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psbt: Enforce sighash type of signatures matches psbt

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BIP 174 states that the sighash type of all signatures must match the
type given by the PSBT, so do that.
This commit is contained in:
Ava Chow
2025-03-04 09:05:42 -08:00
parent 1f71cd337a
commit 15ce1bd73f
1 changed files with 20 additions and 0 deletions
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20
src/psbt.cpp
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@@ -425,6 +425,26 @@ PSBTError SignPSBTInput(const SigningProvider& provider, PartiallySignedTransact
return PSBTError::SIGHASH_MISMATCH;
}
// Check all existing signatures use the sighash type
if (sighash == SIGHASH_DEFAULT) {
if (!input.m_tap_key_sig.empty() && input.m_tap_key_sig.size() != 64) {
return PSBTError::SIGHASH_MISMATCH;
}
for (const auto& [_, sig] : input.m_tap_script_sigs) {
if (sig.size() != 64) return PSBTError::SIGHASH_MISMATCH;
}
} else {
if (!input.m_tap_key_sig.empty() && (input.m_tap_key_sig.size() != 65 || input.m_tap_key_sig.back() != *sighash)) {
return PSBTError::SIGHASH_MISMATCH;
}
for (const auto& [_, sig] : input.m_tap_script_sigs) {
if (sig.size() != 65 || sig.back() != *sighash) return PSBTError::SIGHASH_MISMATCH;
}
for (const auto& [_, sig] : input.partial_sigs) {
if (sig.second.back() != *sighash) return PSBTError::SIGHASH_MISMATCH;
}
}
sigdata.witness = false;
bool sig_complete;
if (txdata == nullptr) {