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Linux/crypto/ablk_helper.c

  1 /*
  2  * Shared async block cipher helpers
  3  *
  4  * Copyright (c) 2012 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
  5  *
  6  * Based on aesni-intel_glue.c by:
  7  *  Copyright (C) 2008, Intel Corp.
  8  *    Author: Huang Ying <ying.huang@intel.com>
  9  *
 10  * This program is free software; you can redistribute it and/or modify
 11  * it under the terms of the GNU General Public License as published by
 12  * the Free Software Foundation; either version 2 of the License, or
 13  * (at your option) any later version.
 14  *
 15  * This program is distributed in the hope that it will be useful,
 16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 18  * GNU General Public License for more details.
 19  *
 20  * You should have received a copy of the GNU General Public License
 21  * along with this program; if not, write to the Free Software
 22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 23  * USA
 24  *
 25  */
 26 
 27 #include <linux/kernel.h>
 28 #include <linux/crypto.h>
 29 #include <linux/init.h>
 30 #include <linux/module.h>
 31 #include <linux/hardirq.h>
 32 #include <crypto/algapi.h>
 33 #include <crypto/cryptd.h>
 34 #include <crypto/ablk_helper.h>
 35 #include <asm/simd.h>
 36 
 37 int ablk_set_key(struct crypto_ablkcipher *tfm, const u8 *key,
 38                  unsigned int key_len)
 39 {
 40         struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm);
 41         struct crypto_ablkcipher *child = &ctx->cryptd_tfm->base;
 42         int err;
 43 
 44         crypto_ablkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 45         crypto_ablkcipher_set_flags(child, crypto_ablkcipher_get_flags(tfm)
 46                                     & CRYPTO_TFM_REQ_MASK);
 47         err = crypto_ablkcipher_setkey(child, key, key_len);
 48         crypto_ablkcipher_set_flags(tfm, crypto_ablkcipher_get_flags(child)
 49                                     & CRYPTO_TFM_RES_MASK);
 50         return err;
 51 }
 52 EXPORT_SYMBOL_GPL(ablk_set_key);
 53 
 54 int __ablk_encrypt(struct ablkcipher_request *req)
 55 {
 56         struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
 57         struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm);
 58         struct blkcipher_desc desc;
 59 
 60         desc.tfm = cryptd_ablkcipher_child(ctx->cryptd_tfm);
 61         desc.info = req->info;
 62         desc.flags = 0;
 63 
 64         return crypto_blkcipher_crt(desc.tfm)->encrypt(
 65                 &desc, req->dst, req->src, req->nbytes);
 66 }
 67 EXPORT_SYMBOL_GPL(__ablk_encrypt);
 68 
 69 int ablk_encrypt(struct ablkcipher_request *req)
 70 {
 71         struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
 72         struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm);
 73 
 74         if (!may_use_simd() ||
 75             (in_atomic() && cryptd_ablkcipher_queued(ctx->cryptd_tfm))) {
 76                 struct ablkcipher_request *cryptd_req =
 77                         ablkcipher_request_ctx(req);
 78 
 79                 *cryptd_req = *req;
 80                 ablkcipher_request_set_tfm(cryptd_req, &ctx->cryptd_tfm->base);
 81 
 82                 return crypto_ablkcipher_encrypt(cryptd_req);
 83         } else {
 84                 return __ablk_encrypt(req);
 85         }
 86 }
 87 EXPORT_SYMBOL_GPL(ablk_encrypt);
 88 
 89 int ablk_decrypt(struct ablkcipher_request *req)
 90 {
 91         struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
 92         struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm);
 93 
 94         if (!may_use_simd() ||
 95             (in_atomic() && cryptd_ablkcipher_queued(ctx->cryptd_tfm))) {
 96                 struct ablkcipher_request *cryptd_req =
 97                         ablkcipher_request_ctx(req);
 98 
 99                 *cryptd_req = *req;
100                 ablkcipher_request_set_tfm(cryptd_req, &ctx->cryptd_tfm->base);
101 
102                 return crypto_ablkcipher_decrypt(cryptd_req);
103         } else {
104                 struct blkcipher_desc desc;
105 
106                 desc.tfm = cryptd_ablkcipher_child(ctx->cryptd_tfm);
107                 desc.info = req->info;
108                 desc.flags = 0;
109 
110                 return crypto_blkcipher_crt(desc.tfm)->decrypt(
111                         &desc, req->dst, req->src, req->nbytes);
112         }
113 }
114 EXPORT_SYMBOL_GPL(ablk_decrypt);
115 
116 void ablk_exit(struct crypto_tfm *tfm)
117 {
118         struct async_helper_ctx *ctx = crypto_tfm_ctx(tfm);
119 
120         cryptd_free_ablkcipher(ctx->cryptd_tfm);
121 }
122 EXPORT_SYMBOL_GPL(ablk_exit);
123 
124 int ablk_init_common(struct crypto_tfm *tfm, const char *drv_name)
125 {
126         struct async_helper_ctx *ctx = crypto_tfm_ctx(tfm);
127         struct cryptd_ablkcipher *cryptd_tfm;
128 
129         cryptd_tfm = cryptd_alloc_ablkcipher(drv_name, CRYPTO_ALG_INTERNAL,
130                                              CRYPTO_ALG_INTERNAL);
131         if (IS_ERR(cryptd_tfm))
132                 return PTR_ERR(cryptd_tfm);
133 
134         ctx->cryptd_tfm = cryptd_tfm;
135         tfm->crt_ablkcipher.reqsize = sizeof(struct ablkcipher_request) +
136                 crypto_ablkcipher_reqsize(&cryptd_tfm->base);
137 
138         return 0;
139 }
140 EXPORT_SYMBOL_GPL(ablk_init_common);
141 
142 int ablk_init(struct crypto_tfm *tfm)
143 {
144         char drv_name[CRYPTO_MAX_ALG_NAME];
145 
146         snprintf(drv_name, sizeof(drv_name), "__driver-%s",
147                                         crypto_tfm_alg_driver_name(tfm));
148 
149         return ablk_init_common(tfm, drv_name);
150 }
151 EXPORT_SYMBOL_GPL(ablk_init);
152 
153 MODULE_LICENSE("GPL");
154 

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