tiger.hpp

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//---------------------------------------------------------------------------//
// Copyright (c) 2018-2020 Mikhail Komarov <nemo@nil.foundation>
// Copyright (c) 2020 Pavel Kharitonov <ipavrus@nil.foundation>
//
// MIT License
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//---------------------------------------------------------------------------//
 
#ifndef CRYPTO3_HASH_TIGER_HPP
#define CRYPTO3_HASH_TIGER_HPP
 
#include <nil/crypto3/hash/detail/tiger/tiger_policy.hpp>
 
#include <nil/crypto3/hash/detail/merkle_damgard_construction.hpp>
#include <nil/crypto3/hash/detail/tiger/tiger_padding.hpp>
#include <nil/crypto3/hash/detail/block_stream_processor.hpp>
 
namespace nil {
    namespace crypto3 {
        namespace hashes {
 
            template<std::size_t DigestBits = 192, std::size_t Passes = 3>
            struct tiger_compressor {
                typedef detail::tiger_policy<DigestBits, Passes> policy_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 state_bits = policy_type::state_bits;
                constexpr static const std::size_t state_words = policy_type::state_words;
                typedef typename policy_type::state_type state_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;
 
                static inline void process_block(state_type &state, const block_type &block) {
 
                    word_type A = state[0], B = state[1], C = state[2];
                    block_type input = block;
                    policy_type::pass(A, B, C, input, 5);
                    policy_type::mix(input);
                    policy_type::pass(C, A, B, input, 7);
                    policy_type::mix(input);
                    policy_type::pass(B, C, A, input, 9);
 
                    for (size_t j = 3; j != policy_type::passes; ++j) {
                        policy_type::mix(input);
                        policy_type::pass(A, B, C, input, 9);
                        word_type T = A;
                        A = C;
                        C = B;
                        B = T;
                    }
 
                    state[0] ^= A;
                    state[1] = B - state[1];
                    state[2] += C;
                }
            };
 
            template<std::size_t DigestBits = 192, std::size_t Passes = 3>
            class tiger {
                typedef detail::tiger_policy<DigestBits, Passes> policy_type;
 
            public:
                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 digest_bits = policy_type::digest_bits;
                typedef typename policy_type::digest_type digest_type;
 
                constexpr static const std::size_t pkcs_id_size = policy_type::pkcs_id_size;
                constexpr static const std::size_t pkcs_id_bits = policy_type::pkcs_id_bits;
                typedef typename policy_type::pkcs_id_type pkcs_id_type;
 
                constexpr static const pkcs_id_type pkcs_id = policy_type::pkcs_id;
 
                struct construction {
                    struct params_type {
                        typedef typename policy_type::digest_endian digest_endian;
 
                        constexpr static const std::size_t length_bits = policy_type::word_bits;
                        constexpr static const std::size_t digest_bits = policy_type::digest_bits;
                    };
 
                    typedef merkle_damgard_construction<params_type, typename policy_type::iv_generator,
                                                        tiger_compressor<DigestBits, Passes>,
                                                        detail::tiger_padding<policy_type>>
                        type;
                };
 
                template<typename StateAccumulator, std::size_t ValueBits>
                struct stream_processor {
                    struct params_type {
                        typedef typename policy_type::digest_endian digest_endian;
 
                        constexpr static const std::size_t value_bits = ValueBits;
                    };
 
                    typedef block_stream_processor<construction, StateAccumulator, params_type> type;
                };
            };
        }    // namespace hashes
    }        // namespace crypto3
}    // namespace nil
 
#endif