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Yen Lin5b1a5452012-04-05 11:54:58 +00001/*
2 * Copyright (c) 2011 The Chromium OS Authors.
3 * (C) Copyright 2010 - 2011 NVIDIA Corporation <www.nvidia.com>
4 *
Wolfgang Denk1a459662013-07-08 09:37:19 +02005 * SPDX-License-Identifier: GPL-2.0+
Yen Lin5b1a5452012-04-05 11:54:58 +00006 */
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
18enum {
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 */
34void 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 */
43void 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 */
52void aes_decrypt(u8 *in, u8 *expkey, u8 *out);
53
54#endif /* _AES_REF_H_ */