monero/tests/performance_tests/check_hash.h

// Copyright (c) 2019, The Monero Project
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#pragma once

#include "string_tools.h"
#include "cryptonote_basic/difficulty.h"

template<uint64_t hash_target_high, uint64_t hash_target_low, uint64_t difficulty_high, uint64_t difficulty_low>
class test_check_hash
{
public:
  static const size_t loop_count = 100000;

  bool init()
  {
    cryptonote::difficulty_type hash_target = hash_target_high;
    hash_target = (hash_target << 64) | hash_target_low;
    difficulty = difficulty_high;
    difficulty = (difficulty << 64) | difficulty_low;
    boost::multiprecision::uint256_t hash_value =  std::numeric_limits<boost::multiprecision::uint256_t>::max() / hash_target;
    ((uint64_t*)&hash)[0] = (hash_value << 64 >> 64).convert_to<uint64_t>();
    hash_value >>= 64;
    ((uint64_t*)&hash)[1] = (hash_value << 64 >> 64).convert_to<uint64_t>();
    hash_value >>= 64;
    ((uint64_t*)&hash)[2] = (hash_value << 64 >> 64).convert_to<uint64_t>();
    hash_value >>= 64;
    ((uint64_t*)&hash)[3] = (hash_value << 64 >> 64).convert_to<uint64_t>();
    return true;
  }

  bool test()
  {
    cryptonote::check_hash_128(hash, difficulty);
    return true;
  }

private:
  crypto::hash hash;
  cryptonote::difficulty_type difficulty;
};