LXR linux/arch/x86/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 <crypto/algapi.h>
  32#include <crypto/cryptd.h>
  33#include <asm/i387.h>
  34#include <asm/crypto/ablk_helper.h>
  35
  36int ablk_set_key(struct crypto_ablkcipher *tfm, const u8 *key,
  37                 unsigned int key_len)
  38{
  39        struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm);
  40        struct crypto_ablkcipher *child = &ctx->cryptd_tfm->base;
  41        int err;
  42
  43        crypto_ablkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
  44        crypto_ablkcipher_set_flags(child, crypto_ablkcipher_get_flags(tfm)
  45                                    & CRYPTO_TFM_REQ_MASK);
  46        err = crypto_ablkcipher_setkey(child, key, key_len);
  47        crypto_ablkcipher_set_flags(tfm, crypto_ablkcipher_get_flags(child)
  48                                    & CRYPTO_TFM_RES_MASK);
  49        return err;
  50}
  51EXPORT_SYMBOL_GPL(ablk_set_key);
  52
  53int __ablk_encrypt(struct ablkcipher_request *req)
  54{
  55        struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
  56        struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm);
  57        struct blkcipher_desc desc;
  58
  59        desc.tfm = cryptd_ablkcipher_child(ctx->cryptd_tfm);
  60        desc.info = req->info;
  61        desc.flags = 0;
  62
  63        return crypto_blkcipher_crt(desc.tfm)->encrypt(
  64                &desc, req->dst, req->src, req->nbytes);
  65}
  66EXPORT_SYMBOL_GPL(__ablk_encrypt);
  67
  68int ablk_encrypt(struct ablkcipher_request *req)
  69{
  70        struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
  71        struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm);
  72
  73        if (!irq_fpu_usable()) {
  74                struct ablkcipher_request *cryptd_req =
  75                        ablkcipher_request_ctx(req);
  76
  77                memcpy(cryptd_req, req, sizeof(*req));
  78                ablkcipher_request_set_tfm(cryptd_req, &ctx->cryptd_tfm->base);
  79
  80                return crypto_ablkcipher_encrypt(cryptd_req);
  81        } else {
  82                return __ablk_encrypt(req);
  83        }
  84}
  85EXPORT_SYMBOL_GPL(ablk_encrypt);
  86
  87int ablk_decrypt(struct ablkcipher_request *req)
  88{
  89        struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
  90        struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm);
  91
  92        if (!irq_fpu_usable()) {
  93                struct ablkcipher_request *cryptd_req =
  94                        ablkcipher_request_ctx(req);
  95
  96                memcpy(cryptd_req, req, sizeof(*req));
  97                ablkcipher_request_set_tfm(cryptd_req, &ctx->cryptd_tfm->base);
  98
  99                return crypto_ablkcipher_decrypt(cryptd_req);
 100        } else {
 101                struct blkcipher_desc desc;
 102
 103                desc.tfm = cryptd_ablkcipher_child(ctx->cryptd_tfm);
 104                desc.info = req->info;
 105                desc.flags = 0;
 106
 107                return crypto_blkcipher_crt(desc.tfm)->decrypt(
 108                        &desc, req->dst, req->src, req->nbytes);
 109        }
 110}
 111EXPORT_SYMBOL_GPL(ablk_decrypt);
 112
 113void ablk_exit(struct crypto_tfm *tfm)
 114{
 115        struct async_helper_ctx *ctx = crypto_tfm_ctx(tfm);
 116
 117        cryptd_free_ablkcipher(ctx->cryptd_tfm);
 118}
 119EXPORT_SYMBOL_GPL(ablk_exit);
 120
 121int ablk_init_common(struct crypto_tfm *tfm, const char *drv_name)
 122{
 123        struct async_helper_ctx *ctx = crypto_tfm_ctx(tfm);
 124        struct cryptd_ablkcipher *cryptd_tfm;
 125
 126        cryptd_tfm = cryptd_alloc_ablkcipher(drv_name, 0, 0);
 127        if (IS_ERR(cryptd_tfm))
 128                return PTR_ERR(cryptd_tfm);
 129
 130        ctx->cryptd_tfm = cryptd_tfm;
 131        tfm->crt_ablkcipher.reqsize = sizeof(struct ablkcipher_request) +
 132                crypto_ablkcipher_reqsize(&cryptd_tfm->base);
 133
 134        return 0;
 135}
 136EXPORT_SYMBOL_GPL(ablk_init_common);
 137
 138int ablk_init(struct crypto_tfm *tfm)
 139{
 140        char drv_name[CRYPTO_MAX_ALG_NAME];
 141
 142        snprintf(drv_name, sizeof(drv_name), "__driver-%s",
 143                                        crypto_tfm_alg_driver_name(tfm));
 144
 145        return ablk_init_common(tfm, drv_name);
 146}
 147EXPORT_SYMBOL_GPL(ablk_init);
 148
 149MODULE_LICENSE("GPL");
 150