Function ProduceSignature

src/script/sign.cpp:198–233

}

bool ProduceSignature(const SigningProvider &provider,
                      const BaseSignatureCreator &creator,
                      const CScript &fromPubKey, SignatureData &sigdata) {
    if (sigdata.complete) {
        return true;
    }

    std::vector<valtype> result;
    TxoutType whichType;
    bool solved =
        SignStep(provider, creator, fromPubKey, result, whichType, sigdata);
    CScript subscript;

    if (solved && whichType == TxoutType::SCRIPTHASH) {
        // Solver returns the subscript that needs to be evaluated; the final
        // scriptSig is the signatures from that and then the serialized
        // subscript:
        subscript = CScript(result[0].begin(), result[0].end());
        sigdata.redeem_script = subscript;

        solved = solved &&
                 SignStep(provider, creator, subscript, result, whichType,
                          sigdata) &&
                 whichType != TxoutType::SCRIPTHASH;
        result.push_back(
            std::vector<uint8_t>(subscript.begin(), subscript.end()));
    }

    sigdata.scriptSig = PushAll(result);

    // Test solution
    sigdata.complete =
        solved && VerifyScript(sigdata.scriptSig, fromPubKey,
                               STANDARD_SCRIPT_VERIFY_FLAGS, creator.Checker());
    return sigdata.complete;
}

namespace {
class SignatureExtractorChecker final : public BaseSignatureChecker {