public function identifiesPKC(Certificate $cert): bool
    {
        $tbs = $cert->tbsCertificate();
        if (!$tbs->issuer()->equals($this->_issuer->firstDN())) {
            return false;
        }
        if (strval($tbs->serialNumber()) != strval($this->_serial)) {
            return false;
        }
        if ($this->_issuerUID && !$this->_checkUniqueID($cert)) {
            return false;
        }
        return true;
    }