* setKey('abcdefghijklmnopqrstuvwx'); * * $size = 10 * 1024; * $plaintext = ''; * for ($i = 0; $i < $size; $i++) { * $plaintext.= 'a'; * } * * echo $des->decrypt($des->encrypt($plaintext)); * ?> * * * @category Crypt * @package TripleDES * @author Jim Wigginton * @copyright 2007 Jim Wigginton * @license http://www.opensource.org/licenses/mit-license.html MIT License * @link http://phpseclib.sourceforge.net */ namespace phpseclib\Crypt; /** * Pure-PHP implementation of Triple DES. * * @package TripleDES * @author Jim Wigginton * @access public */ class TripleDES extends Base { /** * 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 \phpseclib\Crypt\Base::MODE_CBC. */ const MODE_CBC3 = Base::MODE_CBC; /** * Default Constructor. * * Determines whether or not the mcrypt extension should be used. * * $mode could be: * * - \phpseclib\Crypt\Base::MODE_ECB * * - \phpseclib\Crypt\Base::MODE_CBC * * - \phpseclib\Crypt\Base::MODE_CTR * * - \phpseclib\Crypt\Base::MODE_CFB * * - \phpseclib\Crypt\Base::MODE_OFB * * - \phpseclib\Crypt\TripleDES::MODE_3CBC * * If not explicitly set, \phpseclib\Crypt\Base::MODE_CBC will be used. * * @see \phpseclib\Crypt\DES::__construct() * @see \phpseclib\Crypt\Base::__construct() * @param int $mode * @access public */ public function __construct($mode = self::MODE_CBC) { if ($mode == self::MODE_3CBC) { $this->cipher = new \phpseclib3\Crypt\TripleDES('3cbc'); $this->key_length = $this->cipher->getKeyLength(); return; } parent::__construct($mode); } /** * Turns key lengths, be they valid or invalid, to valid key lengths * * @param int $length * @access private * @return int */ protected function calculateNewKeyLength($length) { switch (true) { case $length <= 64: return 64; case $length <= 128: return 128; default: return 192; } } }