LCOV - code coverage report
Current view: top level - src/test - pow_tests.cpp (source / functions) Hit Total Coverage
Test: fuzz_coverage.info Lines: 0 137 0.0 %
Date: 2023-10-05 12:38:51 Functions: 0 75 0.0 %
Branches: 0 0 -

           Branch data     Line data    Source code
       1                 :            : // Copyright (c) 2015-2022 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 <chain.h>
       6                 :            : #include <chainparams.h>
       7                 :            : #include <pow.h>
       8                 :            : #include <test/util/random.h>
       9                 :            : #include <test/util/setup_common.h>
      10                 :            : #include <util/chaintype.h>
      11                 :            : 
      12                 :            : #include <boost/test/unit_test.hpp>
      13                 :            : 
      14                 :          0 : BOOST_FIXTURE_TEST_SUITE(pow_tests, BasicTestingSetup)
      15                 :            : 
      16                 :            : /* Test calculation of next difficulty target with no constraints applying */
      17                 :          0 : BOOST_AUTO_TEST_CASE(get_next_work)
      18                 :            : {
      19                 :          0 :     const auto chainParams = CreateChainParams(*m_node.args, ChainType::MAIN);
      20                 :          0 :     int64_t nLastRetargetTime = 1261130161; // Block #30240
      21                 :          0 :     CBlockIndex pindexLast;
      22                 :          0 :     pindexLast.nHeight = 32255;
      23                 :          0 :     pindexLast.nTime = 1262152739;  // Block #32255
      24                 :          0 :     pindexLast.nBits = 0x1d00ffff;
      25                 :            : 
      26                 :            :     // Here (and below): expected_nbits is calculated in
      27                 :            :     // CalculateNextWorkRequired(); redoing the calculation here would be just
      28                 :            :     // reimplementing the same code that is written in pow.cpp. Rather than
      29                 :            :     // copy that code, we just hardcode the expected result.
      30                 :          0 :     unsigned int expected_nbits = 0x1d00d86aU;
      31                 :          0 :     BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, chainParams->GetConsensus()), expected_nbits);
      32                 :          0 :     BOOST_CHECK(PermittedDifficultyTransition(chainParams->GetConsensus(), pindexLast.nHeight+1, pindexLast.nBits, expected_nbits));
      33                 :          0 : }
      34                 :            : 
      35                 :            : /* Test the constraint on the upper bound for next work */
      36                 :          0 : BOOST_AUTO_TEST_CASE(get_next_work_pow_limit)
      37                 :            : {
      38                 :          0 :     const auto chainParams = CreateChainParams(*m_node.args, ChainType::MAIN);
      39                 :          0 :     int64_t nLastRetargetTime = 1231006505; // Block #0
      40                 :          0 :     CBlockIndex pindexLast;
      41                 :          0 :     pindexLast.nHeight = 2015;
      42                 :          0 :     pindexLast.nTime = 1233061996;  // Block #2015
      43                 :          0 :     pindexLast.nBits = 0x1d00ffff;
      44                 :          0 :     unsigned int expected_nbits = 0x1d00ffffU;
      45                 :          0 :     BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, chainParams->GetConsensus()), expected_nbits);
      46                 :          0 :     BOOST_CHECK(PermittedDifficultyTransition(chainParams->GetConsensus(), pindexLast.nHeight+1, pindexLast.nBits, expected_nbits));
      47                 :          0 : }
      48                 :            : 
      49                 :            : /* Test the constraint on the lower bound for actual time taken */
      50                 :          0 : BOOST_AUTO_TEST_CASE(get_next_work_lower_limit_actual)
      51                 :            : {
      52                 :          0 :     const auto chainParams = CreateChainParams(*m_node.args, ChainType::MAIN);
      53                 :          0 :     int64_t nLastRetargetTime = 1279008237; // Block #66528
      54                 :          0 :     CBlockIndex pindexLast;
      55                 :          0 :     pindexLast.nHeight = 68543;
      56                 :          0 :     pindexLast.nTime = 1279297671;  // Block #68543
      57                 :          0 :     pindexLast.nBits = 0x1c05a3f4;
      58                 :          0 :     unsigned int expected_nbits = 0x1c0168fdU;
      59                 :          0 :     BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, chainParams->GetConsensus()), expected_nbits);
      60                 :          0 :     BOOST_CHECK(PermittedDifficultyTransition(chainParams->GetConsensus(), pindexLast.nHeight+1, pindexLast.nBits, expected_nbits));
      61                 :            :     // Test that reducing nbits further would not be a PermittedDifficultyTransition.
      62                 :          0 :     unsigned int invalid_nbits = expected_nbits-1;
      63                 :          0 :     BOOST_CHECK(!PermittedDifficultyTransition(chainParams->GetConsensus(), pindexLast.nHeight+1, pindexLast.nBits, invalid_nbits));
      64                 :          0 : }
      65                 :            : 
      66                 :            : /* Test the constraint on the upper bound for actual time taken */
      67                 :          0 : BOOST_AUTO_TEST_CASE(get_next_work_upper_limit_actual)
      68                 :            : {
      69                 :          0 :     const auto chainParams = CreateChainParams(*m_node.args, ChainType::MAIN);
      70                 :          0 :     int64_t nLastRetargetTime = 1263163443; // NOTE: Not an actual block time
      71                 :          0 :     CBlockIndex pindexLast;
      72                 :          0 :     pindexLast.nHeight = 46367;
      73                 :          0 :     pindexLast.nTime = 1269211443;  // Block #46367
      74                 :          0 :     pindexLast.nBits = 0x1c387f6f;
      75                 :          0 :     unsigned int expected_nbits = 0x1d00e1fdU;
      76                 :          0 :     BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, chainParams->GetConsensus()), expected_nbits);
      77                 :          0 :     BOOST_CHECK(PermittedDifficultyTransition(chainParams->GetConsensus(), pindexLast.nHeight+1, pindexLast.nBits, expected_nbits));
      78                 :            :     // Test that increasing nbits further would not be a PermittedDifficultyTransition.
      79                 :          0 :     unsigned int invalid_nbits = expected_nbits+1;
      80                 :          0 :     BOOST_CHECK(!PermittedDifficultyTransition(chainParams->GetConsensus(), pindexLast.nHeight+1, pindexLast.nBits, invalid_nbits));
      81                 :          0 : }
      82                 :            : 
      83                 :          0 : BOOST_AUTO_TEST_CASE(CheckProofOfWork_test_negative_target)
      84                 :            : {
      85                 :          0 :     const auto consensus = CreateChainParams(*m_node.args, ChainType::MAIN)->GetConsensus();
      86                 :          0 :     uint256 hash;
      87                 :            :     unsigned int nBits;
      88                 :          0 :     nBits = UintToArith256(consensus.powLimit).GetCompact(true);
      89                 :          0 :     hash.SetHex("0x1");
      90                 :          0 :     BOOST_CHECK(!CheckProofOfWork(hash, nBits, consensus));
      91                 :          0 : }
      92                 :            : 
      93                 :          0 : BOOST_AUTO_TEST_CASE(CheckProofOfWork_test_overflow_target)
      94                 :            : {
      95                 :          0 :     const auto consensus = CreateChainParams(*m_node.args, ChainType::MAIN)->GetConsensus();
      96                 :          0 :     uint256 hash;
      97                 :          0 :     unsigned int nBits{~0x00800000U};
      98                 :          0 :     hash.SetHex("0x1");
      99                 :          0 :     BOOST_CHECK(!CheckProofOfWork(hash, nBits, consensus));
     100                 :          0 : }
     101                 :            : 
     102                 :          0 : BOOST_AUTO_TEST_CASE(CheckProofOfWork_test_too_easy_target)
     103                 :            : {
     104                 :          0 :     const auto consensus = CreateChainParams(*m_node.args, ChainType::MAIN)->GetConsensus();
     105                 :          0 :     uint256 hash;
     106                 :            :     unsigned int nBits;
     107                 :          0 :     arith_uint256 nBits_arith = UintToArith256(consensus.powLimit);
     108                 :          0 :     nBits_arith *= 2;
     109                 :          0 :     nBits = nBits_arith.GetCompact();
     110                 :          0 :     hash.SetHex("0x1");
     111                 :          0 :     BOOST_CHECK(!CheckProofOfWork(hash, nBits, consensus));
     112                 :          0 : }
     113                 :            : 
     114                 :          0 : BOOST_AUTO_TEST_CASE(CheckProofOfWork_test_biger_hash_than_target)
     115                 :            : {
     116                 :          0 :     const auto consensus = CreateChainParams(*m_node.args, ChainType::MAIN)->GetConsensus();
     117                 :          0 :     uint256 hash;
     118                 :            :     unsigned int nBits;
     119                 :          0 :     arith_uint256 hash_arith = UintToArith256(consensus.powLimit);
     120                 :          0 :     nBits = hash_arith.GetCompact();
     121                 :          0 :     hash_arith *= 2; // hash > nBits
     122                 :          0 :     hash = ArithToUint256(hash_arith);
     123                 :          0 :     BOOST_CHECK(!CheckProofOfWork(hash, nBits, consensus));
     124                 :          0 : }
     125                 :            : 
     126                 :          0 : BOOST_AUTO_TEST_CASE(CheckProofOfWork_test_zero_target)
     127                 :            : {
     128                 :          0 :     const auto consensus = CreateChainParams(*m_node.args, ChainType::MAIN)->GetConsensus();
     129                 :          0 :     uint256 hash;
     130                 :            :     unsigned int nBits;
     131                 :          0 :     arith_uint256 hash_arith{0};
     132                 :          0 :     nBits = hash_arith.GetCompact();
     133                 :          0 :     hash = ArithToUint256(hash_arith);
     134                 :          0 :     BOOST_CHECK(!CheckProofOfWork(hash, nBits, consensus));
     135                 :          0 : }
     136                 :            : 
     137                 :          0 : BOOST_AUTO_TEST_CASE(GetBlockProofEquivalentTime_test)
     138                 :            : {
     139                 :          0 :     const auto chainParams = CreateChainParams(*m_node.args, ChainType::MAIN);
     140                 :          0 :     std::vector<CBlockIndex> blocks(10000);
     141                 :          0 :     for (int i = 0; i < 10000; i++) {
     142                 :          0 :         blocks[i].pprev = i ? &blocks[i - 1] : nullptr;
     143                 :          0 :         blocks[i].nHeight = i;
     144                 :          0 :         blocks[i].nTime = 1269211443 + i * chainParams->GetConsensus().nPowTargetSpacing;
     145                 :          0 :         blocks[i].nBits = 0x207fffff; /* target 0x7fffff000... */
     146                 :          0 :         blocks[i].nChainWork = i ? blocks[i - 1].nChainWork + GetBlockProof(blocks[i - 1]) : arith_uint256(0);
     147                 :          0 :     }
     148                 :            : 
     149                 :          0 :     for (int j = 0; j < 1000; j++) {
     150                 :          0 :         CBlockIndex *p1 = &blocks[InsecureRandRange(10000)];
     151                 :          0 :         CBlockIndex *p2 = &blocks[InsecureRandRange(10000)];
     152                 :          0 :         CBlockIndex *p3 = &blocks[InsecureRandRange(10000)];
     153                 :            : 
     154                 :          0 :         int64_t tdiff = GetBlockProofEquivalentTime(*p1, *p2, *p3, chainParams->GetConsensus());
     155                 :          0 :         BOOST_CHECK_EQUAL(tdiff, p1->GetBlockTime() - p2->GetBlockTime());
     156                 :          0 :     }
     157                 :          0 : }
     158                 :            : 
     159                 :          0 : void sanity_check_chainparams(const ArgsManager& args, ChainType chain_type)
     160                 :            : {
     161                 :          0 :     const auto chainParams = CreateChainParams(args, chain_type);
     162                 :          0 :     const auto consensus = chainParams->GetConsensus();
     163                 :            : 
     164                 :            :     // hash genesis is correct
     165                 :          0 :     BOOST_CHECK_EQUAL(consensus.hashGenesisBlock, chainParams->GenesisBlock().GetHash());
     166                 :            : 
     167                 :            :     // target timespan is an even multiple of spacing
     168                 :          0 :     BOOST_CHECK_EQUAL(consensus.nPowTargetTimespan % consensus.nPowTargetSpacing, 0);
     169                 :            : 
     170                 :            :     // genesis nBits is positive, doesn't overflow and is lower than powLimit
     171                 :          0 :     arith_uint256 pow_compact;
     172                 :            :     bool neg, over;
     173                 :          0 :     pow_compact.SetCompact(chainParams->GenesisBlock().nBits, &neg, &over);
     174                 :          0 :     BOOST_CHECK(!neg && pow_compact != 0);
     175                 :          0 :     BOOST_CHECK(!over);
     176                 :          0 :     BOOST_CHECK(UintToArith256(consensus.powLimit) >= pow_compact);
     177                 :            : 
     178                 :            :     // check max target * 4*nPowTargetTimespan doesn't overflow -- see pow.cpp:CalculateNextWorkRequired()
     179                 :          0 :     if (!consensus.fPowNoRetargeting) {
     180                 :          0 :         arith_uint256 targ_max("0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF");
     181                 :          0 :         targ_max /= consensus.nPowTargetTimespan*4;
     182                 :          0 :         BOOST_CHECK(UintToArith256(consensus.powLimit) < targ_max);
     183                 :          0 :     }
     184                 :          0 : }
     185                 :            : 
     186                 :          0 : BOOST_AUTO_TEST_CASE(ChainParams_MAIN_sanity)
     187                 :            : {
     188                 :          0 :     sanity_check_chainparams(*m_node.args, ChainType::MAIN);
     189                 :          0 : }
     190                 :            : 
     191                 :          0 : BOOST_AUTO_TEST_CASE(ChainParams_REGTEST_sanity)
     192                 :            : {
     193                 :          0 :     sanity_check_chainparams(*m_node.args, ChainType::REGTEST);
     194                 :          0 : }
     195                 :            : 
     196                 :          0 : BOOST_AUTO_TEST_CASE(ChainParams_TESTNET_sanity)
     197                 :            : {
     198                 :          0 :     sanity_check_chainparams(*m_node.args, ChainType::TESTNET);
     199                 :          0 : }
     200                 :            : 
     201                 :          0 : BOOST_AUTO_TEST_CASE(ChainParams_SIGNET_sanity)
     202                 :            : {
     203                 :          0 :     sanity_check_chainparams(*m_node.args, ChainType::SIGNET);
     204                 :          0 : }
     205                 :            : 
     206                 :          0 : BOOST_AUTO_TEST_SUITE_END()

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