ablk_helper.c
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/*
* Shared async block cipher helpers
*
* Copyright (c) 2012 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
*
* Based on aesni-intel_glue.c by:
* Copyright (C) 2008, Intel Corp.
* Author: Huang Ying <ying.huang@intel.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
*/
#include <linux/kernel.h>
#include <linux/crypto.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/hardirq.h>
#include <crypto/algapi.h>
#include <crypto/cryptd.h>
#include <crypto/ablk_helper.h>
#include <asm/simd.h>
int ablk_set_key(struct crypto_ablkcipher *tfm, const u8 *key,
unsigned int key_len)
{
struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm);
struct crypto_ablkcipher *child = &ctx->cryptd_tfm->base;
int err;
crypto_ablkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
crypto_ablkcipher_set_flags(child, crypto_ablkcipher_get_flags(tfm)
& CRYPTO_TFM_REQ_MASK);
err = crypto_ablkcipher_setkey(child, key, key_len);
crypto_ablkcipher_set_flags(tfm, crypto_ablkcipher_get_flags(child)
& CRYPTO_TFM_RES_MASK);
return err;
}
EXPORT_SYMBOL_GPL(ablk_set_key);
int __ablk_encrypt(struct ablkcipher_request *req)
{
struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm);
struct blkcipher_desc desc;
desc.tfm = cryptd_ablkcipher_child(ctx->cryptd_tfm);
desc.info = req->info;
desc.flags = 0;
return crypto_blkcipher_crt(desc.tfm)->encrypt(
&desc, req->dst, req->src, req->nbytes);
}
EXPORT_SYMBOL_GPL(__ablk_encrypt);
int ablk_encrypt(struct ablkcipher_request *req)
{
struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm);
if (!may_use_simd()) {
struct ablkcipher_request *cryptd_req =
ablkcipher_request_ctx(req);
*cryptd_req = *req;
ablkcipher_request_set_tfm(cryptd_req, &ctx->cryptd_tfm->base);
return crypto_ablkcipher_encrypt(cryptd_req);
} else {
return __ablk_encrypt(req);
}
}
EXPORT_SYMBOL_GPL(ablk_encrypt);
int ablk_decrypt(struct ablkcipher_request *req)
{
struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm);
if (!may_use_simd()) {
struct ablkcipher_request *cryptd_req =
ablkcipher_request_ctx(req);
*cryptd_req = *req;
ablkcipher_request_set_tfm(cryptd_req, &ctx->cryptd_tfm->base);
return crypto_ablkcipher_decrypt(cryptd_req);
} else {
struct blkcipher_desc desc;
desc.tfm = cryptd_ablkcipher_child(ctx->cryptd_tfm);
desc.info = req->info;
desc.flags = 0;
return crypto_blkcipher_crt(desc.tfm)->decrypt(
&desc, req->dst, req->src, req->nbytes);
}
}
EXPORT_SYMBOL_GPL(ablk_decrypt);
void ablk_exit(struct crypto_tfm *tfm)
{
struct async_helper_ctx *ctx = crypto_tfm_ctx(tfm);
cryptd_free_ablkcipher(ctx->cryptd_tfm);
}
EXPORT_SYMBOL_GPL(ablk_exit);
int ablk_init_common(struct crypto_tfm *tfm, const char *drv_name)
{
struct async_helper_ctx *ctx = crypto_tfm_ctx(tfm);
struct cryptd_ablkcipher *cryptd_tfm;
cryptd_tfm = cryptd_alloc_ablkcipher(drv_name, CRYPTO_ALG_INTERNAL,
CRYPTO_ALG_INTERNAL);
if (IS_ERR(cryptd_tfm))
return PTR_ERR(cryptd_tfm);
ctx->cryptd_tfm = cryptd_tfm;
tfm->crt_ablkcipher.reqsize = sizeof(struct ablkcipher_request) +
crypto_ablkcipher_reqsize(&cryptd_tfm->base);
return 0;
}
EXPORT_SYMBOL_GPL(ablk_init_common);
int ablk_init(struct crypto_tfm *tfm)
{
char drv_name[CRYPTO_MAX_ALG_NAME];
snprintf(drv_name, sizeof(drv_name), "__driver-%s",
crypto_tfm_alg_driver_name(tfm));
return ablk_init_common(tfm, drv_name);
}
EXPORT_SYMBOL_GPL(ablk_init);
MODULE_LICENSE("GPL");