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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> |
23 | #include <linux/lzo.h> |
24 | |
25 | struct lzo_ctx { |
26 | void *lzo_comp_mem; |
27 | }; |
28 | |
29 | static int lzo_init(struct crypto_tfm *tfm) |
30 | { |
31 | struct lzo_ctx *ctx = crypto_tfm_ctx(tfm); |
32 | |
33 | ctx->lzo_comp_mem = vmalloc(LZO1X_MEM_COMPRESS); |
34 | if (!ctx->lzo_comp_mem) |
35 | return -ENOMEM; |
36 | |
37 | return 0; |
38 | } |
39 | |
40 | static void lzo_exit(struct crypto_tfm *tfm) |
41 | { |
42 | struct lzo_ctx *ctx = crypto_tfm_ctx(tfm); |
43 | |
44 | vfree(ctx->lzo_comp_mem); |
45 | } |
46 | |
47 | static int lzo_compress(struct crypto_tfm *tfm, const u8 *src, |
48 | unsigned int slen, u8 *dst, unsigned int *dlen) |
49 | { |
50 | struct lzo_ctx *ctx = crypto_tfm_ctx(tfm); |
51 | size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */ |
52 | int err; |
53 | |
54 | err = lzo1x_1_compress(src, slen, dst, &tmp_len, ctx->lzo_comp_mem); |
55 | |
56 | if (err != LZO_E_OK) |
57 | return -EINVAL; |
58 | |
59 | *dlen = tmp_len; |
60 | return 0; |
61 | } |
62 | |
63 | static int lzo_decompress(struct crypto_tfm *tfm, const u8 *src, |
64 | unsigned int slen, u8 *dst, unsigned int *dlen) |
65 | { |
66 | int err; |
67 | size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */ |
68 | |
69 | err = lzo1x_decompress_safe(src, slen, dst, &tmp_len); |
70 | |
71 | if (err != LZO_E_OK) |
72 | return -EINVAL; |
73 | |
74 | *dlen = tmp_len; |
75 | return 0; |
76 | |
77 | } |
78 | |
79 | static struct crypto_alg alg = { |
80 | .cra_name = "lzo", |
81 | .cra_flags = CRYPTO_ALG_TYPE_COMPRESS, |
82 | .cra_ctxsize = sizeof(struct lzo_ctx), |
83 | .cra_module = THIS_MODULE, |
84 | .cra_init = lzo_init, |
85 | .cra_exit = lzo_exit, |
86 | .cra_u = { .compress = { |
87 | .coa_compress = lzo_compress, |
88 | .coa_decompress = lzo_decompress } } |
89 | }; |
90 | |
91 | static int __init lzo_mod_init(void) |
92 | { |
93 | return crypto_register_alg(&alg); |
94 | } |
95 | |
96 | static void __exit lzo_mod_fini(void) |
97 | { |
98 | crypto_unregister_alg(&alg); |
99 | } |
100 | |
101 | module_init(lzo_mod_init); |
102 | module_exit(lzo_mod_fini); |
103 | |
104 | MODULE_LICENSE("GPL"); |
105 | MODULE_DESCRIPTION("LZO Compression Algorithm"); |
106 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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v3.9