LCOV - code coverage report
Current view: top level - src/test - sighash_tests.cpp (source / functions) Coverage Total Hit
Test: test_bitcoin_coverage.info Lines: 96.3 % 161 155
Test Date: 2025-08-13 04:26:42 Functions: 100.0 % 9 9
Branches: 54.2 % 530 287

             Branch data     Line data    Source code
       1                 :             : // Copyright (c) 2013-2022 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 <common/system.h>
       6                 :             : #include <consensus/tx_check.h>
       7                 :             : #include <consensus/validation.h>
       8                 :             : #include <hash.h>
       9                 :             : #include <script/interpreter.h>
      10                 :             : #include <script/script.h>
      11                 :             : #include <serialize.h>
      12                 :             : #include <streams.h>
      13                 :             : #include <test/data/sighash.json.h>
      14                 :             : #include <test/util/json.h>
      15                 :             : #include <test/util/random.h>
      16                 :             : #include <test/util/setup_common.h>
      17                 :             : #include <util/strencodings.h>
      18                 :             : 
      19                 :             : #include <iostream>
      20                 :             : 
      21                 :             : #include <boost/test/unit_test.hpp>
      22                 :             : 
      23                 :             : #include <univalue.h>
      24                 :             : 
      25                 :             : // Old script.cpp SignatureHash function
      26                 :       50019 : uint256 static SignatureHashOld(CScript scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType)
      27                 :             : {
      28   [ -  +  -  + ]:       50019 :     if (nIn >= txTo.vin.size())
      29                 :             :     {
      30                 :           0 :         return uint256::ONE;
      31                 :             :     }
      32                 :       50019 :     CMutableTransaction txTmp(txTo);
      33                 :             : 
      34                 :             :     // In case concatenating two scripts ends up with two codeseparators,
      35                 :             :     // or an extra one at the end, this prevents all those possible incompatibilities.
      36   [ +  -  +  - ]:       50019 :     FindAndDelete(scriptCode, CScript(OP_CODESEPARATOR));
      37                 :             : 
      38                 :             :     // Blank out other inputs' signatures
      39   [ -  +  +  + ]:      175525 :     for (unsigned int i = 0; i < txTmp.vin.size(); i++)
      40                 :      125506 :         txTmp.vin[i].scriptSig = CScript();
      41                 :       50019 :     txTmp.vin[nIn].scriptSig = scriptCode;
      42                 :             : 
      43                 :             :     // Blank out some of the outputs
      44         [ +  + ]:       50019 :     if ((nHashType & 0x1f) == SIGHASH_NONE)
      45                 :             :     {
      46                 :             :         // Wildcard payee
      47                 :        1513 :         txTmp.vout.clear();
      48                 :             : 
      49                 :             :         // Let the others update at will
      50   [ -  +  +  + ]:        5292 :         for (unsigned int i = 0; i < txTmp.vin.size(); i++)
      51         [ +  + ]:        3779 :             if (i != nIn)
      52                 :        2266 :                 txTmp.vin[i].nSequence = 0;
      53                 :             :     }
      54         [ +  + ]:       48506 :     else if ((nHashType & 0x1f) == SIGHASH_SINGLE)
      55                 :             :     {
      56                 :             :         // Only lock-in the txout payee at same index as txin
      57                 :        1562 :         unsigned int nOut = nIn;
      58   [ -  +  +  + ]:        1562 :         if (nOut >= txTmp.vout.size())
      59                 :             :         {
      60                 :           3 :             return uint256::ONE;
      61                 :             :         }
      62         [ +  - ]:        1559 :         txTmp.vout.resize(nOut+1);
      63         [ +  + ]:        2745 :         for (unsigned int i = 0; i < nOut; i++)
      64                 :        1186 :             txTmp.vout[i].SetNull();
      65                 :             : 
      66                 :             :         // Let the others update at will
      67   [ -  +  +  + ]:        5447 :         for (unsigned int i = 0; i < txTmp.vin.size(); i++)
      68         [ +  + ]:        3888 :             if (i != nIn)
      69                 :        2329 :                 txTmp.vin[i].nSequence = 0;
      70                 :             :     }
      71                 :             : 
      72                 :             :     // Blank out other inputs completely, not recommended for open transactions
      73         [ +  + ]:       50016 :     if (nHashType & SIGHASH_ANYONECANPAY)
      74                 :             :     {
      75         [ +  - ]:       24947 :         txTmp.vin[0] = txTmp.vin[nIn];
      76         [ +  - ]:       24947 :         txTmp.vin.resize(1);
      77                 :             :     }
      78                 :             : 
      79                 :             :     // Serialize and hash
      80         [ +  - ]:       50016 :     HashWriter ss{};
      81   [ +  -  +  - ]:       50016 :     ss << TX_NO_WITNESS(txTmp) << nHashType;
      82         [ +  - ]:       50016 :     return ss.GetHash();
      83                 :       50019 : }
      84                 :             : 
      85                 :           6 : struct SigHashTest : BasicTestingSetup {
      86                 :      300690 : void RandomScript(CScript &script) {
      87                 :      300690 :     static const opcodetype oplist[] = {OP_FALSE, OP_1, OP_2, OP_3, OP_CHECKSIG, OP_IF, OP_VERIF, OP_RETURN, OP_CODESEPARATOR};
      88                 :      300690 :     script = CScript();
      89                 :      300690 :     int ops = (m_rng.randrange(10));
      90         [ +  + ]:     1653187 :     for (int i=0; i<ops; i++)
      91                 :     1352497 :         script << oplist[m_rng.randrange(std::size(oplist))];
      92                 :      300690 : }
      93                 :             : 
      94                 :       50001 : void RandomTransaction(CMutableTransaction& tx, bool fSingle)
      95                 :             : {
      96                 :       50001 :     tx.version = m_rng.rand32();
      97                 :       50001 :     tx.vin.clear();
      98                 :       50001 :     tx.vout.clear();
      99         [ +  + ]:       50001 :     tx.nLockTime = (m_rng.randbool()) ? m_rng.rand32() : 0;
     100                 :       50001 :     int ins = (m_rng.randbits(2)) + 1;
     101         [ +  + ]:       50001 :     int outs = fSingle ? ins : (m_rng.randbits(2)) + 1;
     102         [ +  + ]:      175435 :     for (int in = 0; in < ins; in++) {
     103                 :      125434 :         tx.vin.emplace_back();
     104                 :      125434 :         CTxIn &txin = tx.vin.back();
     105                 :      125434 :         txin.prevout.hash = Txid::FromUint256(m_rng.rand256());
     106                 :      125434 :         txin.prevout.n = m_rng.randbits(2);
     107                 :      125434 :         RandomScript(txin.scriptSig);
     108         [ +  + ]:      125434 :         txin.nSequence = (m_rng.randbool()) ? m_rng.rand32() : std::numeric_limits<uint32_t>::max();
     109                 :             :     }
     110         [ +  + ]:      175256 :     for (int out = 0; out < outs; out++) {
     111                 :      125255 :         tx.vout.emplace_back();
     112                 :      125255 :         CTxOut &txout = tx.vout.back();
     113                 :      125255 :         txout.nValue = RandMoney(m_rng);
     114                 :      125255 :         RandomScript(txout.scriptPubKey);
     115                 :             :     }
     116                 :       50001 : }
     117                 :             : }; // struct SigHashTest
     118                 :             : 
     119                 :             : BOOST_FIXTURE_TEST_SUITE(sighash_tests, SigHashTest)
     120                 :             : 
     121   [ +  -  +  -  :           7 : BOOST_AUTO_TEST_CASE(sighash_test)
          +  -  +  -  -  
          +  +  -  +  -  
          +  -  +  -  +  
          -  +  -  -  +  
          +  -  +  -  +  
          -  +  -  +  -  
          +  -  -  +  +  
          -  +  -  +  -  
          +  -  +  -  +  
          -  +  -  -  +  
          +  -  +  -  +  
          -  +  -  +  -  
          +  -  -  +  +  
                      - ]
     122                 :             : {
     123                 :             :     #if defined(PRINT_SIGHASH_JSON)
     124                 :             :     std::cout << "[\n";
     125                 :             :     std::cout << "\t[\"raw_transaction, script, input_index, hashType, signature_hash (result)\"],\n";
     126                 :             :     int nRandomTests = 500;
     127                 :             :     #else
     128                 :           1 :     int nRandomTests = 50000;
     129                 :             :     #endif
     130         [ +  + ]:       50001 :     for (int i=0; i<nRandomTests; i++) {
     131                 :       50000 :         int nHashType{int(m_rng.rand32())};
     132                 :       50000 :         CMutableTransaction txTo;
     133         [ +  - ]:       50000 :         RandomTransaction(txTo, (nHashType & 0x1f) == SIGHASH_SINGLE);
     134                 :       50000 :         CScript scriptCode;
     135         [ +  - ]:       50000 :         RandomScript(scriptCode);
     136         [ -  + ]:       50000 :         int nIn = m_rng.randrange(txTo.vin.size());
     137                 :             : 
     138                 :       50000 :         uint256 sh, sho;
     139   [ +  -  +  - ]:      150000 :         sho = SignatureHashOld(scriptCode, CTransaction(txTo), nIn, nHashType);
     140         [ +  - ]:       50000 :         sh = SignatureHash(scriptCode, txTo, nIn, nHashType, 0, SigVersion::BASE);
     141                 :             :         #if defined(PRINT_SIGHASH_JSON)
     142                 :             :         DataStream ss;
     143                 :             :         ss << TX_WITH_WITNESS(txTo);
     144                 :             : 
     145                 :             :         std::cout << "\t[\"" ;
     146                 :             :         std::cout << HexStr(ss) << "\", \"";
     147                 :             :         std::cout << HexStr(scriptCode) << "\", ";
     148                 :             :         std::cout << nIn << ", ";
     149                 :             :         std::cout << nHashType << ", \"";
     150                 :             :         std::cout << sho.GetHex() << "\"]";
     151                 :             :         if (i+1 != nRandomTests) {
     152                 :             :           std::cout << ",";
     153                 :             :         }
     154                 :             :         std::cout << "\n";
     155                 :             :         #endif
     156   [ +  -  +  - ]:      100000 :         BOOST_CHECK(sh == sho);
     157                 :      100000 :     }
     158                 :             :     #if defined(PRINT_SIGHASH_JSON)
     159                 :             :     std::cout << "]\n";
     160                 :             :     #endif
     161                 :           1 : }
     162                 :             : 
     163                 :             : // Goal: check that SignatureHash generates correct hash
     164   [ +  -  +  -  :           7 : BOOST_AUTO_TEST_CASE(sighash_from_data)
          +  -  +  -  -  
          +  +  -  +  -  
          +  -  +  -  +  
          -  +  -  -  +  
          +  -  +  -  +  
          -  +  -  +  -  
          +  -  -  +  +  
          -  +  -  +  -  
          +  -  +  -  +  
          -  +  -  -  +  
          +  -  +  -  +  
          -  +  -  +  -  
          +  -  -  +  +  
                      - ]
     165                 :             : {
     166                 :           1 :     UniValue tests = read_json(json_tests::sighash);
     167                 :             : 
     168   [ -  +  +  + ]:         502 :     for (unsigned int idx = 0; idx < tests.size(); idx++) {
     169         [ +  - ]:         501 :         const UniValue& test = tests[idx];
     170         [ +  - ]:         501 :         std::string strTest = test.write();
     171   [ -  +  -  + ]:         501 :         if (test.size() < 1) // Allow for extra stuff (useful for comments)
     172                 :             :         {
     173   [ #  #  #  # ]:           0 :             BOOST_ERROR("Bad test: " << strTest);
     174                 :           0 :             continue;
     175                 :             :         }
     176         [ +  + ]:         501 :         if (test.size() == 1) continue; // comment
     177                 :             : 
     178         [ +  - ]:         500 :         std::string raw_tx, raw_script, sigHashHex;
     179                 :         500 :         int nIn, nHashType;
     180                 :         500 :         uint256 sh;
     181                 :         500 :         CTransactionRef tx;
     182                 :         500 :         CScript scriptCode = CScript();
     183                 :             : 
     184                 :         500 :         try {
     185                 :             :           // deserialize test data
     186   [ +  -  +  -  :         500 :           raw_tx = test[0].get_str();
                   +  - ]
     187   [ +  -  +  -  :         500 :           raw_script = test[1].get_str();
                   +  - ]
     188   [ +  -  +  - ]:         500 :           nIn = test[2].getInt<int>();
     189   [ +  -  +  - ]:         500 :           nHashType = test[3].getInt<int>();
     190   [ +  -  +  -  :         500 :           sigHashHex = test[4].get_str();
                   +  - ]
     191                 :             : 
     192   [ -  +  +  -  :        1000 :           DataStream stream(ParseHex(raw_tx));
                   +  - ]
     193   [ +  -  +  - ]:        1000 :           stream >> TX_WITH_WITNESS(tx);
     194                 :             : 
     195         [ +  - ]:         500 :           TxValidationState state;
     196   [ +  -  +  -  :        1000 :           BOOST_CHECK_MESSAGE(CheckTransaction(*tx, state), strTest);
             +  -  +  - ]
     197   [ +  -  +  -  :        1000 :           BOOST_CHECK(state.IsValid());
                   -  + ]
     198                 :             : 
     199   [ -  +  +  - ]:         500 :           std::vector<unsigned char> raw = ParseHex(raw_script);
     200                 :         500 :           scriptCode.insert(scriptCode.end(), raw.begin(), raw.end());
     201                 :        1000 :         } catch (...) {
     202   [ -  -  -  -  :           0 :           BOOST_ERROR("Bad test, couldn't deserialize data: " << strTest);
                   -  - ]
     203                 :           0 :           continue;
     204         [ -  - ]:           0 :         }
     205                 :             : 
     206         [ +  - ]:         500 :         sh = SignatureHash(scriptCode, *tx, nIn, nHashType, 0, SigVersion::BASE);
     207   [ +  -  +  -  :        1000 :         BOOST_CHECK_MESSAGE(sh.GetHex() == sigHashHex, strTest);
                   +  - ]
     208   [ +  -  -  - ]:        1001 :     }
     209                 :           1 : }
     210                 :             : 
     211   [ +  -  +  -  :           7 : BOOST_AUTO_TEST_CASE(sighash_caching)
          +  -  +  -  -  
          +  +  -  +  -  
          +  -  +  -  +  
          -  +  -  -  +  
          +  -  +  -  +  
          -  +  -  +  -  
          +  -  -  +  +  
          -  +  -  +  -  
          +  -  +  -  +  
          -  +  -  -  +  
          +  -  +  -  +  
          -  +  -  +  -  
          +  -  -  +  +  
                      - ]
     212                 :             : {
     213                 :             :     // Get a script, transaction and parameters as inputs to the sighash function.
     214                 :           1 :     CScript scriptcode;
     215         [ +  - ]:           1 :     RandomScript(scriptcode);
     216                 :           1 :     CScript diff_scriptcode{scriptcode};
     217         [ +  - ]:           1 :     diff_scriptcode << OP_1;
     218         [ +  - ]:           1 :     CMutableTransaction tx;
     219         [ +  - ]:           1 :     RandomTransaction(tx, /*fSingle=*/false);
     220         [ -  + ]:           1 :     const auto in_index{static_cast<uint32_t>(m_rng.randrange(tx.vin.size()))};
     221                 :           1 :     const auto amount{m_rng.rand<CAmount>()};
     222                 :             : 
     223                 :             :     // Exercise the sighash function under both legacy and segwit v0.
     224         [ +  + ]:           3 :     for (const auto sigversion: {SigVersion::BASE, SigVersion::WITNESS_V0}) {
     225                 :             :         // For each, run it against all the 6 standard hash types and a few additional random ones.
     226                 :           2 :         std::vector<int32_t> hash_types{{SIGHASH_ALL, SIGHASH_SINGLE, SIGHASH_NONE, SIGHASH_ALL | SIGHASH_ANYONECANPAY,
     227                 :             :                                           SIGHASH_SINGLE | SIGHASH_ANYONECANPAY, SIGHASH_NONE | SIGHASH_ANYONECANPAY,
     228         [ +  - ]:           2 :                                           SIGHASH_ANYONECANPAY, 0, std::numeric_limits<int32_t>::max()}};
     229         [ +  + ]:          22 :         for (int i{0}; i < 10; ++i) {
     230   [ +  +  +  - ]:          20 :             hash_types.push_back(i % 2 == 0 ? m_rng.rand<int8_t>() : m_rng.rand<int32_t>());
     231                 :             :         }
     232                 :             : 
     233                 :             :         // Reuse the same cache across script types. This must not cause any issue as the cached value for one hash type must never
     234                 :             :         // be confused for another (instantiating the cache within the loop instead would prevent testing this).
     235                 :           2 :         SigHashCache cache;
     236         [ +  + ]:          40 :         for (const auto hash_type: hash_types) {
     237   [ +  +  +  +  :          38 :             const bool expect_one{sigversion == SigVersion::BASE && ((hash_type & 0x1f) == SIGHASH_SINGLE) && in_index >= tx.vout.size()};
             -  +  -  + ]
     238                 :             : 
     239                 :             :             // The result of computing the sighash should be the same with or without cache.
     240         [ +  - ]:          38 :             const auto sighash_with_cache{SignatureHash(scriptcode, tx, in_index, hash_type, amount, sigversion, nullptr, &cache)};
     241         [ +  - ]:          38 :             const auto sighash_no_cache{SignatureHash(scriptcode, tx, in_index, hash_type, amount, sigversion, nullptr, nullptr)};
     242   [ +  -  +  - ]:          38 :             BOOST_CHECK_EQUAL(sighash_with_cache, sighash_no_cache);
     243                 :             : 
     244                 :             :             // Calling the cached version again should return the same value again.
     245   [ +  -  +  -  :          38 :             BOOST_CHECK_EQUAL(sighash_with_cache, SignatureHash(scriptcode, tx, in_index, hash_type, amount, sigversion, nullptr, &cache));
                   +  - ]
     246                 :             : 
     247                 :             :             // While here we might as well also check that the result for legacy is the same as for the old SignatureHash() function.
     248         [ +  + ]:          38 :             if (sigversion == SigVersion::BASE) {
     249   [ +  -  +  -  :          57 :                 BOOST_CHECK_EQUAL(sighash_with_cache, SignatureHashOld(scriptcode, CTransaction(tx), in_index, hash_type));
             +  -  +  - ]
     250                 :             :             }
     251                 :             : 
     252                 :             :             // Calling with a different scriptcode (for instance in case a CODESEP is encountered) will not return the cache value but
     253                 :             :             // overwrite it. The sighash will always be different except in case of legacy SIGHASH_SINGLE bug.
     254         [ +  - ]:          38 :             const auto sighash_with_cache2{SignatureHash(diff_scriptcode, tx, in_index, hash_type, amount, sigversion, nullptr, &cache)};
     255         [ +  - ]:          38 :             const auto sighash_no_cache2{SignatureHash(diff_scriptcode, tx, in_index, hash_type, amount, sigversion, nullptr, nullptr)};
     256   [ +  -  +  - ]:          38 :             BOOST_CHECK_EQUAL(sighash_with_cache2, sighash_no_cache2);
     257         [ +  + ]:          38 :             if (!expect_one) {
     258   [ +  -  +  - ]:          35 :                 BOOST_CHECK_NE(sighash_with_cache, sighash_with_cache2);
     259                 :             :             } else {
     260   [ +  -  +  - ]:           3 :                 BOOST_CHECK_EQUAL(sighash_with_cache, sighash_with_cache2);
     261   [ +  -  +  - ]:           3 :                 BOOST_CHECK_EQUAL(sighash_with_cache, uint256::ONE);
     262                 :             :             }
     263                 :             : 
     264                 :             :             // Calling the cached version again should return the same value again.
     265   [ +  -  +  -  :          38 :             BOOST_CHECK_EQUAL(sighash_with_cache2, SignatureHash(diff_scriptcode, tx, in_index, hash_type, amount, sigversion, nullptr, &cache));
                   +  - ]
     266                 :             : 
     267                 :             :             // And if we store a different value for this scriptcode and hash type it will return that instead.
     268                 :          38 :             {
     269         [ +  - ]:          38 :                 HashWriter h{};
     270         [ +  - ]:          38 :                 h << 42;
     271                 :          38 :                 cache.Store(hash_type, scriptcode, h);
     272         [ +  - ]:          38 :                 const auto stored_hash{h.GetHash()};
     273   [ +  -  +  -  :          76 :                 BOOST_CHECK(cache.Load(hash_type, scriptcode, h));
                   +  - ]
     274         [ +  - ]:          38 :                 const auto loaded_hash{h.GetHash()};
     275   [ +  -  +  - ]:          38 :                 BOOST_CHECK_EQUAL(stored_hash, loaded_hash);
     276                 :             :             }
     277                 :             : 
     278                 :             :             // And using this mutated cache with the sighash function will return the new value (except in the legacy SIGHASH_SINGLE bug
     279                 :             :             // case in which it'll return 1).
     280         [ +  + ]:          38 :             if (!expect_one) {
     281   [ +  -  +  -  :          35 :                 BOOST_CHECK_NE(SignatureHash(scriptcode, tx, in_index, hash_type, amount, sigversion, nullptr, &cache), sighash_with_cache);
                   +  - ]
     282         [ +  - ]:          35 :                 HashWriter h{};
     283   [ +  -  +  -  :          70 :                 BOOST_CHECK(cache.Load(hash_type, scriptcode, h));
                   +  - ]
     284         [ +  - ]:          35 :                 h << hash_type;
     285         [ +  - ]:          35 :                 const auto new_hash{h.GetHash()};
     286   [ +  -  +  -  :          35 :                 BOOST_CHECK_EQUAL(SignatureHash(scriptcode, tx, in_index, hash_type, amount, sigversion, nullptr, &cache), new_hash);
                   +  - ]
     287                 :             :             } else {
     288   [ +  -  +  -  :           3 :                 BOOST_CHECK_EQUAL(SignatureHash(scriptcode, tx, in_index, hash_type, amount, sigversion, nullptr, &cache), uint256::ONE);
                   +  - ]
     289                 :             :             }
     290                 :             : 
     291                 :             :             // Wipe the cache and restore the correct cached value for this scriptcode and hash_type before starting the next iteration.
     292         [ +  - ]:          38 :             HashWriter dummy{};
     293                 :          38 :             cache.Store(hash_type, diff_scriptcode, dummy);
     294         [ +  - ]:          38 :             (void)SignatureHash(scriptcode, tx, in_index, hash_type, amount, sigversion, nullptr, &cache);
     295   [ +  -  +  +  :          76 :             BOOST_CHECK(cache.Load(hash_type, scriptcode, dummy) || expect_one);
             -  +  +  - ]
     296                 :             :         }
     297                 :           2 :     }
     298                 :           1 : }
     299                 :             : 
     300                 :             : BOOST_AUTO_TEST_SUITE_END()
        

Generated by: LCOV version 2.0-1