private static bool VerifySignature(byte[] signature, byte[] pubKey, Transaction tx, uint inputIndex, byte[] scriptPubKey)
{
BigInteger r, s;
using (MemoryStream ms = new MemoryStream(signature, false))
using (BinaryReader reader = new BinaryReader(ms))
{
if (reader.ReadByte() != 0x30) return false;
reader.ReadByte();
if (reader.ReadByte() != 0x02) return false;
r = new BigInteger(reader.ReadBytes(reader.ReadByte()).Reverse().ToArray());
if (reader.ReadByte() != 0x02) return false;
s = new BigInteger(reader.ReadBytes(reader.ReadByte()).Reverse().ToArray());
}
HashType hashType = (HashType)signature[signature.Length - 1];
byte[] hash = tx.GetHashForVerification(hashType, inputIndex, scriptPubKey);
ECPoint pubKeyPoint;
try
{
pubKeyPoint = ECPoint.DecodePoint(pubKey, ECCurve.Secp256k1);
}
catch
{
return false;
}
ECDsa signer = new ECDsa(pubKeyPoint);
return signer.VerifySignature(hash, r, s);
}
private static bool VerifySignature(byte[] signature, byte[] pubKey, Transaction tx, uint inputIndex, byte[] scriptPubKey)
{
BigInteger r, s;
using (MemoryStream ms = new MemoryStream(signature, false))
using (BinaryReader reader = new BinaryReader(ms))
{
if (reader.ReadByte() != 0x30)
{
return(false);
}
reader.ReadByte();
if (reader.ReadByte() != 0x02)
{
return(false);
}
r = new BigInteger(reader.ReadBytes(reader.ReadByte()).Reverse().ToArray());
if (reader.ReadByte() != 0x02)
{
return(false);
}
s = new BigInteger(reader.ReadBytes(reader.ReadByte()).Reverse().ToArray());
}
HashType hashType = (HashType)signature[signature.Length - 1];
byte[] hash = tx.GetHashForVerification(hashType, inputIndex, scriptPubKey);
ECPoint pubKeyPoint;
try
{
pubKeyPoint = ECPoint.DecodePoint(pubKey, ECCurve.Secp256k1);
}
catch
{
return(false);
}
ECDsa signer = new ECDsa(pubKeyPoint);
return(signer.VerifySignature(hash, r, s));
}
public Transaction SignTransaction(UnsignedTransaction utx)
{
const HashType hashType = HashType.SIGHASH_ALL;
Transaction tx = new Transaction
{
Version = utx.Version,
Inputs = new TransactionInput[utx.Inputs.Length],
Outputs = utx.Outputs,
LockTime = utx.LockTime
};
for (uint i = 0; i < utx.Inputs.Length; i++)
{
tx.Inputs[i] = new TransactionInput
{
PrevHash = utx.Inputs[i].TxId,
PrevIndex = utx.Inputs[i].Index,
Sequence = uint.MaxValue
};
if (utx.Inputs[i].ScriptHash == null) return null;
WalletEntry entry = FindEntry(utx.Inputs[i].ScriptHash);
if (entry == null) return null;
BigInteger[] signature;
using (entry.Decrypt())
{
ECDsa signer = new ECDsa(entry.PrivateKey, ECCurve.Secp256k1);
signature = signer.GenerateSignature(utx.GetHashForSigning(hashType, i));
}
byte[] sigEncoded;
using (MemoryStream ms = new MemoryStream())
using (BinaryWriter writer = new BinaryWriter(ms))
{
byte[] r = signature[0].ToByteArray().Reverse().ToArray();
byte[] s = signature[1].ToByteArray().Reverse().ToArray();
writer.Write((byte)0x30);
writer.Write((byte)(2 + r.Length + 2 + s.Length));
writer.Write((byte)0x02);
writer.Write((byte)r.Length);
writer.Write(r);
writer.Write((byte)0x02);
writer.Write((byte)s.Length);
writer.Write(s);
writer.Write((byte)hashType);
writer.Flush();
sigEncoded = ms.ToArray();
}
using (ScriptBuilder sb = new ScriptBuilder())
{
sb.Push(sigEncoded);
sb.Push(entry.PublicKey.EncodePoint(entry.Compressed));
tx.Inputs[i].Script = sb.ToArray();
}
}
return tx;
}
public Transaction SignTransaction(UnsignedTransaction utx)
{
const HashType hashType = HashType.SIGHASH_ALL;
Transaction tx = new Transaction
{
Version = utx.Version,
Inputs = new TransactionInput[utx.Inputs.Length],
Outputs = utx.Outputs,
LockTime = utx.LockTime
};
for (uint i = 0; i < utx.Inputs.Length; i++)
{
tx.Inputs[i] = new TransactionInput
{
PrevHash = utx.Inputs[i].TxId,
PrevIndex = utx.Inputs[i].Index,
Sequence = uint.MaxValue
};
if (utx.Inputs[i].ScriptHash == null)
{
return(null);
}
WalletEntry entry = FindEntry(utx.Inputs[i].ScriptHash);
if (entry == null)
{
return(null);
}
BigInteger[] signature;
using (entry.Decrypt())
{
ECDsa signer = new ECDsa(entry.PrivateKey, ECCurve.Secp256k1);
signature = signer.GenerateSignature(utx.GetHashForSigning(hashType, i));
}
byte[] sigEncoded;
using (MemoryStream ms = new MemoryStream())
using (BinaryWriter writer = new BinaryWriter(ms))
{
byte[] r = signature[0].ToByteArray().Reverse().ToArray();
byte[] s = signature[1].ToByteArray().Reverse().ToArray();
writer.Write((byte)0x30);
writer.Write((byte)(2 + r.Length + 2 + s.Length));
writer.Write((byte)0x02);
writer.Write((byte)r.Length);
writer.Write(r);
writer.Write((byte)0x02);
writer.Write((byte)s.Length);
writer.Write(s);
writer.Write((byte)hashType);
writer.Flush();
sigEncoded = ms.ToArray();
}
using (ScriptBuilder sb = new ScriptBuilder())
{
sb.Push(sigEncoded);
sb.Push(entry.PublicKey.EncodePoint(entry.Compressed));
tx.Inputs[i].Script = sb.ToArray();
}
}
return(tx);
}