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<?php /** * Pure-PHP implementation of AES. * * Uses mcrypt, if available/possible, and an internal implementation, otherwise. * * PHP versions 4 and 5 * * NOTE: Since AES.php is (for compatibility and phpseclib-historical reasons) virtually * just a wrapper to Rijndael.php you may consider using Rijndael.php instead of * to save one include_once(). * * If {@link self::setKeyLength() setKeyLength()} isn't called, it'll be calculated from * {@link self::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 192-bits and 192 bits will be the key length until {@link self::setKey() setKey()} * is called, again, at which point, it'll be recalculated. * * Since Crypt_AES extends Crypt_Rijndael, some functions are available to be called that, in the context of AES, don't * make a whole lot of sense. {@link self::setBlockLength() setBlockLength()}, for instance. Calling that function, * however possible, won't do anything (AES has a fixed block length whereas Rijndael has a variable one). * * Here's a short example of how to use this library: * <code> * <?php * include 'Crypt/AES.php'; * * $aes = new Crypt_AES(); * * $aes->setKey('abcdefghijklmnop'); * * $size = 10 * 1024; * $plaintext = ''; * for ($i = 0; $i < $size; $i++) { * $plaintext.= 'a'; * } * * echo $aes->decrypt($aes->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_AES * @author Jim Wigginton <terrafrost@php.net> * @copyright 2008 Jim Wigginton * @license http://www.opensource.org/licenses/mit-license.html MIT License * @link http://phpseclib.sourceforge.net */ /** * Include Crypt_Rijndael */ if (!class_exists('Crypt_Rijndael')) { include_once 'Rijndael.php'; } /**#@+ * @access public * @see self::encrypt() * @see self::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); /**#@-*/ /** * Pure-PHP implementation of AES. * * @package Crypt_AES * @author Jim Wigginton <terrafrost@php.net> * @access public */ 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'; /** * 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 int $length */ function setBlockLength($length) { return; } /** * Sets the key length * * Valid key lengths are 128, 192, and 256. If the length is less than 128, it will be rounded up to * 128. If the length is greater than 128 and invalid, it will be rounded down to the closest valid amount. * * @see Crypt_Rijndael:setKeyLength() * @access public * @param int $length */ function setKeyLength($length) { parent::setKeyLength($length); switch ($this->key_length) { case 20: $this->key_length = 24; break; case 28: $this->key_length = 32; } } }
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