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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
8#include <linux/init.h>
9#include <linux/module.h>
10#include <linux/crypto.h>
11#include <linux/vmalloc.h>
12#include <linux/lz4.h>
13#include <crypto/internal/scompress.h>
14
15struct lz4_ctx {
16 void *lz4_comp_mem;
17};
18
19static void *lz4_alloc_ctx(struct crypto_scomp *tfm)
20{
21 void *ctx;
22
23 ctx = vmalloc(LZ4_MEM_COMPRESS);
24 if (!ctx)
25 return ERR_PTR(-ENOMEM);
26
27 return ctx;
28}
29
30static int lz4_init(struct crypto_tfm *tfm)
31{
32 struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
33
34 ctx->lz4_comp_mem = lz4_alloc_ctx(NULL);
35 if (IS_ERR(ctx->lz4_comp_mem))
36 return -ENOMEM;
37
38 return 0;
39}
40
41static void lz4_free_ctx(struct crypto_scomp *tfm, void *ctx)
42{
43 vfree(ctx);
44}
45
46static void lz4_exit(struct crypto_tfm *tfm)
47{
48 struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
49
50 lz4_free_ctx(NULL, ctx->lz4_comp_mem);
51}
52
53static int __lz4_compress_crypto(const u8 *src, unsigned int slen,
54 u8 *dst, unsigned int *dlen, void *ctx)
55{
56 int out_len = LZ4_compress_default(src, dst,
57 slen, *dlen, ctx);
58
59 if (!out_len)
60 return -EINVAL;
61
62 *dlen = out_len;
63 return 0;
64}
65
66static int lz4_scompress(struct crypto_scomp *tfm, const u8 *src,
67 unsigned int slen, u8 *dst, unsigned int *dlen,
68 void *ctx)
69{
70 return __lz4_compress_crypto(src, slen, dst, dlen, ctx);
71}
72
73static int lz4_compress_crypto(struct crypto_tfm *tfm, const u8 *src,
74 unsigned int slen, u8 *dst, unsigned int *dlen)
75{
76 struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
77
78 return __lz4_compress_crypto(src, slen, dst, dlen, ctx->lz4_comp_mem);
79}
80
81static int __lz4_decompress_crypto(const u8 *src, unsigned int slen,
82 u8 *dst, unsigned int *dlen, void *ctx)
83{
84 int out_len = LZ4_decompress_safe(src, dst, slen, *dlen);
85
86 if (out_len < 0)
87 return -EINVAL;
88
89 *dlen = out_len;
90 return 0;
91}
92
93static int lz4_sdecompress(struct crypto_scomp *tfm, const u8 *src,
94 unsigned int slen, u8 *dst, unsigned int *dlen,
95 void *ctx)
96{
97 return __lz4_decompress_crypto(src, slen, dst, dlen, NULL);
98}
99
100static int lz4_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
101 unsigned int slen, u8 *dst,
102 unsigned int *dlen)
103{
104 return __lz4_decompress_crypto(src, slen, dst, dlen, NULL);
105}
106
107static struct crypto_alg alg_lz4 = {
108 .cra_name = "lz4",
109 .cra_driver_name = "lz4-generic",
110 .cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
111 .cra_ctxsize = sizeof(struct lz4_ctx),
112 .cra_module = THIS_MODULE,
113 .cra_init = lz4_init,
114 .cra_exit = lz4_exit,
115 .cra_u = { .compress = {
116 .coa_compress = lz4_compress_crypto,
117 .coa_decompress = lz4_decompress_crypto } }
118};
119
120static struct scomp_alg scomp = {
121 .alloc_ctx = lz4_alloc_ctx,
122 .free_ctx = lz4_free_ctx,
123 .compress = lz4_scompress,
124 .decompress = lz4_sdecompress,
125 .base = {
126 .cra_name = "lz4",
127 .cra_driver_name = "lz4-scomp",
128 .cra_module = THIS_MODULE,
129 }
130};
131
132static int __init lz4_mod_init(void)
133{
134 int ret;
135
136 ret = crypto_register_alg(&alg_lz4);
137 if (ret)
138 return ret;
139
140 ret = crypto_register_scomp(&scomp);
141 if (ret) {
142 crypto_unregister_alg(&alg_lz4);
143 return ret;
144 }
145
146 return ret;
147}
148
149static void __exit lz4_mod_fini(void)
150{
151 crypto_unregister_alg(&alg_lz4);
152 crypto_unregister_scomp(&scomp);
153}
154
155subsys_initcall(lz4_mod_init);
156module_exit(lz4_mod_fini);
157
158MODULE_LICENSE("GPL");
159MODULE_DESCRIPTION("LZ4 Compression Algorithm");
160MODULE_ALIAS_CRYPTO("lz4");
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
21#include <linux/init.h>
22#include <linux/module.h>
23#include <linux/crypto.h>
24#include <linux/vmalloc.h>
25#include <linux/lz4.h>
26#include <crypto/internal/scompress.h>
27
28struct lz4_ctx {
29 void *lz4_comp_mem;
30};
31
32static void *lz4_alloc_ctx(struct crypto_scomp *tfm)
33{
34 void *ctx;
35
36 ctx = vmalloc(LZ4_MEM_COMPRESS);
37 if (!ctx)
38 return ERR_PTR(-ENOMEM);
39
40 return ctx;
41}
42
43static int lz4_init(struct crypto_tfm *tfm)
44{
45 struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
46
47 ctx->lz4_comp_mem = lz4_alloc_ctx(NULL);
48 if (IS_ERR(ctx->lz4_comp_mem))
49 return -ENOMEM;
50
51 return 0;
52}
53
54static void lz4_free_ctx(struct crypto_scomp *tfm, void *ctx)
55{
56 vfree(ctx);
57}
58
59static void lz4_exit(struct crypto_tfm *tfm)
60{
61 struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
62
63 lz4_free_ctx(NULL, ctx->lz4_comp_mem);
64}
65
66static int __lz4_compress_crypto(const u8 *src, unsigned int slen,
67 u8 *dst, unsigned int *dlen, void *ctx)
68{
69 size_t tmp_len = *dlen;
70 int err;
71
72 err = lz4_compress(src, slen, dst, &tmp_len, ctx);
73
74 if (err < 0)
75 return -EINVAL;
76
77 *dlen = tmp_len;
78 return 0;
79}
80
81static int lz4_scompress(struct crypto_scomp *tfm, const u8 *src,
82 unsigned int slen, u8 *dst, unsigned int *dlen,
83 void *ctx)
84{
85 return __lz4_compress_crypto(src, slen, dst, dlen, ctx);
86}
87
88static int lz4_compress_crypto(struct crypto_tfm *tfm, const u8 *src,
89 unsigned int slen, u8 *dst, unsigned int *dlen)
90{
91 struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
92
93 return __lz4_compress_crypto(src, slen, dst, dlen, ctx->lz4_comp_mem);
94}
95
96static int __lz4_decompress_crypto(const u8 *src, unsigned int slen,
97 u8 *dst, unsigned int *dlen, void *ctx)
98{
99 int err;
100 size_t tmp_len = *dlen;
101 size_t __slen = slen;
102
103 err = lz4_decompress_unknownoutputsize(src, __slen, dst, &tmp_len);
104 if (err < 0)
105 return -EINVAL;
106
107 *dlen = tmp_len;
108 return err;
109}
110
111static int lz4_sdecompress(struct crypto_scomp *tfm, const u8 *src,
112 unsigned int slen, u8 *dst, unsigned int *dlen,
113 void *ctx)
114{
115 return __lz4_decompress_crypto(src, slen, dst, dlen, NULL);
116}
117
118static int lz4_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
119 unsigned int slen, u8 *dst,
120 unsigned int *dlen)
121{
122 return __lz4_decompress_crypto(src, slen, dst, dlen, NULL);
123}
124
125static struct crypto_alg alg_lz4 = {
126 .cra_name = "lz4",
127 .cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
128 .cra_ctxsize = sizeof(struct lz4_ctx),
129 .cra_module = THIS_MODULE,
130 .cra_list = LIST_HEAD_INIT(alg_lz4.cra_list),
131 .cra_init = lz4_init,
132 .cra_exit = lz4_exit,
133 .cra_u = { .compress = {
134 .coa_compress = lz4_compress_crypto,
135 .coa_decompress = lz4_decompress_crypto } }
136};
137
138static struct scomp_alg scomp = {
139 .alloc_ctx = lz4_alloc_ctx,
140 .free_ctx = lz4_free_ctx,
141 .compress = lz4_scompress,
142 .decompress = lz4_sdecompress,
143 .base = {
144 .cra_name = "lz4",
145 .cra_driver_name = "lz4-scomp",
146 .cra_module = THIS_MODULE,
147 }
148};
149
150static int __init lz4_mod_init(void)
151{
152 int ret;
153
154 ret = crypto_register_alg(&alg_lz4);
155 if (ret)
156 return ret;
157
158 ret = crypto_register_scomp(&scomp);
159 if (ret) {
160 crypto_unregister_alg(&alg_lz4);
161 return ret;
162 }
163
164 return ret;
165}
166
167static void __exit lz4_mod_fini(void)
168{
169 crypto_unregister_alg(&alg_lz4);
170 crypto_unregister_scomp(&scomp);
171}
172
173module_init(lz4_mod_init);
174module_exit(lz4_mod_fini);
175
176MODULE_LICENSE("GPL");
177MODULE_DESCRIPTION("LZ4 Compression Algorithm");
178MODULE_ALIAS_CRYPTO("lz4");