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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
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
28 struct lz4_ctx {
29 void *lz4_comp_mem;
30 };
31
32 static 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
43 static 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
54 static void lz4_free_ctx(struct crypto_scomp *tfm, void *ctx)
55 {
56 vfree(ctx);
57 }
58
59 static 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
66 static 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
81 static 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
88 static 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
96 static 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
111 static 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
118 static 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
125 static 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
138 static 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
150 static 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
167 static void __exit lz4_mod_fini(void)
168 {
169 crypto_unregister_alg(&alg_lz4);
170 crypto_unregister_scomp(&scomp);
171 }
172
173 module_init(lz4_mod_init);
174 module_exit(lz4_mod_fini);
175
176 MODULE_LICENSE("GPL");
177 MODULE_DESCRIPTION("LZ4 Compression Algorithm");
178 MODULE_ALIAS_CRYPTO("lz4");