Commit | Line | Data |
---|---|---|
00b9cfa3 JM |
1 | /* |
2 | * Copyright 2014-2015, Qualcomm Atheros, Inc. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | */ | |
8 | ||
9 | #include <linux/kernel.h> | |
10 | #include <linux/types.h> | |
00b9cfa3 | 11 | #include <linux/err.h> |
d8fe0ddd | 12 | #include <crypto/aead.h> |
00b9cfa3 JM |
13 | |
14 | #include <net/mac80211.h> | |
15 | #include "key.h" | |
16 | #include "aes_gcm.h" | |
17 | ||
18 | void ieee80211_aes_gcm_encrypt(struct crypto_aead *tfm, u8 *j_0, u8 *aad, | |
19 | u8 *data, size_t data_len, u8 *mic) | |
20 | { | |
957e0fe6 | 21 | struct scatterlist sg[3]; |
00b9cfa3 JM |
22 | |
23 | char aead_req_data[sizeof(struct aead_request) + | |
24 | crypto_aead_reqsize(tfm)] | |
25 | __aligned(__alignof__(struct aead_request)); | |
26 | struct aead_request *aead_req = (void *)aead_req_data; | |
27 | ||
28 | memset(aead_req, 0, sizeof(aead_req_data)); | |
29 | ||
957e0fe6 HX |
30 | sg_init_table(sg, 3); |
31 | sg_set_buf(&sg[0], &aad[2], be16_to_cpup((__be16 *)aad)); | |
32 | sg_set_buf(&sg[1], data, data_len); | |
33 | sg_set_buf(&sg[2], mic, IEEE80211_GCMP_MIC_LEN); | |
00b9cfa3 JM |
34 | |
35 | aead_request_set_tfm(aead_req, tfm); | |
957e0fe6 HX |
36 | aead_request_set_crypt(aead_req, sg, sg, data_len, j_0); |
37 | aead_request_set_ad(aead_req, sg[0].length); | |
00b9cfa3 JM |
38 | |
39 | crypto_aead_encrypt(aead_req); | |
40 | } | |
41 | ||
42 | int ieee80211_aes_gcm_decrypt(struct crypto_aead *tfm, u8 *j_0, u8 *aad, | |
43 | u8 *data, size_t data_len, u8 *mic) | |
44 | { | |
957e0fe6 | 45 | struct scatterlist sg[3]; |
00b9cfa3 JM |
46 | char aead_req_data[sizeof(struct aead_request) + |
47 | crypto_aead_reqsize(tfm)] | |
48 | __aligned(__alignof__(struct aead_request)); | |
49 | struct aead_request *aead_req = (void *)aead_req_data; | |
50 | ||
51 | if (data_len == 0) | |
52 | return -EINVAL; | |
53 | ||
54 | memset(aead_req, 0, sizeof(aead_req_data)); | |
55 | ||
957e0fe6 HX |
56 | sg_init_table(sg, 3); |
57 | sg_set_buf(&sg[0], &aad[2], be16_to_cpup((__be16 *)aad)); | |
58 | sg_set_buf(&sg[1], data, data_len); | |
59 | sg_set_buf(&sg[2], mic, IEEE80211_GCMP_MIC_LEN); | |
00b9cfa3 JM |
60 | |
61 | aead_request_set_tfm(aead_req, tfm); | |
957e0fe6 | 62 | aead_request_set_crypt(aead_req, sg, sg, |
00b9cfa3 | 63 | data_len + IEEE80211_GCMP_MIC_LEN, j_0); |
957e0fe6 | 64 | aead_request_set_ad(aead_req, sg[0].length); |
00b9cfa3 JM |
65 | |
66 | return crypto_aead_decrypt(aead_req); | |
67 | } | |
68 | ||
69 | struct crypto_aead *ieee80211_aes_gcm_key_setup_encrypt(const u8 key[], | |
70 | size_t key_len) | |
71 | { | |
72 | struct crypto_aead *tfm; | |
73 | int err; | |
74 | ||
75 | tfm = crypto_alloc_aead("gcm(aes)", 0, CRYPTO_ALG_ASYNC); | |
76 | if (IS_ERR(tfm)) | |
77 | return tfm; | |
78 | ||
79 | err = crypto_aead_setkey(tfm, key, key_len); | |
07862e13 JB |
80 | if (err) |
81 | goto free_aead; | |
82 | err = crypto_aead_setauthsize(tfm, IEEE80211_GCMP_MIC_LEN); | |
83 | if (err) | |
84 | goto free_aead; | |
85 | ||
86 | return tfm; | |
00b9cfa3 | 87 | |
07862e13 | 88 | free_aead: |
00b9cfa3 JM |
89 | crypto_free_aead(tfm); |
90 | return ERR_PTR(err); | |
91 | } | |
92 | ||
93 | void ieee80211_aes_gcm_key_free(struct crypto_aead *tfm) | |
94 | { | |
95 | crypto_free_aead(tfm); | |
96 | } |