1 /*
2 * Shared crypto simd helpers
3 *
4 * Copyright (c) 2012 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
5 * Copyright (c) 2016 Herbert Xu <herbert@gondor.apana.org.au>
6 *
7 * Based on aesni-intel_glue.c by:
8 * Copyright (C) 2008, Intel Corp.
9 * Author: Huang Ying <ying.huang@intel.com>
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, see <http://www.gnu.org/licenses/>.
23 *
24 */
25
26 #include <crypto/cryptd.h>
27 #include <crypto/internal/simd.h>
28 #include <crypto/internal/skcipher.h>
29 #include <linux/kernel.h>
30 #include <linux/module.h>
31 #include <linux/preempt.h>
32 #include <asm/simd.h>
33
34 struct simd_skcipher_alg {
35 const char *ialg_name;
36 struct skcipher_alg alg;
37 };
38
39 struct simd_skcipher_ctx {
40 struct cryptd_skcipher *cryptd_tfm;
41 };
42
simd_skcipher_setkey(struct crypto_skcipher * tfm,const u8 * key,unsigned int key_len)43 static int simd_skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key,
44 unsigned int key_len)
45 {
46 struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
47 struct crypto_skcipher *child = &ctx->cryptd_tfm->base;
48 int err;
49
50 crypto_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
51 crypto_skcipher_set_flags(child, crypto_skcipher_get_flags(tfm) &
52 CRYPTO_TFM_REQ_MASK);
53 err = crypto_skcipher_setkey(child, key, key_len);
54 crypto_skcipher_set_flags(tfm, crypto_skcipher_get_flags(child) &
55 CRYPTO_TFM_RES_MASK);
56 return err;
57 }
58
simd_skcipher_encrypt(struct skcipher_request * req)59 static int simd_skcipher_encrypt(struct skcipher_request *req)
60 {
61 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
62 struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
63 struct skcipher_request *subreq;
64 struct crypto_skcipher *child;
65
66 subreq = skcipher_request_ctx(req);
67 *subreq = *req;
68
69 if (!may_use_simd() ||
70 (in_atomic() && cryptd_skcipher_queued(ctx->cryptd_tfm)))
71 child = &ctx->cryptd_tfm->base;
72 else
73 child = cryptd_skcipher_child(ctx->cryptd_tfm);
74
75 skcipher_request_set_tfm(subreq, child);
76
77 return crypto_skcipher_encrypt(subreq);
78 }
79
simd_skcipher_decrypt(struct skcipher_request * req)80 static int simd_skcipher_decrypt(struct skcipher_request *req)
81 {
82 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
83 struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
84 struct skcipher_request *subreq;
85 struct crypto_skcipher *child;
86
87 subreq = skcipher_request_ctx(req);
88 *subreq = *req;
89
90 if (!may_use_simd() ||
91 (in_atomic() && cryptd_skcipher_queued(ctx->cryptd_tfm)))
92 child = &ctx->cryptd_tfm->base;
93 else
94 child = cryptd_skcipher_child(ctx->cryptd_tfm);
95
96 skcipher_request_set_tfm(subreq, child);
97
98 return crypto_skcipher_decrypt(subreq);
99 }
100
simd_skcipher_exit(struct crypto_skcipher * tfm)101 static void simd_skcipher_exit(struct crypto_skcipher *tfm)
102 {
103 struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
104
105 cryptd_free_skcipher(ctx->cryptd_tfm);
106 }
107
simd_skcipher_init(struct crypto_skcipher * tfm)108 static int simd_skcipher_init(struct crypto_skcipher *tfm)
109 {
110 struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
111 struct cryptd_skcipher *cryptd_tfm;
112 struct simd_skcipher_alg *salg;
113 struct skcipher_alg *alg;
114 unsigned reqsize;
115
116 alg = crypto_skcipher_alg(tfm);
117 salg = container_of(alg, struct simd_skcipher_alg, alg);
118
119 cryptd_tfm = cryptd_alloc_skcipher(salg->ialg_name,
120 CRYPTO_ALG_INTERNAL,
121 CRYPTO_ALG_INTERNAL);
122 if (IS_ERR(cryptd_tfm))
123 return PTR_ERR(cryptd_tfm);
124
125 ctx->cryptd_tfm = cryptd_tfm;
126
127 reqsize = crypto_skcipher_reqsize(cryptd_skcipher_child(cryptd_tfm));
128 reqsize = max(reqsize, crypto_skcipher_reqsize(&cryptd_tfm->base));
129 reqsize += sizeof(struct skcipher_request);
130
131 crypto_skcipher_set_reqsize(tfm, reqsize);
132
133 return 0;
134 }
135
simd_skcipher_create_compat(const char * algname,const char * drvname,const char * basename)136 struct simd_skcipher_alg *simd_skcipher_create_compat(const char *algname,
137 const char *drvname,
138 const char *basename)
139 {
140 struct simd_skcipher_alg *salg;
141 struct crypto_skcipher *tfm;
142 struct skcipher_alg *ialg;
143 struct skcipher_alg *alg;
144 int err;
145
146 tfm = crypto_alloc_skcipher(basename, CRYPTO_ALG_INTERNAL,
147 CRYPTO_ALG_INTERNAL | CRYPTO_ALG_ASYNC);
148 if (IS_ERR(tfm))
149 return ERR_CAST(tfm);
150
151 ialg = crypto_skcipher_alg(tfm);
152
153 salg = kzalloc(sizeof(*salg), GFP_KERNEL);
154 if (!salg) {
155 salg = ERR_PTR(-ENOMEM);
156 goto out_put_tfm;
157 }
158
159 salg->ialg_name = basename;
160 alg = &salg->alg;
161
162 err = -ENAMETOOLONG;
163 if (snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", algname) >=
164 CRYPTO_MAX_ALG_NAME)
165 goto out_free_salg;
166
167 if (snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
168 drvname) >= CRYPTO_MAX_ALG_NAME)
169 goto out_free_salg;
170
171 alg->base.cra_flags = CRYPTO_ALG_ASYNC;
172 alg->base.cra_priority = ialg->base.cra_priority;
173 alg->base.cra_blocksize = ialg->base.cra_blocksize;
174 alg->base.cra_alignmask = ialg->base.cra_alignmask;
175 alg->base.cra_module = ialg->base.cra_module;
176 alg->base.cra_ctxsize = sizeof(struct simd_skcipher_ctx);
177
178 alg->ivsize = ialg->ivsize;
179 alg->chunksize = ialg->chunksize;
180 alg->min_keysize = ialg->min_keysize;
181 alg->max_keysize = ialg->max_keysize;
182
183 alg->init = simd_skcipher_init;
184 alg->exit = simd_skcipher_exit;
185
186 alg->setkey = simd_skcipher_setkey;
187 alg->encrypt = simd_skcipher_encrypt;
188 alg->decrypt = simd_skcipher_decrypt;
189
190 err = crypto_register_skcipher(alg);
191 if (err)
192 goto out_free_salg;
193
194 out_put_tfm:
195 crypto_free_skcipher(tfm);
196 return salg;
197
198 out_free_salg:
199 kfree(salg);
200 salg = ERR_PTR(err);
201 goto out_put_tfm;
202 }
203 EXPORT_SYMBOL_GPL(simd_skcipher_create_compat);
204
simd_skcipher_create(const char * algname,const char * basename)205 struct simd_skcipher_alg *simd_skcipher_create(const char *algname,
206 const char *basename)
207 {
208 char drvname[CRYPTO_MAX_ALG_NAME];
209
210 if (snprintf(drvname, CRYPTO_MAX_ALG_NAME, "simd-%s", basename) >=
211 CRYPTO_MAX_ALG_NAME)
212 return ERR_PTR(-ENAMETOOLONG);
213
214 return simd_skcipher_create_compat(algname, drvname, basename);
215 }
216 EXPORT_SYMBOL_GPL(simd_skcipher_create);
217
simd_skcipher_free(struct simd_skcipher_alg * salg)218 void simd_skcipher_free(struct simd_skcipher_alg *salg)
219 {
220 crypto_unregister_skcipher(&salg->alg);
221 kfree(salg);
222 }
223 EXPORT_SYMBOL_GPL(simd_skcipher_free);
224
simd_register_skciphers_compat(struct skcipher_alg * algs,int count,struct simd_skcipher_alg ** simd_algs)225 int simd_register_skciphers_compat(struct skcipher_alg *algs, int count,
226 struct simd_skcipher_alg **simd_algs)
227 {
228 int err;
229 int i;
230 const char *algname;
231 const char *drvname;
232 const char *basename;
233 struct simd_skcipher_alg *simd;
234
235 err = crypto_register_skciphers(algs, count);
236 if (err)
237 return err;
238
239 for (i = 0; i < count; i++) {
240 WARN_ON(strncmp(algs[i].base.cra_name, "__", 2));
241 WARN_ON(strncmp(algs[i].base.cra_driver_name, "__", 2));
242 algname = algs[i].base.cra_name + 2;
243 drvname = algs[i].base.cra_driver_name + 2;
244 basename = algs[i].base.cra_driver_name;
245 simd = simd_skcipher_create_compat(algname, drvname, basename);
246 err = PTR_ERR(simd);
247 if (IS_ERR(simd))
248 goto err_unregister;
249 simd_algs[i] = simd;
250 }
251 return 0;
252
253 err_unregister:
254 simd_unregister_skciphers(algs, count, simd_algs);
255 return err;
256 }
257 EXPORT_SYMBOL_GPL(simd_register_skciphers_compat);
258
simd_unregister_skciphers(struct skcipher_alg * algs,int count,struct simd_skcipher_alg ** simd_algs)259 void simd_unregister_skciphers(struct skcipher_alg *algs, int count,
260 struct simd_skcipher_alg **simd_algs)
261 {
262 int i;
263
264 crypto_unregister_skciphers(algs, count);
265
266 for (i = 0; i < count; i++) {
267 if (simd_algs[i]) {
268 simd_skcipher_free(simd_algs[i]);
269 simd_algs[i] = NULL;
270 }
271 }
272 }
273 EXPORT_SYMBOL_GPL(simd_unregister_skciphers);
274
275 MODULE_LICENSE("GPL");
276