public void SignInputs(Transaction transaction, SignerBag bag)
{
foreach (var transactionInput in transaction.Inputs)
{
var redeem = bag.Find(transactionInput.Outpoint);
Thrower.If(redeem.IsNull()).Throw <TransactionException>("redeem script was not found");
var redeemScript = new Script.Script(CryptoUtil.ConvertHex(redeem.ScriptPubKeyHex));
var signature = this.CalculateSignature(transaction, transactionInput.Outpoint, redeem.PrivateKey.Key, redeemScript, Transaction.SigHash.All);
var signedScript = ScriptBuilder.CreateInputScript(signature, redeem.PrivateKey.Key);
transactionInput.ScriptBytes = signedScript.GetProgram();
}
}
public TransactionSignature CalculateSignature(Transaction transaction, TransactionOutPoint outPoint, EcKey key, Script.Script redeemScript, Transaction.SigHash hashType)
{
// at the moment only signing all the outputs is supported
Thrower.If(hashType != Transaction.SigHash.All).Throw <TransactionException>("Only SigHash type 'All' supported");
//// clone the transaction and clear all the inputs
//// only the inputs for the equivalent output needs to be present for signing
var signTx = transaction.Clone();
signTx.Inputs.ForEach(input => input.ScriptBytes = Enumerable.Empty <byte>().ToArray());
// set the redeem script and clear it of 'OP_CODESEPARATOR'
var connectedScript = redeemScript.GetProgram();
var redeemConnectedScript = Script.Script.RemoveAllInstancesOfOp(connectedScript, ScriptOpCodes.OP_CODESEPARATOR);
signTx.FindInput(outPoint).ScriptBytes = redeemConnectedScript;
// serialize then hash the transaction to HEX and sign it.
var trxHex = this.Serializer.ToHex(signTx, hashType);
var hash = CryptoUtil.Sha256HashTwice(CryptoUtil.ConvertHex(trxHex));
return(new TransactionSignature(key.Sign(hash), hashType));
}