Root/crypto/pcompress.c

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
36static int crypto_pcomp_init(struct crypto_tfm *tfm, u32 type, u32 mask)
37{
38    return 0;
39}
40
41static unsigned int crypto_pcomp_extsize(struct crypto_alg *alg)
42{
43    return alg->cra_ctxsize;
44}
45
46static int crypto_pcomp_init_tfm(struct crypto_tfm *tfm)
47{
48    return 0;
49}
50
51#ifdef CONFIG_NET
52static 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
62nla_put_failure:
63    return -EMSGSIZE;
64}
65#else
66static int crypto_pcomp_report(struct sk_buff *skb, struct crypto_alg *alg)
67{
68    return -ENOSYS;
69}
70#endif
71
72static void crypto_pcomp_show(struct seq_file *m, struct crypto_alg *alg)
73    __attribute__ ((unused));
74static void crypto_pcomp_show(struct seq_file *m, struct crypto_alg *alg)
75{
76    seq_printf(m, "type : pcomp\n");
77}
78
79static 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
93struct 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}
98EXPORT_SYMBOL_GPL(crypto_alloc_pcomp);
99
100int 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}
110EXPORT_SYMBOL_GPL(crypto_register_pcomp);
111
112int crypto_unregister_pcomp(struct pcomp_alg *alg)
113{
114    return crypto_unregister_alg(&alg->base);
115}
116EXPORT_SYMBOL_GPL(crypto_unregister_pcomp);
117
118MODULE_LICENSE("GPL");
119MODULE_DESCRIPTION("Partial (de)compression type");
120MODULE_AUTHOR("Sony Corporation");
121

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