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125 lines
3.8 KiB
125 lines
3.8 KiB
/*
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This file is part of cpp-ethereum.
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cpp-ethereum is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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cpp-ethereum is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file Ethasher.cpp
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* @author Gav Wood <i@gavwood.com>
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* @date 2014
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*/
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#include <boost/detail/endian.hpp>
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#include <boost/filesystem.hpp>
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#include <chrono>
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#include <array>
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#include <random>
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#include <thread>
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#include <libdevcore/Common.h>
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#include <libdevcore/Guards.h>
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#include <libdevcore/Log.h>
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#include <libdevcrypto/CryptoPP.h>
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#include <libdevcrypto/FileSystem.h>
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#include <libethcore/Params.h>
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#include "BlockInfo.h"
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#include "Ethasher.h"
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using namespace std;
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using namespace chrono;
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using namespace dev;
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using namespace eth;
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Ethasher* dev::eth::Ethasher::s_this = nullptr;
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bytes const& Ethasher::cache(BlockInfo const& _header)
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{
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RecursiveGuard l(x_this);
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if (_header.number > c_ethashEpochLength * 2048) {
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std::ostringstream error;
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error << "block number is too high; max is " << c_ethashEpochLength * 2048 << "(was " << _header.number << ")";
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throw std::invalid_argument( error.str() );
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}
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if (!m_caches.count(_header.seedHash()))
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{
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ethash_params p = params((unsigned)_header.number);
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m_caches[_header.seedHash()].resize(p.cache_size);
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ethash_prep_light(m_caches[_header.seedHash()].data(), &p, _header.seedHash().data());
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}
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return m_caches[_header.seedHash()];
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}
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bytesConstRef Ethasher::full(BlockInfo const& _header)
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{
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RecursiveGuard l(x_this);
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if (!m_fulls.count(_header.seedHash()))
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{
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if (!m_fulls.empty())
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{
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delete [] m_fulls.begin()->second.data();
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m_fulls.erase(m_fulls.begin());
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}
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try {
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boost::filesystem::create_directories(getDataDir() + "/ethashcache");
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} catch (...) {}
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std::string memoFile = getDataDir() + "/ethashcache/" + toHex(_header.seedHash().ref().cropped(0, 4)) + ".full";
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m_fulls[_header.seedHash()] = contentsNew(memoFile);
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if (!m_fulls[_header.seedHash()])
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{
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ethash_params p = params((unsigned)_header.number);
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m_fulls[_header.seedHash()] = bytesRef(new byte[p.full_size], p.full_size);
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auto c = cache(_header);
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ethash_prep_full(m_fulls[_header.seedHash()].data(), &p, c.data());
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writeFile(memoFile, m_fulls[_header.seedHash()]);
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}
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}
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return m_fulls[_header.seedHash()];
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}
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ethash_params Ethasher::params(BlockInfo const& _header)
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{
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return params((unsigned)_header.number);
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}
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ethash_params Ethasher::params(unsigned _n)
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{
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ethash_params p;
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p.cache_size = ethash_get_cachesize(_n);
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p.full_size = ethash_get_datasize(_n);
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return p;
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}
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bool Ethasher::verify(BlockInfo const& _header)
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{
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if (_header.number >= c_ethashEpochLength * 2048)
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return false;
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h256 boundary = u256((bigint(1) << 256) / _header.difficulty);
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// should be equivalent to:
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auto r = eval(_header);
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return r.mixHash == _header.mixHash && r.value <= boundary;
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return ethash_quick_check_difficulty(
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_header.headerHash(WithoutNonce).data(),
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(uint64_t)(u64)_header.nonce,
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_header.mixHash.data(),
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boundary.data());
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}
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Ethasher::Result Ethasher::eval(BlockInfo const& _header, Nonce const& _nonce)
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{
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auto p = Ethasher::params(_header);
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ethash_return_value r;
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ethash_compute_light(&r, Ethasher::get()->cache(_header).data(), &p, _header.headerHash(WithoutNonce).data(), (uint64_t)(u64)_nonce);
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return Result{h256(r.result, h256::ConstructFromPointer), h256(r.mix_hash, h256::ConstructFromPointer)};
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}
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