NamedCurveOID: oid,
		PublicKey:     asn1.BitString{Bytes: elliptic.Marshal(key.Curve, key.X, key.Y)},
	})
}

// marshalECDHPrivateKey marshals an EC private key into ASN.1, DER format
// suitable for NIST curves.
func marshalECDHPrivateKey(key *ecdh.PrivateKey) ([]byte, error) {
	return asn1.Marshal(ecPrivateKey{
		Version:    1,
		PrivateKey: key.Bytes(),

			}
			privKey.Algo = pkix.AlgorithmIdentifier{
				Algorithm: oidPublicKeyECDSA,
				Parameters: asn1.RawValue{
					FullBytes: oidBytes,
				},
			}
			if privKey.PrivateKey, err = marshalECDHPrivateKey(k); err != nil {
				return nil, errors.New("x509: failed to marshal EC private key while building PKCS#8: " + err.Error())
			}
		}

	default: