Description

When creating a Cng ECDSA private key in the TPM Cng and using CertificateRequest to generate a self signed certificate.

The implementation calls ECDsaCertificateExtensions.CopyWithPrivateKey which call Helpers.AreSamePublicECParameters(publicKey.ExportParameters(false), privateKey.ExportParameters(false))).
Unfortunately privateKey.ExportParameters returns a structure where the ECParameters.Curve.Oid.Value is not set.
That breaks AreSamePublicECParameters which returns false and raise an exception in CopyWithPrivateKey.

System.ArgumentException: The provided key does not match the public key for this certificate. (Parameter 'privateKey')
at System.Security.Cryptography.X509Certificates.ECDsaCertificateExtensions.CopyWithPrivateKey(X509Certificate2 certificate, ECDsa privateKey)
at System.Security.Cryptography.X509Certificates.CertificateRequest.CreateSelfSigned(DateTimeOffset notBefore, DateTimeOffset notAfter)

Reproduction Steps

        CngKeyCreationParameters keyParams = new()
        {
            Provider = new CngProvider("Microsoft Platform Crypto Provider"),
        };
        CngKey key = CngKey.Create(CngAlgorithm.ECDsaP384, "KeyInTPM", keyParams);
        ECDsaCng cngkey = new ECDsaCng(key);
        CertificateRequest request = new(
                subjectName,
                cngkey ,
                HashAlgorithmName.SHA256);
        X509Certificate2 selfSigned = request.CreateSelfSigned(DateTimeOffset.UtcNow, DateTimeOffset.UtcNow);

Expected behavior

No exception.

Actual behavior

Exception

Regression?

No response

Known Workarounds

No know workaround

Configuration

Bug occurs on:
Windows 10 Pro wich Visual Studio 2022 and .net 5.0.
Windows 10 Pro wich Visual Studio 2022 and .net 6.0.

Other information

No response