src/Biz/Util/Phpsec/Crypt/TripleDES.php

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<?php

/**
 * Pure-PHP implementation of Triple DES.
 *
 * Uses mcrypt, if available, and an internal implementation, otherwise.  Operates in the EDE3 mode (encrypt-decrypt-encrypt).
 *
 * PHP version 5
 *
 * Here's a short example of how to use this library:
 * <code>
 * <?php
 *    include 'vendor/autoload.php';
 *
 *    $des = new \Biz\Util\Phpsec\Crypt\TripleDES();
 *
 *    $des->setKey('abcdefghijklmnopqrstuvwx');
 *
 *    $size = 10 * 1024;
 *    $plaintext = '';
 *    for ($i = 0; $i < $size; $i++) {
 *        $plaintext.= 'a';
 *    }
 *
 *    echo $des->decrypt($des->encrypt($plaintext));
 * ?>
 * </code>
 *
 * @category  Crypt
 *
 * @author    Jim Wigginton <terrafrost@php.net>
 * @copyright 2007 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 *
 * @see      http://phpseclib.sourceforge.net
 */

namespace Biz\Util\Phpsec\Crypt;

/**
 * Pure-PHP implementation of Triple DES.
 *
 *
 * @author  Jim Wigginton <terrafrost@php.net>
 */
class TripleDES extends DES
{
    /**
     * Encrypt / decrypt using inner chaining.
     *
     * Inner chaining is used by SSH-1 and is generally considered to be less secure then outer chaining (self::MODE_CBC3).
     */
    const MODE_3CBC = -2;

    /**
     * Encrypt / decrypt using outer chaining.
     *
     * Outer chaining is used by SSH-2 and when the mode is set to \Biz\Util\Phpsec\Crypt\Base::MODE_CBC.
     */
    const MODE_CBC3 = Base::MODE_CBC;