Linux Kernel  3.7.1
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pcompress.c
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1 /*
2  * Cryptographic API.
3  *
4  * Partial (de)compression operations.
5  *
6  * Copyright 2008 Sony Corporation
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; version 2 of the License.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program.
19  * If not, see <http://www.gnu.org/licenses/>.
20  */
21 
22 #include <linux/crypto.h>
23 #include <linux/errno.h>
24 #include <linux/module.h>
25 #include <linux/seq_file.h>
26 #include <linux/string.h>
27 #include <linux/cryptouser.h>
28 #include <net/netlink.h>
29 
30 #include <crypto/compress.h>
32 
33 #include "internal.h"
34 
35 
36 static int crypto_pcomp_init(struct crypto_tfm *tfm, u32 type, u32 mask)
37 {
38  return 0;
39 }
40 
41 static unsigned int crypto_pcomp_extsize(struct crypto_alg *alg)
42 {
43  return alg->cra_ctxsize;
44 }
45 
46 static int crypto_pcomp_init_tfm(struct crypto_tfm *tfm)
47 {
48  return 0;
49 }
50 
51 #ifdef CONFIG_NET
52 static int crypto_pcomp_report(struct sk_buff *skb, struct crypto_alg *alg)
53 {
54  struct crypto_report_comp rpcomp;
55 
56  snprintf(rpcomp.type, CRYPTO_MAX_ALG_NAME, "%s", "pcomp");
57 
59  sizeof(struct crypto_report_comp), &rpcomp))
60  goto nla_put_failure;
61  return 0;
62 
63 nla_put_failure:
64  return -EMSGSIZE;
65 }
66 #else
67 static int crypto_pcomp_report(struct sk_buff *skb, struct crypto_alg *alg)
68 {
69  return -ENOSYS;
70 }
71 #endif
72 
73 static void crypto_pcomp_show(struct seq_file *m, struct crypto_alg *alg)
75 static void crypto_pcomp_show(struct seq_file *m, struct crypto_alg *alg)
76 {
77  seq_printf(m, "type : pcomp\n");
78 }
79 
80 static const struct crypto_type crypto_pcomp_type = {
81  .extsize = crypto_pcomp_extsize,
82  .init = crypto_pcomp_init,
83  .init_tfm = crypto_pcomp_init_tfm,
84 #ifdef CONFIG_PROC_FS
85  .show = crypto_pcomp_show,
86 #endif
87  .report = crypto_pcomp_report,
88  .maskclear = ~CRYPTO_ALG_TYPE_MASK,
89  .maskset = CRYPTO_ALG_TYPE_MASK,
91  .tfmsize = offsetof(struct crypto_pcomp, base),
92 };
93 
94 struct crypto_pcomp *crypto_alloc_pcomp(const char *alg_name, u32 type,
95  u32 mask)
96 {
97  return crypto_alloc_tfm(alg_name, &crypto_pcomp_type, type, mask);
98 }
100 
102 {
103  struct crypto_alg *base = &alg->base;
104 
105  base->cra_type = &crypto_pcomp_type;
108 
109  return crypto_register_alg(base);
110 }
112 
114 {
115  return crypto_unregister_alg(&alg->base);
116 }
118 
119 MODULE_LICENSE("GPL");
120 MODULE_DESCRIPTION("Partial (de)compression type");
121 MODULE_AUTHOR("Sony Corporation");