[linux.git] / crypto / ablk_helper.c

/*
 * Shared async block cipher helpers
 *
 * Copyright (c) 2012 Jussi Kivilinna <[email protected]>
 *
 * Based on aesni-intel_glue.c by:
 *  Copyright (C) 2008, Intel Corp.
 *    Author: Huang Ying <[email protected]>
 *
 * 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() ||
	    (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 <[email protected]>
	5	*
	6	* Based on aesni-intel_glue.c by:
	7	* Copyright (C) 2008, Intel Corp.
	8	* Author: Huang Ying <[email protected]>
	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
88407a39 HX	74	if (!may_use_simd() \|\|
88407a39 HX	75	(in_atomic() && cryptd_ablkcipher_queued(ctx->cryptd_tfm))) {
a62b01cd AB	76	struct ablkcipher_request *cryptd_req =
	77	ablkcipher_request_ctx(req);
	78
ea493d32	79	cryptd_req = req;
a62b01cd AB	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
88407a39 HX	94	if (!may_use_simd() \|\|
88407a39 HX	95	(in_atomic() && cryptd_ablkcipher_queued(ctx->cryptd_tfm))) {
a62b01cd AB	96	struct ablkcipher_request *cryptd_req =
	97	ablkcipher_request_ctx(req);
	98
ea493d32	99	cryptd_req = req;
a62b01cd AB	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
466a7b9e SM	129	cryptd_tfm = cryptd_alloc_ablkcipher(drv_name, CRYPTO_ALG_INTERNAL,
466a7b9e SM	130	CRYPTO_ALG_INTERNAL);
a62b01cd AB	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");