* setKey('abcdefgh'); * * $plaintext = str_repeat('a', 1024); * * echo $rc2->decrypt($rc2->encrypt($plaintext)); * ?> * * * @category Crypt * @package RC2 * @author Patrick Monnerat * @license http://www.opensource.org/licenses/mit-license.html MIT License * @link http://phpseclib.sourceforge.net */ namespace phpseclib\Crypt; /** * Pure-PHP implementation of RC2. * * @package RC2 * @author Jim Wigginton * @access public */ class RC2 extends Base { /** * Default Constructor. * * Determines whether or not the mcrypt extension should be used. * * $mode could be: * * - self::MODE_ECB * * - self::MODE_CBC * * - self::MODE_CTR * * - self::MODE_CFB * * - self::MODE_OFB * * If not explicitly set, self::MODE_CBC will be used. * * @param int $mode * @access public */ public function __construct($mode = self::MODE_CBC) { parent::__construct($mode); $this->key_length = 8; } /** * 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 < 8: return 8; case $length > 1024: return 1024; } return $length; } /** * Setup IV and key */ protected function setup() { if ($this->explicit_key_length) { $this->cipher->setKeyLength($this->key_length); } $this->cipher->setKey($this->key); if (!$this->ivSet) { $this->setIV(''); } $this->changed = false; } /** * Sets the key. * * Keys can be of any length. RC2, itself, uses 8 to 1024 bit keys (eg. * strlen($key) <= 128), however, we only use the first 128 bytes if $key * has more then 128 bytes in it, and set $key to a single null byte if * it is empty. * * If the key is not explicitly set, it'll be assumed to be a single * null byte. * * @see \phpseclib\Crypt\Base::setKey() * @access public * @param string $key * @param int $t1 optional Effective key length in bits. */ function setKey($key, $t1 = 0) { parent::setKey($key); if ($t1) { $this->setKeyLength($t1); } } }