Root/crypto/ablk_helper.c

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, 0, 0);
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}
137EXPORT_SYMBOL_GPL(ablk_init_common);
138
139int 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}
148EXPORT_SYMBOL_GPL(ablk_init);
149
150MODULE_LICENSE("GPL");
151

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