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
aead_encrypt(struct crypto_aead * tfm,u8 * b_0,u8 * aad,size_t aad_len,u8 * data,size_t data_len,u8 * mic)18 int 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
aead_decrypt(struct crypto_aead * tfm,u8 * b_0,u8 * aad,size_t aad_len,u8 * data,size_t data_len,u8 * mic)49 int 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
84 struct crypto_aead *
aead_key_setup_encrypt(const char * alg,const u8 key[],size_t key_len,size_t mic_len)85 aead_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
104 free_aead:
105 crypto_free_aead(tfm);
106 return ERR_PTR(err);
107 }
108
aead_key_free(struct crypto_aead * tfm)109 void aead_key_free(struct crypto_aead *tfm)
110 {
111 crypto_free_aead(tfm);
112 }
113
