/** * Default Constructor. * * Determines whether or not the mcrypt extension should be used. * * $mode could be: * * - CRYPT_DES_MODE_ECB * * - CRYPT_DES_MODE_CBC * * - CRYPT_DES_MODE_CTR * * - CRYPT_DES_MODE_CFB * * - CRYPT_DES_MODE_OFB * * - CRYPT_DES_MODE_3CBC * * If not explictly set, CRYPT_DES_MODE_CBC will be used. * * @see DES::DES() * @see Base::Base() * @param optional Integer $mode * @access public */ function TripleDES($mode = CRYPT_DES_MODE_CBC) { switch ($mode) { // In case of CRYPT_DES_MODE_3CBC, we init as CRYPT_DES_MODE_CBC // and additional flag us internally as 3CBC case CRYPT_DES_MODE_3CBC: parent::DES(CRYPT_DES_MODE_CBC); $this->mode_3cbc = true; // This three $des'es will do the 3CBC work (if $key > 64bits) $this->des = array(new DES(CRYPT_DES_MODE_CBC), new DES(CRYPT_DES_MODE_CBC), new DES(CRYPT_DES_MODE_CBC)); // we're going to be doing the padding, ourselves, so disable it in the DES objects $this->des[0]->disablePadding(); $this->des[1]->disablePadding(); $this->des[2]->disablePadding(); break; // If not 3CBC, we init as usual // If not 3CBC, we init as usual default: parent::DES($mode); } }