/license/new-bsd
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* If you did not receive a copy of the license and are unable to
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* obtain it through the world-wide-web, please send an email
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* to license@zend.com so we can send you a copy immediately.
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*
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* @category Zend
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* @package Zend_InfoCard
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* @subpackage Zend_InfoCard_Cipher
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* @copyright Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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* @version $Id: Aes256cbc.php 9094 2008-03-30 18:36:55Z thomas $
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*/
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/**
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* Zend_InfoCard_Cipher_Symmetric_Adapter_Abstract
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*/
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require_once 'Zend/InfoCard/Cipher/Symmetric/Adapter/Abstract.php';
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/**
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* Zend_InfoCard_Cipher_Symmetric_Aes256cbc_Interface
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*/
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require_once 'Zend/InfoCard/Cipher/Symmetric/Aes256cbc/Interface.php';
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/**
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* Zend_InfoCard_Cipher_Exception
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*/
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require_once 'Zend/InfoCard/Cipher/Exception.php';
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/**
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* Implements AES256 with CBC encryption implemented using the mCrypt extension
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*
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* @category Zend
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* @package Zend_InfoCard
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* @subpackage Zend_InfoCard_Cipher
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* @copyright Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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*/
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class Zend_InfoCard_Cipher_Symmetric_Adapter_Aes256cbc
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extends Zend_InfoCard_Cipher_Symmetric_Adapter_Abstract
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implements Zend_InfoCard_Cipher_Symmetric_Aes256cbc_Interface
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{
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/**
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* The MCRYPT Cipher constant for this encryption
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*/
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const MCRYPT_CIPHER = MCRYPT_RIJNDAEL_128;
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/**
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* The MCRYPT Mode constant for this encryption
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*/
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const MCRYPT_MODE = MCRYPT_MODE_CBC;
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/**
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* The default length of the IV to use
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*/
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const IV_LENGTH = 16;
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/**
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* The object constructor
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*
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* @throws Zend_InfoCard_Cipher_Exception
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*/
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public function __construct()
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{
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// Can't test for this
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// @codeCoverageIgnoreStart
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if(!extension_loaded('mcrypt')) {
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throw new Zend_InfoCard_Cipher_Exception("Use of the AES256CBC Cipher requires the mcrypt extension");
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}
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// @codeCoveregIgnoreEnd
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}
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/**
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* Decrypts data using the AES Algorithm using the mCrypt extension
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*
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* @throws Zend_InfoCard_Cipher_Exception
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* @param string $encryptedData The encrypted data in binary format
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* @param string $decryptionKey The decryption key
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* @param integer $iv_length The IV length to use
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* @return string the decrypted data with any terminating nulls removed
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*/
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public function decrypt($encryptedData, $decryptionKey, $iv_length = null)
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{
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$iv_length = is_null($iv_length) ? self::IV_LENGTH : $iv_length;
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$mcrypt_iv = null;
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if($iv_length > 0) {
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$mcrypt_iv = substr($encryptedData, 0, $iv_length);
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$encryptedData = substr($encryptedData, $iv_length);
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}
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$decrypted = mcrypt_decrypt(self::MCRYPT_CIPHER, $decryptionKey, $encryptedData, self::MCRYPT_MODE, $mcrypt_iv);
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if(!$decrypted) {
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throw new Zend_InfoCard_Cipher_Exception("Failed to decrypt data using AES256CBC Algorithm");
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}
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$decryptedLength = strlen($decrypted);
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$paddingLength = substr($decrypted, $decryptedLength -1, 1);
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$decrypted = substr($decrypted, 0, $decryptedLength - ord($paddingLength));
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return rtrim($decrypted, "\0");
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}
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}
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