public Transaction Sign(string privateKey, string recipientAddress, ulong amount, DateTime signDate)
{
BigInteger hexPrivateKey = new BigInteger(privateKey, 16);
string publicKey = CryptoUtil.GetPublicKeyCompressed(privateKey);
string senderAddress = CalcRipeMD160(publicKey);
TransactionRaw transactionRaw = new TransactionRaw()
{
FromAddress = senderAddress,
ToAddress = recipientAddress,
Amount = amount,
DateCreated = signDate
};
string tranJson = JsonConvert.SerializeObject(transactionRaw);
byte[] tranHash = CryptoUtil.CalcSHA256(tranJson);
BigInteger[] tranSignature = SignData(hexPrivateKey, tranHash);
string txhash = CryptoUtil.CalcSHA256String(tranJson);
Transaction signedTransaction = new Transaction()
{
FromAddress = transactionRaw.FromAddress,
ToAddress = transactionRaw.ToAddress,
Amount = transactionRaw.Amount,
DateCreated = transactionRaw.DateCreated,
TransactionHash = txhash,
SenderPublicKey = publicKey,
Signature = new string[] { tranSignature[0].ToString(16), tranSignature[1].ToString(16) }
};
return(signedTransaction);
}
public bool IsValid(Transaction transaction)
{
ECDomainParameters ecSpec = new ECDomainParameters(CryptoUtil.Curve.Curve, CryptoUtil.Curve.G, CryptoUtil.Curve.N, CryptoUtil.Curve.H);
IDsaKCalculator kCalculator = new HMacDsaKCalculator(new Sha256Digest());
var point = DecodeECPointPublicKey(transaction.SenderPublicKey);
ECPublicKeyParameters keyParameters = new ECPublicKeyParameters(point, ecSpec);
ECDsaSigner signer = new ECDsaSigner(kCalculator);
signer.Init(false, keyParameters);
var pubKey1 = new BigInteger(transaction.Signature[0], 16);
var pubKey2 = new BigInteger(transaction.Signature[1], 16);
TransactionRaw transactionRaw = new TransactionRaw()
{
FromAddress = transaction.FromAddress,
ToAddress = transaction.ToAddress,
Amount = transaction.Amount,
DateCreated = transaction.DateCreated
};
string tranJson = JsonConvert.SerializeObject(transactionRaw);
byte[] tranHash = CryptoUtil.CalcSHA256(tranJson);
return(signer.VerifySignature(tranHash, pubKey1, pubKey2));
}
public bool IsValidateHash(Transaction transaction)
{
TransactionRaw txRaw = new TransactionRaw();
txRaw.ToAddress = transaction.ToAddress;
txRaw.FromAddress = transaction.FromAddress;
txRaw.Amount = transaction.Amount;
txRaw.DateCreated = transaction.DateCreated;
string jsonTx = JsonConvert.SerializeObject(txRaw);
string txHash = CryptoUtil.CalcSHA256String(jsonTx);
return(transaction.TransactionHash == txHash);
}
