/src/hostap/src/crypto/aes-cbc.c
Line | Count | Source (jump to first uncovered line) |
1 | | /* |
2 | | * AES-128 CBC |
3 | | * |
4 | | * Copyright (c) 2003-2007, Jouni Malinen <j@w1.fi> |
5 | | * |
6 | | * This software may be distributed under the terms of the BSD license. |
7 | | * See README for more details. |
8 | | */ |
9 | | |
10 | | #include "includes.h" |
11 | | |
12 | | #include "common.h" |
13 | | #include "aes.h" |
14 | | #include "aes_wrap.h" |
15 | | |
16 | | /** |
17 | | * aes_128_cbc_encrypt - AES-128 CBC encryption |
18 | | * @key: Encryption key |
19 | | * @iv: Encryption IV for CBC mode (16 bytes) |
20 | | * @data: Data to encrypt in-place |
21 | | * @data_len: Length of data in bytes (must be divisible by 16) |
22 | | * Returns: 0 on success, -1 on failure |
23 | | */ |
24 | | int aes_128_cbc_encrypt(const u8 *key, const u8 *iv, u8 *data, size_t data_len) |
25 | 0 | { |
26 | 0 | void *ctx; |
27 | 0 | u8 cbc[AES_BLOCK_SIZE]; |
28 | 0 | u8 *pos = data; |
29 | 0 | int i, j, blocks; |
30 | |
|
31 | 0 | if (TEST_FAIL()) |
32 | 0 | return -1; |
33 | | |
34 | 0 | ctx = aes_encrypt_init(key, 16); |
35 | 0 | if (ctx == NULL) |
36 | 0 | return -1; |
37 | 0 | os_memcpy(cbc, iv, AES_BLOCK_SIZE); |
38 | |
|
39 | 0 | blocks = data_len / AES_BLOCK_SIZE; |
40 | 0 | for (i = 0; i < blocks; i++) { |
41 | 0 | for (j = 0; j < AES_BLOCK_SIZE; j++) |
42 | 0 | cbc[j] ^= pos[j]; |
43 | 0 | aes_encrypt(ctx, cbc, cbc); |
44 | 0 | os_memcpy(pos, cbc, AES_BLOCK_SIZE); |
45 | 0 | pos += AES_BLOCK_SIZE; |
46 | 0 | } |
47 | 0 | aes_encrypt_deinit(ctx); |
48 | 0 | return 0; |
49 | 0 | } |
50 | | |
51 | | |
52 | | /** |
53 | | * aes_128_cbc_decrypt - AES-128 CBC decryption |
54 | | * @key: Decryption key |
55 | | * @iv: Decryption IV for CBC mode (16 bytes) |
56 | | * @data: Data to decrypt in-place |
57 | | * @data_len: Length of data in bytes (must be divisible by 16) |
58 | | * Returns: 0 on success, -1 on failure |
59 | | */ |
60 | | int aes_128_cbc_decrypt(const u8 *key, const u8 *iv, u8 *data, size_t data_len) |
61 | 0 | { |
62 | 0 | void *ctx; |
63 | 0 | u8 cbc[AES_BLOCK_SIZE], tmp[AES_BLOCK_SIZE]; |
64 | 0 | u8 *pos = data; |
65 | 0 | int i, j, blocks; |
66 | |
|
67 | 0 | if (TEST_FAIL()) |
68 | 0 | return -1; |
69 | | |
70 | 0 | ctx = aes_decrypt_init(key, 16); |
71 | 0 | if (ctx == NULL) |
72 | 0 | return -1; |
73 | 0 | os_memcpy(cbc, iv, AES_BLOCK_SIZE); |
74 | |
|
75 | 0 | blocks = data_len / AES_BLOCK_SIZE; |
76 | 0 | for (i = 0; i < blocks; i++) { |
77 | 0 | os_memcpy(tmp, pos, AES_BLOCK_SIZE); |
78 | 0 | aes_decrypt(ctx, pos, pos); |
79 | 0 | for (j = 0; j < AES_BLOCK_SIZE; j++) |
80 | 0 | pos[j] ^= cbc[j]; |
81 | 0 | os_memcpy(cbc, tmp, AES_BLOCK_SIZE); |
82 | 0 | pos += AES_BLOCK_SIZE; |
83 | 0 | } |
84 | 0 | aes_decrypt_deinit(ctx); |
85 | 0 | return 0; |
86 | 0 | } |