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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; | |
58d25626 | 26 | int ret; |
f0706e82 | 27 | |
4133da73 | 28 | aead_req = kzalloc(reqsize + aad_len, GFP_ATOMIC); |
f4a067f9 AB |
29 | if (!aead_req) |
30 | return -ENOMEM; | |
6e1ee5d2 | 31 | |
f4a067f9 | 32 | __aad = (u8 *)aead_req + reqsize; |
4133da73 | 33 | memcpy(__aad, aad, aad_len); |
f0706e82 | 34 | |
957e0fe6 | 35 | sg_init_table(sg, 3); |
4133da73 | 36 | sg_set_buf(&sg[0], __aad, aad_len); |
957e0fe6 HX |
37 | sg_set_buf(&sg[1], data, data_len); |
38 | sg_set_buf(&sg[2], mic, mic_len); | |
f0706e82 | 39 | |
6e1ee5d2 | 40 | aead_request_set_tfm(aead_req, tfm); |
957e0fe6 HX |
41 | aead_request_set_crypt(aead_req, sg, sg, data_len, b_0); |
42 | aead_request_set_ad(aead_req, sg[0].length); | |
f0706e82 | 43 | |
58d25626 | 44 | ret = crypto_aead_encrypt(aead_req); |
453431a5 | 45 | kfree_sensitive(aead_req); |
f4a067f9 | 46 | |
58d25626 | 47 | return ret; |
f0706e82 JB |
48 | } |
49 | ||
4133da73 XG |
50 | int aead_decrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad, size_t aad_len, |
51 | u8 *data, size_t data_len, u8 *mic) | |
f0706e82 | 52 | { |
9e97964d | 53 | size_t mic_len = crypto_aead_authsize(tfm); |
957e0fe6 | 54 | struct scatterlist sg[3]; |
f4a067f9 AB |
55 | struct aead_request *aead_req; |
56 | int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm); | |
57 | u8 *__aad; | |
58 | int err; | |
7ec7c4a9 | 59 | |
4f031fa9 RW |
60 | if (data_len == 0) |
61 | return -EINVAL; | |
62 | ||
4133da73 | 63 | aead_req = kzalloc(reqsize + aad_len, GFP_ATOMIC); |
f4a067f9 AB |
64 | if (!aead_req) |
65 | return -ENOMEM; | |
66 | ||
67 | __aad = (u8 *)aead_req + reqsize; | |
4133da73 | 68 | memcpy(__aad, aad, aad_len); |
7ec7c4a9 | 69 | |
957e0fe6 | 70 | sg_init_table(sg, 3); |
4133da73 | 71 | sg_set_buf(&sg[0], __aad, aad_len); |
957e0fe6 HX |
72 | sg_set_buf(&sg[1], data, data_len); |
73 | sg_set_buf(&sg[2], mic, mic_len); | |
7ec7c4a9 | 74 | |
6e1ee5d2 | 75 | aead_request_set_tfm(aead_req, tfm); |
957e0fe6 HX |
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); | |
7ec7c4a9 | 78 | |
f4a067f9 | 79 | err = crypto_aead_decrypt(aead_req); |
453431a5 | 80 | kfree_sensitive(aead_req); |
f4a067f9 AB |
81 | |
82 | return err; | |
f0706e82 JB |
83 | } |
84 | ||
4133da73 XG |
85 | struct crypto_aead * |
86 | aead_key_setup_encrypt(const char *alg, const u8 key[], | |
87 | size_t key_len, size_t mic_len) | |
f0706e82 | 88 | { |
7ec7c4a9 AB |
89 | struct crypto_aead *tfm; |
90 | int err; | |
f0706e82 | 91 | |
4133da73 | 92 | tfm = crypto_alloc_aead(alg, 0, CRYPTO_ALG_ASYNC); |
7ec7c4a9 AB |
93 | if (IS_ERR(tfm)) |
94 | return tfm; | |
f0706e82 | 95 | |
2b2ba0db | 96 | err = crypto_aead_setkey(tfm, key, key_len); |
45fd6329 DC |
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; | |
f0706e82 | 104 | |
45fd6329 | 105 | free_aead: |
7ec7c4a9 AB |
106 | crypto_free_aead(tfm); |
107 | return ERR_PTR(err); | |
f0706e82 JB |
108 | } |
109 | ||
4133da73 | 110 | void aead_key_free(struct crypto_aead *tfm) |
f0706e82 | 111 | { |
7ec7c4a9 | 112 | crypto_free_aead(tfm); |
f0706e82 | 113 | } |