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Merge bitcoin/bitcoin#22513: rpc: Allow walletprocesspsbt to sign without finalizing

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a99ed89865 psbt: sign without finalizing (Andrew Chow)

Pull request description:

  It can be useful to sign an input with `walletprocesspsbt` but not finalize that input if it is complete. This PR adds another option to `walletprocesspsbt` to be able to do that. We will still finalize by default.

  This does not materially change the PSBT workflow since `finalizepsbt` needs to be called in order to extract the tx for broadcast.

ACKs for top commit:
  meshcollider:
    utACK a99ed89865
  Sjors:
    utACK a99ed89

Tree-SHA512: c88e5d3222109c5f4e763b1b9d97ce4655f68f2985a4509caab2d4e7f5bac5047328fd69696e82a330f5c5a333e0312568ae293515689b77a4747ca2f17caca6
This commit is contained in:
W. J. van der Laan
2021-11-29 17:13:06 +01:00
parent 913b7148a2 a99ed89865
commit 383d350bd5
11 changed files with 32 additions and 20 deletions
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8
src/psbt.cpp
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@@ -247,7 +247,7 @@ PrecomputedTransactionData PrecomputePSBTData(const PartiallySignedTransaction&
return txdata;
}
bool SignPSBTInput(const SigningProvider& provider, PartiallySignedTransaction& psbt, int index, const PrecomputedTransactionData* txdata, int sighash, SignatureData* out_sigdata)
bool SignPSBTInput(const SigningProvider& provider, PartiallySignedTransaction& psbt, int index, const PrecomputedTransactionData* txdata, int sighash, SignatureData* out_sigdata, bool finalize)
{
PSBTInput& input = psbt.inputs.at(index);
const CMutableTransaction& tx = *psbt.tx;
@@ -295,6 +295,10 @@ bool SignPSBTInput(const SigningProvider& provider, PartiallySignedTransaction&
}
// 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.
@@ -324,7 +328,7 @@ bool FinalizePSBT(PartiallySignedTransaction& psbtx)
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);
complete &= SignPSBTInput(DUMMY_SIGNING_PROVIDER, psbtx, i, &txdata, SIGHASH_ALL, nullptr, true);
}
return complete;