public byte[] ComputeSigHash(Transaction transaction, TransactionInput input, TransactionOutput priorOutput, SigHashType sigHashType)
{
if (sigHashType != SigHashType.All)
{
throw new NotImplementedException("Only supports SigHashType.All");
}
var hashingScript = IsPayToScriptHash(input.SigScript, priorOutput.ScriptPubKey) ?
DecodeRedeemScript((byte[])input.SigScript.Commands[^ 1]) :
async Task <bool> InternalVerify(Transaction transaction, TransactionInput input)
{
var priorOutput = await fetcher.FetchPriorOutput(input);
var script = new Script(input.SigScript, priorOutput.ScriptPubKey);
var sigHash = hasher.ComputeSigHash(transaction, input, priorOutput, SigHashType.All);
return(evaluator.Evaluate(script.Commands, sigHash));
}
public override async Task <Script> CreateSigScript(Wallet wallet, Transaction transaction, TransactionInput input, SigHashType sigHashType)
{
var priorOutput = await Fetcher.FetchPriorOutput(input);
if (priorOutput.ScriptPubKey.Commands.Count < 3 ||
!(priorOutput.ScriptPubKey.Commands[2] is byte[] hash))
{
throw new FormatException("Unexpected opcode in output script");
}
var privateKey = wallet.FindByHash(hash);
if (privateKey == null)
{
throw new PrivateKeyNotFoundException("Key not found in wallet");
}
return(await CreateSigScript(privateKey, transaction, input, sigHashType));
}
public override async Task <Script> CreateSigScript(PrivateKey privateKey, Transaction transaction, TransactionInput input, SigHashType sigHashType)
{
var signature = await ComputeSignatureBytes(privateKey, transaction, input, sigHashType);
var sec = privateKey.PublicKey.ToSec();
return(new Script(signature, sec));
}
protected async Task <byte[]> ComputeSignatureBytes(PrivateKey privateKey, Transaction transaction, TransactionInput input, SigHashType sigHashType)
{
var hash = await hasher.ComputeSigHash(transaction, input, sigHashType);
return(privateKey.Sign(hash).ToDer().Concat((byte)sigHashType));
}
public async Task <byte[]> ComputeSigHash(Transaction transaction, TransactionInput input, SigHashType sigHashType)
{
var priorOutput = await fetcher.FetchPriorOutput(input);
return(ComputeSigHash(transaction, input, priorOutput, sigHashType));
}
public abstract Task <Script> CreateSigScript(Wallet wallet, Transaction transaction, TransactionInput input, SigHashType sigHashType);
public abstract Task <Script> CreateSigScript(PrivateKey privateKey, Transaction transaction, TransactionInput input, SigHashType sigHashType);
public Transaction CloneWithReplacedSigScript(TransactionInput input, Script script)
{
var newInputs = Inputs.Select(i => i == input ? i.CloneWithSigScript(script) : i.CloneWithoutSigScript());
return(new(Version, Segwit, newInputs, Outputs, LockTime, Testnet));
}
public Transaction CloneWithReplacedInput(TransactionInput oldInput, TransactionInput newInput)
{
var newInputs = Inputs.Select(i => i == oldInput ? newInput : i);
return(new(Version, Segwit, newInputs, Outputs, LockTime, Testnet));
}
public async Task <TransactionOutput> FetchPriorOutput(TransactionInput input)
{
return(await FetchOutput(new OutputPoint(input.PreviousTransaction, input.PreviousIndex)));
}