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Merge bitcoin/bitcoin#21365: Basic Taproot signing support for descriptor wallets

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458a345b05 Add support for SIGHASH_DEFAULT in RPCs, and make it default (Pieter Wuille)
c0f0c8eccb tests: check spending of P2TR (Pieter Wuille)
a2380127e9 Basic Taproot signing logic in script/sign.cpp (Pieter Wuille)
49487bc3b6 Make GetInputUTXO safer: verify non-witness UTXO match (Pieter Wuille)
fd3f6890f3 Construct and use PrecomputedTransactionData in PSBT signing (Pieter Wuille)
5cb6502ac5 Construct and use PrecomputedTransactionData in SignTransaction (Pieter Wuille)
5d2e22437b Don't nuke witness data when signing fails (Pieter Wuille)
ce9353164b Permit full precomputation in PrecomputedTransactionData (Pieter Wuille)
e841fb503d Add precomputed txdata support to MutableTransactionSignatureCreator (Pieter Wuille)
a91d532338 Add CKey::SignSchnorr function for BIP 340/341 signing (Pieter Wuille)
e77a2839b5 Use HandleMissingData also in CheckSchnorrSignature (Pieter Wuille)
dbb0ce9fbf Add TaprootSpendData data structure, equivalent to script map for P2[W]SH (Pieter Wuille)

Pull request description:

  Builds on top of #22051, adding signing support after derivation support.

  Nothing is changed in descriptor features. Signing works for key path and script path spending, through the normal sending functions, and PSBT-based RPCs. However, PSBT usability is rather low as no extensions have been defined to convey Taproot-specific information, so all script information must be known to the signing wallet.

ACKs for top commit:
  achow101:
    re-ACK 458a345b05
  fjahr:
    Code review ACK 458a345b05
  Sjors:
    ACK 458a345b05

Tree-SHA512: 30ed212cf7754763a4a81624ebc084c51727b8322711ac0b390369213c1a891d367ed8b123882ac08c99595320c11ec57ee42304ff22a69afdc3d1a0d55cc711
This commit is contained in:
Samuel Dobson
2021-06-18 08:38:04 +12:00
parent 8cb43077b3 458a345b05
commit 5c2e2afe99
28 changed files with 594 additions and 65 deletions
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6
src/node/psbt.cpp
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@@ -23,6 +23,8 @@ PSBTAnalysis AnalyzePSBT(PartiallySignedTransaction psbtx)
result.inputs.resize(psbtx.tx->vin.size());
const PrecomputedTransactionData txdata = PrecomputePSBTData(psbtx);
for (unsigned int i = 0; i < psbtx.tx->vin.size(); ++i) {
PSBTInput& input = psbtx.inputs[i];
PSBTInputAnalysis& input_analysis = result.inputs[i];
@@ -61,7 +63,7 @@ PSBTAnalysis AnalyzePSBT(PartiallySignedTransaction psbtx)
// Figure out what is missing
SignatureData outdata;
bool complete = SignPSBTInput(DUMMY_SIGNING_PROVIDER, psbtx, i, 1, &outdata);
bool complete = SignPSBTInput(DUMMY_SIGNING_PROVIDER, psbtx, i, &txdata, 1, &outdata);
// Things are missing
if (!complete) {
@@ -121,7 +123,7 @@ PSBTAnalysis AnalyzePSBT(PartiallySignedTransaction psbtx)
PSBTInput& input = psbtx.inputs[i];
Coin newcoin;
if (!SignPSBTInput(DUMMY_SIGNING_PROVIDER, psbtx, i, 1, nullptr, true) || !psbtx.GetInputUTXO(newcoin.out, i)) {
if (!SignPSBTInput(DUMMY_SIGNING_PROVIDER, psbtx, i, nullptr, 1) || !psbtx.GetInputUTXO(newcoin.out, i)) {
success = false;
break;
} else {