59 lines
1.6 KiB
C++
59 lines
1.6 KiB
C++
/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* Copyright 2016-2022 Danny Robson <danny@nerdcruft.net>
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*/
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#pragma once
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#include "../view.hpp"
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#include <cstdint>
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#include <type_traits>
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#include <span>
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namespace cruft::hash {
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constexpr int SIPHASH_DEFAULT_COMPRESSIONS = 2;
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constexpr int SIPHASH_DEFAULT_FINALISATIONS = 4;
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template <
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int CompressionsV = SIPHASH_DEFAULT_COMPRESSIONS,
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int FinalisationsV = SIPHASH_DEFAULT_FINALISATIONS,
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int OutV = 8
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>
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class siphash {
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public:
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static_assert (OutV == 8 or OutV == 16);
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static constexpr auto output_length = OutV;
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static constexpr auto compression_rounds = CompressionsV;
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static constexpr auto finalisation_rounds = FinalisationsV;
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using digest_t = std::array<u08, output_length>;
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siphash (std::array<u64, 2>) noexcept;
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siphash (std::span<u08, 16>) noexcept;
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digest_t operator() (cruft::view<u08 const*> data) const noexcept;
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private:
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std::array<u64, 2> m_key;
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};
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template <
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int CompressionsV = SIPHASH_DEFAULT_COMPRESSIONS,
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int FinalisationsV = SIPHASH_DEFAULT_FINALISATIONS
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>
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using siphash64 = siphash<CompressionsV, FinalisationsV, 8>;
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template <
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int CompressionsV = SIPHASH_DEFAULT_COMPRESSIONS,
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int FinalisationsV = SIPHASH_DEFAULT_FINALISATIONS
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>
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using siphash128 = siphash<CompressionsV, FinalisationsV, 16>;
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} |