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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2003-2004, Instant802 Networks, Inc.
4 * Copyright 2005-2006, Devicescape Software, Inc.
5 * Copyright 2014-2015, Qualcomm Atheros, Inc.
6 *
7 * Rewrite: Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org>
8 */
9
10#include <linux/kernel.h>
11#include <linux/types.h>
12#include <linux/err.h>
13#include <linux/scatterlist.h>
14#include <crypto/aead.h>
15
16#include "aead_api.h"
17
18int aead_encrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad, size_t aad_len,
19 u8 *data, size_t data_len, u8 *mic)
20{
21 size_t mic_len = crypto_aead_authsize(tfm);
22 struct scatterlist sg[3];
23 struct aead_request *aead_req;
24 int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm);
25 u8 *__aad;
26 int ret;
27
28 aead_req = kzalloc(reqsize + aad_len, GFP_ATOMIC);
29 if (!aead_req)
30 return -ENOMEM;
31
32 __aad = (u8 *)aead_req + reqsize;
33 memcpy(__aad, aad, aad_len);
34
35 sg_init_table(sg, 3);
36 sg_set_buf(&sg[0], __aad, aad_len);
37 sg_set_buf(&sg[1], data, data_len);
38 sg_set_buf(&sg[2], mic, mic_len);
39
40 aead_request_set_tfm(aead_req, tfm);
41 aead_request_set_crypt(aead_req, sg, sg, data_len, b_0);
42 aead_request_set_ad(aead_req, sg[0].length);
43
44 ret = crypto_aead_encrypt(aead_req);
45 kfree_sensitive(aead_req);
46
47 return ret;
48}
49
50int aead_decrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad, size_t aad_len,
51 u8 *data, size_t data_len, u8 *mic)
52{
53 size_t mic_len = crypto_aead_authsize(tfm);
54 struct scatterlist sg[3];
55 struct aead_request *aead_req;
56 int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm);
57 u8 *__aad;
58 int err;
59
60 if (data_len == 0)
61 return -EINVAL;
62
63 aead_req = kzalloc(reqsize + aad_len, GFP_ATOMIC);
64 if (!aead_req)
65 return -ENOMEM;
66
67 __aad = (u8 *)aead_req + reqsize;
68 memcpy(__aad, aad, aad_len);
69
70 sg_init_table(sg, 3);
71 sg_set_buf(&sg[0], __aad, aad_len);
72 sg_set_buf(&sg[1], data, data_len);
73 sg_set_buf(&sg[2], mic, mic_len);
74
75 aead_request_set_tfm(aead_req, tfm);
76 aead_request_set_crypt(aead_req, sg, sg, data_len + mic_len, b_0);
77 aead_request_set_ad(aead_req, sg[0].length);
78
79 err = crypto_aead_decrypt(aead_req);
80 kfree_sensitive(aead_req);
81
82 return err;
83}
84
85struct crypto_aead *
86aead_key_setup_encrypt(const char *alg, const u8 key[],
87 size_t key_len, size_t mic_len)
88{
89 struct crypto_aead *tfm;
90 int err;
91
92 tfm = crypto_alloc_aead(alg, 0, CRYPTO_ALG_ASYNC);
93 if (IS_ERR(tfm))
94 return tfm;
95
96 err = crypto_aead_setkey(tfm, key, key_len);
97 if (err)
98 goto free_aead;
99 err = crypto_aead_setauthsize(tfm, mic_len);
100 if (err)
101 goto free_aead;
102
103 return tfm;
104
105free_aead:
106 crypto_free_aead(tfm);
107 return ERR_PTR(err);
108}
109
110void aead_key_free(struct crypto_aead *tfm)
111{
112 crypto_free_aead(tfm);
113}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2003-2004, Instant802 Networks, Inc.
4 * Copyright 2005-2006, Devicescape Software, Inc.
5 * Copyright 2014-2015, Qualcomm Atheros, Inc.
6 *
7 * Rewrite: Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org>
8 */
9
10#include <linux/kernel.h>
11#include <linux/types.h>
12#include <linux/err.h>
13#include <linux/scatterlist.h>
14#include <crypto/aead.h>
15
16#include "aead_api.h"
17
18int aead_encrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad, size_t aad_len,
19 u8 *data, size_t data_len, u8 *mic)
20{
21 size_t mic_len = crypto_aead_authsize(tfm);
22 struct scatterlist sg[3];
23 struct aead_request *aead_req;
24 int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm);
25 u8 *__aad;
26
27 aead_req = kzalloc(reqsize + aad_len, GFP_ATOMIC);
28 if (!aead_req)
29 return -ENOMEM;
30
31 __aad = (u8 *)aead_req + reqsize;
32 memcpy(__aad, aad, aad_len);
33
34 sg_init_table(sg, 3);
35 sg_set_buf(&sg[0], __aad, aad_len);
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 kfree_sensitive(aead_req);
45
46 return 0;
47}
48
49int aead_decrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad, size_t aad_len,
50 u8 *data, size_t data_len, u8 *mic)
51{
52 size_t mic_len = crypto_aead_authsize(tfm);
53 struct scatterlist sg[3];
54 struct aead_request *aead_req;
55 int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm);
56 u8 *__aad;
57 int err;
58
59 if (data_len == 0)
60 return -EINVAL;
61
62 aead_req = kzalloc(reqsize + aad_len, GFP_ATOMIC);
63 if (!aead_req)
64 return -ENOMEM;
65
66 __aad = (u8 *)aead_req + reqsize;
67 memcpy(__aad, aad, aad_len);
68
69 sg_init_table(sg, 3);
70 sg_set_buf(&sg[0], __aad, aad_len);
71 sg_set_buf(&sg[1], data, data_len);
72 sg_set_buf(&sg[2], mic, mic_len);
73
74 aead_request_set_tfm(aead_req, tfm);
75 aead_request_set_crypt(aead_req, sg, sg, data_len + mic_len, b_0);
76 aead_request_set_ad(aead_req, sg[0].length);
77
78 err = crypto_aead_decrypt(aead_req);
79 kfree_sensitive(aead_req);
80
81 return err;
82}
83
84struct crypto_aead *
85aead_key_setup_encrypt(const char *alg, const u8 key[],
86 size_t key_len, size_t mic_len)
87{
88 struct crypto_aead *tfm;
89 int err;
90
91 tfm = crypto_alloc_aead(alg, 0, CRYPTO_ALG_ASYNC);
92 if (IS_ERR(tfm))
93 return tfm;
94
95 err = crypto_aead_setkey(tfm, key, key_len);
96 if (err)
97 goto free_aead;
98 err = crypto_aead_setauthsize(tfm, mic_len);
99 if (err)
100 goto free_aead;
101
102 return tfm;
103
104free_aead:
105 crypto_free_aead(tfm);
106 return ERR_PTR(err);
107}
108
109void aead_key_free(struct crypto_aead *tfm)
110{
111 crypto_free_aead(tfm);
112}