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Chanho Min0ea85302013-07-08 16:01:51 -07001/*
2 * Cryptographic API.
3 *
4 * Copyright (c) 2013 Chanho Min <chanho.min@lge.com>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published by
8 * the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc., 51
17 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 */
20#include <linux/init.h>
21#include <linux/module.h>
22#include <linux/crypto.h>
23#include <linux/vmalloc.h>
24#include <linux/lz4.h>
Giovanni Cabiddu91d53d92016-10-21 13:19:51 +010025#include <crypto/internal/scompress.h>
Chanho Min0ea85302013-07-08 16:01:51 -070026
27struct lz4hc_ctx {
28 void *lz4hc_comp_mem;
29};
30
Giovanni Cabiddu91d53d92016-10-21 13:19:51 +010031static void *lz4hc_alloc_ctx(struct crypto_scomp *tfm)
32{
33 void *ctx;
34
35 ctx = vmalloc(LZ4HC_MEM_COMPRESS);
36 if (!ctx)
37 return ERR_PTR(-ENOMEM);
38
39 return ctx;
40}
41
Chanho Min0ea85302013-07-08 16:01:51 -070042static int lz4hc_init(struct crypto_tfm *tfm)
43{
44 struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
45
Giovanni Cabiddu91d53d92016-10-21 13:19:51 +010046 ctx->lz4hc_comp_mem = lz4hc_alloc_ctx(NULL);
47 if (IS_ERR(ctx->lz4hc_comp_mem))
Chanho Min0ea85302013-07-08 16:01:51 -070048 return -ENOMEM;
49
50 return 0;
51}
52
Giovanni Cabiddu91d53d92016-10-21 13:19:51 +010053static void lz4hc_free_ctx(struct crypto_scomp *tfm, void *ctx)
54{
55 vfree(ctx);
56}
57
Chanho Min0ea85302013-07-08 16:01:51 -070058static void lz4hc_exit(struct crypto_tfm *tfm)
59{
60 struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
61
Giovanni Cabiddu91d53d92016-10-21 13:19:51 +010062 lz4hc_free_ctx(NULL, ctx->lz4hc_comp_mem);
Chanho Min0ea85302013-07-08 16:01:51 -070063}
64
Giovanni Cabiddu91d53d92016-10-21 13:19:51 +010065static int __lz4hc_compress_crypto(const u8 *src, unsigned int slen,
66 u8 *dst, unsigned int *dlen, void *ctx)
Chanho Min0ea85302013-07-08 16:01:51 -070067{
Chanho Min0ea85302013-07-08 16:01:51 -070068 size_t tmp_len = *dlen;
69 int err;
70
Giovanni Cabiddu91d53d92016-10-21 13:19:51 +010071 err = lz4hc_compress(src, slen, dst, &tmp_len, ctx);
Chanho Min0ea85302013-07-08 16:01:51 -070072
73 if (err < 0)
74 return -EINVAL;
75
76 *dlen = tmp_len;
77 return 0;
78}
79
Giovanni Cabiddu91d53d92016-10-21 13:19:51 +010080static int lz4hc_scompress(struct crypto_scomp *tfm, const u8 *src,
81 unsigned int slen, u8 *dst, unsigned int *dlen,
82 void *ctx)
83{
84 return __lz4hc_compress_crypto(src, slen, dst, dlen, ctx);
85}
86
87static int lz4hc_compress_crypto(struct crypto_tfm *tfm, const u8 *src,
88 unsigned int slen, u8 *dst,
89 unsigned int *dlen)
90{
91 struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
92
93 return __lz4hc_compress_crypto(src, slen, dst, dlen,
94 ctx->lz4hc_comp_mem);
95}
96
97static int __lz4hc_decompress_crypto(const u8 *src, unsigned int slen,
98 u8 *dst, unsigned int *dlen, void *ctx)
Chanho Min0ea85302013-07-08 16:01:51 -070099{
100 int err;
101 size_t tmp_len = *dlen;
102 size_t __slen = slen;
103
KOVACS Krisztiand801ab22014-08-22 10:44:35 +0200104 err = lz4_decompress_unknownoutputsize(src, __slen, dst, &tmp_len);
Chanho Min0ea85302013-07-08 16:01:51 -0700105 if (err < 0)
106 return -EINVAL;
107
108 *dlen = tmp_len;
109 return err;
110}
111
Giovanni Cabiddu91d53d92016-10-21 13:19:51 +0100112static int lz4hc_sdecompress(struct crypto_scomp *tfm, const u8 *src,
113 unsigned int slen, u8 *dst, unsigned int *dlen,
114 void *ctx)
115{
116 return __lz4hc_decompress_crypto(src, slen, dst, dlen, NULL);
117}
118
119static int lz4hc_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
120 unsigned int slen, u8 *dst,
121 unsigned int *dlen)
122{
123 return __lz4hc_decompress_crypto(src, slen, dst, dlen, NULL);
124}
125
Chanho Min0ea85302013-07-08 16:01:51 -0700126static struct crypto_alg alg_lz4hc = {
127 .cra_name = "lz4hc",
128 .cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
129 .cra_ctxsize = sizeof(struct lz4hc_ctx),
130 .cra_module = THIS_MODULE,
131 .cra_list = LIST_HEAD_INIT(alg_lz4hc.cra_list),
132 .cra_init = lz4hc_init,
133 .cra_exit = lz4hc_exit,
134 .cra_u = { .compress = {
135 .coa_compress = lz4hc_compress_crypto,
136 .coa_decompress = lz4hc_decompress_crypto } }
137};
138
Giovanni Cabiddu91d53d92016-10-21 13:19:51 +0100139static struct scomp_alg scomp = {
140 .alloc_ctx = lz4hc_alloc_ctx,
141 .free_ctx = lz4hc_free_ctx,
142 .compress = lz4hc_scompress,
143 .decompress = lz4hc_sdecompress,
144 .base = {
145 .cra_name = "lz4hc",
146 .cra_driver_name = "lz4hc-scomp",
147 .cra_module = THIS_MODULE,
148 }
149};
150
Chanho Min0ea85302013-07-08 16:01:51 -0700151static int __init lz4hc_mod_init(void)
152{
Giovanni Cabiddu91d53d92016-10-21 13:19:51 +0100153 int ret;
154
155 ret = crypto_register_alg(&alg_lz4hc);
156 if (ret)
157 return ret;
158
159 ret = crypto_register_scomp(&scomp);
160 if (ret) {
161 crypto_unregister_alg(&alg_lz4hc);
162 return ret;
163 }
164
165 return ret;
Chanho Min0ea85302013-07-08 16:01:51 -0700166}
167
168static void __exit lz4hc_mod_fini(void)
169{
170 crypto_unregister_alg(&alg_lz4hc);
Giovanni Cabiddu91d53d92016-10-21 13:19:51 +0100171 crypto_unregister_scomp(&scomp);
Chanho Min0ea85302013-07-08 16:01:51 -0700172}
173
174module_init(lz4hc_mod_init);
175module_exit(lz4hc_mod_fini);
176
177MODULE_LICENSE("GPL");
178MODULE_DESCRIPTION("LZ4HC Compression Algorithm");
Kees Cook5d26a102014-11-20 17:05:53 -0800179MODULE_ALIAS_CRYPTO("lz4hc");