* setKey('abcdefghijklmnop'); * * $size = 10 * 1024; * $plaintext = ''; * for ($i = 0; $i < $size; $i++) { * $plaintext.= 'a'; * } * * echo $aes->decrypt($aes->encrypt($plaintext)); * ?> * * * 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_AES * @author Jim Wigginton * @copyright MMVIII Jim Wigginton * @license http://www.opensource.org/licenses/mit-license.html MIT License * @version $Id: AES.php,v 1.7 2010/02/09 06:10:25 terrafrost Exp $ * @link http://phpseclib.sourceforge.net */ /** * Include Crypt_Rijndael */ if (!class_exists('Crypt_Rijndael')) { require_once 'Rijndael.php'; } /**#@+ * @access public * @see Crypt_AES::encrypt() * @see Crypt_AES::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_AES_MODE_CTR', CRYPT_MODE_CTR); /** * 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_AES_MODE_ECB', CRYPT_MODE_ECB); /** * 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_AES_MODE_CBC', CRYPT_MODE_CBC); /** * Encrypt / decrypt using the Cipher Feedback mode. * * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher_feedback_.28CFB.29 */ define('CRYPT_AES_MODE_CFB', CRYPT_MODE_CFB); /** * Encrypt / decrypt using the Cipher Feedback mode. * * @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Output_feedback_.28OFB.29 */ define('CRYPT_AES_MODE_OFB', CRYPT_MODE_OFB); /**#@-*/ /**#@+ * @access private * @see Crypt_AES::Crypt_AES() */ /** * Toggles the internal implementation */ define('CRYPT_AES_MODE_INTERNAL', CRYPT_MODE_INTERNAL); /** * Toggles the mcrypt implementation */ define('CRYPT_AES_MODE_MCRYPT', CRYPT_MODE_MCRYPT); /**#@-*/ /** * Pure-PHP implementation of AES. * * @author Jim Wigginton * @version 0.1.0 * @access public * @package Crypt_AES */ class Crypt_AES extends Crypt_Rijndael { /** * The namespace used by the cipher for its constants. * * @see Crypt_Base::const_namespace * @var String * @access private */ var $const_namespace = 'AES'; /** * The mcrypt specific name of the cipher * * @see Crypt_Base::cipher_name_mcrypt * @var String * @access private */ var $cipher_name_mcrypt = 'rijndael-128'; /** * Default Constructor. * * Determines whether or not the mcrypt extension should be used. * * $mode could be: * * - CRYPT_AES_MODE_ECB * * - CRYPT_AES_MODE_CBC * * - CRYPT_AES_MODE_CTR * * - CRYPT_AES_MODE_CFB * * - CRYPT_AES_MODE_OFB * * If not explictly set, CRYPT_AES_MODE_CBC will be used. * * @see Crypt_Rijndael::Crypt_Rijndael() * @see Crypt_Base::Crypt_Base() * @param optional Integer $mode * @access public */ function Crypt_AES($mode = CRYPT_AES_MODE_CBC) { parent::Crypt_Rijndael($mode); } /** * Dummy function * * Since Crypt_AES extends Crypt_Rijndael, this function is, technically, available, but it doesn't do anything. * * @see Crypt_Rijndael::setBlockLength() * @access public * @param Integer $length */ function setBlockLength($length) { return; } /** * Setup the CRYPT_MODE_MCRYPT $engine * * Validates all the variables. * * @see Crypt_Base::_setupMcrypt() * @access private */ function _setupMcrypt() { if (!$this->explicit_key_length) { // this just copied from Crypt_Rijndael::_setup() $length = strlen($this->key) >> 2; if ($length > 8) { $length = 8; } else if ($length < 4) { $length = 4; } $this->Nk = $length; $this->key_size = $length << 2; } switch ($this->Nk) { case 4: // 128 $this->key_size = 16; break; case 5: // 160 case 6: // 192 $this->key_size = 24; break; case 7: // 224 case 8: // 256 $this->key_size = 32; } $this->password_key_size = $this->key_size; $this->key = str_pad(substr($this->key, 0, $this->key_size), $this->key_size, chr(0)); parent::_setupMcrypt(); } } // vim: ts=4:sw=4:et: // vim6: fdl=1: