/**
  * @see AbstractKeyInstance::serializeToObject($obj)
  */
 protected function serializeToObject(&$obj)
 {
     $obj["p"] = $this->key_p->toHex();
     $obj["q"] = $this->key_q->toHex();
     $obj["g"] = $this->key_g->toHex();
     $obj["y"] = $this->key_y->toHex();
 }