projects/linux·blob v4.13 · refs

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1/*
2 * Shared crypto simd helpers
3 *
4 * Copyright (c) 2012 Jussi Kivilinna <[email protected]>
5 * Copyright (c) 2016 Herbert Xu <[email protected]>
6 *
7 * Based on aesni-intel_glue.c by:
8 * Copyright (C) 2008, Intel Corp.
9 * Author: Huang Ying <[email protected]>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
24 * USA
25 *
26 */
27
28#include <crypto/cryptd.h>
29#include <crypto/internal/simd.h>
30#include <crypto/internal/skcipher.h>
31#include <linux/kernel.h>
32#include <linux/module.h>
33#include <linux/preempt.h>
34#include <asm/simd.h>
35
36struct simd_skcipher_alg {
37 const char *ialg_name;
38 struct skcipher_alg alg;
39};
40
41struct simd_skcipher_ctx {
42 struct cryptd_skcipher *cryptd_tfm;
43};
44
45static int simd_skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key,
46 unsigned int key_len)
47{
48 struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
49 struct crypto_skcipher *child = &ctx->cryptd_tfm->base;
50 int err;
51
52 crypto_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
53 crypto_skcipher_set_flags(child, crypto_skcipher_get_flags(tfm) &
54 CRYPTO_TFM_REQ_MASK);
55 err = crypto_skcipher_setkey(child, key, key_len);
56 crypto_skcipher_set_flags(tfm, crypto_skcipher_get_flags(child) &
57 CRYPTO_TFM_RES_MASK);
58 return err;
59}
60
61static int simd_skcipher_encrypt(struct skcipher_request *req)
62{
63 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
64 struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
65 struct skcipher_request *subreq;
66 struct crypto_skcipher *child;
67
68 subreq = skcipher_request_ctx(req);
69 *subreq = *req;
70
71 if (!may_use_simd() ||
72 (in_atomic() && cryptd_skcipher_queued(ctx->cryptd_tfm)))
73 child = &ctx->cryptd_tfm->base;
74 else
75 child = cryptd_skcipher_child(ctx->cryptd_tfm);
76
77 skcipher_request_set_tfm(subreq, child);
78
79 return crypto_skcipher_encrypt(subreq);
80}
81
82static int simd_skcipher_decrypt(struct skcipher_request *req)
83{
84 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
85 struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
86 struct skcipher_request *subreq;
87 struct crypto_skcipher *child;
88
89 subreq = skcipher_request_ctx(req);
90 *subreq = *req;
91
92 if (!may_use_simd() ||
93 (in_atomic() && cryptd_skcipher_queued(ctx->cryptd_tfm)))
94 child = &ctx->cryptd_tfm->base;
95 else
96 child = cryptd_skcipher_child(ctx->cryptd_tfm);
97
98 skcipher_request_set_tfm(subreq, child);
99
100 return crypto_skcipher_decrypt(subreq);
101}
102
103static void simd_skcipher_exit(struct crypto_skcipher *tfm)
104{
105 struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
106
107 cryptd_free_skcipher(ctx->cryptd_tfm);
108}
109
110static int simd_skcipher_init(struct crypto_skcipher *tfm)
111{
112 struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
113 struct cryptd_skcipher *cryptd_tfm;
114 struct simd_skcipher_alg *salg;
115 struct skcipher_alg *alg;
116 unsigned reqsize;
117
118 alg = crypto_skcipher_alg(tfm);
119 salg = container_of(alg, struct simd_skcipher_alg, alg);
120
121 cryptd_tfm = cryptd_alloc_skcipher(salg->ialg_name,
122 CRYPTO_ALG_INTERNAL,
123 CRYPTO_ALG_INTERNAL);
124 if (IS_ERR(cryptd_tfm))
125 return PTR_ERR(cryptd_tfm);
126
127 ctx->cryptd_tfm = cryptd_tfm;
128
129 reqsize = sizeof(struct skcipher_request);
130 reqsize += crypto_skcipher_reqsize(&cryptd_tfm->base);
131
132 crypto_skcipher_set_reqsize(tfm, reqsize);
133
134 return 0;
135}
136
137struct simd_skcipher_alg *simd_skcipher_create_compat(const char *algname,
138 const char *drvname,
139 const char *basename)
140{
141 struct simd_skcipher_alg *salg;
142 struct crypto_skcipher *tfm;
143 struct skcipher_alg *ialg;
144 struct skcipher_alg *alg;
145 int err;
146
147 tfm = crypto_alloc_skcipher(basename, CRYPTO_ALG_INTERNAL,
148 CRYPTO_ALG_INTERNAL | CRYPTO_ALG_ASYNC);
149 if (IS_ERR(tfm))
150 return ERR_CAST(tfm);
151
152 ialg = crypto_skcipher_alg(tfm);
153
154 salg = kzalloc(sizeof(*salg), GFP_KERNEL);
155 if (!salg) {
156 salg = ERR_PTR(-ENOMEM);
157 goto out_put_tfm;
158 }
159
160 salg->ialg_name = basename;
161 alg = &salg->alg;
162
163 err = -ENAMETOOLONG;
164 if (snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", algname) >=
165 CRYPTO_MAX_ALG_NAME)
166 goto out_free_salg;
167
168 if (snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
169 drvname) >= CRYPTO_MAX_ALG_NAME)
170 goto out_free_salg;
171
172 alg->base.cra_flags = CRYPTO_ALG_ASYNC;
173 alg->base.cra_priority = ialg->base.cra_priority;
174 alg->base.cra_blocksize = ialg->base.cra_blocksize;
175 alg->base.cra_alignmask = ialg->base.cra_alignmask;
176 alg->base.cra_module = ialg->base.cra_module;
177 alg->base.cra_ctxsize = sizeof(struct simd_skcipher_ctx);
178
179 alg->ivsize = ialg->ivsize;
180 alg->chunksize = ialg->chunksize;
181 alg->min_keysize = ialg->min_keysize;
182 alg->max_keysize = ialg->max_keysize;
183
184 alg->init = simd_skcipher_init;
185 alg->exit = simd_skcipher_exit;
186
187 alg->setkey = simd_skcipher_setkey;
188 alg->encrypt = simd_skcipher_encrypt;
189 alg->decrypt = simd_skcipher_decrypt;
190
191 err = crypto_register_skcipher(alg);
192 if (err)
193 goto out_free_salg;
194
195out_put_tfm:
196 crypto_free_skcipher(tfm);
197 return salg;
198
199out_free_salg:
200 kfree(salg);
201 salg = ERR_PTR(err);
202 goto out_put_tfm;
203}
204EXPORT_SYMBOL_GPL(simd_skcipher_create_compat);
205
206struct simd_skcipher_alg *simd_skcipher_create(const char *algname,
207 const char *basename)
208{
209 char drvname[CRYPTO_MAX_ALG_NAME];
210
211 if (snprintf(drvname, CRYPTO_MAX_ALG_NAME, "simd-%s", basename) >=
212 CRYPTO_MAX_ALG_NAME)
213 return ERR_PTR(-ENAMETOOLONG);
214
215 return simd_skcipher_create_compat(algname, drvname, basename);
216}
217EXPORT_SYMBOL_GPL(simd_skcipher_create);
218
219void simd_skcipher_free(struct simd_skcipher_alg *salg)
220{
221 crypto_unregister_skcipher(&salg->alg);
222 kfree(salg);
223}
224EXPORT_SYMBOL_GPL(simd_skcipher_free);
225
226MODULE_LICENSE("GPL");