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1 | /* | |
2 | * Copyright 2003-2004, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * | |
5 | * Rewrite: Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org> | |
6 | * | |
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 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/types.h> | |
14 | #include <linux/err.h> | |
15 | #include <crypto/aead.h> | |
16 | ||
17 | #include <net/mac80211.h> | |
18 | #include "key.h" | |
19 | #include "aes_ccm.h" | |
20 | ||
21 | void ieee80211_aes_ccm_encrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad, | |
22 | u8 *data, size_t data_len, u8 *mic, | |
23 | size_t mic_len) | |
24 | { | |
25 | struct scatterlist sg[3]; | |
26 | ||
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)); | |
33 | ||
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); | |
38 | ||
39 | aead_request_set_tfm(aead_req, tfm); | |
40 | aead_request_set_crypt(aead_req, sg, sg, data_len, b_0); | |
41 | aead_request_set_ad(aead_req, sg[0].length); | |
42 | ||
43 | crypto_aead_encrypt(aead_req); | |
44 | } | |
45 | ||
46 | int ieee80211_aes_ccm_decrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad, | |
47 | u8 *data, size_t data_len, u8 *mic, | |
48 | size_t mic_len) | |
49 | { | |
50 | struct scatterlist sg[3]; | |
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; | |
55 | ||
56 | if (data_len == 0) | |
57 | return -EINVAL; | |
58 | ||
59 | memset(aead_req, 0, sizeof(aead_req_data)); | |
60 | ||
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); | |
65 | ||
66 | aead_request_set_tfm(aead_req, tfm); | |
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); | |
69 | ||
70 | return crypto_aead_decrypt(aead_req); | |
71 | } | |
72 | ||
73 | struct crypto_aead *ieee80211_aes_key_setup_encrypt(const u8 key[], | |
74 | size_t key_len, | |
75 | size_t mic_len) | |
76 | { | |
77 | struct crypto_aead *tfm; | |
78 | int err; | |
79 | ||
80 | tfm = crypto_alloc_aead("ccm(aes)", 0, CRYPTO_ALG_ASYNC); | |
81 | if (IS_ERR(tfm)) | |
82 | return tfm; | |
83 | ||
84 | err = crypto_aead_setkey(tfm, key, key_len); | |
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; | |
92 | ||
93 | free_aead: | |
94 | crypto_free_aead(tfm); | |
95 | return ERR_PTR(err); | |
96 | } | |
97 | ||
98 | void ieee80211_aes_key_free(struct crypto_aead *tfm) | |
99 | { | |
100 | crypto_free_aead(tfm); | |
101 | } |