LXR linux/crypto/ablk

   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
  37int 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}
  52EXPORT_SYMBOL_GPL(ablk_set_key);
  53
  54int __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}
  67EXPORT_SYMBOL_GPL(__ablk_encrypt);
  68
  69int 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                struct ablkcipher_request *cryptd_req =
  76                        ablkcipher_request_ctx(req);
  77
  78                *cryptd_req = *req;
  79                ablkcipher_request_set_tfm(cryptd_req, &ctx->cryptd_tfm->base);
  80
  81                return crypto_ablkcipher_encrypt(cryptd_req);
  82        } else {
  83                return __ablk_encrypt(req);
  84        }
  85}
  86EXPORT_SYMBOL_GPL(ablk_encrypt);
  87
  88int ablk_decrypt(struct ablkcipher_request *req)
  89{
  90        struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
  91        struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm);
  92
  93        if (!may_use_simd()) {
  94                struct ablkcipher_request *cryptd_req =
  95                        ablkcipher_request_ctx(req);
  96
  97                *cryptd_req = *req;
  98                ablkcipher_request_set_tfm(cryptd_req, &ctx->cryptd_tfm->base);
  99
 100                return crypto_ablkcipher_decrypt(cryptd_req);
 101        } else {
 102                struct blkcipher_desc desc;
 103
 104                desc.tfm = cryptd_ablkcipher_child(ctx->cryptd_tfm);
 105                desc.info = req->info;
 106                desc.flags = 0;
 107
 108                return crypto_blkcipher_crt(desc.tfm)->decrypt(
 109                        &desc, req->dst, req->src, req->nbytes);
 110        }
 111}
 112EXPORT_SYMBOL_GPL(ablk_decrypt);
 113
 114void ablk_exit(struct crypto_tfm *tfm)
 115{
 116        struct async_helper_ctx *ctx = crypto_tfm_ctx(tfm);
 117
 118        cryptd_free_ablkcipher(ctx->cryptd_tfm);
 119}
 120EXPORT_SYMBOL_GPL(ablk_exit);
 121
 122int ablk_init_common(struct crypto_tfm *tfm, const char *drv_name)
 123{
 124        struct async_helper_ctx *ctx = crypto_tfm_ctx(tfm);
 125        struct cryptd_ablkcipher *cryptd_tfm;
 126
 127        cryptd_tfm = cryptd_alloc_ablkcipher(drv_name, CRYPTO_ALG_INTERNAL,
 128                                             CRYPTO_ALG_INTERNAL);
 129        if (IS_ERR(cryptd_tfm))
 130                return PTR_ERR(cryptd_tfm);
 131
 132        ctx->cryptd_tfm = cryptd_tfm;
 133        tfm->crt_ablkcipher.reqsize = sizeof(struct ablkcipher_request) +
 134                crypto_ablkcipher_reqsize(&cryptd_tfm->base);
 135
 136        return 0;
 137}
 138EXPORT_SYMBOL_GPL(ablk_init_common);
 139
 140int ablk_init(struct crypto_tfm *tfm)
 141{
 142        char drv_name[CRYPTO_MAX_ALG_NAME];
 143
 144        snprintf(drv_name, sizeof(drv_name), "__driver-%s",
 145                                        crypto_tfm_alg_driver_name(tfm));
 146
 147        return ablk_init_common(tfm, drv_name);
 148}
 149EXPORT_SYMBOL_GPL(ablk_init);
 150
 151MODULE_LICENSE("GPL");
 152