public function validate_server_token($token)
 {
     return lftokenValidateServerToken($token, $this->get_key());
 }
function lftokenValidateResponse($data, $response, $key)
{
    // This was a poorly chosen name, not a great interface.
    // Deprecated but here for backcompat
    return lftokenValidateServerToken($data . ',' . $response, $key);
}