matyas_meyer_oseas_compressor.hpp

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//---------------------------------------------------------------------------//
// Copyright (c) 2018-2020 Mikhail Komarov <nemo@nil.foundation>
//
// MIT License
//
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// of this software and associated documentation files (the "Software"), to deal
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//---------------------------------------------------------------------------//
 
#ifndef CRYPTO3_MATYAS_MEYER_OSEAS_COMPRESSOR_HPP
#define CRYPTO3_MATYAS_MEYER_OSEAS_COMPRESSOR_HPP
 
namespace nil {
    namespace crypto3 {
        namespace hash {
            template<typename BlockCipher, typename CombineFunction, typename KeyConverterFunctor>
            struct matyas_meyer_oseas_compressor {
                typedef BlockCipher block_cipher_type;
 
                constexpr static const std::size_t word_bits = block_cipher_type::word_bits;
                typedef typename block_cipher_type::word_type word_type;
 
                constexpr static const std::size_t key_bits = block_cipher_type::key_bits;
                typedef typename block_cipher_type::key_type key_type;
 
                constexpr static const std::size_t state_bits = block_cipher_type::block_bits;
                constexpr static const std::size_t state_words = block_cipher_type::block_words;
                typedef typename block_cipher_type::block_type state_type;
 
                constexpr static const std::size_t block_bits = block_cipher_type::key_bits;
                constexpr static const std::size_t block_words = block_cipher_type::key_words;
                typedef typename block_cipher_type::block_type block_type;
 
                static inline void process_block(state_type &state, const block_type &block) {
                    KeyConverterFunctor k;
                    key_type key = {0};
                    k(key, state);
 
                    block_cipher_type cipher(key);
                    state_type new_state = cipher.encrypt(block);
 
                    CombineFunction f;
                    f(new_state, block);
                    state = new_state;
                }
            };
        }    // namespace hash
    }        // namespace crypto3
}    // namespace nil
 
#endif    // CRYPTO3_MATYAS_MEYER_OSEAS_COMPRESSOR_HPP