ecb.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
// 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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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//---------------------------------------------------------------------------//
 
#ifndef CRYPTO3_BLOCK_MODE_ELECTRONIC_CODE_BOOK_HPP
#define CRYPTO3_BLOCK_MODE_ELECTRONIC_CODE_BOOK_HPP
 
#include <boost/integer.hpp>
 
#include <nil/crypto3/modes/mode.hpp>
#include <nil/crypto3/modes/cts.hpp>
 
#include <nil/crypto3/codec/algorithm/encode.hpp>
 
//#include <nil/crypto3/codec/logic.hpp>
 
namespace nil {
    namespace crypto3 {
        namespace block {
            namespace modes {
                namespace detail {
                    template<typename Cipher, typename Padding, template<typename> class Allocator = std::allocator>
                    struct ecb_policy {
                        typedef std::size_t size_type;
 
                        typedef Cipher cipher_type;
                        typedef Padding padding_type;
 
                        constexpr static const size_type block_bits = cipher_type::block_bits;
                        constexpr static const size_type block_words = cipher_type::block_words;
                        typedef typename cipher_type::block_type block_type;
                    };
 
                    template<typename Cipher, typename Padding, typename CiphertextStealingMode>
                    struct ecb_encryption_policy : public ecb_policy<Cipher, Padding> {};
 
                    template<typename Cipher, typename Padding>
                    struct ecb_encryption_policy<Cipher, Padding, cts<0, Cipher, Padding>>
                        : public ecb_policy<Cipher, Padding> {
                        typedef typename ecb_policy<Cipher, Padding>::size_type size_type;
 
                        typedef typename ecb_policy<Cipher, Padding>::cipher_type cipher_type;
                        typedef typename ecb_policy<Cipher, Padding>::padding_type padding_type;
 
                        constexpr static const size_type block_bits = ecb_policy<Cipher, Padding>::block_bits;
                        constexpr static const size_type block_words = ecb_policy<Cipher, Padding>::block_words;
                        typedef typename ecb_policy<Cipher, Padding>::block_type block_type;
 
                        block_type begin_message(const cipher_type &cipher, const block_type &plaintext) {
                            return cipher.encrypt(plaintext);
                        }
 
                        block_type process_block(const cipher_type &cipher, const block_type &plaintext) {
                            return cipher.encrypt(plaintext);
                        }
 
                        block_type end_message(const cipher_type &cipher, const block_type &plaintext) {
                            const size_type rem = len % block_size;
                            if (rem || padding_type::always_pad) {
                                unsigned char block[block_size];
                                std::memcpy(block, in, rem);
                                padding_type::pad(block, block_size, rem);
                                c_.encrypt_block(block, <#initializer #>);
                            }
                        }
                    };
 
                    template<typename Cipher, typename Padding>
                    struct ecb_encryption_policy<Cipher, Padding, cts<1, Cipher, Padding>>
                        : public ecb_policy<Cipher, Padding> {
                        typedef typename ecb_policy<Cipher, Padding>::size_type size_type;
 
                        typedef typename ecb_policy<Cipher, Padding>::cipher_type cipher_type;
                        typedef typename ecb_policy<Cipher, Padding>::padding_type padding_type;
 
                        constexpr static const size_type block_bits = ecb_policy<Cipher, Padding>::block_bits;
                        constexpr static const size_type block_words = ecb_policy<Cipher, Padding>::block_words;
                        typedef typename ecb_policy<Cipher, Padding>::block_type block_type;
 
                        block_type begin_message(const cipher_type &cipher, const block_type &plaintext) {
                            return cipher.encrypt(plaintext);
                        }
 
                        block_type process_block(const cipher_type &cipher, const block_type &plaintext) {
                            return cipher.encrypt(plaintext);
                        }
 
                        block_type end_message(const cipher_type &cipher, const block_type &plaintext) {
                            const size_type rem = len % block_size;
                            if (rem || padding_type::always_pad) {
                                unsigned char block[block_size];
                                std::memcpy(block, in, rem);
                                padding_type::pad(block, block_size, rem);
                                c_.encrypt_block(block, <#initializer #>);
                            }
                        }
                    };
 
                    template<typename Cipher, typename Padding>
                    struct ecb_encryption_policy<Cipher, Padding, cts<2, Cipher, Padding>>
                        : public ecb_policy<Cipher, Padding> {
                        typedef typename ecb_policy<Cipher, Padding>::size_type size_type;
 
                        typedef typename ecb_policy<Cipher, Padding>::cipher_type cipher_type;
                        typedef typename ecb_policy<Cipher, Padding>::padding_type padding_type;
 
                        constexpr static const size_type block_bits = ecb_policy<Cipher, Padding>::block_bits;
                        constexpr static const size_type block_words = ecb_policy<Cipher, Padding>::block_words;
                        typedef typename ecb_policy<Cipher, Padding>::block_type block_type;
 
                        block_type begin_message(const cipher_type &cipher, const block_type &plaintext) {
                            return cipher.encrypt(plaintext);
                        }
 
                        block_type process_block(const cipher_type &cipher, const block_type &plaintext) {
                            return cipher.encrypt(plaintext);
                        }
 
                        block_type end_message(const cipher_type &cipher, const block_type &plaintext) {
                            const size_type rem = len % block_size;
                            if (rem || padding_type::always_pad) {
                                unsigned char block[block_size];
                                std::memcpy(block, in, rem);
                                padding_type::pad(block, block_size, rem);
                                c_.encrypt_block(block, <#initializer #>);
                            }
                        }
                    };
 
                    template<typename Cipher, typename Padding>
                    struct ecb_encryption_policy<Cipher, Padding, cts<3, Cipher, Padding>>
                        : public ecb_policy<Cipher, Padding> {
                        typedef typename ecb_policy<Cipher, Padding>::size_type size_type;
 
                        typedef typename ecb_policy<Cipher, Padding>::cipher_type cipher_type;
                        typedef typename ecb_policy<Cipher, Padding>::padding_type padding_type;
 
                        constexpr static const size_type block_bits = ecb_policy<Cipher, Padding>::block_bits;
                        constexpr static const size_type block_words = ecb_policy<Cipher, Padding>::block_words;
                        typedef typename ecb_policy<Cipher, Padding>::block_type block_type;
 
                        block_type begin_message(const cipher_type &cipher, const block_type &plaintext) {
                            return cipher.encrypt(plaintext);
                        }
 
                        block_type process_block(const cipher_type &cipher, const block_type &plaintext) {
                            return cipher.encrypt(plaintext);
                        }
 
                        block_type end_message(const cipher_type &cipher, const block_type &plaintext) {
                            const size_type rem = len % block_size;
                            if (rem || padding_type::always_pad) {
                                unsigned char block[block_size];
                                std::memcpy(block, in, rem);
                                padding_type::pad(block, block_size, rem);
                                c_.encrypt_block(block, <#initializer #>);
                            }
                        }
                    };
 
                    template<typename Cipher, typename Padding, typename CiphertextStealingMode>
                    struct ecb_decryption_policy : public ecb_policy<Cipher, Padding> {};
 
                    template<typename Cipher, typename Padding>
                    struct ecb_decryption_policy<Cipher, Padding, cts<0, Cipher, Padding>>
                        : public ecb_policy<Cipher, Padding> {
                        typedef typename ecb_policy<Cipher, Padding>::size_type size_type;
 
                        typedef typename ecb_policy<Cipher, Padding>::cipher_type cipher_type;
                        typedef typename ecb_policy<Cipher, Padding>::padding_type padding_type;
 
                        constexpr static const size_type block_bits = ecb_policy<Cipher, Padding>::block_bits;
                        constexpr static const size_type block_words = ecb_policy<Cipher, Padding>::block_words;
                        typedef typename ecb_policy<Cipher, Padding>::block_type block_type;
 
                        block_type begin_message(const cipher_type &cipher, const block_type &plaintext) {
                            return cipher.decrypt(plaintext);
                        }
 
                        block_type process_block(const cipher_type &cipher, const block_type &plaintext) {
                            return cipher.decrypt(plaintext);
                        }
 
                        block_type end_message(const cipher_type &cipher, const block_type &plaintext) {
                            const size_type rem = len % block_size;
                            if (rem || padding_type::always_pad) {
                                return cipher.decrypt_block(plaintext, <#initializer #>);
                            }
                        }
                    };
 
                    template<typename Cipher, typename Padding>
                    struct ecb_decryption_policy<Cipher, Padding, cts<1, Cipher, Padding>>
                        : public ecb_policy<Cipher, Padding> {
                        typedef typename ecb_policy<Cipher, Padding>::size_type size_type;
 
                        typedef typename ecb_policy<Cipher, Padding>::cipher_type cipher_type;
                        typedef typename ecb_policy<Cipher, Padding>::padding_type padding_type;
 
                        constexpr static const size_type block_bits = ecb_policy<Cipher, Padding>::block_bits;
                        constexpr static const size_type block_words = ecb_policy<Cipher, Padding>::block_words;
                        typedef typename ecb_policy<Cipher, Padding>::block_type block_type;
 
                        block_type begin_message(const cipher_type &cipher, const block_type &plaintext) {
                            return cipher.decrypt(plaintext);
                        }
 
                        block_type process_block(const cipher_type &cipher, const block_type &plaintext) {
                            return cipher.decrypt(plaintext);
                        }
 
                        block_type end_message(const cipher_type &cipher, const block_type &plaintext) {
                            const size_type rem = len % block_size;
                            if (rem || padding_type::always_pad) {
                                return cipher.decrypt_block(plaintext, <#initializer #>);
                            }
                        }
                    };
 
                    template<typename Cipher, typename Padding>
                    struct ecb_decryption_policy<Cipher, Padding, cts<2, Cipher, Padding>>
                        : public ecb_policy<Cipher, Padding> {
                        typedef typename ecb_policy<Cipher, Padding>::size_type size_type;
 
                        typedef typename ecb_policy<Cipher, Padding>::cipher_type cipher_type;
                        typedef typename ecb_policy<Cipher, Padding>::padding_type padding_type;
 
                        constexpr static const size_type block_bits = ecb_policy<Cipher, Padding>::block_bits;
                        constexpr static const size_type block_words = ecb_policy<Cipher, Padding>::block_words;
                        typedef typename ecb_policy<Cipher, Padding>::block_type block_type;
 
                        block_type begin_message(const cipher_type &cipher, const block_type &plaintext) {
                            return cipher.decrypt(plaintext);
                        }
 
                        block_type process_block(const cipher_type &cipher, const block_type &plaintext) {
                            return cipher.decrypt(plaintext);
                        }
 
                        block_type end_message(const cipher_type &cipher, const block_type &plaintext) {
                            const size_type rem = len % block_size;
                            if (rem || padding_type::always_pad) {
                                return cipher.decrypt_block(plaintext, <#initializer #>);
                            }
                        }
                    };
 
                    template<typename Cipher, typename Padding>
                    struct ecb_decryption_policy<Cipher, Padding, cts<3, Cipher, Padding>>
                        : public ecb_policy<Cipher, Padding> {
                        typedef typename ecb_policy<Cipher, Padding>::size_type size_type;
 
                        typedef typename ecb_policy<Cipher, Padding>::cipher_type cipher_type;
                        typedef typename ecb_policy<Cipher, Padding>::padding_type padding_type;
 
                        constexpr static const size_type block_bits = ecb_policy<Cipher, Padding>::block_bits;
                        constexpr static const size_type block_words = ecb_policy<Cipher, Padding>::block_words;
                        typedef typename ecb_policy<Cipher, Padding>::block_type block_type;
 
                        block_type begin_message(const cipher_type &cipher, const block_type &plaintext) {
                            return cipher.decrypt(plaintext);
                        }
 
                        block_type process_block(const cipher_type &cipher, const block_type &plaintext) {
                            return cipher.decrypt(plaintext);
                        }
 
                        block_type end_message(const cipher_type &cipher, const block_type &plaintext) {
                            const size_type rem = len % block_size;
                            if (rem || padding_type::always_pad) {
                                return cipher.decrypt_block(plaintext, <#initializer #>);
                            }
                        }
                    };
 
                    // Electronic Code Book CodecMode (ECB)
                    template<typename Policy>
                    class electronic_code_book {
                        typedef Policy policy_type;
 
                    public:
                        typedef typename policy_type::cipher_type cipher_type;
                        typedef typename policy_type::padding_type padding_type;
 
                        typedef typename policy_type::size_type size_type;
 
                        constexpr static const std::size_t block_bits = policy_type::block_bits;
                        constexpr static const std::size_t block_words = policy_type::block_words;
                        typedef typename cipher_type::block_type block_type;
 
                        electronic_code_book(const cipher_type &c) : cipher(c) {
                        }
 
                        block_type begin_message(const block_type &plaintext) {
                            return policy_type::begin_message(cipher, plaintext);
                        }
 
                        block_type process_block(const block_type &plaintext) {
                            return policy_type::process_block(cipher, plaintext);
                        }
 
                        block_type end_message(const block_type &plaintext) {
                            return policy_type::end_message(cipher, plaintext);
                        }
 
                        size_type required_output_size(size_type inputlen) const {
                            return padding_type::required_output_size(inputlen, block_size);
                        }
 
                        constexpr static const unsigned int key_length = cipher_type::key_length / 8;
                        constexpr static const unsigned int block_size = cipher_type::block_size / 8;
 
                    private:
                        cipher_type cipher;
                    };
                }    // namespace detail
 
                template<typename Cipher, template<typename> class Padding,
                         template<typename, typename> class CiphertextStealingMode = cts0>
                struct electronic_code_book {
                    typedef Cipher cipher_type;
                    typedef Padding<Cipher> padding_type;
                    typedef CiphertextStealingMode<Cipher, Padding<Cipher>> ciphertext_stealing_type;
 
                    typedef detail::ecb_encryption_policy<cipher_type, padding_type, ciphertext_stealing_type>
                        encryption_policy;
                    typedef detail::ecb_decryption_policy<cipher_type, padding_type, ciphertext_stealing_type>
                        decryption_policy;
 
                    template<template<typename, typename> class Policy>
                    struct bind {
                        typedef detail::electronic_code_book<Policy<cipher_type, padding_type>> type;
                    };
                };
 
                template<typename Cipher, template<typename> class Padding>
                using ecb = electronic_code_book<Cipher, Padding>;
            }    // namespace modes
        }        // namespace block
    }            // namespace crypto3
}    // namespace nil
 
#endif    // CRYPTO3_ECB_HPP