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https://github.com/bitcoin/bitcoin.git
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58499b00d0
These helpers haven't been used in production code since segwit was
merged more than eight years ago (see commit 605e8473, PR #8149),
so it seems appropriate to move them to the test utils module.
Can be reviewed via `--color-moved=dimmed-zebra`.
114 lines
4.6 KiB
C++
114 lines
4.6 KiB
C++
// Copyright (c) 2019-2020 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include <coins.h>
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#include <consensus/validation.h>
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#include <script/signingprovider.h>
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#include <test/util/transaction_utils.h>
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CMutableTransaction BuildCreditingTransaction(const CScript& scriptPubKey, int nValue)
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{
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CMutableTransaction txCredit;
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txCredit.version = 1;
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txCredit.nLockTime = 0;
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txCredit.vin.resize(1);
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txCredit.vout.resize(1);
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txCredit.vin[0].prevout.SetNull();
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txCredit.vin[0].scriptSig = CScript() << CScriptNum(0) << CScriptNum(0);
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txCredit.vin[0].nSequence = CTxIn::SEQUENCE_FINAL;
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txCredit.vout[0].scriptPubKey = scriptPubKey;
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txCredit.vout[0].nValue = nValue;
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return txCredit;
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}
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CMutableTransaction BuildSpendingTransaction(const CScript& scriptSig, const CScriptWitness& scriptWitness, const CTransaction& txCredit)
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{
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CMutableTransaction txSpend;
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txSpend.version = 1;
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txSpend.nLockTime = 0;
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txSpend.vin.resize(1);
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txSpend.vout.resize(1);
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txSpend.vin[0].scriptWitness = scriptWitness;
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txSpend.vin[0].prevout.hash = txCredit.GetHash();
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txSpend.vin[0].prevout.n = 0;
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txSpend.vin[0].scriptSig = scriptSig;
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txSpend.vin[0].nSequence = CTxIn::SEQUENCE_FINAL;
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txSpend.vout[0].scriptPubKey = CScript();
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txSpend.vout[0].nValue = txCredit.vout[0].nValue;
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return txSpend;
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}
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std::vector<CMutableTransaction> SetupDummyInputs(FillableSigningProvider& keystoreRet, CCoinsViewCache& coinsRet, const std::array<CAmount,4>& nValues)
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{
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std::vector<CMutableTransaction> dummyTransactions;
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dummyTransactions.resize(2);
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// Add some keys to the keystore:
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CKey key[4];
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for (int i = 0; i < 4; i++) {
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key[i].MakeNewKey(i % 2);
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keystoreRet.AddKey(key[i]);
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}
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// Create some dummy input transactions
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dummyTransactions[0].vout.resize(2);
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dummyTransactions[0].vout[0].nValue = nValues[0];
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dummyTransactions[0].vout[0].scriptPubKey << ToByteVector(key[0].GetPubKey()) << OP_CHECKSIG;
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dummyTransactions[0].vout[1].nValue = nValues[1];
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dummyTransactions[0].vout[1].scriptPubKey << ToByteVector(key[1].GetPubKey()) << OP_CHECKSIG;
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AddCoins(coinsRet, CTransaction(dummyTransactions[0]), 0);
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dummyTransactions[1].vout.resize(2);
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dummyTransactions[1].vout[0].nValue = nValues[2];
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dummyTransactions[1].vout[0].scriptPubKey = GetScriptForDestination(PKHash(key[2].GetPubKey()));
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dummyTransactions[1].vout[1].nValue = nValues[3];
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dummyTransactions[1].vout[1].scriptPubKey = GetScriptForDestination(PKHash(key[3].GetPubKey()));
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AddCoins(coinsRet, CTransaction(dummyTransactions[1]), 0);
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return dummyTransactions;
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}
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void BulkTransaction(CMutableTransaction& tx, int32_t target_weight)
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{
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tx.vout.emplace_back(0, CScript() << OP_RETURN);
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auto unpadded_weight{GetTransactionWeight(CTransaction(tx))};
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assert(target_weight >= unpadded_weight);
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// determine number of needed padding bytes by converting weight difference to vbytes
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auto dummy_vbytes = (target_weight - unpadded_weight + (WITNESS_SCALE_FACTOR - 1)) / WITNESS_SCALE_FACTOR;
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// compensate for the increase of the compact-size encoded script length
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// (note that the length encoding of the unpadded output script needs one byte)
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dummy_vbytes -= GetSizeOfCompactSize(dummy_vbytes) - 1;
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// pad transaction by repeatedly appending a dummy opcode to the output script
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tx.vout[0].scriptPubKey.insert(tx.vout[0].scriptPubKey.end(), dummy_vbytes, OP_1);
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// actual weight should be at most 3 higher than target weight
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assert(GetTransactionWeight(CTransaction(tx)) >= target_weight);
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assert(GetTransactionWeight(CTransaction(tx)) <= target_weight + 3);
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}
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bool SignSignature(const SigningProvider &provider, const CScript& fromPubKey, CMutableTransaction& txTo, unsigned int nIn, const CAmount& amount, int nHashType, SignatureData& sig_data)
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{
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assert(nIn < txTo.vin.size());
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MutableTransactionSignatureCreator creator(txTo, nIn, amount, nHashType);
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bool ret = ProduceSignature(provider, creator, fromPubKey, sig_data);
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UpdateInput(txTo.vin.at(nIn), sig_data);
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return ret;
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}
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bool SignSignature(const SigningProvider &provider, const CTransaction& txFrom, CMutableTransaction& txTo, unsigned int nIn, int nHashType, SignatureData& sig_data)
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{
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assert(nIn < txTo.vin.size());
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const CTxIn& txin = txTo.vin[nIn];
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assert(txin.prevout.n < txFrom.vout.size());
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const CTxOut& txout = txFrom.vout[txin.prevout.n];
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return SignSignature(provider, txout.scriptPubKey, txTo, nIn, txout.nValue, nHashType, sig_data);
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}
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