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 * Copyright 2014-2015, Qualcomm Atheros, Inc.
5 *
6 * Rewrite: Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <linux/kernel.h>
14#include <linux/types.h>
15#include <linux/err.h>
16#include <linux/scatterlist.h>
17#include <crypto/aead.h>
18
19#include "aead_api.h"
20
21int aead_encrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad, size_t aad_len,
22 u8 *data, size_t data_len, u8 *mic)
23{
24 size_t mic_len = crypto_aead_authsize(tfm);
25 struct scatterlist sg[3];
26 struct aead_request *aead_req;
27 int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm);
28 u8 *__aad;
29
30 aead_req = kzalloc(reqsize + aad_len, GFP_ATOMIC);
31 if (!aead_req)
32 return -ENOMEM;
33
34 __aad = (u8 *)aead_req + reqsize;
35 memcpy(__aad, aad, aad_len);
36
37 sg_init_table(sg, 3);
38 sg_set_buf(&sg[0], __aad, aad_len);
39 sg_set_buf(&sg[1], data, data_len);
40 sg_set_buf(&sg[2], mic, mic_len);
41
42 aead_request_set_tfm(aead_req, tfm);
43 aead_request_set_crypt(aead_req, sg, sg, data_len, b_0);
44 aead_request_set_ad(aead_req, sg[0].length);
45
46 crypto_aead_encrypt(aead_req);
47 kzfree(aead_req);
48
49 return 0;
50}
51
52int aead_decrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad, size_t aad_len,
53 u8 *data, size_t data_len, u8 *mic)
54{
55 size_t mic_len = crypto_aead_authsize(tfm);
56 struct scatterlist sg[3];
57 struct aead_request *aead_req;
58 int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm);
59 u8 *__aad;
60 int err;
61
62 if (data_len == 0)
63 return -EINVAL;
64
65 aead_req = kzalloc(reqsize + aad_len, GFP_ATOMIC);
66 if (!aead_req)
67 return -ENOMEM;
68
69 __aad = (u8 *)aead_req + reqsize;
70 memcpy(__aad, aad, aad_len);
71
72 sg_init_table(sg, 3);
73 sg_set_buf(&sg[0], __aad, aad_len);
74 sg_set_buf(&sg[1], data, data_len);
75 sg_set_buf(&sg[2], mic, mic_len);
76
77 aead_request_set_tfm(aead_req, tfm);
78 aead_request_set_crypt(aead_req, sg, sg, data_len + mic_len, b_0);
79 aead_request_set_ad(aead_req, sg[0].length);
80
81 err = crypto_aead_decrypt(aead_req);
82 kzfree(aead_req);
83
84 return err;
85}
86
87struct crypto_aead *
88aead_key_setup_encrypt(const char *alg, const u8 key[],
89 size_t key_len, size_t mic_len)
90{
91 struct crypto_aead *tfm;
92 int err;
93
94 tfm = crypto_alloc_aead(alg, 0, CRYPTO_ALG_ASYNC);
95 if (IS_ERR(tfm))
96 return tfm;
97
98 err = crypto_aead_setkey(tfm, key, key_len);
99 if (err)
100 goto free_aead;
101 err = crypto_aead_setauthsize(tfm, mic_len);
102 if (err)
103 goto free_aead;
104
105 return tfm;
106
107free_aead:
108 crypto_free_aead(tfm);
109 return ERR_PTR(err);
110}
111
112void aead_key_free(struct crypto_aead *tfm)
113{
114 crypto_free_aead(tfm);
115}