//Sign transaction using private key
public byte[] SignTx(Key priv)
{
//Get serialized transaction
byte[] tx = this.Serialize();
//Debugging
Console.WriteLine("Serialized Tx: ");
foreach (byte b in tx)
{
Console.Write((int)b + " ");
}
Console.WriteLine();
//Generate ECDSA signature
ECDsaSigner signer = new ECDsaSigner(new HMacDsaKCalculator(new Sha256Digest()));
ECPrivateKeyParameters privateKey = new ECPrivateKeyParameters(new BigInteger(1, priv.ToBytes()), domain);
signer.Init(true, privateKey);
BigInteger[] components = signer.GenerateSignature(this.Hash);
//Debugging
Console.WriteLine("Hash value: ");
foreach (byte b in this.Hash)
{
Console.Write((int)b + " ");
}
Console.WriteLine();
Console.WriteLine(components[0] + " " + components[1]);
ECDSASignature ecdsaSignature = new ECDSASignature(components[0], components[1]).ToCanonicalised();
//Encode to DER
byte[] sigs = ecdsaSignature.EncodeToDER();
//Debugging
Console.WriteLine("Signature: ");
foreach (byte b in sigs)
{
Console.Write((int)b + " ");
}
Console.WriteLine();
byte[] sigsLen = BitConverter.GetBytes(sigs.Length);
byte[] pubKey = priv.PubKey.ToBytes();
byte[] pubKeyLen = BitConverter.GetBytes(pubKey.Length);
//Reverse to big endian
if (BitConverter.IsLittleEndian)
{
Array.Reverse(sigsLen);
Array.Reverse(pubKeyLen);
}
//Format: sigLen + sigs + pubKeyLen + pubKey + serialized Tx
List <byte> result = new List <byte>();
result.AddRange(sigsLen);
result.AddRange(sigs);
result.AddRange(pubKeyLen);
result.AddRange(pubKey);
result.AddRange(tx);
Console.WriteLine("Signed bytes: ");
foreach (byte b in result)
{
Console.Write((int)b + " ");
}
Console.WriteLine();
Console.WriteLine("Signed Transaction: " + Convert.ToBase64String(result.ToArray()));
return(result.ToArray());
}