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// Copyright (c) 2020-2022 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 <chain.h>
#include <chainparams.h>
#include <pow.h>
#include <primitives/block.h>
#include <test/fuzz/FuzzedDataProvider.h>
#include <test/fuzz/fuzz.h>
#include <test/fuzz/util.h>
#include <util/chaintype.h>
#include <util/check.h>
#include <util/overflow.h>
#include <cstdint>
#include <optional>
#include <string>
#include <vector>
void initialize_pow()
{
SelectParams(ChainType::MAIN);
}
FUZZ_TARGET(pow, .init = 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 fixed_time = fuzzed_data_provider.ConsumeIntegral<uint32_t>();
const uint32_t fixed_bits = fuzzed_data_provider.ConsumeIntegral<uint32_t>();
LIMITED_WHILE(fuzzed_data_provider.remaining_bytes() > 0, 10000) {
const std::optional<CBlockHeader> block_header = ConsumeDeserializable<CBlockHeader>(fuzzed_data_provider);
if (!block_header) {
continue;
}
CBlockIndex& current_block{
*blocks.emplace_back(std::make_unique<CBlockIndex>(*block_header))};
{
CBlockIndex* previous_block = blocks.empty() ? nullptr : PickValue(fuzzed_data_provider, blocks).get();
const int current_height = (previous_block != nullptr && previous_block->nHeight != std::numeric_limits<int>::max()) ? previous_block->nHeight + 1 : 0;
if (fuzzed_data_provider.ConsumeBool()) {
current_block.pprev = previous_block;
}
if (fuzzed_data_provider.ConsumeBool()) {
current_block.nHeight = current_height;
}
if (fuzzed_data_provider.ConsumeBool()) {
const uint32_t seconds = current_height * consensus_params.nPowTargetSpacing;
if (!AdditionOverflow(fixed_time, seconds)) {
current_block.nTime = fixed_time + seconds;
}
}
if (fuzzed_data_provider.ConsumeBool()) {
current_block.nBits = fixed_bits;
}
if (fuzzed_data_provider.ConsumeBool()) {
current_block.nChainWork = previous_block != nullptr ? previous_block->nChainWork + GetBlockProof(*previous_block) : arith_uint256{0};
} else {
current_block.nChainWork = ConsumeArithUInt256(fuzzed_data_provider);
}
}
{
(void)GetBlockProof(current_block);
(void)CalculateNextWorkRequired(¤t_block, fuzzed_data_provider.ConsumeIntegralInRange<int64_t>(0, std::numeric_limits<int64_t>::max()), consensus_params);
if (current_block.nHeight != std::numeric_limits<int>::max() && current_block.nHeight - (consensus_params.DifficultyAdjustmentInterval() - 1) >= 0) {
(void)GetNextWorkRequired(¤t_block, &(*block_header), consensus_params);
}
}
{
const auto& to = PickValue(fuzzed_data_provider, blocks);
const auto& from = PickValue(fuzzed_data_provider, blocks);
const auto& tip = PickValue(fuzzed_data_provider, blocks);
try {
(void)GetBlockProofEquivalentTime(*to, *from, *tip, consensus_params);
} catch (const uint_error&) {
}
}
{
const std::optional<uint256> hash = ConsumeDeserializable<uint256>(fuzzed_data_provider);
if (hash) {
(void)CheckProofOfWorkImpl(*hash, fuzzed_data_provider.ConsumeIntegral<unsigned int>(), consensus_params);
}
}
}
}
FUZZ_TARGET(pow_transition, .init = 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));
}
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