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Construct and use PrecomputedTransactionData in PSBT signing

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This commit is contained in:
Pieter Wuille
2021-03-03 16:47:44 -08:00
parent 5cb6502ac5
commit fd3f6890f3
10 changed files with 50 additions and 21 deletions
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26
src/psbt.cpp
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@@ -227,7 +227,24 @@ void UpdatePSBTOutput(const SigningProvider& provider, PartiallySignedTransactio
psbt_out.FromSignatureData(sigdata);
}
bool SignPSBTInput(const SigningProvider& provider, PartiallySignedTransaction& psbt, int index, int sighash, SignatureData* out_sigdata, bool use_dummy)
PrecomputedTransactionData PrecomputePSBTData(const PartiallySignedTransaction& psbt)
{
const CMutableTransaction& tx = *psbt.tx;
bool have_all_spent_outputs = true;
std::vector<CTxOut> utxos(tx.vin.size());
for (size_t idx = 0; idx < tx.vin.size(); ++idx) {
if (!psbt.GetInputUTXO(utxos[idx], idx)) have_all_spent_outputs = false;
}
PrecomputedTransactionData txdata;
if (have_all_spent_outputs) {
txdata.Init(tx, std::move(utxos), true);
} else {
txdata.Init(tx, {}, true);
}
return txdata;
}
bool SignPSBTInput(const SigningProvider& provider, PartiallySignedTransaction& psbt, int index, const PrecomputedTransactionData* txdata, int sighash, SignatureData* out_sigdata)
{
PSBTInput& input = psbt.inputs.at(index);
const CMutableTransaction& tx = *psbt.tx;
@@ -267,10 +284,10 @@ bool SignPSBTInput(const SigningProvider& provider, PartiallySignedTransaction&
sigdata.witness = false;
bool sig_complete;
if (use_dummy) {
if (txdata == nullptr) {
sig_complete = ProduceSignature(provider, DUMMY_SIGNATURE_CREATOR, utxo.scriptPubKey, sigdata);
} else {
MutableTransactionSignatureCreator creator(&tx, index, utxo.nValue, sighash);
MutableTransactionSignatureCreator creator(&tx, index, utxo.nValue, txdata, sighash);
sig_complete = ProduceSignature(provider, creator, utxo.scriptPubKey, sigdata);
}
// Verify that a witness signature was produced in case one was required.
@@ -302,8 +319,9 @@ bool FinalizePSBT(PartiallySignedTransaction& psbtx)
// PartiallySignedTransaction did not understand them), this will combine them into a final
// script.
bool complete = true;
const PrecomputedTransactionData txdata = PrecomputePSBTData(psbtx);
for (unsigned int i = 0; i < psbtx.tx->vin.size(); ++i) {
complete &= SignPSBTInput(DUMMY_SIGNING_PROVIDER, psbtx, i, SIGHASH_ALL);
complete &= SignPSBTInput(DUMMY_SIGNING_PROVIDER, psbtx, i, &txdata, SIGHASH_ALL);
}
return complete;