Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
f0706e82 JB |
2 | /* |
3 | * Copyright 2003-2004, Instant802 Networks, Inc. | |
4 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4133da73 | 5 | * Copyright 2014-2015, Qualcomm Atheros, Inc. |
f0706e82 | 6 | * |
7ec7c4a9 | 7 | * Rewrite: Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org> |
f0706e82 JB |
8 | */ |
9 | ||
172589cc | 10 | #include <linux/kernel.h> |
f0706e82 | 11 | #include <linux/types.h> |
f0706e82 | 12 | #include <linux/err.h> |
4133da73 | 13 | #include <linux/scatterlist.h> |
d8fe0ddd | 14 | #include <crypto/aead.h> |
f0706e82 | 15 | |
4133da73 | 16 | #include "aead_api.h" |
f0706e82 | 17 | |
4133da73 XG |
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) | |
f0706e82 | 20 | { |
9e97964d | 21 | size_t mic_len = crypto_aead_authsize(tfm); |
957e0fe6 | 22 | struct scatterlist sg[3]; |
f4a067f9 AB |
23 | struct aead_request *aead_req; |
24 | int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm); | |
25 | u8 *__aad; | |
f0706e82 | 26 | |
4133da73 | 27 | aead_req = kzalloc(reqsize + aad_len, GFP_ATOMIC); |
f4a067f9 AB |
28 | if (!aead_req) |
29 | return -ENOMEM; | |
6e1ee5d2 | 30 | |
f4a067f9 | 31 | __aad = (u8 *)aead_req + reqsize; |
4133da73 | 32 | memcpy(__aad, aad, aad_len); |
f0706e82 | 33 | |
957e0fe6 | 34 | sg_init_table(sg, 3); |
4133da73 | 35 | sg_set_buf(&sg[0], __aad, aad_len); |
957e0fe6 HX |
36 | sg_set_buf(&sg[1], data, data_len); |
37 | sg_set_buf(&sg[2], mic, mic_len); | |
f0706e82 | 38 | |
6e1ee5d2 | 39 | aead_request_set_tfm(aead_req, tfm); |
957e0fe6 HX |
40 | aead_request_set_crypt(aead_req, sg, sg, data_len, b_0); |
41 | aead_request_set_ad(aead_req, sg[0].length); | |
f0706e82 | 42 | |
6e1ee5d2 | 43 | crypto_aead_encrypt(aead_req); |
f4a067f9 AB |
44 | kzfree(aead_req); |
45 | ||
46 | return 0; | |
f0706e82 JB |
47 | } |
48 | ||
4133da73 XG |
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) | |
f0706e82 | 51 | { |
9e97964d | 52 | size_t mic_len = crypto_aead_authsize(tfm); |
957e0fe6 | 53 | struct scatterlist sg[3]; |
f4a067f9 AB |
54 | struct aead_request *aead_req; |
55 | int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm); | |
56 | u8 *__aad; | |
57 | int err; | |
7ec7c4a9 | 58 | |
4f031fa9 RW |
59 | if (data_len == 0) |
60 | return -EINVAL; | |
61 | ||
4133da73 | 62 | aead_req = kzalloc(reqsize + aad_len, GFP_ATOMIC); |
f4a067f9 AB |
63 | if (!aead_req) |
64 | return -ENOMEM; | |
65 | ||
66 | __aad = (u8 *)aead_req + reqsize; | |
4133da73 | 67 | memcpy(__aad, aad, aad_len); |
7ec7c4a9 | 68 | |
957e0fe6 | 69 | sg_init_table(sg, 3); |
4133da73 | 70 | sg_set_buf(&sg[0], __aad, aad_len); |
957e0fe6 HX |
71 | sg_set_buf(&sg[1], data, data_len); |
72 | sg_set_buf(&sg[2], mic, mic_len); | |
7ec7c4a9 | 73 | |
6e1ee5d2 | 74 | aead_request_set_tfm(aead_req, tfm); |
957e0fe6 HX |
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); | |
7ec7c4a9 | 77 | |
f4a067f9 AB |
78 | err = crypto_aead_decrypt(aead_req); |
79 | kzfree(aead_req); | |
80 | ||
81 | return err; | |
f0706e82 JB |
82 | } |
83 | ||
4133da73 XG |
84 | struct crypto_aead * |
85 | aead_key_setup_encrypt(const char *alg, const u8 key[], | |
86 | size_t key_len, size_t mic_len) | |
f0706e82 | 87 | { |
7ec7c4a9 AB |
88 | struct crypto_aead *tfm; |
89 | int err; | |
f0706e82 | 90 | |
4133da73 | 91 | tfm = crypto_alloc_aead(alg, 0, CRYPTO_ALG_ASYNC); |
7ec7c4a9 AB |
92 | if (IS_ERR(tfm)) |
93 | return tfm; | |
f0706e82 | 94 | |
2b2ba0db | 95 | err = crypto_aead_setkey(tfm, key, key_len); |
45fd6329 DC |
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; | |
f0706e82 | 103 | |
45fd6329 | 104 | free_aead: |
7ec7c4a9 AB |
105 | crypto_free_aead(tfm); |
106 | return ERR_PTR(err); | |
f0706e82 JB |
107 | } |
108 | ||
4133da73 | 109 | void aead_key_free(struct crypto_aead *tfm) |
f0706e82 | 110 | { |
7ec7c4a9 | 111 | crypto_free_aead(tfm); |
f0706e82 | 112 | } |