tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/crypto.h>
15#include <linux/err.h>
16#include <crypto/aes.h>
17
18#include <net/mac80211.h>
19#include "key.h"
20#include "aes_ccm.h"
21
22void ieee80211_aes_ccm_encrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad,
23 u8 *data, size_t data_len, u8 *mic)
24{
25 struct scatterlist assoc, pt, ct[2];
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_one(&pt, data, data_len);
35 sg_init_one(&assoc, &aad[2], be16_to_cpup((__be16 *)aad));
36 sg_init_table(ct, 2);
37 sg_set_buf(&ct[0], data, data_len);
38 sg_set_buf(&ct[1], mic, IEEE80211_CCMP_MIC_LEN);
39
40 aead_request_set_tfm(aead_req, tfm);
41 aead_request_set_assoc(aead_req, &assoc, assoc.length);
42 aead_request_set_crypt(aead_req, &pt, ct, data_len, b_0);
43
44 crypto_aead_encrypt(aead_req);
45}
46
47int ieee80211_aes_ccm_decrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad,
48 u8 *data, size_t data_len, u8 *mic)
49{
50 struct scatterlist assoc, pt, ct[2];
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 memset(aead_req, 0, sizeof(aead_req_data));
57
58 sg_init_one(&pt, data, data_len);
59 sg_init_one(&assoc, &aad[2], be16_to_cpup((__be16 *)aad));
60 sg_init_table(ct, 2);
61 sg_set_buf(&ct[0], data, data_len);
62 sg_set_buf(&ct[1], mic, IEEE80211_CCMP_MIC_LEN);
63
64 aead_request_set_tfm(aead_req, tfm);
65 aead_request_set_assoc(aead_req, &assoc, assoc.length);
66 aead_request_set_crypt(aead_req, ct, &pt,
67 data_len + IEEE80211_CCMP_MIC_LEN, b_0);
68
69 return crypto_aead_decrypt(aead_req);
70}
71
72struct crypto_aead *ieee80211_aes_key_setup_encrypt(const u8 key[])
73{
74 struct crypto_aead *tfm;
75 int err;
76
77 tfm = crypto_alloc_aead("ccm(aes)", 0, CRYPTO_ALG_ASYNC);
78 if (IS_ERR(tfm))
79 return tfm;
80
81 err = crypto_aead_setkey(tfm, key, WLAN_KEY_LEN_CCMP);
82 if (!err)
83 err = crypto_aead_setauthsize(tfm, IEEE80211_CCMP_MIC_LEN);
84 if (!err)
85 return tfm;
86
87 crypto_free_aead(tfm);
88 return ERR_PTR(err);
89}
90
91void ieee80211_aes_key_free(struct crypto_aead *tfm)
92{
93 crypto_free_aead(tfm);
94}