cb40b3abd4
When signing an input, figure out what was requested for but was unable to be found and store it in a SignatureData. Return this information in SignPSBTInput.
316 lines
10 KiB
C++
316 lines
10 KiB
C++
// Copyright (c) 2009-2018 The Bitcoin Core developers
|
|
// Distributed under the MIT software license, see the accompanying
|
|
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
|
|
|
|
#include <psbt.h>
|
|
#include <util/strencodings.h>
|
|
|
|
PartiallySignedTransaction::PartiallySignedTransaction(const CMutableTransaction& tx) : tx(tx)
|
|
{
|
|
inputs.resize(tx.vin.size());
|
|
outputs.resize(tx.vout.size());
|
|
}
|
|
|
|
bool PartiallySignedTransaction::IsNull() const
|
|
{
|
|
return !tx && inputs.empty() && outputs.empty() && unknown.empty();
|
|
}
|
|
|
|
bool PartiallySignedTransaction::Merge(const PartiallySignedTransaction& psbt)
|
|
{
|
|
// Prohibited to merge two PSBTs over different transactions
|
|
if (tx->GetHash() != psbt.tx->GetHash()) {
|
|
return false;
|
|
}
|
|
|
|
for (unsigned int i = 0; i < inputs.size(); ++i) {
|
|
inputs[i].Merge(psbt.inputs[i]);
|
|
}
|
|
for (unsigned int i = 0; i < outputs.size(); ++i) {
|
|
outputs[i].Merge(psbt.outputs[i]);
|
|
}
|
|
unknown.insert(psbt.unknown.begin(), psbt.unknown.end());
|
|
|
|
return true;
|
|
}
|
|
|
|
bool PartiallySignedTransaction::IsSane() const
|
|
{
|
|
for (PSBTInput input : inputs) {
|
|
if (!input.IsSane()) return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool PartiallySignedTransaction::AddInput(const CTxIn& txin, PSBTInput& psbtin)
|
|
{
|
|
if (std::find(tx->vin.begin(), tx->vin.end(), txin) != tx->vin.end()) {
|
|
return false;
|
|
}
|
|
tx->vin.push_back(txin);
|
|
psbtin.partial_sigs.clear();
|
|
psbtin.final_script_sig.clear();
|
|
psbtin.final_script_witness.SetNull();
|
|
inputs.push_back(psbtin);
|
|
return true;
|
|
}
|
|
|
|
bool PartiallySignedTransaction::AddOutput(const CTxOut& txout, const PSBTOutput& psbtout)
|
|
{
|
|
tx->vout.push_back(txout);
|
|
outputs.push_back(psbtout);
|
|
return true;
|
|
}
|
|
|
|
bool PSBTInput::IsNull() const
|
|
{
|
|
return !non_witness_utxo && witness_utxo.IsNull() && partial_sigs.empty() && unknown.empty() && hd_keypaths.empty() && redeem_script.empty() && witness_script.empty();
|
|
}
|
|
|
|
void PSBTInput::FillSignatureData(SignatureData& sigdata) const
|
|
{
|
|
if (!final_script_sig.empty()) {
|
|
sigdata.scriptSig = final_script_sig;
|
|
sigdata.complete = true;
|
|
}
|
|
if (!final_script_witness.IsNull()) {
|
|
sigdata.scriptWitness = final_script_witness;
|
|
sigdata.complete = true;
|
|
}
|
|
if (sigdata.complete) {
|
|
return;
|
|
}
|
|
|
|
sigdata.signatures.insert(partial_sigs.begin(), partial_sigs.end());
|
|
if (!redeem_script.empty()) {
|
|
sigdata.redeem_script = redeem_script;
|
|
}
|
|
if (!witness_script.empty()) {
|
|
sigdata.witness_script = witness_script;
|
|
}
|
|
for (const auto& key_pair : hd_keypaths) {
|
|
sigdata.misc_pubkeys.emplace(key_pair.first.GetID(), key_pair);
|
|
}
|
|
}
|
|
|
|
void PSBTInput::FromSignatureData(const SignatureData& sigdata)
|
|
{
|
|
if (sigdata.complete) {
|
|
partial_sigs.clear();
|
|
hd_keypaths.clear();
|
|
redeem_script.clear();
|
|
witness_script.clear();
|
|
|
|
if (!sigdata.scriptSig.empty()) {
|
|
final_script_sig = sigdata.scriptSig;
|
|
}
|
|
if (!sigdata.scriptWitness.IsNull()) {
|
|
final_script_witness = sigdata.scriptWitness;
|
|
}
|
|
return;
|
|
}
|
|
|
|
partial_sigs.insert(sigdata.signatures.begin(), sigdata.signatures.end());
|
|
if (redeem_script.empty() && !sigdata.redeem_script.empty()) {
|
|
redeem_script = sigdata.redeem_script;
|
|
}
|
|
if (witness_script.empty() && !sigdata.witness_script.empty()) {
|
|
witness_script = sigdata.witness_script;
|
|
}
|
|
for (const auto& entry : sigdata.misc_pubkeys) {
|
|
hd_keypaths.emplace(entry.second);
|
|
}
|
|
}
|
|
|
|
void PSBTInput::Merge(const PSBTInput& input)
|
|
{
|
|
if (!non_witness_utxo && input.non_witness_utxo) non_witness_utxo = input.non_witness_utxo;
|
|
if (witness_utxo.IsNull() && !input.witness_utxo.IsNull()) {
|
|
witness_utxo = input.witness_utxo;
|
|
non_witness_utxo = nullptr; // Clear out any non-witness utxo when we set a witness one.
|
|
}
|
|
|
|
partial_sigs.insert(input.partial_sigs.begin(), input.partial_sigs.end());
|
|
hd_keypaths.insert(input.hd_keypaths.begin(), input.hd_keypaths.end());
|
|
unknown.insert(input.unknown.begin(), input.unknown.end());
|
|
|
|
if (redeem_script.empty() && !input.redeem_script.empty()) redeem_script = input.redeem_script;
|
|
if (witness_script.empty() && !input.witness_script.empty()) witness_script = input.witness_script;
|
|
if (final_script_sig.empty() && !input.final_script_sig.empty()) final_script_sig = input.final_script_sig;
|
|
if (final_script_witness.IsNull() && !input.final_script_witness.IsNull()) final_script_witness = input.final_script_witness;
|
|
}
|
|
|
|
bool PSBTInput::IsSane() const
|
|
{
|
|
// Cannot have both witness and non-witness utxos
|
|
if (!witness_utxo.IsNull() && non_witness_utxo) return false;
|
|
|
|
// If we have a witness_script or a scriptWitness, we must also have a witness utxo
|
|
if (!witness_script.empty() && witness_utxo.IsNull()) return false;
|
|
if (!final_script_witness.IsNull() && witness_utxo.IsNull()) return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
void PSBTOutput::FillSignatureData(SignatureData& sigdata) const
|
|
{
|
|
if (!redeem_script.empty()) {
|
|
sigdata.redeem_script = redeem_script;
|
|
}
|
|
if (!witness_script.empty()) {
|
|
sigdata.witness_script = witness_script;
|
|
}
|
|
for (const auto& key_pair : hd_keypaths) {
|
|
sigdata.misc_pubkeys.emplace(key_pair.first.GetID(), key_pair);
|
|
}
|
|
}
|
|
|
|
void PSBTOutput::FromSignatureData(const SignatureData& sigdata)
|
|
{
|
|
if (redeem_script.empty() && !sigdata.redeem_script.empty()) {
|
|
redeem_script = sigdata.redeem_script;
|
|
}
|
|
if (witness_script.empty() && !sigdata.witness_script.empty()) {
|
|
witness_script = sigdata.witness_script;
|
|
}
|
|
for (const auto& entry : sigdata.misc_pubkeys) {
|
|
hd_keypaths.emplace(entry.second);
|
|
}
|
|
}
|
|
|
|
bool PSBTOutput::IsNull() const
|
|
{
|
|
return redeem_script.empty() && witness_script.empty() && hd_keypaths.empty() && unknown.empty();
|
|
}
|
|
|
|
void PSBTOutput::Merge(const PSBTOutput& output)
|
|
{
|
|
hd_keypaths.insert(output.hd_keypaths.begin(), output.hd_keypaths.end());
|
|
unknown.insert(output.unknown.begin(), output.unknown.end());
|
|
|
|
if (redeem_script.empty() && !output.redeem_script.empty()) redeem_script = output.redeem_script;
|
|
if (witness_script.empty() && !output.witness_script.empty()) witness_script = output.witness_script;
|
|
}
|
|
bool PSBTInputSigned(PSBTInput& input)
|
|
{
|
|
return !input.final_script_sig.empty() || !input.final_script_witness.IsNull();
|
|
}
|
|
|
|
bool SignPSBTInput(const SigningProvider& provider, PartiallySignedTransaction& psbt, int index, int sighash, SignatureData* out_sigdata, bool use_dummy)
|
|
{
|
|
PSBTInput& input = psbt.inputs.at(index);
|
|
const CMutableTransaction& tx = *psbt.tx;
|
|
|
|
if (PSBTInputSigned(input)) {
|
|
return true;
|
|
}
|
|
|
|
// Fill SignatureData with input info
|
|
SignatureData sigdata;
|
|
input.FillSignatureData(sigdata);
|
|
|
|
// Get UTXO
|
|
bool require_witness_sig = false;
|
|
CTxOut utxo;
|
|
|
|
// Verify input sanity, which checks that at most one of witness or non-witness utxos is provided.
|
|
if (!input.IsSane()) {
|
|
return false;
|
|
}
|
|
|
|
if (input.non_witness_utxo) {
|
|
// If we're taking our information from a non-witness UTXO, verify that it matches the prevout.
|
|
COutPoint prevout = tx.vin[index].prevout;
|
|
if (input.non_witness_utxo->GetHash() != prevout.hash) {
|
|
return false;
|
|
}
|
|
utxo = input.non_witness_utxo->vout[prevout.n];
|
|
} else if (!input.witness_utxo.IsNull()) {
|
|
utxo = input.witness_utxo;
|
|
// When we're taking our information from a witness UTXO, we can't verify it is actually data from
|
|
// the output being spent. This is safe in case a witness signature is produced (which includes this
|
|
// information directly in the hash), but not for non-witness signatures. Remember that we require
|
|
// a witness signature in this situation.
|
|
require_witness_sig = true;
|
|
} else {
|
|
return false;
|
|
}
|
|
|
|
sigdata.witness = false;
|
|
bool sig_complete;
|
|
if (use_dummy) {
|
|
sig_complete = ProduceSignature(provider, DUMMY_SIGNATURE_CREATOR, utxo.scriptPubKey, sigdata);
|
|
} else {
|
|
MutableTransactionSignatureCreator creator(&tx, index, utxo.nValue, sighash);
|
|
sig_complete = ProduceSignature(provider, creator, utxo.scriptPubKey, sigdata);
|
|
}
|
|
// Verify that a witness signature was produced in case one was required.
|
|
if (require_witness_sig && !sigdata.witness) return false;
|
|
input.FromSignatureData(sigdata);
|
|
|
|
// If we have a witness signature, use the smaller witness UTXO.
|
|
if (sigdata.witness) {
|
|
input.witness_utxo = utxo;
|
|
input.non_witness_utxo = nullptr;
|
|
}
|
|
|
|
// Fill in the missing info
|
|
if (out_sigdata) {
|
|
out_sigdata->missing_pubkeys = sigdata.missing_pubkeys;
|
|
out_sigdata->missing_sigs = sigdata.missing_sigs;
|
|
out_sigdata->missing_redeem_script = sigdata.missing_redeem_script;
|
|
out_sigdata->missing_witness_script = sigdata.missing_witness_script;
|
|
}
|
|
|
|
return sig_complete;
|
|
}
|
|
|
|
bool FinalizePSBT(PartiallySignedTransaction& psbtx)
|
|
{
|
|
// Finalize input signatures -- in case we have partial signatures that add up to a complete
|
|
// signature, but have not combined them yet (e.g. because the combiner that created this
|
|
// PartiallySignedTransaction did not understand them), this will combine them into a final
|
|
// script.
|
|
bool complete = true;
|
|
for (unsigned int i = 0; i < psbtx.tx->vin.size(); ++i) {
|
|
complete &= SignPSBTInput(DUMMY_SIGNING_PROVIDER, psbtx, i, SIGHASH_ALL);
|
|
}
|
|
|
|
return complete;
|
|
}
|
|
|
|
bool FinalizeAndExtractPSBT(PartiallySignedTransaction& psbtx, CMutableTransaction& result)
|
|
{
|
|
// It's not safe to extract a PSBT that isn't finalized, and there's no easy way to check
|
|
// whether a PSBT is finalized without finalizing it, so we just do this.
|
|
if (!FinalizePSBT(psbtx)) {
|
|
return false;
|
|
}
|
|
|
|
result = *psbtx.tx;
|
|
for (unsigned int i = 0; i < result.vin.size(); ++i) {
|
|
result.vin[i].scriptSig = psbtx.inputs[i].final_script_sig;
|
|
result.vin[i].scriptWitness = psbtx.inputs[i].final_script_witness;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool CombinePSBTs(PartiallySignedTransaction& out, TransactionError& error, const std::vector<PartiallySignedTransaction>& psbtxs)
|
|
{
|
|
out = psbtxs[0]; // Copy the first one
|
|
|
|
// Merge
|
|
for (auto it = std::next(psbtxs.begin()); it != psbtxs.end(); ++it) {
|
|
if (!out.Merge(*it)) {
|
|
error = TransactionError::PSBT_MISMATCH;
|
|
return false;
|
|
}
|
|
}
|
|
if (!out.IsSane()) {
|
|
error = TransactionError::INVALID_PSBT;
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|