algebra/include/nil/crypto3/algebra/algorithms/strxor.hpp

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//---------------------------------------------------------------------------//
// Copyright (c) 2020-2021 Mikhail Komarov <nemo@nil.foundation>
// Copyright (c) 2020-2021 Ilias Khairullin <ilias@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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// SOFTWARE.
//---------------------------------------------------------------------------//
 
#ifndef CRYPTO3_STRXOR_HPP
#define CRYPTO3_STRXOR_HPP
 
#include <boost/concept/assert.hpp>
#include <boost/assert.hpp>
 
#include <iterator>
 
namespace nil {
    namespace crypto3 {
        namespace algebra {
            template<typename InputIterator1, typename InputIterator2, typename OutputIterator>
            constexpr inline
                typename std::enable_if<std::is_same<typename std::iterator_traits<InputIterator1>::value_type,
                                                     typename std::iterator_traits<InputIterator2>::value_type>::value,
                                        OutputIterator>::type
                strxor(InputIterator1 first1, InputIterator1 last1, InputIterator2 first2, InputIterator2 last2,
                       OutputIterator out) {
                BOOST_ASSERT(std::distance(first1, last1) == std::distance(first2, last2));
 
                while (first1 != last1 && first2 != last2) {
                    *out++ = *first1++ ^ *first2++;
                }
            }
 
            template<typename InputType, typename OutputType>
            constexpr inline void strxor(const InputType &in1, const InputType &in2, OutputType &out) {
                BOOST_CONCEPT_ASSERT((boost::SinglePassRangeConcept<InputType>));
                BOOST_CONCEPT_ASSERT((boost::SinglePassRangeConcept<OutputType>));
                BOOST_CONCEPT_ASSERT((boost::WriteableRangeConcept<OutputType>));
 
                BOOST_ASSERT(std::distance(in1.begin(), in1.end()) == std::distance(in2.begin(), in2.end()) &&
                             std::distance(in1.begin(), in1.end()) == std::distance(out.begin(), out.end()));
 
                auto in1_i = in1.begin();
                auto in2_i = in2.begin();
                auto out_i = out.begin();
                while (in1_i != in1.end() && in2_i != in2.end()) {
                    *out_i++ = *in1_i++ ^ *in2_i++;
                }
            }
        }    // namespace algebra
    }        // namespace crypto3
}    // namespace nil
 
#endif    // CRYPTO3_STRXOR_HPP