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
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
23 * USA
24 *
25 */
26
27 #include <linux/kernel.h>
28 #include <linux/crypto.h>
29 #include <linux/init.h>
30 #include <linux/module.h>
31 #include <linux/hardirq.h>
32 #include <crypto/algapi.h>
33 #include <crypto/cryptd.h>
34 #include <crypto/ablk_helper.h>
35 #include <asm/simd.h>
36
ablk_set_key(struct crypto_ablkcipher * tfm,const u8 * key,unsigned int key_len)37 int ablk_set_key(struct crypto_ablkcipher *tfm, const u8 *key,
38 unsigned int key_len)
39 {
40 struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm);
41 struct crypto_ablkcipher *child = &ctx->cryptd_tfm->base;
42 int err;
43
44 crypto_ablkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
45 crypto_ablkcipher_set_flags(child, crypto_ablkcipher_get_flags(tfm)
46 & CRYPTO_TFM_REQ_MASK);
47 err = crypto_ablkcipher_setkey(child, key, key_len);
48 crypto_ablkcipher_set_flags(tfm, crypto_ablkcipher_get_flags(child)
49 & CRYPTO_TFM_RES_MASK);
50 return err;
51 }
52 EXPORT_SYMBOL_GPL(ablk_set_key);
53
__ablk_encrypt(struct ablkcipher_request * req)54 int __ablk_encrypt(struct ablkcipher_request *req)
55 {
56 struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
57 struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm);
58 struct blkcipher_desc desc;
59
60 desc.tfm = cryptd_ablkcipher_child(ctx->cryptd_tfm);
61 desc.info = req->info;
62 desc.flags = 0;
63
64 return crypto_blkcipher_crt(desc.tfm)->encrypt(
65 &desc, req->dst, req->src, req->nbytes);
66 }
67 EXPORT_SYMBOL_GPL(__ablk_encrypt);
68
ablk_encrypt(struct ablkcipher_request * req)69 int ablk_encrypt(struct ablkcipher_request *req)
70 {
71 struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
72 struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm);
73
74 if (!may_use_simd() ||
75 (in_atomic() && cryptd_ablkcipher_queued(ctx->cryptd_tfm))) {
76 struct ablkcipher_request *cryptd_req =
77 ablkcipher_request_ctx(req);
78
79 *cryptd_req = *req;
80 ablkcipher_request_set_tfm(cryptd_req, &ctx->cryptd_tfm->base);
81
82 return crypto_ablkcipher_encrypt(cryptd_req);
83 } else {
84 return __ablk_encrypt(req);
85 }
86 }
87 EXPORT_SYMBOL_GPL(ablk_encrypt);
88
ablk_decrypt(struct ablkcipher_request * req)89 int ablk_decrypt(struct ablkcipher_request *req)
90 {
91 struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
92 struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm);
93
94 if (!may_use_simd() ||
95 (in_atomic() && cryptd_ablkcipher_queued(ctx->cryptd_tfm))) {
96 struct ablkcipher_request *cryptd_req =
97 ablkcipher_request_ctx(req);
98
99 *cryptd_req = *req;
100 ablkcipher_request_set_tfm(cryptd_req, &ctx->cryptd_tfm->base);
101
102 return crypto_ablkcipher_decrypt(cryptd_req);
103 } else {
104 struct blkcipher_desc desc;
105
106 desc.tfm = cryptd_ablkcipher_child(ctx->cryptd_tfm);
107 desc.info = req->info;
108 desc.flags = 0;
109
110 return crypto_blkcipher_crt(desc.tfm)->decrypt(
111 &desc, req->dst, req->src, req->nbytes);
112 }
113 }
114 EXPORT_SYMBOL_GPL(ablk_decrypt);
115
ablk_exit(struct crypto_tfm * tfm)116 void ablk_exit(struct crypto_tfm *tfm)
117 {
118 struct async_helper_ctx *ctx = crypto_tfm_ctx(tfm);
119
120 cryptd_free_ablkcipher(ctx->cryptd_tfm);
121 }
122 EXPORT_SYMBOL_GPL(ablk_exit);
123
ablk_init_common(struct crypto_tfm * tfm,const char * drv_name)124 int ablk_init_common(struct crypto_tfm *tfm, const char *drv_name)
125 {
126 struct async_helper_ctx *ctx = crypto_tfm_ctx(tfm);
127 struct cryptd_ablkcipher *cryptd_tfm;
128
129 cryptd_tfm = cryptd_alloc_ablkcipher(drv_name, CRYPTO_ALG_INTERNAL,
130 CRYPTO_ALG_INTERNAL);
131 if (IS_ERR(cryptd_tfm))
132 return PTR_ERR(cryptd_tfm);
133
134 ctx->cryptd_tfm = cryptd_tfm;
135 tfm->crt_ablkcipher.reqsize = sizeof(struct ablkcipher_request) +
136 crypto_ablkcipher_reqsize(&cryptd_tfm->base);
137
138 return 0;
139 }
140 EXPORT_SYMBOL_GPL(ablk_init_common);
141
ablk_init(struct crypto_tfm * tfm)142 int ablk_init(struct crypto_tfm *tfm)
143 {
144 char drv_name[CRYPTO_MAX_ALG_NAME];
145
146 snprintf(drv_name, sizeof(drv_name), "__driver-%s",
147 crypto_tfm_alg_driver_name(tfm));
148
149 return ablk_init_common(tfm, drv_name);
150 }
151 EXPORT_SYMBOL_GPL(ablk_init);
152
153 MODULE_LICENSE("GPL");
154