[linux-2.6-block.git] / crypto / ablk_helper.c

/*
 * 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, see <http://www.gnu.org/licenses/>.
 *
 */

#include <linux/kernel.h>
#include <linux/crypto.h>
#include <linux/init.h>
#include <linux/module.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() ||
	    (in_atomic() && cryptd_ablkcipher_queued(ctx->cryptd_tfm))) {
		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() ||
	    (in_atomic() && cryptd_ablkcipher_queued(ctx->cryptd_tfm))) {
		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");
Commit	Line	Data
a62b01cd AB	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
1af39daa	21	* along with this program. If not, see <http://www.gnu.org/licenses/>.
a62b01cd AB	22	*
	23	*/
	24
	25	#include <linux/kernel.h>
	26	#include <linux/crypto.h>
	27	#include <linux/init.h>
	28	#include <linux/module.h>
a62b01cd AB	29	#include <crypto/algapi.h>
	30	#include <crypto/cryptd.h>
	31	#include <crypto/ablk_helper.h>
	32	#include <asm/simd.h>
	33
	34	int ablk_set_key(struct crypto_ablkcipher tfm, const u8 key,
	35	unsigned int key_len)
	36	{
	37	struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm);
	38	struct crypto_ablkcipher *child = &ctx->cryptd_tfm->base;
	39	int err;
	40
	41	crypto_ablkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
	42	crypto_ablkcipher_set_flags(child, crypto_ablkcipher_get_flags(tfm)
	43	& CRYPTO_TFM_REQ_MASK);
	44	err = crypto_ablkcipher_setkey(child, key, key_len);
	45	crypto_ablkcipher_set_flags(tfm, crypto_ablkcipher_get_flags(child)
	46	& CRYPTO_TFM_RES_MASK);
	47	return err;
	48	}
	49	EXPORT_SYMBOL_GPL(ablk_set_key);
	50
	51	int __ablk_encrypt(struct ablkcipher_request *req)
	52	{
	53	struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
	54	struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm);
	55	struct blkcipher_desc desc;
	56
	57	desc.tfm = cryptd_ablkcipher_child(ctx->cryptd_tfm);
	58	desc.info = req->info;
	59	desc.flags = 0;
	60
	61	return crypto_blkcipher_crt(desc.tfm)->encrypt(
	62	&desc, req->dst, req->src, req->nbytes);
	63	}
	64	EXPORT_SYMBOL_GPL(__ablk_encrypt);
	65
	66	int ablk_encrypt(struct ablkcipher_request *req)
	67	{
	68	struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
	69	struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm);
	70
88407a39 HX	71	if (!may_use_simd() \|\|
88407a39 HX	72	(in_atomic() && cryptd_ablkcipher_queued(ctx->cryptd_tfm))) {
a62b01cd AB	73	struct ablkcipher_request *cryptd_req =
	74	ablkcipher_request_ctx(req);
	75
ea493d32	76	cryptd_req = req;
a62b01cd AB	77	ablkcipher_request_set_tfm(cryptd_req, &ctx->cryptd_tfm->base);
	78
	79	return crypto_ablkcipher_encrypt(cryptd_req);
	80	} else {
	81	return __ablk_encrypt(req);
	82	}
	83	}
	84	EXPORT_SYMBOL_GPL(ablk_encrypt);
	85
	86	int ablk_decrypt(struct ablkcipher_request *req)
	87	{
	88	struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
	89	struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm);
	90
88407a39 HX	91	if (!may_use_simd() \|\|
88407a39 HX	92	(in_atomic() && cryptd_ablkcipher_queued(ctx->cryptd_tfm))) {
a62b01cd AB	93	struct ablkcipher_request *cryptd_req =
	94	ablkcipher_request_ctx(req);
	95
ea493d32	96	cryptd_req = req;
a62b01cd AB	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	}
	111	EXPORT_SYMBOL_GPL(ablk_decrypt);
	112
	113	void 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	}
	119	EXPORT_SYMBOL_GPL(ablk_exit);
	120
	121	int 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
466a7b9e SM	126	cryptd_tfm = cryptd_alloc_ablkcipher(drv_name, CRYPTO_ALG_INTERNAL,
466a7b9e SM	127	CRYPTO_ALG_INTERNAL);
a62b01cd AB	128	if (IS_ERR(cryptd_tfm))
	129	return PTR_ERR(cryptd_tfm);
	130
	131	ctx->cryptd_tfm = cryptd_tfm;
	132	tfm->crt_ablkcipher.reqsize = sizeof(struct ablkcipher_request) +
	133	crypto_ablkcipher_reqsize(&cryptd_tfm->base);
	134
	135	return 0;
	136	}
	137	EXPORT_SYMBOL_GPL(ablk_init_common);
	138
	139	int ablk_init(struct crypto_tfm *tfm)
	140	{
	141	char drv_name[CRYPTO_MAX_ALG_NAME];
	142
	143	snprintf(drv_name, sizeof(drv_name), "__driver-%s",
	144	crypto_tfm_alg_driver_name(tfm));
	145
	146	return ablk_init_common(tfm, drv_name);
	147	}
	148	EXPORT_SYMBOL_GPL(ablk_init);
	149
	150	MODULE_LICENSE("GPL");