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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>
31 #include <crypto/internal/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 strncpy(rpcomp.type, "pcomp", sizeof(rpcomp.type));
57 if (nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS,
58 sizeof(struct crypto_report_comp), &rpcomp))
59 goto nla_put_failure;
60 return 0;
61
62 nla_put_failure:
63 return -EMSGSIZE;
64 }
65 #else
66 static int crypto_pcomp_report(struct sk_buff *skb, struct crypto_alg *alg)
67 {
68 return -ENOSYS;
69 }
70 #endif
71
72 static void crypto_pcomp_show(struct seq_file *m, struct crypto_alg *alg)
73 __attribute__ ((unused));
74 static void crypto_pcomp_show(struct seq_file *m, struct crypto_alg *alg)
75 {
76 seq_printf(m, "type : pcomp\n");
77 }
78
79 static const struct crypto_type crypto_pcomp_type = {
80 .extsize = crypto_pcomp_extsize,
81 .init = crypto_pcomp_init,
82 .init_tfm = crypto_pcomp_init_tfm,
83 #ifdef CONFIG_PROC_FS
84 .show = crypto_pcomp_show,
85 #endif
86 .report = crypto_pcomp_report,
87 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
88 .maskset = CRYPTO_ALG_TYPE_MASK,
89 .type = CRYPTO_ALG_TYPE_PCOMPRESS,
90 .tfmsize = offsetof(struct crypto_pcomp, base),
91 };
92
93 struct crypto_pcomp *crypto_alloc_pcomp(const char *alg_name, u32 type,
94 u32 mask)
95 {
96 return crypto_alloc_tfm(alg_name, &crypto_pcomp_type, type, mask);
97 }
98 EXPORT_SYMBOL_GPL(crypto_alloc_pcomp);
99
100 int crypto_register_pcomp(struct pcomp_alg *alg)
101 {
102 struct crypto_alg *base = &alg->base;
103
104 base->cra_type = &crypto_pcomp_type;
105 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
106 base->cra_flags |= CRYPTO_ALG_TYPE_PCOMPRESS;
107
108 return crypto_register_alg(base);
109 }
110 EXPORT_SYMBOL_GPL(crypto_register_pcomp);
111
112 int crypto_unregister_pcomp(struct pcomp_alg *alg)
113 {
114 return crypto_unregister_alg(&alg->base);
115 }
116 EXPORT_SYMBOL_GPL(crypto_unregister_pcomp);
117
118 MODULE_LICENSE("GPL");
119 MODULE_DESCRIPTION("Partial (de)compression type");
120 MODULE_AUTHOR("Sony Corporation");