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376 lines
13 KiB
376 lines
13 KiB
// Copyright (c) 2009-2020 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include <psbt.h>
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#include <util/strencodings.h>
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PartiallySignedTransaction::PartiallySignedTransaction(const CMutableTransaction& tx) : tx(tx)
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{
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inputs.resize(tx.vin.size());
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outputs.resize(tx.vout.size());
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}
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bool PartiallySignedTransaction::IsNull() const
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{
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return !tx && inputs.empty() && outputs.empty() && unknown.empty();
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}
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bool PartiallySignedTransaction::Merge(const PartiallySignedTransaction& psbt)
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{
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// Prohibited to merge two PSBTs over different transactions
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if (tx->GetHash() != psbt.tx->GetHash()) {
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return false;
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}
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for (unsigned int i = 0; i < inputs.size(); ++i) {
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inputs[i].Merge(psbt.inputs[i]);
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}
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for (unsigned int i = 0; i < outputs.size(); ++i) {
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outputs[i].Merge(psbt.outputs[i]);
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}
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unknown.insert(psbt.unknown.begin(), psbt.unknown.end());
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return true;
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}
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bool PartiallySignedTransaction::AddInput(const CTxIn& txin, PSBTInput& psbtin)
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{
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if (std::find(tx->vin.begin(), tx->vin.end(), txin) != tx->vin.end()) {
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return false;
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}
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tx->vin.push_back(txin);
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psbtin.partial_sigs.clear();
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psbtin.final_script_sig.clear();
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psbtin.final_script_witness.SetNull();
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inputs.push_back(psbtin);
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return true;
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}
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bool PartiallySignedTransaction::AddOutput(const CTxOut& txout, const PSBTOutput& psbtout)
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{
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tx->vout.push_back(txout);
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outputs.push_back(psbtout);
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return true;
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}
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bool PartiallySignedTransaction::GetInputUTXO(CTxOut& utxo, int input_index) const
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{
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PSBTInput input = inputs[input_index];
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uint32_t prevout_index = tx->vin[input_index].prevout.n;
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if (input.non_witness_utxo) {
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if (prevout_index >= input.non_witness_utxo->vout.size()) {
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return false;
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}
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utxo = input.non_witness_utxo->vout[prevout_index];
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} else if (!input.witness_utxo.IsNull()) {
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utxo = input.witness_utxo;
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} else {
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return false;
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}
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return true;
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}
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bool PSBTInput::IsNull() const
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{
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return !non_witness_utxo && witness_utxo.IsNull() && partial_sigs.empty() && unknown.empty() && hd_keypaths.empty() && redeem_script.empty() && witness_script.empty();
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}
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void PSBTInput::FillSignatureData(SignatureData& sigdata) const
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{
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if (!final_script_sig.empty()) {
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sigdata.scriptSig = final_script_sig;
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sigdata.complete = true;
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}
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if (!final_script_witness.IsNull()) {
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sigdata.scriptWitness = final_script_witness;
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sigdata.complete = true;
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}
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if (sigdata.complete) {
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return;
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}
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sigdata.signatures.insert(partial_sigs.begin(), partial_sigs.end());
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if (!redeem_script.empty()) {
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sigdata.redeem_script = redeem_script;
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}
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if (!witness_script.empty()) {
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sigdata.witness_script = witness_script;
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}
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for (const auto& key_pair : hd_keypaths) {
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sigdata.misc_pubkeys.emplace(key_pair.first.GetID(), key_pair);
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}
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}
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void PSBTInput::FromSignatureData(const SignatureData& sigdata)
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{
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if (sigdata.complete) {
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partial_sigs.clear();
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hd_keypaths.clear();
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redeem_script.clear();
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witness_script.clear();
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if (!sigdata.scriptSig.empty()) {
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final_script_sig = sigdata.scriptSig;
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}
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if (!sigdata.scriptWitness.IsNull()) {
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final_script_witness = sigdata.scriptWitness;
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}
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return;
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}
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partial_sigs.insert(sigdata.signatures.begin(), sigdata.signatures.end());
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if (redeem_script.empty() && !sigdata.redeem_script.empty()) {
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redeem_script = sigdata.redeem_script;
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}
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if (witness_script.empty() && !sigdata.witness_script.empty()) {
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witness_script = sigdata.witness_script;
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}
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for (const auto& entry : sigdata.misc_pubkeys) {
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hd_keypaths.emplace(entry.second);
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}
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}
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void PSBTInput::Merge(const PSBTInput& input)
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{
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if (!non_witness_utxo && input.non_witness_utxo) non_witness_utxo = input.non_witness_utxo;
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if (witness_utxo.IsNull() && !input.witness_utxo.IsNull()) {
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// TODO: For segwit v1, we will want to clear out the non-witness utxo when setting a witness one. For v0 and non-segwit, this is not safe
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witness_utxo = input.witness_utxo;
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}
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partial_sigs.insert(input.partial_sigs.begin(), input.partial_sigs.end());
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hd_keypaths.insert(input.hd_keypaths.begin(), input.hd_keypaths.end());
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unknown.insert(input.unknown.begin(), input.unknown.end());
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if (redeem_script.empty() && !input.redeem_script.empty()) redeem_script = input.redeem_script;
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if (witness_script.empty() && !input.witness_script.empty()) witness_script = input.witness_script;
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if (final_script_sig.empty() && !input.final_script_sig.empty()) final_script_sig = input.final_script_sig;
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if (final_script_witness.IsNull() && !input.final_script_witness.IsNull()) final_script_witness = input.final_script_witness;
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}
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void PSBTOutput::FillSignatureData(SignatureData& sigdata) const
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{
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if (!redeem_script.empty()) {
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sigdata.redeem_script = redeem_script;
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}
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if (!witness_script.empty()) {
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sigdata.witness_script = witness_script;
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}
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for (const auto& key_pair : hd_keypaths) {
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sigdata.misc_pubkeys.emplace(key_pair.first.GetID(), key_pair);
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}
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}
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void PSBTOutput::FromSignatureData(const SignatureData& sigdata)
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{
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if (redeem_script.empty() && !sigdata.redeem_script.empty()) {
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redeem_script = sigdata.redeem_script;
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}
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if (witness_script.empty() && !sigdata.witness_script.empty()) {
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witness_script = sigdata.witness_script;
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}
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for (const auto& entry : sigdata.misc_pubkeys) {
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hd_keypaths.emplace(entry.second);
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}
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}
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bool PSBTOutput::IsNull() const
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{
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return redeem_script.empty() && witness_script.empty() && hd_keypaths.empty() && unknown.empty();
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}
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void PSBTOutput::Merge(const PSBTOutput& output)
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{
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hd_keypaths.insert(output.hd_keypaths.begin(), output.hd_keypaths.end());
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unknown.insert(output.unknown.begin(), output.unknown.end());
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if (redeem_script.empty() && !output.redeem_script.empty()) redeem_script = output.redeem_script;
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if (witness_script.empty() && !output.witness_script.empty()) witness_script = output.witness_script;
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}
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bool PSBTInputSigned(const PSBTInput& input)
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{
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return !input.final_script_sig.empty() || !input.final_script_witness.IsNull();
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}
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size_t CountPSBTUnsignedInputs(const PartiallySignedTransaction& psbt) {
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size_t count = 0;
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for (const auto& input : psbt.inputs) {
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if (!PSBTInputSigned(input)) {
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count++;
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}
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}
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return count;
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}
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void UpdatePSBTOutput(const SigningProvider& provider, PartiallySignedTransaction& psbt, int index)
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{
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const CTxOut& out = psbt.tx->vout.at(index);
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PSBTOutput& psbt_out = psbt.outputs.at(index);
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// Fill a SignatureData with output info
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SignatureData sigdata;
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psbt_out.FillSignatureData(sigdata);
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// Construct a would-be spend of this output, to update sigdata with.
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// Note that ProduceSignature is used to fill in metadata (not actual signatures),
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// so provider does not need to provide any private keys (it can be a HidingSigningProvider).
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MutableTransactionSignatureCreator creator(psbt.tx.get_ptr(), /* index */ 0, out.nValue, SIGHASH_ALL);
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ProduceSignature(provider, creator, out.scriptPubKey, sigdata);
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// Put redeem_script, witness_script, key paths, into PSBTOutput.
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psbt_out.FromSignatureData(sigdata);
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}
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bool SignPSBTInput(const SigningProvider& provider, PartiallySignedTransaction& psbt, int index, int sighash, SignatureData* out_sigdata, bool use_dummy)
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{
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PSBTInput& input = psbt.inputs.at(index);
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const CMutableTransaction& tx = *psbt.tx;
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if (PSBTInputSigned(input)) {
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return true;
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}
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// Fill SignatureData with input info
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SignatureData sigdata;
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input.FillSignatureData(sigdata);
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// Get UTXO
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bool require_witness_sig = false;
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CTxOut utxo;
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if (input.non_witness_utxo) {
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// If we're taking our information from a non-witness UTXO, verify that it matches the prevout.
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COutPoint prevout = tx.vin[index].prevout;
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if (prevout.n >= input.non_witness_utxo->vout.size()) {
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return false;
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}
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if (input.non_witness_utxo->GetHash() != prevout.hash) {
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return false;
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}
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utxo = input.non_witness_utxo->vout[prevout.n];
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} else if (!input.witness_utxo.IsNull()) {
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utxo = input.witness_utxo;
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// When we're taking our information from a witness UTXO, we can't verify it is actually data from
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// the output being spent. This is safe in case a witness signature is produced (which includes this
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// information directly in the hash), but not for non-witness signatures. Remember that we require
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// a witness signature in this situation.
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require_witness_sig = true;
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} else {
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return false;
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}
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sigdata.witness = false;
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bool sig_complete;
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if (use_dummy) {
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sig_complete = ProduceSignature(provider, DUMMY_SIGNATURE_CREATOR, utxo.scriptPubKey, sigdata);
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} else {
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MutableTransactionSignatureCreator creator(&tx, index, utxo.nValue, sighash);
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sig_complete = ProduceSignature(provider, creator, utxo.scriptPubKey, sigdata);
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}
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// Verify that a witness signature was produced in case one was required.
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if (require_witness_sig && !sigdata.witness) return false;
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input.FromSignatureData(sigdata);
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// If we have a witness signature, put a witness UTXO.
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// TODO: For segwit v1, we should remove the non_witness_utxo
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if (sigdata.witness) {
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input.witness_utxo = utxo;
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// input.non_witness_utxo = nullptr;
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}
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// Fill in the missing info
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if (out_sigdata) {
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out_sigdata->missing_pubkeys = sigdata.missing_pubkeys;
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out_sigdata->missing_sigs = sigdata.missing_sigs;
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out_sigdata->missing_redeem_script = sigdata.missing_redeem_script;
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out_sigdata->missing_witness_script = sigdata.missing_witness_script;
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}
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return sig_complete;
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}
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bool FinalizePSBT(PartiallySignedTransaction& psbtx)
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{
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// Finalize input signatures -- in case we have partial signatures that add up to a complete
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// signature, but have not combined them yet (e.g. because the combiner that created this
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// PartiallySignedTransaction did not understand them), this will combine them into a final
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// script.
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bool complete = true;
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for (unsigned int i = 0; i < psbtx.tx->vin.size(); ++i) {
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complete &= SignPSBTInput(DUMMY_SIGNING_PROVIDER, psbtx, i, SIGHASH_ALL);
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}
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return complete;
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}
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bool FinalizeAndExtractPSBT(PartiallySignedTransaction& psbtx, CMutableTransaction& result)
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{
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// It's not safe to extract a PSBT that isn't finalized, and there's no easy way to check
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// whether a PSBT is finalized without finalizing it, so we just do this.
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if (!FinalizePSBT(psbtx)) {
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return false;
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}
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result = *psbtx.tx;
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for (unsigned int i = 0; i < result.vin.size(); ++i) {
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result.vin[i].scriptSig = psbtx.inputs[i].final_script_sig;
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result.vin[i].scriptWitness = psbtx.inputs[i].final_script_witness;
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}
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return true;
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}
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TransactionError CombinePSBTs(PartiallySignedTransaction& out, const std::vector<PartiallySignedTransaction>& psbtxs)
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{
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out = psbtxs[0]; // Copy the first one
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// Merge
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for (auto it = std::next(psbtxs.begin()); it != psbtxs.end(); ++it) {
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if (!out.Merge(*it)) {
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return TransactionError::PSBT_MISMATCH;
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}
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}
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return TransactionError::OK;
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}
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std::string PSBTRoleName(PSBTRole role) {
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switch (role) {
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case PSBTRole::CREATOR: return "creator";
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case PSBTRole::UPDATER: return "updater";
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case PSBTRole::SIGNER: return "signer";
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case PSBTRole::FINALIZER: return "finalizer";
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case PSBTRole::EXTRACTOR: return "extractor";
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// no default case, so the compiler can warn about missing cases
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}
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assert(false);
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}
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bool DecodeBase64PSBT(PartiallySignedTransaction& psbt, const std::string& base64_tx, std::string& error)
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{
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bool invalid;
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std::string tx_data = DecodeBase64(base64_tx, &invalid);
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if (invalid) {
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error = "invalid base64";
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return false;
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}
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return DecodeRawPSBT(psbt, tx_data, error);
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}
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bool DecodeRawPSBT(PartiallySignedTransaction& psbt, const std::string& tx_data, std::string& error)
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{
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CDataStream ss_data(tx_data.data(), tx_data.data() + tx_data.size(), SER_NETWORK, PROTOCOL_VERSION);
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try {
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ss_data >> psbt;
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if (!ss_data.empty()) {
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error = "extra data after PSBT";
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return false;
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}
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} catch (const std::exception& e) {
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error = e.what();
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return false;
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}
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return true;
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}
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