I have some Go code to generate an ECDSA key and write it to a file:
priv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
ecder, err := x509.MarshalECPrivateKey(priv)
keypem, err := os.OpenFile("ec-key.pem", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
pem.Encode(keypem, &pem.Block{Type: "EC PRIVATE KEY", Bytes: ecder})
This works and generates a "BEGIN EC PRIVATE KEY" block. But when you write the key out in openssl you also get a "BEGIN EC PARAMETERS" block specifying the curve used. Is there a way to write out the EC PARAMETERS to the pem file in Go?