shacal.hpp

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//---------------------------------------------------------------------------//
// Copyright (c) 2018-2020 Mikhail Komarov <nemo@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
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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//---------------------------------------------------------------------------//
 
#ifndef CRYPTO3_BLOCK_SHACAL_HPP
#define CRYPTO3_BLOCK_SHACAL_HPP
 
#include <nil/crypto3/block/basic_shacal.hpp>
 
namespace nil {
    namespace crypto3 {
        namespace block {
            class shacal : public basic_shacal {
            public:
                shacal(const key_type &k) : basic_shacal(build_schedule(k)) {
                }
 
                shacal(schedule_type s) : basic_shacal((prepare_schedule(s), s)) {
                }
 
            private:
                static schedule_type build_schedule(const key_type &key) {
                    // Copy key into beginning of round_constants_words
                    schedule_type schedule;
                    for (unsigned t = 0; t < key_words; ++t) {
                        schedule[t] = key[t];
                    }
                    prepare_schedule(schedule);
                    return schedule;
                }
 
                static void prepare_schedule(schedule_type &schedule) {
                    for (unsigned t = key_words; t < rounds; ++t) {
                        schedule[t] = schedule[t - 3] ^ schedule[t - 8] ^ schedule[t - 14] ^ schedule[t - 16];
                    }
                }
            };
 
            typedef shacal shacal0;
 
        }    // namespace block
    }        // namespace crypto3
}    // namespace nil
 
#endif    // CRYPTO3_BLOCK_CIPHERS_SHACAL_HPP