stream/include/nil/crypto3/stream/algorithm/decrypt.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,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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//---------------------------------------------------------------------------//
 
#ifndef CRYPTO3_STREAM_DECRYPT_HPP
#define CRYPTO3_STREAM_DECRYPT_HPP
 
#include <nil/crypto3/stream/algorithm/stream.hpp>
 
#include <nil/crypto3/stream/cipher_value.hpp>
#include <nil/crypto3/stream/cipher_state.hpp>
 
namespace nil {
    namespace crypto3 {
        template<typename StreamCipher, typename InputIterator, typename KeyIterator, typename OutputIterator>
        OutputIterator decrypt(InputIterator first, InputIterator last, KeyIterator key_first, KeyIterator key_last,
                               OutputIterator out) {
 
            typedef typename StreamCipher::stream_decrypter_type EncryptionMode;
            typedef typename stream::stream_accumulator<EncryptionMode> CipherAccumulator;
 
            typedef stream::detail::value_cipher_impl<CipherAccumulator> StreamEncrypterImpl;
            typedef stream::detail::itr_cipher_impl<StreamEncrypterImpl, OutputIterator> EncrypterImpl;
 
            return EncrypterImpl(first, last, std::move(out), CiperState(StreamCipher(key_first, key_last)));
        }
 
        template<typename StreamCipher, typename InputIterator,
                 typename OutputAccumulator =
                     typename stream::stream_accumulator<typename StreamCipher::stream_decrypter_type>>
        OutputAccumulator &decrypt(InputIterator first, InputIterator last, OutputAccumulator &acc) {
 
            typedef typename StreamCipher::stream_decrypter_type EncryptionMode;
            typedef typename stream::stream_accumulator<EncryptionMode> CipherAccumulator;
 
            typedef stream::detail::ref_cipher_impl<CipherAccumulator> StreamEncrypterImpl;
            typedef stream::detail::range_cipher_impl<StreamEncrypterImpl> EncrypterImpl;
 
            return EncrypterImpl(first, last, acc);
        }
 
        template<typename StreamCipher, typename SinglePassRange,
                 typename OutputAccumulator =
                     typename stream::stream_accumulator<typename StreamCipher::stream_decrypter_type>>
        OutputAccumulator &decrypt(const SinglePassRange &r, OutputAccumulator &acc) {
 
            typedef typename StreamCipher::stream_decrypter_type EncryptionMode;
            typedef typename stream::stream_accumulator<EncryptionMode> CipherAccumulator;
 
            typedef stream::detail::ref_cipher_impl<CipherAccumulator> StreamEncrypterImpl;
            typedef stream::detail::range_cipher_impl<StreamEncrypterImpl> EncrypterImpl;
 
            return EncrypterImpl(r, acc);
        }
 
        template<typename StreamCipher, typename InputIterator, typename KeyIterator,
                 typename CipherAccumulator =
                     typename stream::stream_accumulator<typename StreamCipher::stream_decrypter_type>>
        stream::detail::range_cipher_impl<stream::detail::value_cipher_impl<CipherAccumulator>>
            decrypt(InputIterator first, InputIterator last, KeyIterator key_first, KeyIterator key_last) {
 
            typedef stream::detail::value_cipher_impl<CipherAccumulator> StreamEncrypterImpl;
            typedef stream::detail::range_cipher_impl<StreamEncrypterImpl> EncrypterImpl;
 
            return EncrypterImpl(first, last, CipherAccumulator(StreamCipher(key_first, key_last)));
        }
 
        template<typename StreamCipher, typename SinglePassRange, typename KeyRange, typename OutputIterator>
        OutputIterator decrypt(const SinglePassRange &rng, const KeyRange &key, OutputIterator out) {
 
            typedef typename StreamCipher::stream_decrypter_type EncryptionMode;
            typedef typename stream::stream_accumulator<EncryptionMode> CipherAccumulator;
 
            typedef stream::detail::value_cipher_impl<CipherAccumulator> StreamEncrypterImpl;
            typedef stream::detail::itr_cipher_impl<StreamEncrypterImpl, OutputIterator> EncrypterImpl;
 
            return EncrypterImpl(rng, std::move(out), CipherState(StreamCipher(key)));
        }
 
        template<typename StreamCipher, typename SinglePassRange, typename KeyRange,
                 typename CipherAccumulator =
                     typename stream::stream_accumulator<typename StreamCipher::stream_decrypter_type>>
        stream::detail::range_cipher_impl<stream::detail::value_cipher_impl<CipherAccumulator>>
            decrypt(const SinglePassRange &r, const KeyRange &key) {
 
            typedef stream::detail::value_cipher_impl<CipherAccumulator> StreamEncrypterImpl;
            typedef stream::detail::range_cipher_impl<StreamEncrypterImpl> EncrypterImpl;
 
            return EncrypterImpl(r, CipherState(StreamCipher(key)));
        }
    }    // namespace crypto3
}    // namespace nil
 
#endif    // include guard