89 lines
3.4 KiB
C++
89 lines
3.4 KiB
C++
/*
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* aes256.hpp
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*
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* Copyright (c) 2014, Danilo Treffiletti <urban82@gmail.com>
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* All rights reserved.
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*
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* This file is part of Aes256.
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*
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* Aes256 is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation, either version 2.1
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* of the License, or (at your option) any later version.
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*
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* Aes256 is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Aes256.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef AES256_HPP
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#define AES256_HPP
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#include <vector>
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typedef std::vector<unsigned char> ByteArray;
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#define BLOCK_SIZE 16
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class Aes256 {
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public:
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Aes256(const ByteArray& key);
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~Aes256();
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static ByteArray::size_type encrypt(const ByteArray& key, const ByteArray& plain, ByteArray& encrypted);
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static ByteArray::size_type encrypt(const ByteArray& key, const unsigned char* plain, const ByteArray::size_type plain_length, ByteArray& encrypted);
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static ByteArray::size_type decrypt(const ByteArray& key, const ByteArray& encrypted, ByteArray& plain);
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static ByteArray::size_type decrypt(const ByteArray& key, const unsigned char* encrypted, const ByteArray::size_type encrypted_length, ByteArray& plain);
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ByteArray::size_type encrypt_start(const ByteArray::size_type plain_length, ByteArray& encrypted);
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ByteArray::size_type encrypt_continue(const ByteArray& plain, ByteArray& encrypted);
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ByteArray::size_type encrypt_continue(const unsigned char* plain, const ByteArray::size_type plain_length, ByteArray& encrypted);
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ByteArray::size_type encrypt_end(ByteArray& encrypted);
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ByteArray::size_type decrypt_start(const ByteArray::size_type encrypted_length);
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ByteArray::size_type decrypt_continue(const ByteArray& encrypted, ByteArray& plain);
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ByteArray::size_type decrypt_continue(const unsigned char* encrypted, const ByteArray::size_type encrypted_length, ByteArray& plain);
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ByteArray::size_type decrypt_end(ByteArray& plain);
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private:
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ByteArray m_key;
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ByteArray m_salt;
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ByteArray m_rkey;
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unsigned char m_buffer[3 * BLOCK_SIZE];
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unsigned char m_buffer_pos;
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ByteArray::size_type m_remainingLength;
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bool m_decryptInitialized;
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void check_and_encrypt_buffer(ByteArray& encrypted);
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void check_and_decrypt_buffer(ByteArray& plain);
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void encrypt(unsigned char *buffer);
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void decrypt(unsigned char *buffer);
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void expand_enc_key(unsigned char *rc);
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void expand_dec_key(unsigned char *rc);
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void sub_bytes(unsigned char *buffer);
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void sub_bytes_inv(unsigned char *buffer);
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void copy_key();
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void add_round_key(unsigned char *buffer, const unsigned char round);
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void shift_rows(unsigned char *buffer);
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void shift_rows_inv(unsigned char *buffer);
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void mix_columns(unsigned char *buffer);
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void mix_columns_inv(unsigned char *buffer);
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};
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#endif /* AES256_HPP */
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