// Copyright (c) 2014-2019, The Monero Project
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
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// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
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// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
#pragma once
#include <cstdint>
#include <vector>
#include "crypto/hash.h"
namespace cryptonote
{
typedef std::uint64_t difficulty_type;
/**
* @brief checks if a hash fits the given difficulty
*
* The hash passes if (hash * difficulty) < 2^256.
* Phrased differently, if (hash * difficulty) fits without overflow into
* the least significant 256 bits of the 320 bit multiplication result.
*
* @param hash the hash to check
* @param difficulty the difficulty to check against
*
* @return true if valid, else false
*/
bool check_hash(const crypto::hash &hash, difficulty_type difficulty);
difficulty_type next_difficulty(std::vector<std::uint64_t> timestamps, std::vector<difficulty_type> cumulative_difficulties, size_t target_seconds);
}
