Commit | Line | Data |
---|---|---|
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 | 13 | #include <linux/types.h> |
f0706e82 | 14 | #include <linux/err.h> |
d8fe0ddd | 15 | #include <crypto/aead.h> |
f0706e82 JB |
16 | |
17 | #include <net/mac80211.h> | |
2c8dccc7 | 18 | #include "key.h" |
f0706e82 JB |
19 | #include "aes_ccm.h" |
20 | ||
7ec7c4a9 | 21 | void ieee80211_aes_ccm_encrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad, |
2b2ba0db JM |
22 | u8 *data, size_t data_len, u8 *mic, |
23 | size_t mic_len) | |
f0706e82 | 24 | { |
957e0fe6 | 25 | struct scatterlist sg[3]; |
f0706e82 | 26 | |
6e1ee5d2 JSM |
27 | char aead_req_data[sizeof(struct aead_request) + |
28 | crypto_aead_reqsize(tfm)] | |
29 | __aligned(__alignof__(struct aead_request)); | |
30 | struct aead_request *aead_req = (void *) aead_req_data; | |
31 | ||
32 | memset(aead_req, 0, sizeof(aead_req_data)); | |
f0706e82 | 33 | |
957e0fe6 HX |
34 | sg_init_table(sg, 3); |
35 | sg_set_buf(&sg[0], &aad[2], be16_to_cpup((__be16 *)aad)); | |
36 | sg_set_buf(&sg[1], data, data_len); | |
37 | sg_set_buf(&sg[2], mic, mic_len); | |
f0706e82 | 38 | |
6e1ee5d2 | 39 | aead_request_set_tfm(aead_req, tfm); |
957e0fe6 HX |
40 | aead_request_set_crypt(aead_req, sg, sg, data_len, b_0); |
41 | aead_request_set_ad(aead_req, sg[0].length); | |
f0706e82 | 42 | |
6e1ee5d2 | 43 | crypto_aead_encrypt(aead_req); |
f0706e82 JB |
44 | } |
45 | ||
7ec7c4a9 | 46 | int ieee80211_aes_ccm_decrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad, |
2b2ba0db JM |
47 | u8 *data, size_t data_len, u8 *mic, |
48 | size_t mic_len) | |
f0706e82 | 49 | { |
957e0fe6 | 50 | struct scatterlist sg[3]; |
6e1ee5d2 JSM |
51 | char aead_req_data[sizeof(struct aead_request) + |
52 | crypto_aead_reqsize(tfm)] | |
53 | __aligned(__alignof__(struct aead_request)); | |
54 | struct aead_request *aead_req = (void *) aead_req_data; | |
7ec7c4a9 | 55 | |
4f031fa9 RW |
56 | if (data_len == 0) |
57 | return -EINVAL; | |
58 | ||
6e1ee5d2 | 59 | memset(aead_req, 0, sizeof(aead_req_data)); |
7ec7c4a9 | 60 | |
957e0fe6 HX |
61 | sg_init_table(sg, 3); |
62 | sg_set_buf(&sg[0], &aad[2], be16_to_cpup((__be16 *)aad)); | |
63 | sg_set_buf(&sg[1], data, data_len); | |
64 | sg_set_buf(&sg[2], mic, mic_len); | |
7ec7c4a9 | 65 | |
6e1ee5d2 | 66 | aead_request_set_tfm(aead_req, tfm); |
957e0fe6 HX |
67 | aead_request_set_crypt(aead_req, sg, sg, data_len + mic_len, b_0); |
68 | aead_request_set_ad(aead_req, sg[0].length); | |
7ec7c4a9 | 69 | |
6e1ee5d2 | 70 | return crypto_aead_decrypt(aead_req); |
f0706e82 JB |
71 | } |
72 | ||
2b2ba0db JM |
73 | struct crypto_aead *ieee80211_aes_key_setup_encrypt(const u8 key[], |
74 | size_t key_len, | |
75 | size_t mic_len) | |
f0706e82 | 76 | { |
7ec7c4a9 AB |
77 | struct crypto_aead *tfm; |
78 | int err; | |
f0706e82 | 79 | |
7ec7c4a9 AB |
80 | tfm = crypto_alloc_aead("ccm(aes)", 0, CRYPTO_ALG_ASYNC); |
81 | if (IS_ERR(tfm)) | |
82 | return tfm; | |
f0706e82 | 83 | |
2b2ba0db | 84 | err = crypto_aead_setkey(tfm, key, key_len); |
45fd6329 DC |
85 | if (err) |
86 | goto free_aead; | |
87 | err = crypto_aead_setauthsize(tfm, mic_len); | |
88 | if (err) | |
89 | goto free_aead; | |
90 | ||
91 | return tfm; | |
f0706e82 | 92 | |
45fd6329 | 93 | free_aead: |
7ec7c4a9 AB |
94 | crypto_free_aead(tfm); |
95 | return ERR_PTR(err); | |
f0706e82 JB |
96 | } |
97 | ||
7ec7c4a9 | 98 | void ieee80211_aes_key_free(struct crypto_aead *tfm) |
f0706e82 | 99 | { |
7ec7c4a9 | 100 | crypto_free_aead(tfm); |
f0706e82 | 101 | } |