CLASS_CRYPT::get_key PHP Method

    private function get_key($string, $key_priv)
    {
        $_str_key = md5($this->key_pub . $key_priv);
        $_ctr = 0;
        $_str_return = "";
        for ($_iii = 0; $_iii < strlen($string); $_iii++) {
            $_ctr = $_ctr == strlen($_str_key) ? 0 : $_ctr;
            $_str_return .= $string[$_iii] ^ $_str_key[$_ctr++];
        }
        return $_str_return;
    }