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	    (in_atomic() && cryptd_ablkcipher_queued(ctx->cryptd_tfm))) {
 76		struct ablkcipher_request *cryptd_req =
 77			ablkcipher_request_ctx(req);
 78
 79		*cryptd_req = *req;
 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}
 87EXPORT_SYMBOL_GPL(ablk_encrypt);
 88
 89int 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
 94	if (!may_use_simd() ||
 95	    (in_atomic() && cryptd_ablkcipher_queued(ctx->cryptd_tfm))) {
 96		struct ablkcipher_request *cryptd_req =
 97			ablkcipher_request_ctx(req);
 98
 99		*cryptd_req = *req;
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}
114EXPORT_SYMBOL_GPL(ablk_decrypt);
115
116void 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}
122EXPORT_SYMBOL_GPL(ablk_exit);
123
124int 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
129	cryptd_tfm = cryptd_alloc_ablkcipher(drv_name, CRYPTO_ALG_INTERNAL,
130					     CRYPTO_ALG_INTERNAL);
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}
140EXPORT_SYMBOL_GPL(ablk_init_common);
141
142int 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}
151EXPORT_SYMBOL_GPL(ablk_init);
152
153MODULE_LICENSE("GPL");