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