1/*
2 * Cryptographic API.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 as published by
6 * the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
16 *
17 */
18
19#include <linux/init.h>
20#include <linux/module.h>
21#include <linux/crypto.h>
22#include <linux/vmalloc.h>
23#include <linux/mm.h>
24#include <linux/lzo.h>
25#include <crypto/internal/scompress.h>
26
27struct lzorle_ctx {
28 void *lzorle_comp_mem;
29};
30
31static void *lzorle_alloc_ctx(struct crypto_scomp *tfm)
32{
33 void *ctx;
34
35 ctx = kvmalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);
36 if (!ctx)
37 return ERR_PTR(-ENOMEM);
38
39 return ctx;
40}
41
42static int lzorle_init(struct crypto_tfm *tfm)
43{
44 struct lzorle_ctx *ctx = crypto_tfm_ctx(tfm);
45
46 ctx->lzorle_comp_mem = lzorle_alloc_ctx(NULL);
47 if (IS_ERR(ctx->lzorle_comp_mem))
48 return -ENOMEM;
49
50 return 0;
51}
52
53static void lzorle_free_ctx(struct crypto_scomp *tfm, void *ctx)
54{
55 kvfree(ctx);
56}
57
58static void lzorle_exit(struct crypto_tfm *tfm)
59{
60 struct lzorle_ctx *ctx = crypto_tfm_ctx(tfm);
61
62 lzorle_free_ctx(NULL, ctx->lzorle_comp_mem);
63}
64
65static int __lzorle_compress(const u8 *src, unsigned int slen,
66 u8 *dst, unsigned int *dlen, void *ctx)
67{
68 size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
69 int err;
70
71 err = lzorle1x_1_compress(src, slen, dst, &tmp_len, ctx);
72
73 if (err != LZO_E_OK)
74 return -EINVAL;
75
76 *dlen = tmp_len;
77 return 0;
78}
79
80static int lzorle_compress(struct crypto_tfm *tfm, const u8 *src,
81 unsigned int slen, u8 *dst, unsigned int *dlen)
82{
83 struct lzorle_ctx *ctx = crypto_tfm_ctx(tfm);
84
85 return __lzorle_compress(src, slen, dst, dlen, ctx->lzorle_comp_mem);
86}
87
88static int lzorle_scompress(struct crypto_scomp *tfm, const u8 *src,
89 unsigned int slen, u8 *dst, unsigned int *dlen,
90 void *ctx)
91{
92 return __lzorle_compress(src, slen, dst, dlen, ctx);
93}
94
95static int __lzorle_decompress(const u8 *src, unsigned int slen,
96 u8 *dst, unsigned int *dlen)
97{
98 int err;
99 size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
100
101 err = lzo1x_decompress_safe(src, slen, dst, &tmp_len);
102
103 if (err != LZO_E_OK)
104 return -EINVAL;
105
106 *dlen = tmp_len;
107 return 0;
108}
109
110static int lzorle_decompress(struct crypto_tfm *tfm, const u8 *src,
111 unsigned int slen, u8 *dst, unsigned int *dlen)
112{
113 return __lzorle_decompress(src, slen, dst, dlen);
114}
115
116static int lzorle_sdecompress(struct crypto_scomp *tfm, const u8 *src,
117 unsigned int slen, u8 *dst, unsigned int *dlen,
118 void *ctx)
119{
120 return __lzorle_decompress(src, slen, dst, dlen);
121}
122
123static struct crypto_alg alg = {
124 .cra_name = "lzo-rle",
125 .cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
126 .cra_ctxsize = sizeof(struct lzorle_ctx),
127 .cra_module = THIS_MODULE,
128 .cra_init = lzorle_init,
129 .cra_exit = lzorle_exit,
130 .cra_u = { .compress = {
131 .coa_compress = lzorle_compress,
132 .coa_decompress = lzorle_decompress } }
133};
134
135static struct scomp_alg scomp = {
136 .alloc_ctx = lzorle_alloc_ctx,
137 .free_ctx = lzorle_free_ctx,
138 .compress = lzorle_scompress,
139 .decompress = lzorle_sdecompress,
140 .base = {
141 .cra_name = "lzo-rle",
142 .cra_driver_name = "lzo-rle-scomp",
143 .cra_module = THIS_MODULE,
144 }
145};
146
147static int __init lzorle_mod_init(void)
148{
149 int ret;
150
151 ret = crypto_register_alg(&alg);
152 if (ret)
153 return ret;
154
155 ret = crypto_register_scomp(&scomp);
156 if (ret) {
157 crypto_unregister_alg(&alg);
158 return ret;
159 }
160
161 return ret;
162}
163
164static void __exit lzorle_mod_fini(void)
165{
166 crypto_unregister_alg(&alg);
167 crypto_unregister_scomp(&scomp);
168}
169
170module_init(lzorle_mod_init);
171module_exit(lzorle_mod_fini);
172
173MODULE_LICENSE("GPL");
174MODULE_DESCRIPTION("LZO-RLE Compression Algorithm");
175MODULE_ALIAS_CRYPTO("lzo-rle");
176