mirror of https://github.com/bitcoin/bitcoin
569 lines
21 KiB
C++
569 lines
21 KiB
C++
// Copyright (c) 2009-2022 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 <policy/policy.h>
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#include <script/signingprovider.h>
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#include <util/check.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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for (auto& xpub_pair : psbt.m_xpubs) {
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if (m_xpubs.count(xpub_pair.first) == 0) {
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m_xpubs[xpub_pair.first] = xpub_pair.second;
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} else {
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m_xpubs[xpub_pair.first].insert(xpub_pair.second.begin(), xpub_pair.second.end());
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}
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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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const 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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if (input.non_witness_utxo->GetHash() != tx->vin[input_index].prevout.hash) {
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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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if (!m_tap_key_sig.empty()) {
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sigdata.taproot_key_path_sig = m_tap_key_sig;
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}
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for (const auto& [pubkey_leaf, sig] : m_tap_script_sigs) {
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sigdata.taproot_script_sigs.emplace(pubkey_leaf, sig);
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}
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if (!m_tap_internal_key.IsNull()) {
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sigdata.tr_spenddata.internal_key = m_tap_internal_key;
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}
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if (!m_tap_merkle_root.IsNull()) {
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sigdata.tr_spenddata.merkle_root = m_tap_merkle_root;
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}
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for (const auto& [leaf_script, control_block] : m_tap_scripts) {
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sigdata.tr_spenddata.scripts.emplace(leaf_script, control_block);
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}
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for (const auto& [pubkey, leaf_origin] : m_tap_bip32_paths) {
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sigdata.taproot_misc_pubkeys.emplace(pubkey, leaf_origin);
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sigdata.tap_pubkeys.emplace(Hash160(pubkey), pubkey);
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}
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for (const auto& [hash, preimage] : ripemd160_preimages) {
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sigdata.ripemd160_preimages.emplace(std::vector<unsigned char>(hash.begin(), hash.end()), preimage);
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}
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for (const auto& [hash, preimage] : sha256_preimages) {
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sigdata.sha256_preimages.emplace(std::vector<unsigned char>(hash.begin(), hash.end()), preimage);
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}
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for (const auto& [hash, preimage] : hash160_preimages) {
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sigdata.hash160_preimages.emplace(std::vector<unsigned char>(hash.begin(), hash.end()), preimage);
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}
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for (const auto& [hash, preimage] : hash256_preimages) {
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sigdata.hash256_preimages.emplace(std::vector<unsigned char>(hash.begin(), hash.end()), preimage);
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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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if (!sigdata.taproot_key_path_sig.empty()) {
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m_tap_key_sig = sigdata.taproot_key_path_sig;
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}
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for (const auto& [pubkey_leaf, sig] : sigdata.taproot_script_sigs) {
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m_tap_script_sigs.emplace(pubkey_leaf, sig);
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}
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if (!sigdata.tr_spenddata.internal_key.IsNull()) {
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m_tap_internal_key = sigdata.tr_spenddata.internal_key;
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}
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if (!sigdata.tr_spenddata.merkle_root.IsNull()) {
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m_tap_merkle_root = sigdata.tr_spenddata.merkle_root;
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}
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for (const auto& [leaf_script, control_block] : sigdata.tr_spenddata.scripts) {
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m_tap_scripts.emplace(leaf_script, control_block);
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}
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for (const auto& [pubkey, leaf_origin] : sigdata.taproot_misc_pubkeys) {
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m_tap_bip32_paths.emplace(pubkey, leaf_origin);
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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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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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ripemd160_preimages.insert(input.ripemd160_preimages.begin(), input.ripemd160_preimages.end());
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sha256_preimages.insert(input.sha256_preimages.begin(), input.sha256_preimages.end());
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hash160_preimages.insert(input.hash160_preimages.begin(), input.hash160_preimages.end());
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hash256_preimages.insert(input.hash256_preimages.begin(), input.hash256_preimages.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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m_tap_script_sigs.insert(input.m_tap_script_sigs.begin(), input.m_tap_script_sigs.end());
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m_tap_scripts.insert(input.m_tap_scripts.begin(), input.m_tap_scripts.end());
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m_tap_bip32_paths.insert(input.m_tap_bip32_paths.begin(), input.m_tap_bip32_paths.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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if (m_tap_key_sig.empty() && !input.m_tap_key_sig.empty()) m_tap_key_sig = input.m_tap_key_sig;
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if (m_tap_internal_key.IsNull() && !input.m_tap_internal_key.IsNull()) m_tap_internal_key = input.m_tap_internal_key;
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if (m_tap_merkle_root.IsNull() && !input.m_tap_merkle_root.IsNull()) m_tap_merkle_root = input.m_tap_merkle_root;
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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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if (!m_tap_tree.empty() && m_tap_internal_key.IsFullyValid()) {
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TaprootBuilder builder;
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for (const auto& [depth, leaf_ver, script] : m_tap_tree) {
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builder.Add((int)depth, script, (int)leaf_ver, /*track=*/true);
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}
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assert(builder.IsComplete());
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builder.Finalize(m_tap_internal_key);
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TaprootSpendData spenddata = builder.GetSpendData();
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sigdata.tr_spenddata.internal_key = m_tap_internal_key;
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sigdata.tr_spenddata.Merge(spenddata);
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}
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for (const auto& [pubkey, leaf_origin] : m_tap_bip32_paths) {
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sigdata.taproot_misc_pubkeys.emplace(pubkey, leaf_origin);
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sigdata.tap_pubkeys.emplace(Hash160(pubkey), pubkey);
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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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if (!sigdata.tr_spenddata.internal_key.IsNull()) {
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m_tap_internal_key = sigdata.tr_spenddata.internal_key;
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}
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if (sigdata.tr_builder.has_value() && sigdata.tr_builder->HasScripts()) {
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m_tap_tree = sigdata.tr_builder->GetTreeTuples();
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}
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for (const auto& [pubkey, leaf_origin] : sigdata.taproot_misc_pubkeys) {
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m_tap_bip32_paths.emplace(pubkey, leaf_origin);
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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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m_tap_bip32_paths.insert(output.m_tap_bip32_paths.begin(), output.m_tap_bip32_paths.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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if (m_tap_internal_key.IsNull() && !output.m_tap_internal_key.IsNull()) m_tap_internal_key = output.m_tap_internal_key;
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if (m_tap_tree.empty() && !output.m_tap_tree.empty()) m_tap_tree = output.m_tap_tree;
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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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bool PSBTInputSignedAndVerified(const PartiallySignedTransaction psbt, unsigned int input_index, const PrecomputedTransactionData* txdata)
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{
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CTxOut utxo;
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assert(psbt.inputs.size() >= input_index);
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const PSBTInput& input = psbt.inputs[input_index];
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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 = psbt.tx->vin[input_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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} else {
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return false;
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}
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if (txdata) {
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return VerifyScript(input.final_script_sig, utxo.scriptPubKey, &input.final_script_witness, STANDARD_SCRIPT_VERIFY_FLAGS, MutableTransactionSignatureChecker{&(*psbt.tx), input_index, utxo.nValue, *txdata, MissingDataBehavior::FAIL});
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} else {
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return VerifyScript(input.final_script_sig, utxo.scriptPubKey, &input.final_script_witness, STANDARD_SCRIPT_VERIFY_FLAGS, MutableTransactionSignatureChecker{&(*psbt.tx), input_index, utxo.nValue, MissingDataBehavior::FAIL});
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}
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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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CMutableTransaction& tx = *Assert(psbt.tx);
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const CTxOut& out = 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(tx, /*input_idx=*/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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PrecomputedTransactionData PrecomputePSBTData(const PartiallySignedTransaction& psbt)
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{
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const CMutableTransaction& tx = *psbt.tx;
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bool have_all_spent_outputs = true;
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std::vector<CTxOut> utxos(tx.vin.size());
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for (size_t idx = 0; idx < tx.vin.size(); ++idx) {
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if (!psbt.GetInputUTXO(utxos[idx], idx)) have_all_spent_outputs = false;
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}
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PrecomputedTransactionData txdata;
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if (have_all_spent_outputs) {
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txdata.Init(tx, std::move(utxos), true);
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} else {
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txdata.Init(tx, {}, true);
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}
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return txdata;
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}
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bool SignPSBTInput(const SigningProvider& provider, PartiallySignedTransaction& psbt, int index, const PrecomputedTransactionData* txdata, int sighash, SignatureData* out_sigdata, bool finalize)
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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 (PSBTInputSignedAndVerified(psbt, index, txdata)) {
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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 (txdata == nullptr) {
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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, txdata, 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;
|
|
|
|
// If we are not finalizing, set sigdata.complete to false to not set the scriptWitness
|
|
if (!finalize && sigdata.complete) sigdata.complete = false;
|
|
|
|
input.FromSignatureData(sigdata);
|
|
|
|
// If we have a witness signature, put a witness UTXO.
|
|
if (sigdata.witness) {
|
|
input.witness_utxo = utxo;
|
|
// We can remove the non_witness_utxo if and only if there are no non-segwit or segwit v0
|
|
// inputs in this transaction. Since this requires inspecting the entire transaction, this
|
|
// is something for the caller to deal with (i.e. FillPSBT).
|
|
}
|
|
|
|
// 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;
|
|
}
|
|
|
|
void RemoveUnnecessaryTransactions(PartiallySignedTransaction& psbtx, const int& sighash_type)
|
|
{
|
|
// Only drop non_witness_utxos if sighash_type != SIGHASH_ANYONECANPAY
|
|
if ((sighash_type & 0x80) != SIGHASH_ANYONECANPAY) {
|
|
// Figure out if any non_witness_utxos should be dropped
|
|
std::vector<unsigned int> to_drop;
|
|
for (unsigned int i = 0; i < psbtx.inputs.size(); ++i) {
|
|
const auto& input = psbtx.inputs.at(i);
|
|
int wit_ver;
|
|
std::vector<unsigned char> wit_prog;
|
|
if (input.witness_utxo.IsNull() || !input.witness_utxo.scriptPubKey.IsWitnessProgram(wit_ver, wit_prog)) {
|
|
// There's a non-segwit input or Segwit v0, so we cannot drop any witness_utxos
|
|
to_drop.clear();
|
|
break;
|
|
}
|
|
if (wit_ver == 0) {
|
|
// Segwit v0, so we cannot drop any non_witness_utxos
|
|
to_drop.clear();
|
|
break;
|
|
}
|
|
if (input.non_witness_utxo) {
|
|
to_drop.push_back(i);
|
|
}
|
|
}
|
|
|
|
// Drop the non_witness_utxos that we can drop
|
|
for (unsigned int i : to_drop) {
|
|
psbtx.inputs.at(i).non_witness_utxo = nullptr;
|
|
}
|
|
}
|
|
}
|
|
|
|
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;
|
|
const PrecomputedTransactionData txdata = PrecomputePSBTData(psbtx);
|
|
for (unsigned int i = 0; i < psbtx.tx->vin.size(); ++i) {
|
|
complete &= SignPSBTInput(DUMMY_SIGNING_PROVIDER, psbtx, i, &txdata, SIGHASH_ALL, nullptr, true);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
TransactionError CombinePSBTs(PartiallySignedTransaction& out, 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)) {
|
|
return TransactionError::PSBT_MISMATCH;
|
|
}
|
|
}
|
|
return TransactionError::OK;
|
|
}
|
|
|
|
std::string PSBTRoleName(PSBTRole role) {
|
|
switch (role) {
|
|
case PSBTRole::CREATOR: return "creator";
|
|
case PSBTRole::UPDATER: return "updater";
|
|
case PSBTRole::SIGNER: return "signer";
|
|
case PSBTRole::FINALIZER: return "finalizer";
|
|
case PSBTRole::EXTRACTOR: return "extractor";
|
|
// no default case, so the compiler can warn about missing cases
|
|
}
|
|
assert(false);
|
|
}
|
|
|
|
bool DecodeBase64PSBT(PartiallySignedTransaction& psbt, const std::string& base64_tx, std::string& error)
|
|
{
|
|
auto tx_data = DecodeBase64(base64_tx);
|
|
if (!tx_data) {
|
|
error = "invalid base64";
|
|
return false;
|
|
}
|
|
return DecodeRawPSBT(psbt, MakeByteSpan(*tx_data), error);
|
|
}
|
|
|
|
bool DecodeRawPSBT(PartiallySignedTransaction& psbt, Span<const std::byte> tx_data, std::string& error)
|
|
{
|
|
DataStream ss_data{tx_data};
|
|
try {
|
|
ss_data >> psbt;
|
|
if (!ss_data.empty()) {
|
|
error = "extra data after PSBT";
|
|
return false;
|
|
}
|
|
} catch (const std::exception& e) {
|
|
error = e.what();
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
uint32_t PartiallySignedTransaction::GetVersion() const
|
|
{
|
|
if (m_version != std::nullopt) {
|
|
return *m_version;
|
|
}
|
|
return 0;
|
|
}
|