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Direktori : /home2/selectio/www/3-idiots/vendor/phpseclib/phpseclib/phpseclib/Crypt/ |
Current File : //home2/selectio/www/3-idiots/vendor/phpseclib/phpseclib/phpseclib/Crypt/AES.php |
<?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 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 \phpseclib3\Crypt\AES extends \phpseclib3\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 'vendor/autoload.php'; * * $aes = new \phpseclib3\Crypt\AES('ctr'); * * $aes->setKey('abcdefghijklmnop'); * * $size = 10 * 1024; * $plaintext = ''; * for ($i = 0; $i < $size; $i++) { * $plaintext.= 'a'; * } * * echo $aes->decrypt($aes->encrypt($plaintext)); * ?> * </code> * * @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 */ namespace phpseclib3\Crypt; /** * Pure-PHP implementation of AES. * * @author Jim Wigginton <terrafrost@php.net> */ class AES extends Rijndael { /** * Dummy function * * Since \phpseclib3\Crypt\AES extends \phpseclib3\Crypt\Rijndael, this function is, technically, available, but it doesn't do anything. * * @see \phpseclib3\Crypt\Rijndael::setBlockLength() * @param int $length * @throws \BadMethodCallException anytime it's called */ public function setBlockLength($length) { throw new \BadMethodCallException('The block length cannot be set for AES.'); } /** * Sets the key length * * Valid key lengths are 128, 192, and 256. Set the link to bool(false) to disable a fixed key length * * @see \phpseclib3\Crypt\Rijndael:setKeyLength() * @param int $length * @throws \LengthException if the key length isn't supported */ public function setKeyLength($length) { switch ($length) { case 128: case 192: case 256: break; default: throw new \LengthException('Key of size ' . $length . ' not supported by this algorithm. Only keys of sizes 128, 192 or 256 supported'); } parent::setKeyLength($length); } /** * Sets the key. * * Rijndael supports five different key lengths, AES only supports three. * * @see \phpseclib3\Crypt\Rijndael:setKey() * @see setKeyLength() * @param string $key * @throws \LengthException if the key length isn't supported */ public function setKey($key) { switch (strlen($key)) { case 16: case 24: case 32: break; default: throw new \LengthException('Key of size ' . strlen($key) . ' not supported by this algorithm. Only keys of sizes 16, 24 or 32 supported'); } parent::setKey($key); } }