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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 AB |
22 | void ieee80211_aes_ccm_encrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad, |
23 | u8 *data, size_t data_len, u8 *mic) | |
f0706e82 | 24 | { |
7ec7c4a9 AB |
25 | struct scatterlist assoc, pt, ct[2]; |
26 | struct { | |
27 | struct aead_request req; | |
28 | u8 priv[crypto_aead_reqsize(tfm)]; | |
29 | } aead_req; | |
f0706e82 | 30 | |
7ec7c4a9 | 31 | memset(&aead_req, 0, sizeof(aead_req)); |
f0706e82 | 32 | |
7ec7c4a9 AB |
33 | sg_init_one(&pt, data, data_len); |
34 | sg_init_one(&assoc, &aad[2], be16_to_cpup((__be16 *)aad)); | |
35 | sg_init_table(ct, 2); | |
36 | sg_set_buf(&ct[0], data, data_len); | |
37 | sg_set_buf(&ct[1], mic, IEEE80211_CCMP_MIC_LEN); | |
f0706e82 | 38 | |
7ec7c4a9 AB |
39 | aead_request_set_tfm(&aead_req.req, tfm); |
40 | aead_request_set_assoc(&aead_req.req, &assoc, assoc.length); | |
41 | aead_request_set_crypt(&aead_req.req, &pt, ct, data_len, b_0); | |
f0706e82 | 42 | |
7ec7c4a9 | 43 | crypto_aead_encrypt(&aead_req.req); |
f0706e82 JB |
44 | } |
45 | ||
7ec7c4a9 AB |
46 | int ieee80211_aes_ccm_decrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad, |
47 | u8 *data, size_t data_len, u8 *mic) | |
f0706e82 | 48 | { |
7ec7c4a9 AB |
49 | struct scatterlist assoc, pt, ct[2]; |
50 | struct { | |
51 | struct aead_request req; | |
52 | u8 priv[crypto_aead_reqsize(tfm)]; | |
53 | } aead_req; | |
54 | ||
55 | memset(&aead_req, 0, sizeof(aead_req)); | |
56 | ||
57 | sg_init_one(&pt, data, data_len); | |
58 | sg_init_one(&assoc, &aad[2], be16_to_cpup((__be16 *)aad)); | |
59 | sg_init_table(ct, 2); | |
60 | sg_set_buf(&ct[0], data, data_len); | |
61 | sg_set_buf(&ct[1], mic, IEEE80211_CCMP_MIC_LEN); | |
62 | ||
63 | aead_request_set_tfm(&aead_req.req, tfm); | |
64 | aead_request_set_assoc(&aead_req.req, &assoc, assoc.length); | |
65 | aead_request_set_crypt(&aead_req.req, ct, &pt, | |
66 | data_len + IEEE80211_CCMP_MIC_LEN, b_0); | |
67 | ||
68 | return crypto_aead_decrypt(&aead_req.req); | |
f0706e82 JB |
69 | } |
70 | ||
7ec7c4a9 | 71 | struct crypto_aead *ieee80211_aes_key_setup_encrypt(const u8 key[]) |
f0706e82 | 72 | { |
7ec7c4a9 AB |
73 | struct crypto_aead *tfm; |
74 | int err; | |
f0706e82 | 75 | |
7ec7c4a9 AB |
76 | tfm = crypto_alloc_aead("ccm(aes)", 0, CRYPTO_ALG_ASYNC); |
77 | if (IS_ERR(tfm)) | |
78 | return tfm; | |
f0706e82 | 79 | |
7ec7c4a9 AB |
80 | err = crypto_aead_setkey(tfm, key, WLAN_KEY_LEN_CCMP); |
81 | if (!err) | |
82 | err = crypto_aead_setauthsize(tfm, IEEE80211_CCMP_MIC_LEN); | |
83 | if (!err) | |
84 | return tfm; | |
f0706e82 | 85 | |
7ec7c4a9 AB |
86 | crypto_free_aead(tfm); |
87 | return ERR_PTR(err); | |
f0706e82 JB |
88 | } |
89 | ||
7ec7c4a9 | 90 | void ieee80211_aes_key_free(struct crypto_aead *tfm) |
f0706e82 | 91 | { |
7ec7c4a9 | 92 | crypto_free_aead(tfm); |
f0706e82 | 93 | } |