Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

Linux/crypto/simd.c

  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, 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 
 36 struct simd_skcipher_alg {
 37         const char *ialg_name;
 38         struct skcipher_alg alg;
 39 };
 40 
 41 struct simd_skcipher_ctx {
 42         struct cryptd_skcipher *cryptd_tfm;
 43 };
 44 
 45 static 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 
 61 static 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 
 82 static 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 
103 static 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 
110 static 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 
137 struct 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 
195 out_put_tfm:
196         crypto_free_skcipher(tfm);
197         return salg;
198 
199 out_free_salg:
200         kfree(salg);
201         salg = ERR_PTR(err);
202         goto out_put_tfm;
203 }
204 EXPORT_SYMBOL_GPL(simd_skcipher_create_compat);
205 
206 struct 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 }
217 EXPORT_SYMBOL_GPL(simd_skcipher_create);
218 
219 void simd_skcipher_free(struct simd_skcipher_alg *salg)
220 {
221         crypto_unregister_skcipher(&salg->alg);
222         kfree(salg);
223 }
224 EXPORT_SYMBOL_GPL(simd_skcipher_free);
225 
226 MODULE_LICENSE("GPL");
227 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us