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Implement Streebog block cipher #56

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Implement Streebog block cipher #56

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73 changes: 73 additions & 0 deletions include/nil/crypto3/block/detail/streebog/streebog_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_STREEBOG_CIPHER_FUNCTIONS_HPP
#define CRYPTO3_STREEBOG_CIPHER_FUNCTIONS_HPP

#include <boost/endian/arithmetic.hpp>
#include <boost/endian/conversion.hpp>

#include <nil/crypto3/block/detail/streebog/streebog_policy.hpp>

namespace nil {
namespace crypto3 {
namespace block {
namespace detail {
template<std::size_t BlockBits, std::size_t KeyBits>
struct streebog_functions : public streebog_policy<BlockBits, KeyBits> {
typedef streebog_policy<BlockBits, KeyBits> policy_type;

constexpr static const std::size_t rounds = policy_type::rounds;

typedef typename policy_type::byte_type byte_type;

constexpr static const std::size_t word_bits = policy_type::word_bits;
typedef typename policy_type::word_type word_type;

constexpr static const std::size_t block_bits = policy_type::block_bits;
constexpr static const std::size_t block_words = policy_type::block_words;
typedef typename policy_type::block_type block_type;

constexpr static const std::size_t state_bits = block_bits;
constexpr static const std::size_t state_words = block_words;
typedef block_type state_type;

inline static void lps(block_type &block) {
using boost::endian::native_to_little;

std::array<byte_type, block_bits / CHAR_BIT> r;
pack(block, r);

for (int i = 0; i < block_words; ++i) {
block[i] = native_to_little(&policy_type::substitution[0 * policy_type::substitution_words +
r[i + 0 * block_words]]) ^
native_to_little(policy_type::substitution[1 * policy_type::substitution_words +
r[i + 1 * block_words]]) ^
native_to_little(policy_type::substitution[2 * policy_type::substitution_words +
r[i + 2 * block_words]]) ^
native_to_little(policy_type::substitution[3 * policy_type::substitution_words +
r[i + 3 * block_words]]) ^
native_to_little(policy_type::substitution[4 * policy_type::substitution_words +
r[i + 4 * block_words]]) ^
native_to_little(policy_type::substitution[5 * policy_type::substitution_words +
r[i + 5 * block_words]]) ^
native_to_little(policy_type::substitution[6 * policy_type::substitution_words +
r[i + 6 * block_words]]) ^
native_to_little(policy_type::substitution[7 * policy_type::substitution_words +
r[i + 7 * block_words]]);
}

r.fill(0);
}
};
} // namespace detail
} // namespace block
} // namespace crypto3
} // namespace nil

#endif // CRYPTO3_STREEBOG_FUNCTIONS_HPP
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