Commit | Line | Data |
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f0706e82 JB |
1 | /* |
2 | * Copyright 2003-2004, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * | |
7ec7c4a9 AB |
5 | * Rewrite: Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org> |
6 | * | |
f0706e82 JB |
7 | * This program is free software; you can redistribute it and/or modify |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
172589cc | 12 | #include <linux/kernel.h> |
f0706e82 JB |
13 | #include <linux/types.h> |
14 | #include <linux/crypto.h> | |
15 | #include <linux/err.h> | |
0cd20a27 | 16 | #include <crypto/aes.h> |
f0706e82 JB |
17 | |
18 | #include <net/mac80211.h> | |
2c8dccc7 | 19 | #include "key.h" |
f0706e82 JB |
20 | #include "aes_ccm.h" |
21 | ||
7ec7c4a9 | 22 | void ieee80211_aes_ccm_encrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad, |
2b2ba0db JM |
23 | u8 *data, size_t data_len, u8 *mic, |
24 | size_t mic_len) | |
f0706e82 | 25 | { |
7ec7c4a9 | 26 | struct scatterlist assoc, pt, ct[2]; |
f0706e82 | 27 | |
6e1ee5d2 JSM |
28 | char aead_req_data[sizeof(struct aead_request) + |
29 | crypto_aead_reqsize(tfm)] | |
30 | __aligned(__alignof__(struct aead_request)); | |
31 | struct aead_request *aead_req = (void *) aead_req_data; | |
32 | ||
33 | memset(aead_req, 0, sizeof(aead_req_data)); | |
f0706e82 | 34 | |
7ec7c4a9 AB |
35 | sg_init_one(&pt, data, data_len); |
36 | sg_init_one(&assoc, &aad[2], be16_to_cpup((__be16 *)aad)); | |
37 | sg_init_table(ct, 2); | |
38 | sg_set_buf(&ct[0], data, data_len); | |
2b2ba0db | 39 | sg_set_buf(&ct[1], mic, mic_len); |
f0706e82 | 40 | |
6e1ee5d2 JSM |
41 | aead_request_set_tfm(aead_req, tfm); |
42 | aead_request_set_assoc(aead_req, &assoc, assoc.length); | |
43 | aead_request_set_crypt(aead_req, &pt, ct, data_len, b_0); | |
f0706e82 | 44 | |
6e1ee5d2 | 45 | crypto_aead_encrypt(aead_req); |
f0706e82 JB |
46 | } |
47 | ||
7ec7c4a9 | 48 | int ieee80211_aes_ccm_decrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad, |
2b2ba0db JM |
49 | u8 *data, size_t data_len, u8 *mic, |
50 | size_t mic_len) | |
f0706e82 | 51 | { |
7ec7c4a9 | 52 | struct scatterlist assoc, pt, ct[2]; |
6e1ee5d2 JSM |
53 | char aead_req_data[sizeof(struct aead_request) + |
54 | crypto_aead_reqsize(tfm)] | |
55 | __aligned(__alignof__(struct aead_request)); | |
56 | struct aead_request *aead_req = (void *) aead_req_data; | |
7ec7c4a9 | 57 | |
4f031fa9 RW |
58 | if (data_len == 0) |
59 | return -EINVAL; | |
60 | ||
6e1ee5d2 | 61 | memset(aead_req, 0, sizeof(aead_req_data)); |
7ec7c4a9 AB |
62 | |
63 | sg_init_one(&pt, data, data_len); | |
64 | sg_init_one(&assoc, &aad[2], be16_to_cpup((__be16 *)aad)); | |
65 | sg_init_table(ct, 2); | |
66 | sg_set_buf(&ct[0], data, data_len); | |
2b2ba0db | 67 | sg_set_buf(&ct[1], mic, mic_len); |
7ec7c4a9 | 68 | |
6e1ee5d2 JSM |
69 | aead_request_set_tfm(aead_req, tfm); |
70 | aead_request_set_assoc(aead_req, &assoc, assoc.length); | |
2b2ba0db | 71 | aead_request_set_crypt(aead_req, ct, &pt, data_len + mic_len, b_0); |
7ec7c4a9 | 72 | |
6e1ee5d2 | 73 | return crypto_aead_decrypt(aead_req); |
f0706e82 JB |
74 | } |
75 | ||
2b2ba0db JM |
76 | struct crypto_aead *ieee80211_aes_key_setup_encrypt(const u8 key[], |
77 | size_t key_len, | |
78 | size_t mic_len) | |
f0706e82 | 79 | { |
7ec7c4a9 AB |
80 | struct crypto_aead *tfm; |
81 | int err; | |
f0706e82 | 82 | |
7ec7c4a9 AB |
83 | tfm = crypto_alloc_aead("ccm(aes)", 0, CRYPTO_ALG_ASYNC); |
84 | if (IS_ERR(tfm)) | |
85 | return tfm; | |
f0706e82 | 86 | |
2b2ba0db | 87 | err = crypto_aead_setkey(tfm, key, key_len); |
45fd6329 DC |
88 | if (err) |
89 | goto free_aead; | |
90 | err = crypto_aead_setauthsize(tfm, mic_len); | |
91 | if (err) | |
92 | goto free_aead; | |
93 | ||
94 | return tfm; | |
f0706e82 | 95 | |
45fd6329 | 96 | free_aead: |
7ec7c4a9 AB |
97 | crypto_free_aead(tfm); |
98 | return ERR_PTR(err); | |
f0706e82 JB |
99 | } |
100 | ||
7ec7c4a9 | 101 | void ieee80211_aes_key_free(struct crypto_aead *tfm) |
f0706e82 | 102 | { |
7ec7c4a9 | 103 | crypto_free_aead(tfm); |
f0706e82 | 104 | } |