Function MutateTxSign

src/bitcoin-tx.cpp:577–694

}

static void MutateTxSign(CMutableTransaction& tx, const std::string& flagStr)
{
    int nHashType = SIGHASH_ALL;

    if (flagStr.size() > 0)
        if (!findSighashFlags(nHashType, flagStr))
            throw std::runtime_error("unknown sighash flag/sign option");

    // mergedTx will end up with all the signatures; it
    // starts as a clone of the raw tx:
    CMutableTransaction mergedTx{tx};
    const CMutableTransaction txv{tx};
    CCoinsViewCache view{&CoinsViewEmpty::Get()};

    if (!registers.contains("privatekeys"))
        throw std::runtime_error("privatekeys register variable must be set.");
    FillableSigningProvider tempKeystore;
    UniValue keysObj = registers["privatekeys"];

    for (unsigned int kidx = 0; kidx < keysObj.size(); kidx++) {
        if (!keysObj[kidx].isStr())
            throw std::runtime_error("privatekey not a std::string");
        CKey key = DecodeSecret(keysObj[kidx].getValStr());
        if (!key.IsValid()) {
            throw std::runtime_error("privatekey not valid");
        }
        tempKeystore.AddKey(key);
    }

    // Add previous txouts given in the RPC call:
    if (!registers.contains("prevtxs"))
        throw std::runtime_error("prevtxs register variable must be set.");
    UniValue prevtxsObj = registers["prevtxs"];
    {
        for (unsigned int previdx = 0; previdx < prevtxsObj.size(); previdx++) {
            const UniValue& prevOut = prevtxsObj[previdx];
            if (!prevOut.isObject())
                throw std::runtime_error("expected prevtxs internal object");

            std::map<std::string, UniValue::VType> types = {
                {"txid", UniValue::VSTR},
                {"vout", UniValue::VNUM},
                {"scriptPubKey", UniValue::VSTR},
            };
            if (!prevOut.checkObject(types))
                throw std::runtime_error("prevtxs internal object typecheck fail");

            auto txid{Txid::FromHex(prevOut["txid"].get_str())};
            if (!txid) {
                throw std::runtime_error("txid must be hexadecimal string (not '" + prevOut["txid"].get_str() + "')");
            }

            const int nOut = prevOut["vout"].getInt<int>();
            if (nOut < 0)
                throw std::runtime_error("vout cannot be negative");

            COutPoint out(*txid, nOut);
            std::vector<unsigned char> pkData(ParseHexUV(prevOut["scriptPubKey"], "scriptPubKey"));