Marshaling the Config object fails

[johnthethird]

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)
}