103 lines
2.6 KiB
C++
103 lines
2.6 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 2018-2019 Danny Robson <danny@nerdcruft.net>
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*/
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#pragma once
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#include <cruft/util/std.hpp>
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#include <cruft/util/view.hpp>
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#include <array>
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#include <cstdint>
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#include <cstdlib>
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///////////////////////////////////////////////////////////////////////////////
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namespace cruft::crypto::hash {
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///////////////////////////////////////////////////////////////////////////
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template <int>
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struct traits {};
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//-------------------------------------------------------------------------
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template <>
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struct traits<256>
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{
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using word_t = u32;
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static const std::array<word_t,8> iv;
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static const std::array<word_t,16> pi;
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static const std::array<int,4> rotations;
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static constexpr int rounds = 14;
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};
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//-------------------------------------------------------------------------
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template <>
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struct traits<224>
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{
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using word_t = traits<256>::word_t;
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};
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//-------------------------------------------------------------------------
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template <>
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struct traits<512>
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{
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using word_t = u64;
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static const std::array<word_t,8> iv;
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static const std::array<word_t,16> pi;
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static const std::array<int,4> rotations;
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static constexpr int rounds = 16;
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};
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//-------------------------------------------------------------------------
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template <>
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struct traits<384>
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{
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using word_t = traits<512>::word_t;
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};
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/// an implementation of the BLAKE hash function
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///
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/// note that this is _not_ BLAKE2, but the original SHA-3 candidate
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/// function.
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///
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/// \tparam width the number of bits for the digest
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template <int width>
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class blake {
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public:
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using word_t = typename traits<width>::word_t;
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// size of each round's data block in bytes
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static const size_t block_size = 16 * sizeof (word_t);
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// size of the digest in bytes
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static const size_t digest_size = width / 8;
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using digest_t = std::array<u08,digest_size>;
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digest_t operator() (
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cruft::view<const u08*> data,
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cruft::view<const u08*> salt
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) const;
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digest_t operator() (cruft::view<const u08*> data,
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const std::array<word_t,4> salt) const noexcept;
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digest_t operator() (cruft::view<const u08*> data) const noexcept
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{
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return (*this) (data, {0,0,0,0});
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}
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};
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}
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