private bool EccRecover(ECCurve curve, ExecutionEngine engine)
{
var r = new System.Numerics.BigInteger(engine.CurrentContext.EvaluationStack.Pop().GetByteArray().Reverse().Concat(new byte[1]).ToArray());
var s = new System.Numerics.BigInteger(engine.CurrentContext.EvaluationStack.Pop().GetByteArray().Reverse().Concat(new byte[1]).ToArray());
bool v = engine.CurrentContext.EvaluationStack.Pop().GetBoolean();
byte[] messageHash = engine.CurrentContext.EvaluationStack.Pop().GetByteArray();
try
{
ECPoint point = ECDsa.KeyRecover(curve, r, s, messageHash, v);
engine.CurrentContext.EvaluationStack.Push(point.EncodePoint(false).Skip(1).ToArray());
}
catch
{
engine.CurrentContext.EvaluationStack.Push(new byte[0]);
}
return(true);
}
public static void KeyRecover(ECCurve Curve)
{
byte[] privateKey = generatekey(32);
ECPoint publicKey = Curve.G * privateKey;
ECDsa ecdsa = new ECDsa(privateKey, Curve);
byte[] message = System.Text.Encoding.Default.GetBytes("HelloWorld");
BigInteger[] signatures = ecdsa.GenerateSignature(message);
BigInteger r = signatures[0];
BigInteger s = signatures[1];
bool v;
if (signatures[2] == 0)
{
v = true;
}
else
{
v = false;
}
ECPoint recoverKey = ECDsa.KeyRecover(Curve, r, s, message, v);
Assert.IsTrue(recoverKey.Equals(publicKey));
//wrong r part
r = new BigInteger(generatekey(32));
s = new BigInteger(generatekey(32));
try
{
recoverKey = ECDsa.KeyRecover(Curve, r, s, message, v);
Assert.IsFalse(recoverKey.Equals(publicKey));
}
catch (Exception e)
{
Assert.IsTrue(e.GetType() == typeof(ArithmeticException));
}
}
