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Adds phpseclib 0.3.9.
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‎tools/phpseclib0.3.9/Crypt/AES.php

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<?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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include_once '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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var $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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* @param Integer $length
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*/
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function setBlockLength($length)
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{
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return;
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}
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/**
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* Sets the key length
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*
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* Valid key lengths are 128, 192, and 256. If the length is less than 128, it will be rounded up to
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* 128. If the length is greater than 128 and invalid, it will be rounded down to the closest valid amount.
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*
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* @see Crypt_Rijndael:setKeyLength()
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* @access public
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* @param Integer $length
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*/
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function setKeyLength($length)
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{
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switch ($length) {
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case 160:
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$length = 192;
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break;
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case 224:
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$length = 256;
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}
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parent::setKeyLength($length);
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}
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/**
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* Sets the key.
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*
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* Rijndael supports five different key lengths, AES only supports three.
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*
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* @see Crypt_Rijndael:setKey()
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* @see setKeyLength()
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* @access public
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* @param String $key
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*/
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function setKey($key)
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{
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parent::setKey($key);
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if (!$this->explicit_key_length) {
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$length = strlen($key);
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switch (true) {
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case $length <= 16:
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$this->key_size = 16;
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break;
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case $length <= 24:
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$this->key_size = 24;
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break;
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default:
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$this->key_size = 32;
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}
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$this->_setupEngine();
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}
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}
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}

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