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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 | ||
f4a067f9 AB |
18 | int ieee80211_aes_gcm_encrypt(struct crypto_aead *tfm, u8 *j_0, u8 *aad, |
19 | u8 *data, size_t data_len, u8 *mic) | |
00b9cfa3 | 20 | { |
957e0fe6 | 21 | struct scatterlist sg[3]; |
f4a067f9 AB |
22 | struct aead_request *aead_req; |
23 | int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm); | |
24 | u8 *__aad; | |
00b9cfa3 | 25 | |
f4a067f9 AB |
26 | aead_req = kzalloc(reqsize + GCM_AAD_LEN, GFP_ATOMIC); |
27 | if (!aead_req) | |
28 | return -ENOMEM; | |
00b9cfa3 | 29 | |
f4a067f9 AB |
30 | __aad = (u8 *)aead_req + reqsize; |
31 | memcpy(__aad, aad, GCM_AAD_LEN); | |
00b9cfa3 | 32 | |
957e0fe6 | 33 | sg_init_table(sg, 3); |
f4a067f9 | 34 | sg_set_buf(&sg[0], &__aad[2], be16_to_cpup((__be16 *)__aad)); |
957e0fe6 HX |
35 | sg_set_buf(&sg[1], data, data_len); |
36 | sg_set_buf(&sg[2], mic, IEEE80211_GCMP_MIC_LEN); | |
00b9cfa3 JM |
37 | |
38 | aead_request_set_tfm(aead_req, tfm); | |
957e0fe6 HX |
39 | aead_request_set_crypt(aead_req, sg, sg, data_len, j_0); |
40 | aead_request_set_ad(aead_req, sg[0].length); | |
00b9cfa3 JM |
41 | |
42 | crypto_aead_encrypt(aead_req); | |
f4a067f9 AB |
43 | kzfree(aead_req); |
44 | return 0; | |
00b9cfa3 JM |
45 | } |
46 | ||
47 | int ieee80211_aes_gcm_decrypt(struct crypto_aead *tfm, u8 *j_0, u8 *aad, | |
48 | u8 *data, size_t data_len, u8 *mic) | |
49 | { | |
957e0fe6 | 50 | struct scatterlist sg[3]; |
f4a067f9 AB |
51 | struct aead_request *aead_req; |
52 | int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm); | |
53 | u8 *__aad; | |
54 | int err; | |
00b9cfa3 JM |
55 | |
56 | if (data_len == 0) | |
57 | return -EINVAL; | |
58 | ||
f4a067f9 AB |
59 | aead_req = kzalloc(reqsize + GCM_AAD_LEN, GFP_ATOMIC); |
60 | if (!aead_req) | |
61 | return -ENOMEM; | |
62 | ||
63 | __aad = (u8 *)aead_req + reqsize; | |
64 | memcpy(__aad, aad, GCM_AAD_LEN); | |
00b9cfa3 | 65 | |
957e0fe6 | 66 | sg_init_table(sg, 3); |
f4a067f9 | 67 | sg_set_buf(&sg[0], &__aad[2], be16_to_cpup((__be16 *)__aad)); |
957e0fe6 HX |
68 | sg_set_buf(&sg[1], data, data_len); |
69 | sg_set_buf(&sg[2], mic, IEEE80211_GCMP_MIC_LEN); | |
00b9cfa3 JM |
70 | |
71 | aead_request_set_tfm(aead_req, tfm); | |
957e0fe6 | 72 | aead_request_set_crypt(aead_req, sg, sg, |
00b9cfa3 | 73 | data_len + IEEE80211_GCMP_MIC_LEN, j_0); |
957e0fe6 | 74 | aead_request_set_ad(aead_req, sg[0].length); |
00b9cfa3 | 75 | |
f4a067f9 AB |
76 | err = crypto_aead_decrypt(aead_req); |
77 | kzfree(aead_req); | |
78 | ||
79 | return err; | |
00b9cfa3 JM |
80 | } |
81 | ||
82 | struct crypto_aead *ieee80211_aes_gcm_key_setup_encrypt(const u8 key[], | |
83 | size_t key_len) | |
84 | { | |
85 | struct crypto_aead *tfm; | |
86 | int err; | |
87 | ||
88 | tfm = crypto_alloc_aead("gcm(aes)", 0, CRYPTO_ALG_ASYNC); | |
89 | if (IS_ERR(tfm)) | |
90 | return tfm; | |
91 | ||
92 | err = crypto_aead_setkey(tfm, key, key_len); | |
07862e13 JB |
93 | if (err) |
94 | goto free_aead; | |
95 | err = crypto_aead_setauthsize(tfm, IEEE80211_GCMP_MIC_LEN); | |
96 | if (err) | |
97 | goto free_aead; | |
98 | ||
99 | return tfm; | |
00b9cfa3 | 100 | |
07862e13 | 101 | free_aead: |
00b9cfa3 JM |
102 | crypto_free_aead(tfm); |
103 | return ERR_PTR(err); | |
104 | } | |
105 | ||
106 | void ieee80211_aes_gcm_key_free(struct crypto_aead *tfm) | |
107 | { | |
108 | crypto_free_aead(tfm); | |
109 | } |