1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
/*
* 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 */
|