linux/crypto/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>
  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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