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psbt: Include output pubkey in additional pubkeys to sign

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In addition to the pubkeys in hd_keypaths and tap_bip32_keypaths, also
see if the descriptor can produce a SigningProvider for the output
pubkey.

Also slightly refactors this area to reduce code duplication.

Github-Pull: #26418
Rebased-From: 8781a1b6bb
This commit is contained in:
Andrew Chow 2022-10-28 20:00:58 -04:00 • committed by fanquake
parent 754eefd21c
commit 2159676b6e
No known key found for this signature in database
GPG key ID: 2EEB9F5CC09526C1
1 changed files with 24 additions and 11 deletions
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35
src/wallet/scriptpubkeyman.cpp
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@ -2499,14 +2499,23 @@ TransactionError DescriptorScriptPubKeyMan::FillPSBT(PartiallySignedTransaction&
keys->Merge(std::move(*script_keys));
} else {
// Maybe there are pubkeys listed that we can sign for
script_keys = std::make_unique<FlatSigningProvider>();
for (const auto& pk_pair : input.hd_keypaths) {
const CPubKey& pubkey = pk_pair.first;
std::unique_ptr<FlatSigningProvider> pk_keys = GetSigningProvider(pubkey);
if (pk_keys) {
keys->Merge(std::move(*pk_keys));
}
std::vector<CPubKey> pubkeys;
// ECDSA Pubkeys
for (const auto& [pk, _] : input.hd_keypaths) {
pubkeys.push_back(pk);
}
// Taproot output pubkey
std::vector<std::vector<unsigned char>> sols;
if (Solver(script, sols) == TxoutType::WITNESS_V1_TAPROOT) {
sols[0].insert(sols[0].begin(), 0x02);
pubkeys.emplace_back(sols[0]);
sols[0][0] = 0x03;
pubkeys.emplace_back(sols[0]);
}
// Taproot pubkeys
for (const auto& pk_pair : input.m_tap_bip32_paths) {
const XOnlyPubKey& pubkey = pk_pair.first;
for (unsigned char prefix : {0x02, 0x03}) {
@ -2514,10 +2523,14 @@ TransactionError DescriptorScriptPubKeyMan::FillPSBT(PartiallySignedTransaction&
std::copy(pubkey.begin(), pubkey.end(), b + 1);
CPubKey fullpubkey;
fullpubkey.Set(b, b + 33);
std::unique_ptr<FlatSigningProvider> pk_keys = GetSigningProvider(fullpubkey);
if (pk_keys) {
keys->Merge(std::move(*pk_keys));
}
pubkeys.push_back(fullpubkey);
}
}
for (const auto& pubkey : pubkeys) {
std::unique_ptr<FlatSigningProvider> pk_keys = GetSigningProvider(pubkey);
if (pk_keys) {
keys->Merge(std::move(*pk_keys));
}
}
}