public void Ecdh()
{
var s = Secp256K1.WithCaps(ContextFlag.SignOnly);
var(sk1, pk1) = s.generate_keypair(RandomNumberGenerator.Create());
var(sk2, pk2) = s.generate_keypair(RandomNumberGenerator.Create());
var sec1 = SharedSecret.New(s, pk1, sk2);
var sec2 = SharedSecret.New(s, pk2, sk1);
var secOdd = SharedSecret.New(s, pk1, sk1);
Assert.Equal(sec1.Value, sec2.Value);
Assert.NotEqual(secOdd.Value, sec2.Value);
}