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<?php /** * Pure-PHP implementation of AES. * * Uses mcrypt, if available/possible, and an internal implementation, otherwise. * * PHP version 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 \phpseclib\Crypt\AES::setKeyLength() setKeyLength()} isn't called, it'll be calculated from * {@link \phpseclib\Crypt\AES::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 \phpseclib\Crypt\AES::setKey() setKey()} * is called, again, at which point, it'll be recalculated. * * Since \phpseclib\Crypt\AES extends \phpseclib\Crypt\Rijndael, some functions are available to be called that, in the context of AES, don't * make a whole lot of sense. {@link \phpseclib\Crypt\AES::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 'vendor/autoload.php'; * * $aes = new \phpseclib\Crypt\AES(); * * $aes->setKey('abcdefghijklmnop'); * * $size = 10 * 1024; * $plaintext = ''; * for ($i = 0; $i < $size; $i++) { * $plaintext.= 'a'; * } * * echo $aes->decrypt($aes->encrypt($plaintext)); * ?> * </code> * * @category Crypt * @package AES * @author Jim Wigginton <[email protected]> * @copyright 2008 Jim Wigginton * @license http://www.opensource.org/licenses/mit-license.html MIT License * @link http://phpseclib.sourceforge.net */ namespace phpseclib\Crypt; defined("ABSPATH") or die(""); use phpseclib\Crypt\Rijndael; /** * Pure-PHP implementation of AES. * * @package AES * @author Jim Wigginton <[email protected]> * @access public */ class AES extends Rijndael { /** * Dummy function * * Since \phpseclib\Crypt\AES extends \phpseclib\Crypt\Rijndael, this function is, technically, available, but it doesn't do anything. * * @see \phpseclib\Crypt\Rijndael::setBlockLength() * @access public * @param Integer $length */ function setBlockLength($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 \phpseclib\Crypt\Rijndael:setKeyLength() * @access public * @param Integer $length */ function setKeyLength($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 \phpseclib\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_size = 16; break; case $length <= 24: $this->key_size = 24; break; default: $this->key_size = 32; } $this->_setEngine(); } } }