Marshaling the Config object fails

[John Lynch]

I am prototyping a TUI app that will run your protocol over libp2p with nice UX. So far so good! But I need to save the Config for future use in signing, so I'm trying to marshal it with cbor (I also tried JSON but that didnt work either). I am new to Go, so may be missing something obvious, but here is a failing test that shows what I'm attempting...

// Add this test to keygen_test.go and run it
func TestMarshallConfig(t *testing.T) {
	pl := pool.NewPool(0)
	defer pl.TearDown()
	group := curve.Secp256k1{}

	N := 2
	T := N - 1
	configs := FakeData(group, N, T, mrand.New(mrand.NewSource(1)), pl)	

	// Grab one config
	var cfg *Config
	for _, v := range configs {
		cfg = v
	}
	
	b, err := cbor.Marshal(cfg)
	if err != nil {
		t.Fatalf("encode: %v", err)
	}	

	t.Logf("%+v", hex.EncodeToString(b))
	// Paste hex into http://cbor.me/ for diagnostic view

	// Unmarshal into this empty Config doesnt work
	// rehydratedConfig := &Config{}
	// Trying to figure out the sturcture necessary to get Unmarshal to work...
	// Stuck at this error -- decode: cbor: cannot unmarshal byte string into Go struct field keygen.Config.Public of type curve.Point
	// Do you have to use cbor.NewTagSet() or something?
	rehydratedConfig := &Config{Group: curve.Secp256k1{}, ECDSA: curve.Secp256k1{}.NewScalar()}
	err = cbor.Unmarshal(b, rehydratedConfig)
	if err != nil {
		t.Fatalf("decode: %v", err)
	}	
	t.Logf("rehydratedConfig: %+v", rehydratedConfig)
}