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5b1a5451 YL |
1 | /* |
2 | * Copyright (c) 2011 The Chromium OS Authors. | |
3 | * (C) Copyright 2010 - 2011 NVIDIA Corporation <www.nvidia.com> | |
4 | * | |
1a459660 | 5 | * SPDX-License-Identifier: GPL-2.0+ |
5b1a5451 YL |
6 | */ |
7 | ||
8 | #ifndef _AES_REF_H_ | |
9 | #define _AES_REF_H_ | |
10 | ||
11 | /* | |
12 | * AES encryption library, with small code size, supporting only 128-bit AES | |
13 | * | |
14 | * AES is a stream cipher which works a block at a time, with each block | |
15 | * in this case being AES_KEY_LENGTH bytes. | |
16 | */ | |
17 | ||
18 | enum { | |
19 | AES_STATECOLS = 4, /* columns in the state & expanded key */ | |
20 | AES_KEYCOLS = 4, /* columns in a key */ | |
21 | AES_ROUNDS = 10, /* rounds in encryption */ | |
22 | ||
23 | AES_KEY_LENGTH = 128 / 8, | |
24 | AES_EXPAND_KEY_LENGTH = 4 * AES_STATECOLS * (AES_ROUNDS + 1), | |
25 | }; | |
26 | ||
27 | /** | |
28 | * Expand a key into a key schedule, which is then used for the other | |
29 | * operations. | |
30 | * | |
31 | * \param key Key, of length AES_KEY_LENGTH bytes | |
32 | * \param expkey Buffer to place expanded key, AES_EXPAND_KEY_LENGTH | |
33 | */ | |
34 | void aes_expand_key(u8 *key, u8 *expkey); | |
35 | ||
36 | /** | |
37 | * Encrypt a single block of data | |
38 | * | |
39 | * in Input data | |
40 | * expkey Expanded key to use for encryption (from aes_expand_key()) | |
41 | * out Output data | |
42 | */ | |
43 | void aes_encrypt(u8 *in, u8 *expkey, u8 *out); | |
44 | ||
45 | /** | |
46 | * Decrypt a single block of data | |
47 | * | |
48 | * in Input data | |
49 | * expkey Expanded key to use for decryption (from aes_expand_key()) | |
50 | * out Output data | |
51 | */ | |
52 | void aes_decrypt(u8 *in, u8 *expkey, u8 *out); | |
53 | ||
54 | #endif /* _AES_REF_H_ */ |