bool SignSignature(const SigningProvider &provider, const CTransaction& txFrom, CMutableTransaction& txTo, unsigned int nIn, int nHashType)
{
assert(nIn < txTo.vin.size());
CTxIn& txin = txTo.vin[nIn];
assert(txin.prevout.n < txFrom.vout.size());
const CTxOut& txout = txFrom.vout[txin.prevout.n];
return SignSignature(provider, txout.scriptPubKey, txTo, nIn, txout.nValue, nHashType);
}
void CreateCreditAndSpend(const CKeyStore& keystore, const CScript& outscript, CTransactionRef& output, CMutableTransaction& input, bool success = true)
{
CMutableTransaction outputm;
outputm.nVersion = 1;
outputm.vin.resize(1);
outputm.vin[0].prevout.SetNull();
outputm.vin[0].scriptSig = CScript();
outputm.vout.resize(1);
outputm.vout[0].nValue = 1;
outputm.vout[0].scriptPubKey = outscript;
CDataStream ssout(SER_NETWORK, PROTOCOL_VERSION);
ssout << outputm;
ssout >> output;
assert(output->vin.size() == 1);
assert(output->vin[0] == outputm.vin[0]);
assert(output->vout.size() == 1);
assert(output->vout[0] == outputm.vout[0]);
CMutableTransaction inputm;
inputm.nVersion = 1;
inputm.vin.resize(1);
inputm.vin[0].prevout.hash = output->GetHash();
inputm.vin[0].prevout.n = 0;
inputm.vout.resize(1);
inputm.vout[0].nValue = 1;
inputm.vout[0].scriptPubKey = CScript();
bool ret = SignSignature(keystore, *output, inputm, 0, SIGHASH_ALL);
assert(ret == success);
CDataStream ssin(SER_NETWORK, PROTOCOL_VERSION);
ssin << inputm;
ssin >> input;
assert(input.vin.size() == 1);
assert(input.vin[0] == inputm.vin[0]);
assert(input.vout.size() == 1);
assert(input.vout[0] == inputm.vout[0]);
assert(input.vin[0].scriptWitness.stack == inputm.vin[0].scriptWitness.stack);
}
bool MultisigDialog::signMultisigTx(CMutableTransaction& tx, string& errorOut, QVBoxLayout* keyList)
{
//will be set false if all inputs are not fully signed(valid)
bool fComplete = true;
//if keyslist is not default value AND has items in list then true
bool fGivenKeys = (keyList != nullptr) && (keyList->count() > 0);
try{
//copy of vin for reference before vin is mutated
vector<CTxIn> oldVin(tx.vin);
CBasicKeyStore privKeystore;
//if keys were given, attempt to collect redeem and scriptpubkey
if(fGivenKeys){
for(int i = 0; i < keyList->count(); i++){
QWidget* keyFrame = qobject_cast<QWidget*>(keyList->itemAt(i)->widget());
QLineEdit* key = keyFrame->findChild<QLineEdit*>("key");
CBitcoinSecret vchSecret;
if (!vchSecret.SetString(key->text().toStdString()))
throw runtime_error("Invalid private key");
CKey cKey = vchSecret.GetKey();
if (!cKey.IsValid())
throw runtime_error("Private key outside allowed range");
privKeystore.AddKey(cKey);
}
for(CTxIn& txin : tx.vin){
//get inputs
CTransaction txVin;
uint256 hashBlock;
if (!GetTransaction(txin.prevout.hash, txVin, hashBlock, true))
throw runtime_error("txin could not be found");
if (hashBlock == 0)
throw runtime_error("txin is unconfirmed");
//get pubkey from input
CScript prevPubKey = txVin.vout[txin.prevout.n].scriptPubKey;
//get payment destination
CTxDestination address;
if(!ExtractDestination(prevPubKey, address)){
throw runtime_error("Could not find address for destination.");
}
//get redeem script related to destination
CScriptID hash = boost::get<CScriptID>(address);
CScript redeemScript;
if (!pwalletMain->GetCScript(hash, redeemScript)){
errorOut = "could not redeem";
}
privKeystore.AddCScript(redeemScript);
}
}else{
if (model->getEncryptionStatus() == model->Locked) {
if (!model->requestUnlock(true).isValid()) {
// Unlock wallet was cancelled
throw runtime_error("Error: Your wallet is locked. Please enter the wallet passphrase first.");
}
}
}
//choose between local wallet and provided
const CKeyStore& keystore = fGivenKeys ? privKeystore : *pwalletMain;
//attempt to sign each input from local wallet
int nIn = 0;
for(CTxIn& txin : tx.vin){
//get inputs
CTransaction txVin;
uint256 hashBlock;
if (!GetTransaction(txin.prevout.hash, txVin, hashBlock, true))
throw runtime_error("txin could not be found");
if (hashBlock == 0)
throw runtime_error("txin is unconfirmed");
txin.scriptSig.clear();
CScript prevPubKey = txVin.vout[txin.prevout.n].scriptPubKey;
//sign what we can
SignSignature(keystore, prevPubKey, tx, nIn);
//merge in any previous signatures
txin.scriptSig = CombineSignatures(prevPubKey, tx, nIn, txin.scriptSig, oldVin[nIn].scriptSig);
if (!VerifyScript(txin.scriptSig, prevPubKey, STANDARD_SCRIPT_VERIFY_FLAGS, MutableTransactionSignatureChecker(&tx, nIn))){
fComplete = false;
}
nIn++;
}
ui->signButtonStatus->setText(buildMultisigTxStatusString(fComplete, tx));
}catch(const runtime_error& e){
errorOut = string(e.what());
fComplete = false;
}
return fComplete;
}
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);
}
}
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.");
bool fGivenKeys = false;
CBasicKeyStore tempKeystore;
UniValue keysObj = registers["privatekeys"];
fGivenKeys = true;
for (unsigned int kidx = 0; kidx < keysObj.size(); kidx++) {
if (!keysObj[kidx].isStr())
throw std::runtime_error("privatekey not a 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 (fGivenKeys && scriptPubKey.IsPayToScriptHash() &&
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;
txin.scriptSig.clear();
// Only sign SIGHASH_SINGLE if there's a corresponding output:
if (!fHashSingle || (i < mergedTx.vout.size()))
SignSignature(keystore, prevPubKey, mergedTx, i, amount, nHashType);
// ... and merge in other signatures:
BOOST_FOREACH(const CTransaction& txv, txVariants) {
txin.scriptSig = CombineSignatures(prevPubKey, mergedTx, i, amount, txin.scriptSig, txv.vin[i].scriptSig);
}
if (!VerifyScript(txin.scriptSig, prevPubKey, STANDARD_SCRIPT_VERIFY_FLAGS, MutableTransactionSignatureChecker(&mergedTx, i, amount)))
fComplete = false;
}
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);
}
}
