// Copyright (c) 2015-2019 The Bitcoin Core developers // Distributed under the MIT software license, see the accompanying // file COPYING or http://www.opensource.org/licenses/mit-license.php. #include #include #include #include #include BOOST_FIXTURE_TEST_SUITE(pow_tests, BasicTestingSetup) /* Test calculation of next difficulty target with no constraints applying */ BOOST_AUTO_TEST_CASE(get_next_work) { const auto chainParams = CreateChainParams(*m_node.args, CBaseChainParams::MAIN); // MoonBite: 60 blocks took 9000 s instead of the 7200 s target (1.25x), so // the target loosens by 1.25x with no clamp applied. int64_t nLastRetargetTime = 1358118740; CBlockIndex pindexLast; pindexLast.nHeight = 59; pindexLast.nTime = 1358118740 + 9000; pindexLast.nBits = 0x1c0ac141; BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, chainParams->GetConsensus()), 0x1c0d7191U); } /* Test the constraint on the upper bound for next work */ BOOST_AUTO_TEST_CASE(get_next_work_pow_limit) { const auto chainParams = CreateChainParams(*m_node.args, CBaseChainParams::MAIN); // MoonBite: at the genesis floor (0x1f0ffff0) with slow blocks the result // is clamped to powLimit (0x1f0fffff). This also exercises the overflow // headroom in CalculateNextWorkRequired: target * 28800 exceeds 256 bits. int64_t nLastRetargetTime = 1756479600; CBlockIndex pindexLast; pindexLast.nHeight = 59; pindexLast.nTime = 1756479600 + 100000; pindexLast.nBits = 0x1f0ffff0; BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, chainParams->GetConsensus()), 0x1f0fffffU); } /* Test the constraint on the lower bound for actual time taken */ BOOST_AUTO_TEST_CASE(get_next_work_lower_limit_actual) { const auto chainParams = CreateChainParams(*m_node.args, CBaseChainParams::MAIN); // MoonBite: 60 blocks in 100 s is clamped to timespan/4 -> target / 4. int64_t nLastRetargetTime = 1401682934; CBlockIndex pindexLast; pindexLast.nHeight = 119; pindexLast.nTime = 1401682934 + 100; pindexLast.nBits = 0x1b075cf1; BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, chainParams->GetConsensus()), 0x1b01d73cU); } /* Test the constraint on the upper bound for actual time taken */ BOOST_AUTO_TEST_CASE(get_next_work_upper_limit_actual) { const auto chainParams = CreateChainParams(*m_node.args, CBaseChainParams::MAIN); // MoonBite: 60 blocks in 100000 s is clamped to timespan*4 -> target * 4. int64_t nLastRetargetTime = 1463690315; CBlockIndex pindexLast; pindexLast.nHeight = 179; pindexLast.nTime = 1463690315 + 100000; pindexLast.nBits = 0x1b015318; BOOST_CHECK_EQUAL(CalculateNextWorkRequired(&pindexLast, nLastRetargetTime, chainParams->GetConsensus()), 0x1b054c60U); } BOOST_AUTO_TEST_CASE(CheckProofOfWork_test_negative_target) { const auto consensus = CreateChainParams(*m_node.args, CBaseChainParams::MAIN)->GetConsensus(); uint256 hash; unsigned int nBits; nBits = UintToArith256(consensus.powLimit).GetCompact(true); hash.SetHex("0x1"); BOOST_CHECK(!CheckProofOfWork(hash, nBits, consensus)); } BOOST_AUTO_TEST_CASE(CheckProofOfWork_test_overflow_target) { const auto consensus = CreateChainParams(*m_node.args, CBaseChainParams::MAIN)->GetConsensus(); uint256 hash; unsigned int nBits = ~0x00800000; hash.SetHex("0x1"); BOOST_CHECK(!CheckProofOfWork(hash, nBits, consensus)); } BOOST_AUTO_TEST_CASE(CheckProofOfWork_test_too_easy_target) { const auto consensus = CreateChainParams(*m_node.args, CBaseChainParams::MAIN)->GetConsensus(); uint256 hash; unsigned int nBits; arith_uint256 nBits_arith = UintToArith256(consensus.powLimit); nBits_arith *= 2; nBits = nBits_arith.GetCompact(); hash.SetHex("0x1"); BOOST_CHECK(!CheckProofOfWork(hash, nBits, consensus)); } BOOST_AUTO_TEST_CASE(CheckProofOfWork_test_biger_hash_than_target) { const auto consensus = CreateChainParams(*m_node.args, CBaseChainParams::MAIN)->GetConsensus(); uint256 hash; unsigned int nBits; arith_uint256 hash_arith = UintToArith256(consensus.powLimit); nBits = hash_arith.GetCompact(); hash_arith *= 2; // hash > nBits hash = ArithToUint256(hash_arith); BOOST_CHECK(!CheckProofOfWork(hash, nBits, consensus)); } BOOST_AUTO_TEST_CASE(CheckProofOfWork_test_zero_target) { const auto consensus = CreateChainParams(*m_node.args, CBaseChainParams::MAIN)->GetConsensus(); uint256 hash; unsigned int nBits; arith_uint256 hash_arith{0}; nBits = hash_arith.GetCompact(); hash = ArithToUint256(hash_arith); BOOST_CHECK(!CheckProofOfWork(hash, nBits, consensus)); } BOOST_AUTO_TEST_CASE(GetBlockProofEquivalentTime_test) { const auto chainParams = CreateChainParams(*m_node.args, CBaseChainParams::MAIN); std::vector blocks(10000); for (int i = 0; i < 10000; i++) { blocks[i].pprev = i ? &blocks[i - 1] : nullptr; blocks[i].nHeight = i; blocks[i].nTime = 1269211443 + i * chainParams->GetConsensus().nPowTargetSpacing; blocks[i].nBits = 0x207fffff; /* target 0x7fffff000... */ blocks[i].nChainWork = i ? blocks[i - 1].nChainWork + GetBlockProof(blocks[i - 1]) : arith_uint256(0); } for (int j = 0; j < 1000; j++) { CBlockIndex *p1 = &blocks[InsecureRandRange(10000)]; CBlockIndex *p2 = &blocks[InsecureRandRange(10000)]; CBlockIndex *p3 = &blocks[InsecureRandRange(10000)]; int64_t tdiff = GetBlockProofEquivalentTime(*p1, *p2, *p3, chainParams->GetConsensus()); BOOST_CHECK_EQUAL(tdiff, p1->GetBlockTime() - p2->GetBlockTime()); } } void sanity_check_chainparams(const ArgsManager& args, std::string chainName) { const auto chainParams = CreateChainParams(args, chainName); const auto consensus = chainParams->GetConsensus(); // hash genesis is correct BOOST_CHECK_EQUAL(consensus.hashGenesisBlock, chainParams->GenesisBlock().GetHash()); // target timespan is an even multiple of spacing BOOST_CHECK_EQUAL(consensus.nPowTargetTimespan % consensus.nPowTargetSpacing, 0); // genesis nBits is positive, doesn't overflow and is lower than powLimit arith_uint256 pow_compact; bool neg, over; pow_compact.SetCompact(chainParams->GenesisBlock().nBits, &neg, &over); BOOST_CHECK(!neg && pow_compact != 0); BOOST_CHECK(!over); BOOST_CHECK(UintToArith256(consensus.powLimit) >= pow_compact); // check max target * 4*nPowTargetTimespan doesn't overflow -- see pow.cpp:CalculateNextWorkRequired() /* Litecoin: we allow overflowing by 1 bit if (!consensus.fPowNoRetargeting) { arith_uint256 targ_max("0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"); targ_max /= consensus.nPowTargetTimespan*4; BOOST_CHECK(UintToArith256(consensus.powLimit) < targ_max); } */ } BOOST_AUTO_TEST_CASE(ChainParams_MAIN_sanity) { sanity_check_chainparams(*m_node.args, CBaseChainParams::MAIN); } BOOST_AUTO_TEST_CASE(ChainParams_REGTEST_sanity) { sanity_check_chainparams(*m_node.args, CBaseChainParams::REGTEST); } BOOST_AUTO_TEST_CASE(ChainParams_TESTNET_sanity) { sanity_check_chainparams(*m_node.args, CBaseChainParams::TESTNET); } BOOST_AUTO_TEST_CASE(ChainParams_SIGNET_sanity) { sanity_check_chainparams(*m_node.args, CBaseChainParams::SIGNET); } BOOST_AUTO_TEST_SUITE_END()