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");