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TOMOYO Linux Cross Reference
Linux/crypto/simd.c

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  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 
 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 
 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 
 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 
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 
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 = sizeof(struct skcipher_request);
128         reqsize += crypto_skcipher_reqsize(&cryptd_tfm->base);
129 
130         crypto_skcipher_set_reqsize(tfm, reqsize);
131 
132         return 0;
133 }
134 
135 struct simd_skcipher_alg *simd_skcipher_create_compat(const char *algname,
136                                                       const char *drvname,
137                                                       const char *basename)
138 {
139         struct simd_skcipher_alg *salg;
140         struct crypto_skcipher *tfm;
141         struct skcipher_alg *ialg;
142         struct skcipher_alg *alg;
143         int err;
144 
145         tfm = crypto_alloc_skcipher(basename, CRYPTO_ALG_INTERNAL,
146                                     CRYPTO_ALG_INTERNAL | CRYPTO_ALG_ASYNC);
147         if (IS_ERR(tfm))
148                 return ERR_CAST(tfm);
149 
150         ialg = crypto_skcipher_alg(tfm);
151 
152         salg = kzalloc(sizeof(*salg), GFP_KERNEL);
153         if (!salg) {
154                 salg = ERR_PTR(-ENOMEM);
155                 goto out_put_tfm;
156         }
157 
158         salg->ialg_name = basename;
159         alg = &salg->alg;
160 
161         err = -ENAMETOOLONG;
162         if (snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", algname) >=
163             CRYPTO_MAX_ALG_NAME)
164                 goto out_free_salg;
165 
166         if (snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
167                      drvname) >= CRYPTO_MAX_ALG_NAME)
168                 goto out_free_salg;
169 
170         alg->base.cra_flags = CRYPTO_ALG_ASYNC;
171         alg->base.cra_priority = ialg->base.cra_priority;
172         alg->base.cra_blocksize = ialg->base.cra_blocksize;
173         alg->base.cra_alignmask = ialg->base.cra_alignmask;
174         alg->base.cra_module = ialg->base.cra_module;
175         alg->base.cra_ctxsize = sizeof(struct simd_skcipher_ctx);
176 
177         alg->ivsize = ialg->ivsize;
178         alg->chunksize = ialg->chunksize;
179         alg->min_keysize = ialg->min_keysize;
180         alg->max_keysize = ialg->max_keysize;
181 
182         alg->init = simd_skcipher_init;
183         alg->exit = simd_skcipher_exit;
184 
185         alg->setkey = simd_skcipher_setkey;
186         alg->encrypt = simd_skcipher_encrypt;
187         alg->decrypt = simd_skcipher_decrypt;
188 
189         err = crypto_register_skcipher(alg);
190         if (err)
191                 goto out_free_salg;
192 
193 out_put_tfm:
194         crypto_free_skcipher(tfm);
195         return salg;
196 
197 out_free_salg:
198         kfree(salg);
199         salg = ERR_PTR(err);
200         goto out_put_tfm;
201 }
202 EXPORT_SYMBOL_GPL(simd_skcipher_create_compat);
203 
204 struct simd_skcipher_alg *simd_skcipher_create(const char *algname,
205                                                const char *basename)
206 {
207         char drvname[CRYPTO_MAX_ALG_NAME];
208 
209         if (snprintf(drvname, CRYPTO_MAX_ALG_NAME, "simd-%s", basename) >=
210             CRYPTO_MAX_ALG_NAME)
211                 return ERR_PTR(-ENAMETOOLONG);
212 
213         return simd_skcipher_create_compat(algname, drvname, basename);
214 }
215 EXPORT_SYMBOL_GPL(simd_skcipher_create);
216 
217 void simd_skcipher_free(struct simd_skcipher_alg *salg)
218 {
219         crypto_unregister_skcipher(&salg->alg);
220         kfree(salg);
221 }
222 EXPORT_SYMBOL_GPL(simd_skcipher_free);
223 
224 int simd_register_skciphers_compat(struct skcipher_alg *algs, int count,
225                                    struct simd_skcipher_alg **simd_algs)
226 {
227         int err;
228         int i;
229         const char *algname;
230         const char *drvname;
231         const char *basename;
232         struct simd_skcipher_alg *simd;
233 
234         err = crypto_register_skciphers(algs, count);
235         if (err)
236                 return err;
237 
238         for (i = 0; i < count; i++) {
239                 WARN_ON(strncmp(algs[i].base.cra_name, "__", 2));
240                 WARN_ON(strncmp(algs[i].base.cra_driver_name, "__", 2));
241                 algname = algs[i].base.cra_name + 2;
242                 drvname = algs[i].base.cra_driver_name + 2;
243                 basename = algs[i].base.cra_driver_name;
244                 simd = simd_skcipher_create_compat(algname, drvname, basename);
245                 err = PTR_ERR(simd);
246                 if (IS_ERR(simd))
247                         goto err_unregister;
248                 simd_algs[i] = simd;
249         }
250         return 0;
251 
252 err_unregister:
253         simd_unregister_skciphers(algs, count, simd_algs);
254         return err;
255 }
256 EXPORT_SYMBOL_GPL(simd_register_skciphers_compat);
257 
258 void simd_unregister_skciphers(struct skcipher_alg *algs, int count,
259                                struct simd_skcipher_alg **simd_algs)
260 {
261         int i;
262 
263         crypto_unregister_skciphers(algs, count);
264 
265         for (i = 0; i < count; i++) {
266                 if (simd_algs[i]) {
267                         simd_skcipher_free(simd_algs[i]);
268                         simd_algs[i] = NULL;
269                 }
270         }
271 }
272 EXPORT_SYMBOL_GPL(simd_unregister_skciphers);
273 
274 MODULE_LICENSE("GPL");
275 

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