shacal_functions.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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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// furnished to do so, subject to the following conditions:
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// The above copyright notice and this permission notice shall be included in all
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//---------------------------------------------------------------------------//
 
#ifndef CRYPTO3_BLOCK_CIPHERS_DETAIL_SHACAL_FUNCTIONS_HPP
#define CRYPTO3_BLOCK_CIPHERS_DETAIL_SHACAL_FUNCTIONS_HPP
 
#include <nil/crypto3/detail/basic_functions.hpp>
 
namespace nil {
    namespace crypto3 {
        namespace block {
            namespace detail {
 
                template<std::size_t WordBits>
                struct basic_shacal_functions : public ::nil::crypto3::detail::basic_functions<WordBits> {
                    typedef typename ::nil::crypto3::detail::basic_functions<WordBits>::word_type word_type;
 
                    static word_type Ch(word_type x, word_type y, word_type z) {
                        return (x & y) ^ (~x & z);
                    }
 
                    static word_type Maj(word_type x, word_type y, word_type z) {
                        return (x & y) ^ (x & z) ^ (y & z);
                    }
                };
 
                struct shacal_functions : public basic_shacal_functions<32> {
                    static word_type Parity(word_type x, word_type y, word_type z) {
                        return x ^ y ^ z;
                    }
 
                    static word_type f(unsigned t, word_type x, word_type y, word_type z) {
                        if (t < 40) {
                            if (t < 20) {
                                return Ch(x, y, z);
                            }
                        } else {
                            if (t < 60) {
                                return Maj(x, y, z);
                            }
                        }
                        return Parity(x, y, z);
                    }
                };
 
                typedef shacal_functions shacal0_functions;
                typedef shacal_functions shacal1_functions;
 
                template<std::size_t WordBits>
                struct shacal2_functions;
 
                template<>
                struct shacal2_functions<32> : public basic_shacal_functions<32> {
                    static word_type Sigma_0(word_type x) {
                        return rotr<2>(x) ^ rotr<13>(x) ^ rotr<22>(x);
                    }
 
                    static word_type Sigma_1(word_type x) {
                        return rotr<6>(x) ^ rotr<11>(x) ^ rotr<25>(x);
                    }
 
                    static word_type sigma_0(word_type x) {
                        return rotr<7>(x) ^ rotr<18>(x) ^ shr<3>(x);
                    }
 
                    static word_type sigma_1(word_type x) {
                        return rotr<17>(x) ^ rotr<19>(x) ^ shr<10>(x);
                    }
                };
 
                template<>
                struct shacal2_functions<64> : public basic_shacal_functions<64> {
                    static word_type Sigma_0(word_type x) {
                        return rotr<28>(x) ^ rotr<34>(x) ^ rotr<39>(x);
                    }
 
                    static word_type Sigma_1(word_type x) {
                        return rotr<14>(x) ^ rotr<18>(x) ^ rotr<41>(x);
                    }
 
                    static word_type sigma_0(word_type x) {
                        return rotr<1>(x) ^ rotr<8>(x) ^ shr<7>(x);
                    }
 
                    static word_type sigma_1(word_type x) {
                        return rotr<19>(x) ^ rotr<61>(x) ^ shr<6>(x);
                    }
                };
 
            }    // namespace detail
        }        // namespace block
    }            // namespace crypto3
}    // namespace nil
 
#endif    // CRYPTO3_BLOCK_CIPHERS_DETAIL_SHACAL_FUNCTIONS_HPP