void MultisigDialog::on_signTransactionButton_clicked()
{
ui->signedTransaction->clear();
if(!model)
return;
CWallet *wallet = model->getWallet();
// Decode the raw transaction
std::vector<unsigned char> txData(ParseHex(ui->transaction->text().toStdString()));
CDataStream ss(txData, SER_NETWORK, PROTOCOL_VERSION);
CTransaction tx;
try
{
ss >> tx;
}
catch(std::exception &e)
{
(void)e;
return;
}
CTransaction mergedTx(tx);
// Fetch previous transactions (inputs)
std::map<COutPoint, CScript> mapPrevOut;
for(unsigned int i = 0; i < mergedTx.vin.size(); i++)
{
CTransaction tempTx;
MapPrevTx mapPrevTx;
CTxDB txdb("r");
std::map<uint256, CTxIndex> unused;
bool fInvalid;
tempTx.vin.push_back(mergedTx.vin[i]);
tempTx.FetchInputs(txdb, unused, false, false, mapPrevTx, fInvalid);
BOOST_FOREACH(const CTxIn& txin, tempTx.vin)
{
const uint256& prevHash = txin.prevout.hash;
if(mapPrevTx.count(prevHash) && mapPrevTx[prevHash].second.vout.size() > txin.prevout.n)
mapPrevOut[txin.prevout] = mapPrevTx[prevHash].second.vout[txin.prevout.n].scriptPubKey;
}
}
// Add the redeem scripts to the wallet keystore
for(int i = 0; i < ui->inputs->count(); i++)
{
MultisigInputEntry *entry = qobject_cast<MultisigInputEntry *>(ui->inputs->itemAt(i)->widget());
if(entry)
{
QString redeemScriptStr = entry->getRedeemScript();
if(redeemScriptStr.size() > 0)
{
std::vector<unsigned char> scriptData(ParseHex(redeemScriptStr.toStdString()));
CScript redeemScript(scriptData.begin(), scriptData.end());
wallet->AddCScript(redeemScript);
}
}
}
WalletModel::UnlockContext ctx(model->requestUnlock());
if(!ctx.isValid())
return;
// Sign what we can
bool fComplete = true;
for(unsigned int i = 0; i < mergedTx.vin.size(); i++)
{
CTxIn& txin = mergedTx.vin[i];
if(mapPrevOut.count(txin.prevout) == 0)
{
fComplete = false;
continue;
}
const CScript& prevPubKey = mapPrevOut[txin.prevout];
txin.scriptSig.clear();
SignSignature(*wallet, prevPubKey, mergedTx, i, SIGHASH_ALL);
txin.scriptSig = CombineSignatures(prevPubKey, mergedTx, i, txin.scriptSig, tx.vin[i].scriptSig);
if(!VerifyScript(txin.scriptSig, prevPubKey, mergedTx, i, true, 0))
{
fComplete = false;
}
}
CDataStream ssTx(SER_NETWORK, PROTOCOL_VERSION);
ssTx << mergedTx;
ui->signedTransaction->setText(HexStr(ssTx.begin(), ssTx.end()).c_str());
if(fComplete)
{
ui->statusLabel->setText(tr("Transaction signature is complete"));
ui->sendTransactionButton->setEnabled(true);
}
else
{
ui->statusLabel->setText(tr("Transaction is NOT completely signed"));
ui->sendTransactionButton->setEnabled(false);
}
}
UniValue combinerawtransaction(const JSONRPCRequest& request)
{
if (request.fHelp || request.params.size() != 1)
throw std::runtime_error(
"combinerawtransaction [\"hexstring\",...]\n"
"\nCombine multiple partially signed transactions into one transaction.\n"
"The combined transaction may be another partially signed transaction or a \n"
"fully signed transaction."
"\nArguments:\n"
"1. \"txs\" (string) A json array of hex strings of partially signed transactions\n"
" [\n"
" \"hexstring\" (string) A transaction hash\n"
" ,...\n"
" ]\n"
"\nResult:\n"
"\"hex\" (string) The hex-encoded raw transaction with signature(s)\n"
"\nExamples:\n"
+ HelpExampleCli("combinerawtransaction", "[\"myhex1\", \"myhex2\", \"myhex3\"]")
);
UniValue txs = request.params[0].get_array();
std::vector<CMutableTransaction> txVariants(txs.size());
for (unsigned int idx = 0; idx < txs.size(); idx++) {
if (!DecodeHexTx(txVariants[idx], txs[idx].get_str(), true)) {
throw JSONRPCError(RPC_DESERIALIZATION_ERROR, strprintf("TX decode failed for tx %d", idx));
}
}
if (txVariants.empty()) {
throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "Missing transactions");
}
// mergedTx will end up with all the signatures; it
// starts as a clone of the rawtx:
CMutableTransaction mergedTx(txVariants[0]);
// Fetch previous transactions (inputs):
CCoinsView viewDummy;
CCoinsViewCache view(&viewDummy);
{
LOCK(cs_main);
LOCK(mempool.cs);
CCoinsViewCache &viewChain = *pcoinsTip;
CCoinsViewMemPool viewMempool(&viewChain, mempool);
view.SetBackend(viewMempool); // temporarily switch cache backend to db+mempool view
for (const CTxIn& txin : mergedTx.vin) {
view.AccessCoin(txin.prevout); // Load entries from viewChain into view; can fail.
}
view.SetBackend(viewDummy); // switch back to avoid locking mempool for too long
}
// Use CTransaction for the constant parts of the
// transaction to avoid rehashing.
const CTransaction txConst(mergedTx);
// Sign what we can:
for (unsigned int i = 0; i < mergedTx.vin.size(); i++) {
CTxIn& txin = mergedTx.vin[i];
const Coin& coin = view.AccessCoin(txin.prevout);
if (coin.IsSpent()) {
throw JSONRPCError(RPC_VERIFY_ERROR, "Input not found or already spent");
}
const CScript& prevPubKey = coin.out.scriptPubKey;
const CAmount& amount = coin.out.nValue;
SignatureData sigdata;
// ... and merge in other signatures:
for (const CMutableTransaction& txv : txVariants) {
if (txv.vin.size() > i) {
sigdata = CombineSignatures(prevPubKey, TransactionSignatureChecker(&txConst, i, amount), sigdata, DataFromTransaction(txv, i));
}
}
UpdateTransaction(mergedTx, i, sigdata);
}
return EncodeHexTx(mergedTx);
}
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");
std::vector<CTransaction> txVariants;
txVariants.push_back(tx);
// mergedTx will end up with all the signatures; it
// starts as a clone of the raw tx:
CMutableTransaction mergedTx(txVariants[0]);
bool fComplete = true;
CCoinsView viewDummy;
CCoinsViewCache view(&viewDummy);
if (!registers.count("privatekeys"))
throw std::runtime_error("privatekeys register variable must be set.");
CBasicKeyStore 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");
CBitcoinSecret vchSecret;
bool fGood = vchSecret.SetString(keysObj[kidx].getValStr());
if (!fGood)
throw std::runtime_error("privatekey not valid");
CKey key = vchSecret.GetKey();
tempKeystore.AddKey(key);
}
// Add previous txouts given in the RPC call:
if (!registers.count("prevtxs"))
throw std::runtime_error("prevtxs register variable must be set.");
UniValue prevtxsObj = registers["prevtxs"];
{
for (unsigned int previdx = 0; previdx < prevtxsObj.size(); previdx++) {
UniValue prevOut = prevtxsObj[previdx];
if (!prevOut.isObject())
throw std::runtime_error("expected prevtxs internal object");
std::map<std::string,UniValue::VType> types = boost::assign::map_list_of("txid", UniValue::VSTR)("vout",UniValue::VNUM)("scriptPubKey",UniValue::VSTR);
if (!prevOut.checkObject(types))
throw std::runtime_error("prevtxs internal object typecheck fail");
uint256 txid = ParseHashUV(prevOut["txid"], "txid");
int nOut = atoi(prevOut["vout"].getValStr());
if (nOut < 0)
throw std::runtime_error("vout must be positive");
std::vector<unsigned char> pkData(ParseHexUV(prevOut["scriptPubKey"], "scriptPubKey"));
CScript scriptPubKey(pkData.begin(), pkData.end());
{
CCoinsModifier coins = view.ModifyCoins(txid);
if (coins->IsAvailable(nOut) && coins->vout[nOut].scriptPubKey != scriptPubKey) {
std::string err("Previous output scriptPubKey mismatch:\n");
err = err + ScriptToAsmStr(coins->vout[nOut].scriptPubKey) + "\nvs:\n"+
ScriptToAsmStr(scriptPubKey);
throw std::runtime_error(err);
}
if ((unsigned int)nOut >= coins->vout.size())
coins->vout.resize(nOut+1);
coins->vout[nOut].scriptPubKey = scriptPubKey;
coins->vout[nOut].nValue = 0;
if (prevOut.exists("amount")) {
coins->vout[nOut].nValue = AmountFromValue(prevOut["amount"]);
}
}
// if redeemScript given and private keys given,
// add redeemScript to the tempKeystore so it can be signed:
if ((scriptPubKey.IsPayToScriptHash() || scriptPubKey.IsPayToWitnessScriptHash()) &&
prevOut.exists("redeemScript")) {
UniValue v = prevOut["redeemScript"];
std::vector<unsigned char> rsData(ParseHexUV(v, "redeemScript"));
CScript redeemScript(rsData.begin(), rsData.end());
tempKeystore.AddCScript(redeemScript);
}
}
}
const CKeyStore& keystore = tempKeystore;
bool fHashSingle = ((nHashType & ~SIGHASH_ANYONECANPAY) == SIGHASH_SINGLE);
// Sign what we can:
for (unsigned int i = 0; i < mergedTx.vin.size(); i++) {
CTxIn& txin = mergedTx.vin[i];
const CCoins* coins = view.AccessCoins(txin.prevout.hash);
if (!coins || !coins->IsAvailable(txin.prevout.n)) {
fComplete = false;
continue;
}
const CScript& prevPubKey = coins->vout[txin.prevout.n].scriptPubKey;
const CAmount& amount = coins->vout[txin.prevout.n].nValue;
SignatureData sigdata;
// Only sign SIGHASH_SINGLE if there's a corresponding output:
if (!fHashSingle || (i < mergedTx.vout.size()))
ProduceSignature(MutableTransactionSignatureCreator(&keystore, &mergedTx, i, amount, nHashType), prevPubKey, sigdata);
// ... and merge in other signatures:
BOOST_FOREACH(const CTransaction& txv, txVariants)
sigdata = CombineSignatures(prevPubKey, MutableTransactionSignatureChecker(&mergedTx, i, amount), sigdata, DataFromTransaction(txv, i));
UpdateTransaction(mergedTx, i, sigdata);
if (!VerifyScript(txin.scriptSig, prevPubKey, mergedTx.wit.vtxinwit.size() > i ? &mergedTx.wit.vtxinwit[i].scriptWitness : NULL, STANDARD_SCRIPT_VERIFY_FLAGS, MutableTransactionSignatureChecker(&mergedTx, i, amount)))
fComplete = false;
}
if (fComplete) {
// do nothing... for now
// perhaps store this for later optional JSON output
}
tx = mergedTx;
}
void MultisigDialog::on_signTransactionButton_clicked()
{
ui->signedTransaction->clear();
if(!model)
return;
CWallet *wallet = model->getWallet();
// Decode the raw transaction
std::vector<unsigned char> txData(ParseHex(ui->transaction->text().toStdString()));
CDataStream ss(txData, SER_NETWORK, PROTOCOL_VERSION);
CTransaction tx;
try
{
ss >> tx;
}
catch(std::exception &e)
{
return;
}
CTransaction mergedTx(tx);
// Fetch previous transactions (inputs)
// duplicated in rpcrawtransaction.cpp:389
CCoinsView viewDummy;
CCoinsViewCache view(viewDummy);
{
LOCK(mempool.cs);
CCoinsViewCache &viewChain = *pcoinsTip;
CCoinsViewMemPool viewMempool(viewChain, mempool);
view.SetBackend(viewMempool); // temporarily switch cache backend to db+mempool view
BOOST_FOREACH(const CTxIn& txin, mergedTx.vin) {
const uint256& prevHash = txin.prevout.hash;
CCoins coins;
view.GetCoins(prevHash, coins); // this is certainly allowed to fail
}
view.SetBackend(viewDummy); // switch back to avoid locking mempool for too long
}
// Add the redeem scripts to the wallet keystore
for(int i = 0; i < ui->inputs->count(); i++)
{
MultisigInputEntry *entry = qobject_cast<MultisigInputEntry *>(ui->inputs->itemAt(i)->widget());
if(entry)
{
QString redeemScriptStr = entry->getRedeemScript();
if(redeemScriptStr.size() > 0)
{
std::vector<unsigned char> scriptData(ParseHex(redeemScriptStr.toStdString()));
CScript redeemScript(scriptData.begin(), scriptData.end());
wallet->AddCScript(redeemScript);
}
}
}
WalletModel::UnlockContext ctx(model->requestUnlock());
if(!ctx.isValid())
return;
// Sign what we can:
// mostly like rpcrawtransaction:503
bool fComplete = true;
// Sign what we can:
for (unsigned int i = 0; i < mergedTx.vin.size(); i++)
{
CTxIn& txin = mergedTx.vin[i];
CCoins coins;
if (!view.GetCoins(txin.prevout.hash, coins) || !coins.IsAvailable(txin.prevout.n))
{
fComplete = false;
continue;
}
const CScript& prevPubKey = coins.vout[txin.prevout.n].scriptPubKey;
txin.scriptSig.clear();
SignSignature(*wallet, prevPubKey, mergedTx, i, SIGHASH_ALL);
txin.scriptSig = CombineSignatures(prevPubKey, mergedTx, i, txin.scriptSig, tx.vin[i].scriptSig);
if (!VerifyScript(txin.scriptSig, prevPubKey, mergedTx, i, SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_STRICTENC, 0))
fComplete = false;
}
CDataStream ssTx(SER_NETWORK, PROTOCOL_VERSION);
ssTx << mergedTx;
ui->signedTransaction->setText(HexStr(ssTx.begin(), ssTx.end()).c_str());
if(fComplete)
{
ui->statusLabel->setText(tr("Transaction signature is complete"));
ui->sendTransactionButton->setEnabled(true);
}
else
{
ui->statusLabel->setText(tr("Transaction is NOT completely signed"));
ui->sendTransactionButton->setEnabled(false);
}
}
