]>
git.ipfire.org Git - people/ms/u-boot.git/blob - include/aes.h
2 * Copyright (c) 2011 The Chromium OS Authors.
3 * (C) Copyright 2010 - 2011 NVIDIA Corporation <www.nvidia.com>
5 * SPDX-License-Identifier: GPL-2.0+
12 /* Define compat stuff for use in fw_* tools. */
13 typedef unsigned char u8
;
14 typedef unsigned int u32
;
15 #define debug(...) do {} while (0)
19 * AES encryption library, with small code size, supporting only 128-bit AES
21 * AES is a stream cipher which works a block at a time, with each block
22 * in this case being AES_KEY_LENGTH bytes.
26 AES_STATECOLS
= 4, /* columns in the state & expanded key */
27 AES_KEYCOLS
= 4, /* columns in a key */
28 AES_ROUNDS
= 10, /* rounds in encryption */
30 AES_KEY_LENGTH
= 128 / 8,
31 AES_EXPAND_KEY_LENGTH
= 4 * AES_STATECOLS
* (AES_ROUNDS
+ 1),
35 * aes_expand_key() - Expand the AES key
37 * Expand a key into a key schedule, which is then used for the other
40 * @key Key, of length AES_KEY_LENGTH bytes
41 * @expkey Buffer to place expanded key, AES_EXPAND_KEY_LENGTH
43 void aes_expand_key(u8
*key
, u8
*expkey
);
46 * aes_encrypt() - Encrypt single block of data with AES 128
49 * @expkey Expanded key to use for encryption (from aes_expand_key())
52 void aes_encrypt(u8
*in
, u8
*expkey
, u8
*out
);
55 * aes_decrypt() - Decrypt single block of data with AES 128
58 * @expkey Expanded key to use for decryption (from aes_expand_key())
61 void aes_decrypt(u8
*in
, u8
*expkey
, u8
*out
);
64 * Apply chain data to the destination using EOR
66 * Each array is of length AES_KEY_LENGTH.
68 * @cbc_chain_data Chain data
70 * @dst Destination data, which is modified here
72 void aes_apply_cbc_chain_data(u8
*cbc_chain_data
, u8
*src
, u8
*dst
);
75 * aes_cbc_encrypt_blocks() - Encrypt multiple blocks of data with AES CBC.
77 * @key_exp Expanded key to use
78 * @src Source data to encrypt
79 * @dst Destination buffer
80 * @num_aes_blocks Number of AES blocks to encrypt
82 void aes_cbc_encrypt_blocks(u8
*key_exp
, u8
*src
, u8
*dst
, u32 num_aes_blocks
);
85 * Decrypt multiple blocks of data with AES CBC.
87 * @key_exp Expanded key to use
88 * @src Source data to decrypt
89 * @dst Destination buffer
90 * @num_aes_blocks Number of AES blocks to decrypt
92 void aes_cbc_decrypt_blocks(u8
*key_exp
, u8
*src
, u8
*dst
, u32 num_aes_blocks
);
94 #endif /* _AES_REF_H_ */