OpenSSL::OCSP::CertificateId#serial

static VALUE
ossl_ocspcid_get_serial(VALUE self)
{
    OCSP_CERTID *id;
    ASN1_INTEGER *serial;

    GetOCSPCertId(self, id);
    OCSP_id_get0_info(NULL, NULL, NULL, &serial, id);

    return asn1integer_to_num(serial);
}