<?php

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/**

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* Pure-PHP implementation of AES.

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*

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* Uses mcrypt, if available/possible, and an internal implementation, otherwise.

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*

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* PHP versions 4 and 5

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*

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* If {@link Crypt_AES::setKeyLength() setKeyLength()} isn't called, it'll be calculated from

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* {@link Crypt_AES::setKey() setKey()}. ie. if the key is 128-bits, the key length will be 128-bits. If it's 136-bits

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* it'll be null-padded to 192-bits and 192 bits will be the key length until {@link Crypt_AES::setKey() setKey()}

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* is called, again, at which point, it'll be recalculated.

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*

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* Since Crypt_AES extends Crypt_Rijndael, some functions are available to be called that, in the context of AES, don't

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* make a whole lot of sense. {@link Crypt_AES::setBlockLength() setBlockLength()}, for instance. Calling that function,

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* however possible, won't do anything (AES has a fixed block length whereas Rijndael has a variable one).

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*

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* Here's a short example of how to use this library:

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* <code>

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* <?php

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* include 'Crypt/AES.php';

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*

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* $aes = new Crypt_AES();

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*

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* $aes->setKey('abcdefghijklmnop');

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*

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* $size = 10 * 1024;

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* $plaintext = '';

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* for ($i = 0; $i < $size; $i++) {

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* $plaintext.= 'a';

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* }

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*

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* echo $aes->decrypt($aes->encrypt($plaintext));

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* ?>

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* </code>

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*

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* LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy

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* of this software and associated documentation files (the "Software"), to deal

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* in the Software without restriction, including without limitation the rights

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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

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* copies of the Software, and to permit persons to whom the Software is

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* furnished to do so, subject to the following conditions:

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*

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* The above copyright notice and this permission notice shall be included in

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* all copies or substantial portions of the Software.

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*

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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

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* THE SOFTWARE.

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*

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* @category Crypt

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* @package Crypt_AES

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* @author Jim Wigginton <terrafrost@php.net>

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* @copyright MMVIII Jim Wigginton

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* @license http://www.opensource.org/licenses/mit-license.html MIT License

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* @link http://phpseclib.sourceforge.net

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*/

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/**

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* Include Crypt_Rijndael

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*/

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if (!class_exists('Crypt_Rijndael')) {

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require_once dirname(__FILE__).'/Rijndael.php';

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}

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/**#@+

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* @access public

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* @see Crypt_AES::encrypt()

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* @see Crypt_AES::decrypt()

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*/

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/**

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* Encrypt / decrypt using the Counter mode.

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*

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* Set to -1 since that's what Crypt/Random.php uses to index the CTR mode.

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*

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* @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Counter_.28CTR.29

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*/

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define('CRYPT_AES_MODE_CTR', CRYPT_MODE_CTR);

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/**

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* Encrypt / decrypt using the Electronic Code Book mode.

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*

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* @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Electronic_codebook_.28ECB.29

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*/

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define('CRYPT_AES_MODE_ECB', CRYPT_MODE_ECB);

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/**

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* Encrypt / decrypt using the Code Book Chaining mode.

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*

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* @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher-block_chaining_.28CBC.29

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*/

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define('CRYPT_AES_MODE_CBC', CRYPT_MODE_CBC);

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/**

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* Encrypt / decrypt using the Cipher Feedback mode.

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*

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* @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher_feedback_.28CFB.29

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*/

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define('CRYPT_AES_MODE_CFB', CRYPT_MODE_CFB);

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/**

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* Encrypt / decrypt using the Cipher Feedback mode.

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*

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* @link http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Output_feedback_.28OFB.29

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*/

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define('CRYPT_AES_MODE_OFB', CRYPT_MODE_OFB);

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/**#@-*/

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/**#@+

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* @access private

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* @see Crypt_Base::Crypt_Base()

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*/

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/**

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* Toggles the internal implementation

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*/

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define('CRYPT_AES_MODE_INTERNAL', CRYPT_MODE_INTERNAL);

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/**

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* Toggles the mcrypt implementation

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*/

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define('CRYPT_AES_MODE_MCRYPT', CRYPT_MODE_MCRYPT);

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/**#@-*/

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/**

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* Pure-PHP implementation of AES.

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*

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* @package Crypt_AES

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* @author Jim Wigginton <terrafrost@php.net>

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* @access public

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*/

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class Crypt_AES extends Crypt_Rijndael

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{

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/**

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* The namespace used by the cipher for its constants.

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*

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* @see Crypt_Base::const_namespace

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* @var String

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* @access private

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*/

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public $const_namespace = 'AES';

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/**

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* Dummy function

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*

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* Since Crypt_AES extends Crypt_Rijndael, this function is, technically, available, but it doesn't do anything.

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*

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* @see Crypt_Rijndael::setBlockLength()

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* @access public

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*

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* @param Integer $length

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*/

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public function setBlockLength($length)

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{

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return;

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}

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}

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