static void TestSign()
{
Console.WriteLine("TestSign");
SecretKey sec = new SecretKey();
sec.SetByCSPRNG();
PublicKey pub = sec.GetPublicKey();
String m = "abc";
Signature sig = sec.Signature(m);
assert("verify", pub.Verify(sig, m));
assert("not verify", !pub.Verify(sig, m + "a"));
}
