Function SignPSBTInput

src/psbt.cpp:634–720

}

bool SignPSBTInput(const SigningProvider& provider, PartiallySignedTransaction& psbt, int index, const PrecomputedTransactionData* txdata, int sighash,  SignatureData* out_sigdata, bool finalize)
{
    PSBTInput& input = psbt.inputs.at(index);

    // If this input is a peg-in, also make the peg-in witness
    if (input.m_peg_in_tx.index() != 0
        && input.m_peg_in_txout_proof.index() != 0
        && !input.m_peg_in_claim_script.empty()
        && !input.m_peg_in_genesis_hash.IsNull()
        && input.m_peg_in_value != std::nullopt) {
        if (Params().GetConsensus().ParentChainHasPow()) {
            input.m_peg_in_witness = CreatePeginWitness(*input.m_peg_in_value, Params().GetConsensus().pegged_asset, input.m_peg_in_genesis_hash, input.m_peg_in_claim_script, *std::get_if<Sidechain::Bitcoin::CTransactionRef>(&input.m_peg_in_tx), *std::get_if<Sidechain::Bitcoin::CMerkleBlock>(&input.m_peg_in_txout_proof));
        } else {
            input.m_peg_in_witness = CreatePeginWitness(*input.m_peg_in_value, Params().GetConsensus().pegged_asset, input.m_peg_in_genesis_hash, input.m_peg_in_claim_script, *std::get_if<CTransactionRef>(&input.m_peg_in_tx), *std::get_if<CMerkleBlock>(&input.m_peg_in_txout_proof));
        }
    }

    const CMutableTransaction& tx = psbt.GetUnsignedTx();

    if (PSBTInputSigned(input)) {
        return true;
    }

    // Fill SignatureData with input info
    SignatureData sigdata;
    input.FillSignatureData(sigdata);

    // Get UTXO
    bool require_witness_sig = false;
    CTxOut utxo;

    if (input.non_witness_utxo) {
        // If we're taking our information from a non-witness UTXO, verify that it matches the prevout.
        COutPoint prevout = input.GetOutPoint();
        if (prevout.n >= input.non_witness_utxo->vout.size()) {
            return false;
        }
        if (input.non_witness_utxo->GetHash() != prevout.hash) {
            return false;
        }
        utxo = input.non_witness_utxo->vout[prevout.n];
    } else if (!input.witness_utxo.IsNull()) {
        utxo = input.witness_utxo;
        // When we're taking our information from a witness UTXO, we can't verify it is actually data from
        // the output being spent. This is safe in case a witness signature is produced (which includes this
        // information directly in the hash), but not for non-witness signatures. Remember that we require
        // a witness signature in this situation.
        require_witness_sig = true;
    } else if (input.m_peg_in_value && !input.m_peg_in_claim_script.empty()) {
        utxo = CTxOut(Params().GetConsensus().pegged_asset, CConfidentialValue(*input.m_peg_in_value), input.m_peg_in_claim_script);
    } else {
        return false;
    }

    sigdata.witness = false;
    bool sig_complete;
    if (txdata == nullptr) {
        sig_complete = ProduceSignature(provider, DUMMY_SIGNATURE_CREATOR, utxo.scriptPubKey, sigdata);