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1/*
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>
25
26struct lz4hc_ctx {
27 void *lz4hc_comp_mem;
28};
29
30static int lz4hc_init(struct crypto_tfm *tfm)
31{
32 struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
33
34 ctx->lz4hc_comp_mem = vmalloc(LZ4HC_MEM_COMPRESS);
35 if (!ctx->lz4hc_comp_mem)
36 return -ENOMEM;
37
38 return 0;
39}
40
41static void lz4hc_exit(struct crypto_tfm *tfm)
42{
43 struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
44
45 vfree(ctx->lz4hc_comp_mem);
46}
47
48static int lz4hc_compress_crypto(struct crypto_tfm *tfm, const u8 *src,
49 unsigned int slen, u8 *dst, unsigned int *dlen)
50{
51 struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
52 size_t tmp_len = *dlen;
53 int err;
54
55 err = lz4hc_compress(src, slen, dst, &tmp_len, ctx->lz4hc_comp_mem);
56
57 if (err < 0)
58 return -EINVAL;
59
60 *dlen = tmp_len;
61 return 0;
62}
63
64static int lz4hc_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
65 unsigned int slen, u8 *dst, unsigned int *dlen)
66{
67 int err;
68 size_t tmp_len = *dlen;
69 size_t __slen = slen;
70
71 err = lz4_decompress_unknownoutputsize(src, __slen, dst, &tmp_len);
72 if (err < 0)
73 return -EINVAL;
74
75 *dlen = tmp_len;
76 return err;
77}
78
79static struct crypto_alg alg_lz4hc = {
80 .cra_name = "lz4hc",
81 .cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
82 .cra_ctxsize = sizeof(struct lz4hc_ctx),
83 .cra_module = THIS_MODULE,
84 .cra_list = LIST_HEAD_INIT(alg_lz4hc.cra_list),
85 .cra_init = lz4hc_init,
86 .cra_exit = lz4hc_exit,
87 .cra_u = { .compress = {
88 .coa_compress = lz4hc_compress_crypto,
89 .coa_decompress = lz4hc_decompress_crypto } }
90};
91
92static int __init lz4hc_mod_init(void)
93{
94 return crypto_register_alg(&alg_lz4hc);
95}
96
97static void __exit lz4hc_mod_fini(void)
98{
99 crypto_unregister_alg(&alg_lz4hc);
100}
101
102module_init(lz4hc_mod_init);
103module_exit(lz4hc_mod_fini);
104
105MODULE_LICENSE("GPL");
106MODULE_DESCRIPTION("LZ4HC Compression Algorithm");
107MODULE_ALIAS_CRYPTO("lz4hc");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Cryptographic API.
4 *
5 * Copyright (c) 2013 Chanho Min <chanho.min@lge.com>
6 */
7#include <linux/init.h>
8#include <linux/module.h>
9#include <linux/crypto.h>
10#include <linux/vmalloc.h>
11#include <linux/lz4.h>
12#include <crypto/internal/scompress.h>
13
14struct lz4hc_ctx {
15 void *lz4hc_comp_mem;
16};
17
18static void *lz4hc_alloc_ctx(struct crypto_scomp *tfm)
19{
20 void *ctx;
21
22 ctx = vmalloc(LZ4HC_MEM_COMPRESS);
23 if (!ctx)
24 return ERR_PTR(-ENOMEM);
25
26 return ctx;
27}
28
29static int lz4hc_init(struct crypto_tfm *tfm)
30{
31 struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
32
33 ctx->lz4hc_comp_mem = lz4hc_alloc_ctx(NULL);
34 if (IS_ERR(ctx->lz4hc_comp_mem))
35 return -ENOMEM;
36
37 return 0;
38}
39
40static void lz4hc_free_ctx(struct crypto_scomp *tfm, void *ctx)
41{
42 vfree(ctx);
43}
44
45static void lz4hc_exit(struct crypto_tfm *tfm)
46{
47 struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
48
49 lz4hc_free_ctx(NULL, ctx->lz4hc_comp_mem);
50}
51
52static int __lz4hc_compress_crypto(const u8 *src, unsigned int slen,
53 u8 *dst, unsigned int *dlen, void *ctx)
54{
55 int out_len = LZ4_compress_HC(src, dst, slen,
56 *dlen, LZ4HC_DEFAULT_CLEVEL, ctx);
57
58 if (!out_len)
59 return -EINVAL;
60
61 *dlen = out_len;
62 return 0;
63}
64
65static int lz4hc_scompress(struct crypto_scomp *tfm, const u8 *src,
66 unsigned int slen, u8 *dst, unsigned int *dlen,
67 void *ctx)
68{
69 return __lz4hc_compress_crypto(src, slen, dst, dlen, ctx);
70}
71
72static int lz4hc_compress_crypto(struct crypto_tfm *tfm, const u8 *src,
73 unsigned int slen, u8 *dst,
74 unsigned int *dlen)
75{
76 struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
77
78 return __lz4hc_compress_crypto(src, slen, dst, dlen,
79 ctx->lz4hc_comp_mem);
80}
81
82static int __lz4hc_decompress_crypto(const u8 *src, unsigned int slen,
83 u8 *dst, unsigned int *dlen, void *ctx)
84{
85 int out_len = LZ4_decompress_safe(src, dst, slen, *dlen);
86
87 if (out_len < 0)
88 return -EINVAL;
89
90 *dlen = out_len;
91 return 0;
92}
93
94static int lz4hc_sdecompress(struct crypto_scomp *tfm, const u8 *src,
95 unsigned int slen, u8 *dst, unsigned int *dlen,
96 void *ctx)
97{
98 return __lz4hc_decompress_crypto(src, slen, dst, dlen, NULL);
99}
100
101static int lz4hc_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
102 unsigned int slen, u8 *dst,
103 unsigned int *dlen)
104{
105 return __lz4hc_decompress_crypto(src, slen, dst, dlen, NULL);
106}
107
108static struct crypto_alg alg_lz4hc = {
109 .cra_name = "lz4hc",
110 .cra_driver_name = "lz4hc-generic",
111 .cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
112 .cra_ctxsize = sizeof(struct lz4hc_ctx),
113 .cra_module = THIS_MODULE,
114 .cra_init = lz4hc_init,
115 .cra_exit = lz4hc_exit,
116 .cra_u = { .compress = {
117 .coa_compress = lz4hc_compress_crypto,
118 .coa_decompress = lz4hc_decompress_crypto } }
119};
120
121static struct scomp_alg scomp = {
122 .alloc_ctx = lz4hc_alloc_ctx,
123 .free_ctx = lz4hc_free_ctx,
124 .compress = lz4hc_scompress,
125 .decompress = lz4hc_sdecompress,
126 .base = {
127 .cra_name = "lz4hc",
128 .cra_driver_name = "lz4hc-scomp",
129 .cra_module = THIS_MODULE,
130 }
131};
132
133static int __init lz4hc_mod_init(void)
134{
135 int ret;
136
137 ret = crypto_register_alg(&alg_lz4hc);
138 if (ret)
139 return ret;
140
141 ret = crypto_register_scomp(&scomp);
142 if (ret) {
143 crypto_unregister_alg(&alg_lz4hc);
144 return ret;
145 }
146
147 return ret;
148}
149
150static void __exit lz4hc_mod_fini(void)
151{
152 crypto_unregister_alg(&alg_lz4hc);
153 crypto_unregister_scomp(&scomp);
154}
155
156subsys_initcall(lz4hc_mod_init);
157module_exit(lz4hc_mod_fini);
158
159MODULE_LICENSE("GPL");
160MODULE_DESCRIPTION("LZ4HC Compression Algorithm");
161MODULE_ALIAS_CRYPTO("lz4hc");