oids.addElement(OCSPObjectIdentifiers.id_pkix_ocsp_nonce);
values.addElement(new X509Extension(false, new DEROctetString(new DEROctetString(sampleNonce))));
gen.setRequestExtensions(new X509Extensions(oids, values));
gen.addRequest(
new CertificateID(CertificateID.HASH_SHA1, testCert, BigInteger.valueOf(1)));
chain[0] = testCert;
req = gen.generate("SHA1withECDSA", signKP.getPrivate(), chain, "BC");