public bool HandleSendValue(int sender, ValueMessage message)
{
if (_keyGenStates[message.Proposer].Acks[sender])
{
throw new ArgumentException("Already handled this value");
}
_keyGenStates[message.Proposer].Acks[sender] = true;
var myValue = Fr.FromBytes(Crypto.Secp256K1Decrypt(
_keyPair.PrivateKey.Encode(), message.EncryptedValues[_myIdx]
));
if (_keyGenStates[message.Proposer].Commitment is null)
{
throw new ArgumentException("Cannot handle value since there was no commitment yet");
}
if (!_keyGenStates[message.Proposer].Commitment !.Evaluate(_myIdx + 1, sender + 1)
.Equals(G1.Generator * myValue)
)
{
throw new ArgumentException("Decrypted value does not match commitment");
}
_keyGenStates[message.Proposer].Values[sender] = myValue;
if (_keyGenStates[message.Proposer].ValueCount() > 2 * Faulty && !_finished.Contains(message.Proposer))
{
_finished.Add(message.Proposer);
}
if (_confirmSent)
{
return(false);
}
if (!Finished())
{
return(false);
}
_confirmSent = true;
return(true);
}
public void Test_Secp256K1EncryptDecryptRoundTrip()
{
var key = Crypto.GeneratePrivateKey();
var baseText =
"0xf86d808504a817c800832dc6c0948e7b7262e0fa4616566591d51f998f16a79fb547880de0b6b3a76400008025a0115105d96a43f41a5ea562bb3e591cbfa431a8cdae9c3030457adca2cb854f78a012fb41922c53c73473563003667ed8e783359c91d95b42301e1955d530b1ca33"
.HexToBytes();
const int n = 1000;
var startTs = TimeUtils.CurrentTimeMillis();
for (var it = 0; it < n; ++it)
{
var plaintext = baseText.Concat(it.ToBytes()).ToArray();
var cipher = Crypto.Secp256K1Encrypt(key.ToPrivateKey().GetPublicKey().EncodeCompressed(), plaintext);
var decrypted = Crypto.Secp256K1Decrypt(key, cipher);
Assert.IsTrue(plaintext.SequenceEqual(decrypted));
}
var endTs = TimeUtils.CurrentTimeMillis();
Console.WriteLine($"{n} encrypt/decrypt: {endTs - startTs}ms, avg = {(double) (endTs - startTs) / n}");
}
