[dev-crypto-csharp] PROBLEM WITH generation of PKCS10CertificateRequest with EC key pair

[Uzeyir Qurbanli]

Hi, Can anybody help me to solve this problem, or may be anyone encountered
this error:

I need to create *PKCS10* request with *EC keypairs*. But there is an error
with request public key every time, I use BC sample test codes for testing
below too:
X9ECParameters x9 = ECNamedCurveTable.GetByName("secp521r1");
            ECCurve curve = x9.Curve;
            ECDomainParameters spec = new ECDomainParameters(curve, x9.G,
x9.N, x9.H);

            ECPrivateKeyParameters privKey = new ECPrivateKeyParameters(
                new
BigInteger("5769183828869504557786041598510887460263120754767955773309066354712783118202294874205844512909370791582896372147797293913785865682804434049019366394746072023"),
// d
                spec);

            ECPublicKeyParameters pubKey = new ECPublicKeyParameters(
                //
curve.DecodePoint(Hex.Decode("026BFDD2C9278B63C92D6624F151C9D7A822CC75BD983B17D25D74C26740380022D3D8FAF304781E416175EADF4ED6E2B47142D2454A7AC7801DD803CF44A4D1F0AC")),
// Q

curve.DecodePoint(Hex.Decode("02006BFDD2C9278B63C92D6624F151C9D7A822CC75BD983B17D25D74C26740380022D3D8FAF304781E416175EADF4ED6E2B47142D2454A7AC7801DD803CF44A4D1F0AC")),
// Q
                spec);

            Pkcs10CertificationRequest req = new Pkcs10CertificationRequest(
                algorithm, new X509Name("CN=XXX"), pubKey, null, privKey);
            if (!req.Verify())
            {
                //Fail("Failed Verify check EC.");
            }

But when i save the PKCS10request as Base64string and open with certutil i
encountered such error:

"Signature does not match Public key: 8009310b
Cannot decode object: ASN1 bad tag value met. 0x8009310b (ASN: 267)
CertUtil: -dump command FAILED: 0x8009310b (ASN: 267)
CertUtil: ASN1 bad tag value met."

And the lenght of public key is 0

"Public Key Length: 0 bits"
With RSA key pair there was not such problem.
May be anyone has encountered such error? Thanks in advance!
-- 

Best regards

******************
Uzeyir G. Gurbanly
Mobile: +994 55 6503505
Mail: uzey...@gmail.com