produce_signature_p2sh.cpp

    const CScript redeemScript = std::get<0>(spk_keys);
    const std::vector<CKey> keys = std::get<1>(spk_keys);
    //hash the spk 
    const CScript p2sh = GetScriptForDestination(CScriptID(redeemScript)); 
    //return sign(std::make_tuple(p2sh,keys));
    const int inputIndex = 0;
    //const CScript spk = std::get<0>(spk_keys); 
    //const std::vector<CKey> keys = std::get<1>(spk_keys);
    CBasicKeyStore store;
    for (const auto k: keys) { 
      store.AddKey(k);
    }
    //add redeem script
    store.AddCScript(redeemScript);
    CMutableTransaction creditingTx = BuildCreditingTransaction(p2sh);
    CMutableTransaction spendingTx = BuildSpendingTransaction(CScript(), CScriptWitness(), creditingTx);
    CTransaction spendingTxConst(spendingTx); 
    SignatureData sigdata;
    TransactionSignatureCreator creator(&store,&spendingTxConst,inputIndex,0);
    assert(ProduceSignature(creator, p2sh, sigdata));
    UpdateTransaction(spendingTx,0,sigdata);
    const CTxOut output(0,p2sh);
    const CTransaction finalTx = CTransaction(spendingTx);
    SpendingInfo tup = std::make_tuple(output,finalTx,inputIndex);
    return tup;