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		struct ablkcipher_request *cryptd_req =
 76			ablkcipher_request_ctx(req);
 77
 78		*cryptd_req = *req;
 79		ablkcipher_request_set_tfm(cryptd_req, &ctx->cryptd_tfm->base);
 80
 81		return crypto_ablkcipher_encrypt(cryptd_req);
 82	} else {
 83		return __ablk_encrypt(req);
 84	}
 85}
 86EXPORT_SYMBOL_GPL(ablk_encrypt);
 87
 88int ablk_decrypt(struct ablkcipher_request *req)
 89{
 90	struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
 91	struct async_helper_ctx *ctx = crypto_ablkcipher_ctx(tfm);
 92
 93	if (!may_use_simd()) {
 94		struct ablkcipher_request *cryptd_req =
 95			ablkcipher_request_ctx(req);
 96
 97		*cryptd_req = *req;
 98		ablkcipher_request_set_tfm(cryptd_req, &ctx->cryptd_tfm->base);
 99
100		return crypto_ablkcipher_decrypt(cryptd_req);
101	} else {
102		struct blkcipher_desc desc;
103
104		desc.tfm = cryptd_ablkcipher_child(ctx->cryptd_tfm);
105		desc.info = req->info;
106		desc.flags = 0;
107
108		return crypto_blkcipher_crt(desc.tfm)->decrypt(
109			&desc, req->dst, req->src, req->nbytes);
110	}
111}
112EXPORT_SYMBOL_GPL(ablk_decrypt);
113
114void ablk_exit(struct crypto_tfm *tfm)
115{
116	struct async_helper_ctx *ctx = crypto_tfm_ctx(tfm);
117
118	cryptd_free_ablkcipher(ctx->cryptd_tfm);
119}
120EXPORT_SYMBOL_GPL(ablk_exit);
121
122int ablk_init_common(struct crypto_tfm *tfm, const char *drv_name)
123{
124	struct async_helper_ctx *ctx = crypto_tfm_ctx(tfm);
125	struct cryptd_ablkcipher *cryptd_tfm;
126
127	cryptd_tfm = cryptd_alloc_ablkcipher(drv_name, CRYPTO_ALG_INTERNAL,
128					     CRYPTO_ALG_INTERNAL);
129	if (IS_ERR(cryptd_tfm))
130		return PTR_ERR(cryptd_tfm);
131
132	ctx->cryptd_tfm = cryptd_tfm;
133	tfm->crt_ablkcipher.reqsize = sizeof(struct ablkcipher_request) +
134		crypto_ablkcipher_reqsize(&cryptd_tfm->base);
135
136	return 0;
137}
138EXPORT_SYMBOL_GPL(ablk_init_common);
139
140int ablk_init(struct crypto_tfm *tfm)
141{
142	char drv_name[CRYPTO_MAX_ALG_NAME];
143
144	snprintf(drv_name, sizeof(drv_name), "__driver-%s",
145					crypto_tfm_alg_driver_name(tfm));
146
147	return ablk_init_common(tfm, drv_name);
148}
149EXPORT_SYMBOL_GPL(ablk_init);
150
151MODULE_LICENSE("GPL");