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 = crypto_skcipher_reqsize(cryptd_skcipher_child(cryptd_tfm));
 130         reqsize = max(reqsize, crypto_skcipher_reqsize(&cryptd_tfm->base));
 131         reqsize += sizeof(struct skcipher_request);
 132
 133         crypto_skcipher_set_reqsize(tfm, reqsize);
 134
 135         return 0;
 136 }
 137
 138 struct simd_skcipher_alg *simd_skcipher_create_compat(const char *algname,
 139                                                       const char *drvname,
 140                                                       const char *basename)
 141 {
 142         struct simd_skcipher_alg *salg;
 143         struct crypto_skcipher *tfm;
 144         struct skcipher_alg *ialg;
 145         struct skcipher_alg *alg;
 146         int err;
 147
 148         tfm = crypto_alloc_skcipher(basename, CRYPTO_ALG_INTERNAL,
 149                                     CRYPTO_ALG_INTERNAL | CRYPTO_ALG_ASYNC);
 150         if (IS_ERR(tfm))
 151                 return ERR_CAST(tfm);
 152
 153         ialg = crypto_skcipher_alg(tfm);
 154
 155         salg = kzalloc(sizeof(*salg), GFP_KERNEL);
 156         if (!salg) {
 157                 salg = ERR_PTR(-ENOMEM);
 158                 goto out_put_tfm;
 159         }
 160
 161         salg->ialg_name = basename;
 162         alg = &salg->alg;
 163
 164         err = -ENAMETOOLONG;
 165         if (snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", algname) >=
 166             CRYPTO_MAX_ALG_NAME)
 167                 goto out_free_salg;
 168
 169         if (snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
 170                      drvname) >= CRYPTO_MAX_ALG_NAME)
 171                 goto out_free_salg;
 172
 173         alg->base.cra_flags = CRYPTO_ALG_ASYNC;
 174         alg->base.cra_priority = ialg->base.cra_priority;
 175         alg->base.cra_blocksize = ialg->base.cra_blocksize;
 176         alg->base.cra_alignmask = ialg->base.cra_alignmask;
 177         alg->base.cra_module = ialg->base.cra_module;
 178         alg->base.cra_ctxsize = sizeof(struct simd_skcipher_ctx);
 179
 180         alg->ivsize = ialg->ivsize;
 181         alg->chunksize = ialg->chunksize;
 182         alg->min_keysize = ialg->min_keysize;
 183         alg->max_keysize = ialg->max_keysize;
 184
 185         alg->init = simd_skcipher_init;
 186         alg->exit = simd_skcipher_exit;
 187
 188         alg->setkey = simd_skcipher_setkey;
 189         alg->encrypt = simd_skcipher_encrypt;
 190         alg->decrypt = simd_skcipher_decrypt;
 191
 192         err = crypto_register_skcipher(alg);
 193         if (err)
 194                 goto out_free_salg;
 195
 196 out_put_tfm:
 197         crypto_free_skcipher(tfm);
 198         return salg;
 199
 200 out_free_salg:
 201         kfree(salg);
 202         salg = ERR_PTR(err);
 203         goto out_put_tfm;
 204 }
 205 EXPORT_SYMBOL_GPL(simd_skcipher_create_compat);
 206
 207 struct simd_skcipher_alg *simd_skcipher_create(const char *algname,
 208                                                const char *basename)
 209 {
 210         char drvname[CRYPTO_MAX_ALG_NAME];
 211
 212         if (snprintf(drvname, CRYPTO_MAX_ALG_NAME, "simd-%s", basename) >=
 213             CRYPTO_MAX_ALG_NAME)
 214                 return ERR_PTR(-ENAMETOOLONG);
 215
 216         return simd_skcipher_create_compat(algname, drvname, basename);
 217 }
 218 EXPORT_SYMBOL_GPL(simd_skcipher_create);
 219
 220 void simd_skcipher_free(struct simd_skcipher_alg *salg)
 221 {
 222         crypto_unregister_skcipher(&salg->alg);
 223         kfree(salg);
 224 }
 225 EXPORT_SYMBOL_GPL(simd_skcipher_free);
 226
 227 MODULE_LICENSE("GPL");