1  // Copyright (c) 2019-2020 The Bitcoin Core developers
 2  // Distributed under the MIT software license, see the accompanying
 3  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 4  
 5  #include <coins.h>
 6  #include <script/signingprovider.h>
 7  #include <test/util/transaction_utils.h>
 8  
 9  CMutableTransaction BuildCreditingTransaction(const CScript& scriptPubKey, int nValue)
10  {
11      CMutableTransaction txCredit;
12      txCredit.nVersion = 1;
13      txCredit.nLockTime = 0;
14      txCredit.vin.resize(1);
15      txCredit.vout.resize(1);
16      txCredit.vin[0].prevout.SetNull();
17      txCredit.vin[0].scriptSig = CScript() << CScriptNum(0) << CScriptNum(0);
18      txCredit.vin[0].nSequence = CTxIn::SEQUENCE_FINAL;
19      txCredit.vout[0].scriptPubKey = scriptPubKey;
20      txCredit.vout[0].nValue = nValue;
21  
22      return txCredit;
23  }
24  
25  CMutableTransaction BuildSpendingTransaction(const CScript& scriptSig, const CScriptWitness& scriptWitness, const CTransaction& txCredit)
26  {
27      CMutableTransaction txSpend;
28      txSpend.nVersion = 1;
29      txSpend.nLockTime = 0;
30      txSpend.vin.resize(1);
31      txSpend.vout.resize(1);
32      txSpend.vin[0].scriptWitness = scriptWitness;
33      txSpend.vin[0].prevout.hash = txCredit.GetHash();
34      txSpend.vin[0].prevout.n = 0;
35      txSpend.vin[0].scriptSig = scriptSig;
36      txSpend.vin[0].nSequence = CTxIn::SEQUENCE_FINAL;
37      txSpend.vout[0].scriptPubKey = CScript();
38      txSpend.vout[0].nValue = txCredit.vout[0].nValue;
39  
40      return txSpend;
41  }
42  
43  std::vector<CMutableTransaction> SetupDummyInputs(FillableSigningProvider& keystoreRet, CCoinsViewCache& coinsRet, const std::array<CAmount,4>& nValues)
44  {
45      std::vector<CMutableTransaction> dummyTransactions;
46      dummyTransactions.resize(2);
47  
48      // Add some keys to the keystore:
49      CKey key[4];
50      for (int i = 0; i < 4; i++) {
51          key[i].MakeNewKey(i % 2);
52          keystoreRet.AddKey(key[i]);
53      }
54  
55      // Create some dummy input transactions
56      dummyTransactions[0].vout.resize(2);
57      dummyTransactions[0].vout[0].nValue = nValues[0];
58      dummyTransactions[0].vout[0].scriptPubKey << ToByteVector(key[0].GetPubKey()) << OP_CHECKSIG;
59      dummyTransactions[0].vout[1].nValue = nValues[1];
60      dummyTransactions[0].vout[1].scriptPubKey << ToByteVector(key[1].GetPubKey()) << OP_CHECKSIG;
61      AddCoins(coinsRet, CTransaction(dummyTransactions[0]), 0);
62  
63      dummyTransactions[1].vout.resize(2);
64      dummyTransactions[1].vout[0].nValue = nValues[2];
65      dummyTransactions[1].vout[0].scriptPubKey = GetScriptForDestination(PKHash(key[2].GetPubKey()));
66      dummyTransactions[1].vout[1].nValue = nValues[3];
67      dummyTransactions[1].vout[1].scriptPubKey = GetScriptForDestination(PKHash(key[3].GetPubKey()));
68      AddCoins(coinsRet, CTransaction(dummyTransactions[1]), 0);
69  
70      return dummyTransactions;
71  }