X509CertificateHolder holder = new X509CertificateHolder(issuer.getEncoded());
CertificateID certificateID = new CertificateID(provider.get(CertificateID.HASH_SHA1), holder, certificate.getSerialNumber());
BigInteger nonce = BigInteger.valueOf(System.currentTimeMillis());
builder.addRequest(certificateID);
ExtensionsGenerator extensionsGenerator = new ExtensionsGenerator();
extensionsGenerator.addExtension(OCSPObjectIdentifiers.id_pkix_ocsp_nonce, false, new DEROctetString(nonce.toByteArray()));
return builder.build();
}