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