diff options
Diffstat (limited to 'src/test/fuzz/pow.cpp')
-rw-r--r-- | src/test/fuzz/pow.cpp | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/src/test/fuzz/pow.cpp b/src/test/fuzz/pow.cpp index 0004d82d66..eba03da773 100644 --- a/src/test/fuzz/pow.cpp +++ b/src/test/fuzz/pow.cpp @@ -83,3 +83,40 @@ FUZZ_TARGET_INIT(pow, initialize_pow) } } } + + +FUZZ_TARGET_INIT(pow_transition, initialize_pow) +{ + FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size()); + const Consensus::Params& consensus_params{Params().GetConsensus()}; + std::vector<std::unique_ptr<CBlockIndex>> blocks; + + const uint32_t old_time{fuzzed_data_provider.ConsumeIntegral<uint32_t>()}; + const uint32_t new_time{fuzzed_data_provider.ConsumeIntegral<uint32_t>()}; + const int32_t version{fuzzed_data_provider.ConsumeIntegral<int32_t>()}; + uint32_t nbits{fuzzed_data_provider.ConsumeIntegral<uint32_t>()}; + + const arith_uint256 pow_limit = UintToArith256(consensus_params.powLimit); + arith_uint256 old_target; + old_target.SetCompact(nbits); + if (old_target > pow_limit) { + nbits = pow_limit.GetCompact(); + } + // Create one difficulty adjustment period worth of headers + for (int height = 0; height < consensus_params.DifficultyAdjustmentInterval(); ++height) { + CBlockHeader header; + header.nVersion = version; + header.nTime = old_time; + header.nBits = nbits; + if (height == consensus_params.DifficultyAdjustmentInterval() - 1) { + header.nTime = new_time; + } + auto current_block{std::make_unique<CBlockIndex>(header)}; + current_block->pprev = blocks.empty() ? nullptr : blocks.back().get(); + current_block->nHeight = height; + blocks.emplace_back(std::move(current_block)); + } + auto last_block{blocks.back().get()}; + unsigned int new_nbits{GetNextWorkRequired(last_block, nullptr, consensus_params)}; + Assert(PermittedDifficultyTransition(consensus_params, last_block->nHeight + 1, last_block->nBits, new_nbits)); +} |