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Basic Seed Implementation #2

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40 changes: 40 additions & 0 deletions include/nil/crypto3/block/detail/seed/seed_functions.hpp
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//---------------------------------------------------------------------------//
// Copyright (c) 2018-2020 Mikhail Komarov <nemo@nil.foundation>
//
// Distributed under the Boost Software License, Version 1.0
// See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt
//---------------------------------------------------------------------------//

#ifndef CRYPTO3_SEED_FUNCTIONS_CPP_HPP
#define CRYPTO3_SEED_FUNCTIONS_CPP_HPP

#include <boost/endian/arithmetic.hpp>

#include <nil/crypto3/detail/basic_functions.hpp>

namespace nil {
namespace crypto3 {
namespace block {
namespace detail {
template<std::size_t WordBits>
struct seed_functions : public ::nil::crypto3::detail::basic_functions<WordBits> {
typedef typename ::nil::crypto3::detail::basic_functions<WordBits>::word_type word_type;

constexpr static const std::size_t constants_size = 256;
typedef std::array<word_type, constants_size> constants_type;

inline static word_type g(word_type X, const constants_type &s0, const constants_type &s1,
const constants_type &s2, const constants_type &s3) {
return (s0[::nil::crypto3::detail::extract_uint_t<CHAR_BIT>(X, 3)] ^
s1[::nil::crypto3::detail::extract_uint_t<CHAR_BIT>(X, 2)] ^
s2[::nil::crypto3::detail::extract_uint_t<CHAR_BIT>(X, 1)] ^
s3[::nil::crypto3::detail::extract_uint_t<CHAR_BIT>(X, 0)]);
}
};
} // namespace detail
} // namespace block
} // namespace crypto3
} // namespace nil

#endif // CRYPTO3_SEED_FUNCTIONS_CPP_HPP
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