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#pma/libraries/phpseclib/Crypt/AES.php

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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 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 \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 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 \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 <terrafrost@php.net>
+ * @copyright 2008 Jim Wigginton
+ * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @link      http://phpseclib.sourceforge.net
+ */
+namespace phpseclib\Crypt;
+
+if (! defined('PHPMYADMIN')) {
+    exit;
+}
+
+use phpseclib\Crypt\Rijndael;
+
+/**
+ * Pure-PHP implementation of AES.
+ *
+ * @package AES
+ * @author  Jim Wigginton <terrafrost@php.net>
+ * @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 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 \phpseclib\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 \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_length = 16;
+                    break;
+                case $length <= 24:
+                    $this->key_length = 24;
+                    break;
+                default:
+                    $this->key_length = 32;
+            }
+            $this->_setEngine();
+        }
+    }
+}