1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright 2003-2004, Instant802 Networks, Inc.
4*4882a593Smuzhiyun * Copyright 2005-2006, Devicescape Software, Inc.
5*4882a593Smuzhiyun * Copyright 2014-2015, Qualcomm Atheros, Inc.
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Rewrite: Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org>
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include <linux/kernel.h>
11*4882a593Smuzhiyun #include <linux/types.h>
12*4882a593Smuzhiyun #include <linux/err.h>
13*4882a593Smuzhiyun #include <linux/scatterlist.h>
14*4882a593Smuzhiyun #include <crypto/aead.h>
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun #include "aead_api.h"
17*4882a593Smuzhiyun
aead_encrypt(struct crypto_aead * tfm,u8 * b_0,u8 * aad,size_t aad_len,u8 * data,size_t data_len,u8 * mic)18*4882a593Smuzhiyun int aead_encrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad, size_t aad_len,
19*4882a593Smuzhiyun u8 *data, size_t data_len, u8 *mic)
20*4882a593Smuzhiyun {
21*4882a593Smuzhiyun size_t mic_len = crypto_aead_authsize(tfm);
22*4882a593Smuzhiyun struct scatterlist sg[3];
23*4882a593Smuzhiyun struct aead_request *aead_req;
24*4882a593Smuzhiyun int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm);
25*4882a593Smuzhiyun u8 *__aad;
26*4882a593Smuzhiyun int ret;
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun aead_req = kzalloc(reqsize + aad_len, GFP_ATOMIC);
29*4882a593Smuzhiyun if (!aead_req)
30*4882a593Smuzhiyun return -ENOMEM;
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun __aad = (u8 *)aead_req + reqsize;
33*4882a593Smuzhiyun memcpy(__aad, aad, aad_len);
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun sg_init_table(sg, 3);
36*4882a593Smuzhiyun sg_set_buf(&sg[0], __aad, aad_len);
37*4882a593Smuzhiyun sg_set_buf(&sg[1], data, data_len);
38*4882a593Smuzhiyun sg_set_buf(&sg[2], mic, mic_len);
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun aead_request_set_tfm(aead_req, tfm);
41*4882a593Smuzhiyun aead_request_set_crypt(aead_req, sg, sg, data_len, b_0);
42*4882a593Smuzhiyun aead_request_set_ad(aead_req, sg[0].length);
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun ret = crypto_aead_encrypt(aead_req);
45*4882a593Smuzhiyun kfree_sensitive(aead_req);
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun return ret;
48*4882a593Smuzhiyun }
49*4882a593Smuzhiyun
aead_decrypt(struct crypto_aead * tfm,u8 * b_0,u8 * aad,size_t aad_len,u8 * data,size_t data_len,u8 * mic)50*4882a593Smuzhiyun int aead_decrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad, size_t aad_len,
51*4882a593Smuzhiyun u8 *data, size_t data_len, u8 *mic)
52*4882a593Smuzhiyun {
53*4882a593Smuzhiyun size_t mic_len = crypto_aead_authsize(tfm);
54*4882a593Smuzhiyun struct scatterlist sg[3];
55*4882a593Smuzhiyun struct aead_request *aead_req;
56*4882a593Smuzhiyun int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm);
57*4882a593Smuzhiyun u8 *__aad;
58*4882a593Smuzhiyun int err;
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun if (data_len == 0)
61*4882a593Smuzhiyun return -EINVAL;
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun aead_req = kzalloc(reqsize + aad_len, GFP_ATOMIC);
64*4882a593Smuzhiyun if (!aead_req)
65*4882a593Smuzhiyun return -ENOMEM;
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun __aad = (u8 *)aead_req + reqsize;
68*4882a593Smuzhiyun memcpy(__aad, aad, aad_len);
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun sg_init_table(sg, 3);
71*4882a593Smuzhiyun sg_set_buf(&sg[0], __aad, aad_len);
72*4882a593Smuzhiyun sg_set_buf(&sg[1], data, data_len);
73*4882a593Smuzhiyun sg_set_buf(&sg[2], mic, mic_len);
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun aead_request_set_tfm(aead_req, tfm);
76*4882a593Smuzhiyun aead_request_set_crypt(aead_req, sg, sg, data_len + mic_len, b_0);
77*4882a593Smuzhiyun aead_request_set_ad(aead_req, sg[0].length);
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun err = crypto_aead_decrypt(aead_req);
80*4882a593Smuzhiyun kfree_sensitive(aead_req);
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun return err;
83*4882a593Smuzhiyun }
84*4882a593Smuzhiyun
85*4882a593Smuzhiyun struct crypto_aead *
aead_key_setup_encrypt(const char * alg,const u8 key[],size_t key_len,size_t mic_len)86*4882a593Smuzhiyun aead_key_setup_encrypt(const char *alg, const u8 key[],
87*4882a593Smuzhiyun size_t key_len, size_t mic_len)
88*4882a593Smuzhiyun {
89*4882a593Smuzhiyun struct crypto_aead *tfm;
90*4882a593Smuzhiyun int err;
91*4882a593Smuzhiyun
92*4882a593Smuzhiyun tfm = crypto_alloc_aead(alg, 0, CRYPTO_ALG_ASYNC);
93*4882a593Smuzhiyun if (IS_ERR(tfm))
94*4882a593Smuzhiyun return tfm;
95*4882a593Smuzhiyun
96*4882a593Smuzhiyun err = crypto_aead_setkey(tfm, key, key_len);
97*4882a593Smuzhiyun if (err)
98*4882a593Smuzhiyun goto free_aead;
99*4882a593Smuzhiyun err = crypto_aead_setauthsize(tfm, mic_len);
100*4882a593Smuzhiyun if (err)
101*4882a593Smuzhiyun goto free_aead;
102*4882a593Smuzhiyun
103*4882a593Smuzhiyun return tfm;
104*4882a593Smuzhiyun
105*4882a593Smuzhiyun free_aead:
106*4882a593Smuzhiyun crypto_free_aead(tfm);
107*4882a593Smuzhiyun return ERR_PTR(err);
108*4882a593Smuzhiyun }
109*4882a593Smuzhiyun
aead_key_free(struct crypto_aead * tfm)110*4882a593Smuzhiyun void aead_key_free(struct crypto_aead *tfm)
111*4882a593Smuzhiyun {
112*4882a593Smuzhiyun crypto_free_aead(tfm);
113*4882a593Smuzhiyun }
114