static void Main()
{
ETHTransaction tx = new ETHTransaction();
tx.m_nonce = BigInteger.Parse("16");
tx.m_gasPrice = BigInteger.Parse("10000000000");
tx.m_gasLimit = BigInteger.Parse("21000");
tx.m_to = Encode.HexToBytes("1111111111111111111111111111111111111111");
tx.m_value = BigInteger.Parse("100");
tx.m_initOrData = Encode.HexToBytes("");
tx.ECDsaSign("ETH", Encode.BytesToBigInteger(Encode.HexToBytes("1111111111111111111111111111111111111111111111111111111111111111")));
Console.Write(Encode.BytesToHex(tx.EncodeRLP()));
}
public static bool HexToPrivateKey(string hex, out BigInteger privateKey)
{
privateKey = 0;
byte[] data = Encode.HexToBytes(hex, 32);
if (data == null)
{
return(false);
}
privateKey = Encode.BytesToBigInteger(data);
if (!IsPrivateKeyValid(privateKey))
{
return(false);
}
return(true);
}
public static BigInteger PasswordToPrivateKey(string password)
{
// change salt for improved security
// reference https://en.wikipedia.org/wiki/Key_stretching
// reference https://en.wikipedia.org/wiki/Salt_(cryptography)
string salt = "Cryptography";
var pbkdf2 = new Rfc2898DeriveBytes(
Encoding.UTF8.GetBytes(password),
Encoding.UTF8.GetBytes(salt),
4096);
BigInteger privateKey = Encode.BytesToBigInteger(pbkdf2.GetBytes(32));
if (!EllipticCurve.IsPrivateKeyValid(privateKey))
{
throw new Exception("privateKey is invalid."); // extreme low probability to happen
}
return(privateKey);
}
public void ECDsaSign(string currency, BigInteger privateKey)
{
int chainId = GetChainId(currency);
m_v = new BigInteger(chainId);
m_r = new BigInteger(0);
m_s = new BigInteger(0);
byte[] e = BouncyCastle.Keccak(EncodeRLP());
byte[] sig = EllipticCurve.ECDsaSignHash(privateKey, e);
BigInteger publicKeyX;
BigInteger publicKeyY;
BouncyCastle.ECPrivateKeyToPublicKey(privateKey, out publicKeyX, out publicKeyY);
int recoveryId = BouncyCastle.ECCalcRecoveryId(sig.Take(32).ToArray(), sig.Skip(32).ToArray(), e, publicKeyX, publicKeyY);
m_v = new BigInteger(chainId * 2 + 35 + recoveryId);
m_r = Encode.BytesToBigInteger(sig.Take(32).ToArray());
m_s = Encode.BytesToBigInteger(sig.Skip(32).ToArray());
}
