diff options
Diffstat (limited to 'libs/phpseclib-1.0.6/Crypt/AES.php')
| -rw-r--r-- | libs/phpseclib-1.0.6/Crypt/AES.php | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/libs/phpseclib-1.0.6/Crypt/AES.php b/libs/phpseclib-1.0.6/Crypt/AES.php new file mode 100644 index 0000000..594011e --- /dev/null +++ b/libs/phpseclib-1.0.6/Crypt/AES.php @@ -0,0 +1,197 @@ +<?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) + { + switch ($length) { + case 160: + $length = 192; + break; + case 224: + $length = 256; + } + parent::setKeyLength($length); + } + + /** + * Sets the key. + * + * Rijndael supports five different key lengths, AES only supports three. + * + * @see Crypt_Rijndael:setKey() + * @see setKeyLength() + * @access public + * @param string $key + */ + function setKey($key) + { + parent::setKey($key); + + if (!$this->explicit_key_length) { + $length = strlen($key); + switch (true) { + case $length <= 16: + $this->key_length = 16; + break; + case $length <= 24: + $this->key_length = 24; + break; + default: + $this->key_length = 32; + } + $this->_setEngine(); + } + } +} |