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/*
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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.h
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* @author Gav Wood <i@gavwood.com>
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* @date 2014
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*
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* ProofOfWork algorithm.
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*/
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#pragma once
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#include <chrono>
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#include <thread>
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#include <cstdint>
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#include <libdevcore/Guards.h>
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#include <libdevcrypto/SHA3.h>
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#include <libethash/ethash.h> // TODO: REMOVE once everything merged into this class and an opaque API can be provided.
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static const unsigned c_ethashRevision = REVISION;
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static const unsigned c_ethashEpochLength = EPOCH_LENGTH;
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#undef REVISION
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#undef DATASET_BYTES_INIT
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#undef DATASET_BYTES_GROWTH
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#undef CACHE_BYTES_INIT
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#undef CACHE_BYTES_GROWTH
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#undef DAGSIZE_BYTES_INIT
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#undef DAG_GROWTH
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#undef EPOCH_LENGTH
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#undef MIX_BYTES
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#undef HASH_BYTES
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#undef DATASET_PARENTS
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#undef CACHE_ROUNDS
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#undef ACCESSES
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#include "Common.h"
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#include "BlockInfo.h"
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namespace dev
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{
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namespace eth
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{
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class Ethasher
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{
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public:
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Ethasher() {}
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static Ethasher* get() { if (!s_this) s_this = new Ethasher(); return s_this; }
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bytes const& cache(BlockInfo const& _header);
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bytesConstRef full(BlockInfo const& _header);
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static ethash_params params(BlockInfo const& _header);
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static ethash_params params(unsigned _n);
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struct Result
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{
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h256 value;
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h256 mixHash;
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};
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static Result eval(BlockInfo const& _header) { return eval(_header, _header.nonce); }
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static Result eval(BlockInfo const& _header, Nonce const& _nonce);
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static bool verify(BlockInfo const& _header);
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class Miner
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{
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public:
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Miner(BlockInfo const& _header):
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m_headerHash(_header.headerHash(WithoutNonce)),
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m_params(Ethasher::params(_header)),
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m_datasetPointer(Ethasher::get()->full(_header).data())
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{}
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inline h256 mine(uint64_t _nonce)
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{
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ethash_compute_full(&m_ethashReturn, m_datasetPointer, &m_params, m_headerHash.data(), _nonce);
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return h256(m_ethashReturn.result, h256::ConstructFromPointer);
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}
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inline h256 lastMixHash() const
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{
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return h256(m_ethashReturn.mix_hash, h256::ConstructFromPointer);
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}
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private:
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ethash_return_value m_ethashReturn;
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h256 m_headerHash;
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ethash_params m_params;
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void const* m_datasetPointer;
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};
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private:
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static Ethasher* s_this;
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RecursiveMutex x_this;
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std::map<h256, bytes> m_caches;
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std::map<h256, bytesRef> m_fulls;
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};
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}
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}
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