libcruft-util/hash/siphash.hpp

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/*
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* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
* Copyright 2016-2022 Danny Robson <danny@nerdcruft.net>
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*/
#pragma once
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#include "../view.hpp"
#include <cstdint>
#include <type_traits>
#include <span>
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namespace cruft::hash {
template <int CompressionsV = 2, int FinalisationsV = 4>
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class siphash {
public:
using digest_t = std::uint64_t;
static constexpr auto compression_rounds = CompressionsV;
static constexpr auto finalisation_rounds = FinalisationsV;
siphash (std::array<uint64_t,2>) noexcept;
siphash (std::span<u08, 16>) noexcept;
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digest_t operator() (cruft::view<const std::uint8_t*> data) const noexcept;
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private:
std::array<uint64_t,2> m_key;
};
};