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");
152