1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * Copyright (c) 2011 The Chromium OS Authors.
4 * (C) Copyright 2010 - 2011 NVIDIA Corporation <www.nvidia.com>
11 /* Define compat stuff for use in fw_* tools. */
12 typedef unsigned char u8;
13 typedef unsigned int u32;
14 #define debug(...) do {} while (0)
18 * AES encryption library, with small code size, supporting only 128-bit AES
20 * AES is a stream cipher which works a block at a time, with each block
21 * in this case being AES_KEY_LENGTH bytes.
25 AES_STATECOLS = 4, /* columns in the state & expanded key */
26 AES_KEYCOLS = 4, /* columns in a key */
27 AES_ROUNDS = 10, /* rounds in encryption */
29 AES_KEY_LENGTH = 128 / 8,
30 AES_EXPAND_KEY_LENGTH = 4 * AES_STATECOLS * (AES_ROUNDS + 1),
34 * aes_expand_key() - Expand the AES key
36 * Expand a key into a key schedule, which is then used for the other
39 * @key Key, of length AES_KEY_LENGTH bytes
40 * @expkey Buffer to place expanded key, AES_EXPAND_KEY_LENGTH
42 void aes_expand_key(u8 *key, u8 *expkey);
45 * aes_encrypt() - Encrypt single block of data with AES 128
48 * @expkey Expanded key to use for encryption (from aes_expand_key())
51 void aes_encrypt(u8 *in, u8 *expkey, u8 *out);
54 * aes_decrypt() - Decrypt single block of data with AES 128
57 * @expkey Expanded key to use for decryption (from aes_expand_key())
60 void aes_decrypt(u8 *in, u8 *expkey, u8 *out);
63 * Apply chain data to the destination using EOR
65 * Each array is of length AES_KEY_LENGTH.
67 * @cbc_chain_data Chain data
69 * @dst Destination data, which is modified here
71 void aes_apply_cbc_chain_data(u8 *cbc_chain_data, u8 *src, u8 *dst);
74 * aes_cbc_encrypt_blocks() - Encrypt multiple blocks of data with AES CBC.
76 * @key_exp Expanded key to use
77 * @iv Initialization vector
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 *iv, u8 *src, u8 *dst,
86 * Decrypt multiple blocks of data with AES CBC.
88 * @key_exp Expanded key to use
89 * @iv Initialization vector
90 * @src Source data to decrypt
91 * @dst Destination buffer
92 * @num_aes_blocks Number of AES blocks to decrypt
94 void aes_cbc_decrypt_blocks(u8 *key_exp, u8 *iv, u8 *src, u8 *dst,
97 #endif /* _AES_REF_H_ */