Merge tag 'arc-4.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc
[linux-2.6-block.git] / crypto / lzo.c
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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>
42614b05 23#include <linux/mm.h>
0b77abb3 24#include <linux/lzo.h>
ac9d2c4b 25#include <crypto/internal/scompress.h>
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26
27struct lzo_ctx {
28 void *lzo_comp_mem;
29};
30
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31static void *lzo_alloc_ctx(struct crypto_scomp *tfm)
32{
33 void *ctx;
34
752ade68 35 ctx = kvmalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);
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36 if (!ctx)
37 return ERR_PTR(-ENOMEM);
38
39 return ctx;
40}
41
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42static int lzo_init(struct crypto_tfm *tfm)
43{
44 struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
45
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46 ctx->lzo_comp_mem = lzo_alloc_ctx(NULL);
47 if (IS_ERR(ctx->lzo_comp_mem))
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48 return -ENOMEM;
49
50 return 0;
51}
52
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53static void lzo_free_ctx(struct crypto_scomp *tfm, void *ctx)
54{
55 kvfree(ctx);
56}
57
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58static void lzo_exit(struct crypto_tfm *tfm)
59{
60 struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
61
ac9d2c4b 62 lzo_free_ctx(NULL, ctx->lzo_comp_mem);
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63}
64
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65static int __lzo_compress(const u8 *src, unsigned int slen,
66 u8 *dst, unsigned int *dlen, void *ctx)
0b77abb3 67{
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68 size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
69 int err;
70
ac9d2c4b 71 err = lzo1x_1_compress(src, slen, dst, &tmp_len, ctx);
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72
73 if (err != LZO_E_OK)
74 return -EINVAL;
75
76 *dlen = tmp_len;
77 return 0;
78}
79
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80static int lzo_compress(struct crypto_tfm *tfm, const u8 *src,
81 unsigned int slen, u8 *dst, unsigned int *dlen)
82{
83 struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
84
85 return __lzo_compress(src, slen, dst, dlen, ctx->lzo_comp_mem);
86}
87
88static int lzo_scompress(struct crypto_scomp *tfm, const u8 *src,
89 unsigned int slen, u8 *dst, unsigned int *dlen,
90 void *ctx)
91{
92 return __lzo_compress(src, slen, dst, dlen, ctx);
93}
94
95static int __lzo_decompress(const u8 *src, unsigned int slen,
96 u8 *dst, unsigned int *dlen)
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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;
ac9d2c4b 108}
0b77abb3 109
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110static int lzo_decompress(struct crypto_tfm *tfm, const u8 *src,
111 unsigned int slen, u8 *dst, unsigned int *dlen)
112{
113 return __lzo_decompress(src, slen, dst, dlen);
114}
115
116static int lzo_sdecompress(struct crypto_scomp *tfm, const u8 *src,
117 unsigned int slen, u8 *dst, unsigned int *dlen,
118 void *ctx)
119{
120 return __lzo_decompress(src, slen, dst, dlen);
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121}
122
123static struct crypto_alg alg = {
124 .cra_name = "lzo",
125 .cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
126 .cra_ctxsize = sizeof(struct lzo_ctx),
127 .cra_module = THIS_MODULE,
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128 .cra_init = lzo_init,
129 .cra_exit = lzo_exit,
130 .cra_u = { .compress = {
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131 .coa_compress = lzo_compress,
132 .coa_decompress = lzo_decompress } }
133};
134
135static struct scomp_alg scomp = {
136 .alloc_ctx = lzo_alloc_ctx,
137 .free_ctx = lzo_free_ctx,
138 .compress = lzo_scompress,
139 .decompress = lzo_sdecompress,
140 .base = {
141 .cra_name = "lzo",
142 .cra_driver_name = "lzo-scomp",
143 .cra_module = THIS_MODULE,
144 }
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145};
146
3af5b90b 147static int __init lzo_mod_init(void)
0b77abb3 148{
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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;
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162}
163
3af5b90b 164static void __exit lzo_mod_fini(void)
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165{
166 crypto_unregister_alg(&alg);
ac9d2c4b 167 crypto_unregister_scomp(&scomp);
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168}
169
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170module_init(lzo_mod_init);
171module_exit(lzo_mod_fini);
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172
173MODULE_LICENSE("GPL");
174MODULE_DESCRIPTION("LZO Compression Algorithm");
5d26a105 175MODULE_ALIAS_CRYPTO("lzo");