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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 | |
27 | struct lz4_ctx { |
28 | void *lz4_comp_mem; |
29 | }; |
30 | |
31 | static int lz4_init(struct crypto_tfm *tfm) |
32 | { |
33 | struct lz4_ctx *ctx = crypto_tfm_ctx(tfm); |
34 | |
35 | ctx->lz4_comp_mem = vmalloc(LZ4_MEM_COMPRESS); |
36 | if (!ctx->lz4_comp_mem) |
37 | return -ENOMEM; |
38 | |
39 | return 0; |
40 | } |
41 | |
42 | static void lz4_exit(struct crypto_tfm *tfm) |
43 | { |
44 | struct lz4_ctx *ctx = crypto_tfm_ctx(tfm); |
45 | vfree(ctx->lz4_comp_mem); |
46 | } |
47 | |
48 | static int lz4_compress_crypto(struct crypto_tfm *tfm, const u8 *src, |
49 | unsigned int slen, u8 *dst, unsigned int *dlen) |
50 | { |
51 | struct lz4_ctx *ctx = crypto_tfm_ctx(tfm); |
52 | size_t tmp_len = *dlen; |
53 | int err; |
54 | |
55 | err = lz4_compress(src, slen, dst, &tmp_len, ctx->lz4_comp_mem); |
56 | |
57 | if (err < 0) |
58 | return -EINVAL; |
59 | |
60 | *dlen = tmp_len; |
61 | return 0; |
62 | } |
63 | |
64 | static int lz4_decompress_crypto(struct crypto_tfm *tfm, const u8 *src, |
65 | unsigned int slen, u8 *dst, unsigned int *dlen) |
66 | { |
67 | int err; |
68 | size_t tmp_len = *dlen; |
69 | size_t __slen = slen; |
70 | |
71 | err = lz4_decompress(src, &__slen, dst, tmp_len); |
72 | if (err < 0) |
73 | return -EINVAL; |
74 | |
75 | *dlen = tmp_len; |
76 | return err; |
77 | } |
78 | |
79 | static struct crypto_alg alg_lz4 = { |
80 | .cra_name = "lz4", |
81 | .cra_flags = CRYPTO_ALG_TYPE_COMPRESS, |
82 | .cra_ctxsize = sizeof(struct lz4_ctx), |
83 | .cra_module = THIS_MODULE, |
84 | .cra_list = LIST_HEAD_INIT(alg_lz4.cra_list), |
85 | .cra_init = lz4_init, |
86 | .cra_exit = lz4_exit, |
87 | .cra_u = { .compress = { |
88 | .coa_compress = lz4_compress_crypto, |
89 | .coa_decompress = lz4_decompress_crypto } } |
90 | }; |
91 | |
92 | static int __init lz4_mod_init(void) |
93 | { |
94 | return crypto_register_alg(&alg_lz4); |
95 | } |
96 | |
97 | static void __exit lz4_mod_fini(void) |
98 | { |
99 | crypto_unregister_alg(&alg_lz4); |
100 | } |
101 | |
102 | module_init(lz4_mod_init); |
103 | module_exit(lz4_mod_fini); |
104 | |
105 | MODULE_LICENSE("GPL"); |
106 | MODULE_DESCRIPTION("LZ4 Compression Algorithm"); |
107 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9