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script/sign: avoid duplicated signature verification after signing

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`ProduceSignature` already calls `VerifyScript` internally as last step in
order to check whether the signature data is complete. If and only if that is
the case, the `complete` field of the `SignatureData` is set accordingly and
there is no need then to verify the script after again, as we already know that
it would succeed.

This leads to a rough ~20% speed-up for `SignTransaction` for single-input
ECDSA or Taproot inputs, according to the `SignTransaction{ECDSA,Taproot}`
benchmarks.
This commit is contained in:
Sebastian Falbesoner 2023-11-21 16:47:35 +01:00
parent 080089567c
commit fe92c15f0c
1 changed files with 1 additions and 1 deletions
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2
src/script/sign.cpp
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@ -831,7 +831,7 @@ bool SignTransaction(CMutableTransaction& mtx, const SigningProvider* keystore,
}
ScriptError serror = SCRIPT_ERR_OK;
if (!VerifyScript(txin.scriptSig, prevPubKey, &txin.scriptWitness, STANDARD_SCRIPT_VERIFY_FLAGS, TransactionSignatureChecker(&txConst, i, amount, txdata, MissingDataBehavior::FAIL), &serror)) {
if (!sigdata.complete && !VerifyScript(txin.scriptSig, prevPubKey, &txin.scriptWitness, STANDARD_SCRIPT_VERIFY_FLAGS, TransactionSignatureChecker(&txConst, i, amount, txdata, MissingDataBehavior::FAIL), &serror)) {
if (serror == SCRIPT_ERR_INVALID_STACK_OPERATION) {
// Unable to sign input and verification failed (possible attempt to partially sign).
input_errors[i] = Untranslated("Unable to sign input, invalid stack size (possibly missing key)");