Function EvalChecksigPreTapscript

src/script/interpreter.cpp:331–355

}

static bool EvalChecksigPreTapscript(const valtype& vchSig, const valtype& vchPubKey, CScript::const_iterator pbegincodehash, CScript::const_iterator pend, script_verify_flags flags, const BaseSignatureChecker& checker, SigVersion sigversion, ScriptError* serror, bool& fSuccess)
{
    assert(sigversion == SigVersion::BASE || sigversion == SigVersion::WITNESS_V0);

    // Subset of script starting at the most recent codeseparator
    CScript scriptCode(pbegincodehash, pend);

    // Drop the signature in pre-segwit scripts but not segwit scripts
    if (sigversion == SigVersion::BASE) {
        int found = FindAndDelete(scriptCode, CScript() << vchSig);
        if (found > 0 && (flags & SCRIPT_VERIFY_CONST_SCRIPTCODE))
            return set_error(serror, SCRIPT_ERR_SIG_FINDANDDELETE);
    }

    if (!CheckSignatureEncoding(vchSig, flags, serror) || !CheckPubKeyEncoding(vchPubKey, flags, sigversion, serror)) {
        //serror is set
        return false;
    }
    fSuccess = checker.CheckECDSASignature(vchSig, vchPubKey, scriptCode, sigversion);

    if (!fSuccess && (flags & SCRIPT_VERIFY_NULLFAIL) && vchSig.size())
        return set_error(serror, SCRIPT_ERR_SIG_NULLFAIL);

    return true;
}

static bool EvalChecksigTapscript(const valtype& sig, const valtype& pubkey, ScriptExecutionData& execdata, script_verify_flags flags, const BaseSignatureChecker& checker, SigVersion sigversion, ScriptError* serror, bool& success)
{