eme_raw.hpp

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//---------------------------------------------------------------------------//
// Copyright (c) 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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//
// 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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//---------------------------------------------------------------------------//
 
#ifndef CRYPTO3_EME_RAW_HPP
#define CRYPTO3_EME_RAW_HPP
 
#include <nil/crypto3/pkpad/eme.hpp>
 
namespace nil {
    namespace crypto3 {
        namespace pubkey {
            namespace padding {
                template<typename Scheme, typename Hash>
                class eme_raw : public eme<Scheme, Hash> {
                public:
                    virtual size_t maximum_input_size(std::size_t key_bits) const override {
                        return key_bits / 8;
                    }
 
                    template<typename UniformRandomBitGenerator, typename RandomNumberDistribution,
                             typename InputIterator, typename OutputIterator>
                    OutputIterator pad(InputIterator first, InputIterator last, OutputIterator out,
                                       std::size_t key_length,
                                       UniformRandomBitGenerator rand = UniformRandomBitGenerator()) {
                        return std::move(first, last, out);
                    }
 
                    template<typename InputIterator, typename OutputIterator>
                    OutputIterator unpad(InputIterator first, InputIterator last, OutputIterator out) {
                        return ct::strip_leading_zeros(first, static_cast<size_t>(std::distance(first, last)));
                    }
                };
            }    // namespace padding
        }        // namespace pubkey
    }            // namespace crypto3
}    // namespace nil
 
#endif