function getRevokedCertificateExtension($serial, $id, $crl = NULL)
    {
        if (!isset($crl)) {
            $crl = $this->currentCert;
        }

        if (is_array($rclist = $this->_subArray($crl, 'tbsCertList/revokedCertificates'))) {
            if (($i = $this->_revokedCertificate($rclist, $serial)) !== false) {
                return $this->_getExtension($id, $crl,  "tbsCertList/revokedCertificates/$i/crlEntryExtensions");
            }
        }

        return false;
    }