Commit | Line | Data |
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a62b01cd AB |
1 | /* |
2 | * Shared async block cipher helpers | |
3 | * | |
4 | * Copyright (c) 2012 Jussi Kivilinna <jussi.kivilinna@mbnet.fi> | |
5 | * | |
6 | * Based on aesni-intel_glue.c by: | |
7 | * Copyright (C) 2008, Intel Corp. | |
8 | * Author: Huang Ying <ying.huang@intel.com> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
1af39daa | 21 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
a62b01cd AB |
22 | * |
23 | */ | |
24 | ||
25 | #include <linux/kernel.h> | |
26 | #include <linux/crypto.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/module.h> | |
a62b01cd AB |
29 | #include <crypto/algapi.h> |
30 | #include <crypto/cryptd.h> | |
31 | #include <crypto/ablk_helper.h> | |
32 | #include <asm/simd.h> | |
33 | ||
34 | int ablk_set_key(struct crypto_ablkcipher *tfm, const u8 *key, | |
35 | unsigned int key_len) | |
36 | { | |
37 | struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm); | |
38 | struct crypto_ablkcipher *child = &ctx->cryptd_tfm->base; | |
39 | int err; | |
40 | ||
41 | crypto_ablkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK); | |
42 | crypto_ablkcipher_set_flags(child, crypto_ablkcipher_get_flags(tfm) | |
43 | & CRYPTO_TFM_REQ_MASK); | |
44 | err = crypto_ablkcipher_setkey(child, key, key_len); | |
45 | crypto_ablkcipher_set_flags(tfm, crypto_ablkcipher_get_flags(child) | |
46 | & CRYPTO_TFM_RES_MASK); | |
47 | return err; | |
48 | } | |
49 | EXPORT_SYMBOL_GPL(ablk_set_key); | |
50 | ||
51 | int __ablk_encrypt(struct ablkcipher_request *req) | |
52 | { | |
53 | struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req); | |
54 | struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm); | |
55 | struct blkcipher_desc desc; | |
56 | ||
57 | desc.tfm = cryptd_ablkcipher_child(ctx->cryptd_tfm); | |
58 | desc.info = req->info; | |
59 | desc.flags = 0; | |
60 | ||
61 | return crypto_blkcipher_crt(desc.tfm)->encrypt( | |
62 | &desc, req->dst, req->src, req->nbytes); | |
63 | } | |
64 | EXPORT_SYMBOL_GPL(__ablk_encrypt); | |
65 | ||
66 | int ablk_encrypt(struct ablkcipher_request *req) | |
67 | { | |
68 | struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req); | |
69 | struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm); | |
70 | ||
88407a39 HX |
71 | if (!may_use_simd() || |
72 | (in_atomic() && cryptd_ablkcipher_queued(ctx->cryptd_tfm))) { | |
a62b01cd AB |
73 | struct ablkcipher_request *cryptd_req = |
74 | ablkcipher_request_ctx(req); | |
75 | ||
ea493d32 | 76 | *cryptd_req = *req; |
a62b01cd AB |
77 | ablkcipher_request_set_tfm(cryptd_req, &ctx->cryptd_tfm->base); |
78 | ||
79 | return crypto_ablkcipher_encrypt(cryptd_req); | |
80 | } else { | |
81 | return __ablk_encrypt(req); | |
82 | } | |
83 | } | |
84 | EXPORT_SYMBOL_GPL(ablk_encrypt); | |
85 | ||
86 | int ablk_decrypt(struct ablkcipher_request *req) | |
87 | { | |
88 | struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req); | |
89 | struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm); | |
90 | ||
88407a39 HX |
91 | if (!may_use_simd() || |
92 | (in_atomic() && cryptd_ablkcipher_queued(ctx->cryptd_tfm))) { | |
a62b01cd AB |
93 | struct ablkcipher_request *cryptd_req = |
94 | ablkcipher_request_ctx(req); | |
95 | ||
ea493d32 | 96 | *cryptd_req = *req; |
a62b01cd AB |
97 | ablkcipher_request_set_tfm(cryptd_req, &ctx->cryptd_tfm->base); |
98 | ||
99 | return crypto_ablkcipher_decrypt(cryptd_req); | |
100 | } else { | |
101 | struct blkcipher_desc desc; | |
102 | ||
103 | desc.tfm = cryptd_ablkcipher_child(ctx->cryptd_tfm); | |
104 | desc.info = req->info; | |
105 | desc.flags = 0; | |
106 | ||
107 | return crypto_blkcipher_crt(desc.tfm)->decrypt( | |
108 | &desc, req->dst, req->src, req->nbytes); | |
109 | } | |
110 | } | |
111 | EXPORT_SYMBOL_GPL(ablk_decrypt); | |
112 | ||
113 | void ablk_exit(struct crypto_tfm *tfm) | |
114 | { | |
115 | struct async_helper_ctx *ctx = crypto_tfm_ctx(tfm); | |
116 | ||
117 | cryptd_free_ablkcipher(ctx->cryptd_tfm); | |
118 | } | |
119 | EXPORT_SYMBOL_GPL(ablk_exit); | |
120 | ||
121 | int ablk_init_common(struct crypto_tfm *tfm, const char *drv_name) | |
122 | { | |
123 | struct async_helper_ctx *ctx = crypto_tfm_ctx(tfm); | |
124 | struct cryptd_ablkcipher *cryptd_tfm; | |
125 | ||
466a7b9e SM |
126 | cryptd_tfm = cryptd_alloc_ablkcipher(drv_name, CRYPTO_ALG_INTERNAL, |
127 | CRYPTO_ALG_INTERNAL); | |
a62b01cd AB |
128 | if (IS_ERR(cryptd_tfm)) |
129 | return PTR_ERR(cryptd_tfm); | |
130 | ||
131 | ctx->cryptd_tfm = cryptd_tfm; | |
132 | tfm->crt_ablkcipher.reqsize = sizeof(struct ablkcipher_request) + | |
133 | crypto_ablkcipher_reqsize(&cryptd_tfm->base); | |
134 | ||
135 | return 0; | |
136 | } | |
137 | EXPORT_SYMBOL_GPL(ablk_init_common); | |
138 | ||
139 | int ablk_init(struct crypto_tfm *tfm) | |
140 | { | |
141 | char drv_name[CRYPTO_MAX_ALG_NAME]; | |
142 | ||
143 | snprintf(drv_name, sizeof(drv_name), "__driver-%s", | |
144 | crypto_tfm_alg_driver_name(tfm)); | |
145 | ||
146 | return ablk_init_common(tfm, drv_name); | |
147 | } | |
148 | EXPORT_SYMBOL_GPL(ablk_init); | |
149 | ||
150 | MODULE_LICENSE("GPL"); |