public void Sign(byte[] privateKey, Dictionary <string, Transaction> prevTxs)
{
if (IsCoinBase())
{
return;
}
foreach (var inp in Inputs)
{
var hex = HexadecimalEncoding.ToHexString(inp.Id);
if (prevTxs[hex]?.Id == null)
{
Console.WriteLine("prev transaction does not exist");
}
}
var txCopy = TransactionTrimmed(this);
var index = 0;
foreach (var inp in txCopy.Inputs)
{
var prevTx = prevTxs[HexadecimalEncoding.ToHexString(inp.Id)];
txCopy.Inputs[index].Signature = null;
txCopy.Inputs[index].PubKey = prevTx.Outputs[inp.Out].PublicKeyHash;
txCopy.Id = txCopy.CalculateHash();
txCopy.Inputs[index].PubKey = null;
var signature = CryptoFinal.SignTransaction(txCopy.Id, privateKey);
Inputs[index].Signature = signature;
index++;
}
}
//makes sure, that wallet is valid, its public and private keys are ok
public bool IsValid()
{
var testMessage = "this is my test message to be signed";
var signature = CryptoFinal.SignTransaction(ByteHelper.GetBytesFromString(testMessage), PrivateKey);
var isOk = CryptoFinal.VerifyHashed(signature, PublicKey, ByteHelper.GetBytesFromString(testMessage));
return(isOk);
}
public WalletCore(string hashedPassword)
{
PrivateKey = CryptoFinal.GeneratePrivateKey();
PublicKey = CryptoFinal.GetPublicKey(PrivateKey);
PublicKeyHash = PublicKeyHashed(PublicKey);
PasswordHash = hashedPassword;
var version = new byte[] { 0x00 };
var versionHashed = ArrayHelpers.ConcatArrays(version, PublicKeyHash);
var address = Base58Encoding.EncodeWithCheckSum(versionHashed);
Address = address;
}
public bool Verify(Dictionary <string, Transaction> prevTxs)
{
if (IsCoinBase())
{
return(true);
}
foreach (var inp in Inputs)
{
var hex = HexadecimalEncoding.ToHexString(inp.Id);
if (prevTxs[hex]?.Id == null)
{
Console.WriteLine("prev transaction does not exist");
}
}
var txCopy = TransactionTrimmed(this);
var index = 0;
foreach (var inp in Inputs)
{
var prevTx = prevTxs[HexadecimalEncoding.ToHexString(inp.Id)];
txCopy.Inputs[index].Signature = null;
txCopy.Inputs[index].PubKey = prevTx.Outputs[inp.Out].PublicKeyHash;
txCopy.Id = txCopy.CalculateHash();
txCopy.Inputs[index].PubKey = null;
var(r, s, v) = CryptoFinal.GetRSV(inp.Signature);
var recoveredKey =
CryptoFinal.RecoverPublicKey(r.ToByteArray(), s.ToByteArray(), v.ToByteArray(), txCopy.Id);
if (!CryptoFinal.VerifyHashed(inp.Signature, recoveredKey, txCopy.Id))
{
Console.WriteLine("verify failed");
return(false);
}
index++;
}
//Console.WriteLine("verify ok");
return(true);
}