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127 lines
3.6 KiB
PHP
127 lines
3.6 KiB
PHP
<?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 version 5
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*
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* NOTE: Since AES.php is (for compatibility and phpseclib-historical reasons) virtually
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* just a wrapper to Rijndael.php you may consider using Rijndael.php instead of
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* to save one include_once().
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*
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* If {@link self::setKeyLength() setKeyLength()} isn't called, it'll be calculated from
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* {@link self::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 self::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 \phpseclib\Crypt\AES extends \phpseclib\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 self::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 'vendor/autoload.php';
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*
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* $aes = new \phpseclib\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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* @category Crypt
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* @package AES
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* @author Jim Wigginton <terrafrost@php.net>
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* @copyright 2008 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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namespace phpseclib\Crypt;
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/**
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* Pure-PHP implementation of AES.
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*
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* @package 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 AES extends Rijndael
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{
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/**
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* Dummy function
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*
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* Since \phpseclib\Crypt\AES extends \phpseclib\Crypt\Rijndael, this function is, technically, available, but it doesn't do anything.
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*
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* @see \phpseclib\Crypt\Rijndael::setBlockLength()
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* @access public
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* @param int $length
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*/
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function setBlockLength($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 \phpseclib\Crypt\Rijndael:setKeyLength()
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* @access public
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* @param int $length
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*/
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function setKeyLength($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 \phpseclib\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_length = 16;
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break;
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case $length <= 24:
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$this->key_length = 24;
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break;
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default:
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$this->key_length = 32;
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}
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$this->_setEngine();
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}
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}
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}
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