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
  28#include <crypto/compress.h>
  29
  30#include "internal.h"
  31
  32
  33static int crypto_pcomp_init(struct crypto_tfm *tfm, u32 type, u32 mask)
  34{
  35        return 0;
  36}
  37
  38static unsigned int crypto_pcomp_extsize(struct crypto_alg *alg,
  39                                         const struct crypto_type *frontend)
  40{
  41        return alg->cra_ctxsize;
  42}
  43
  44static int crypto_pcomp_init_tfm(struct crypto_tfm *tfm,
  45                                 const struct crypto_type *frontend)
  46{
  47        return 0;
  48}
  49
  50static void crypto_pcomp_show(struct seq_file *m, struct crypto_alg *alg)
  51        __attribute__ ((unused));
  52static void crypto_pcomp_show(struct seq_file *m, struct crypto_alg *alg)
  53{
  54        seq_printf(m, "type         : pcomp\n");
  55}
  56
  57static const struct crypto_type crypto_pcomp_type = {
  58        .extsize        = crypto_pcomp_extsize,
  59        .init           = crypto_pcomp_init,
  60        .init_tfm       = crypto_pcomp_init_tfm,
  61#ifdef CONFIG_PROC_FS
  62        .show           = crypto_pcomp_show,
  63#endif
  64        .maskclear      = ~CRYPTO_ALG_TYPE_MASK,
  65        .maskset        = CRYPTO_ALG_TYPE_MASK,
  66        .type           = CRYPTO_ALG_TYPE_PCOMPRESS,
  67        .tfmsize        = offsetof(struct crypto_pcomp, base),
  68};
  69
  70struct crypto_pcomp *crypto_alloc_pcomp(const char *alg_name, u32 type,
  71                                        u32 mask)
  72{
  73        return crypto_alloc_tfm(alg_name, &crypto_pcomp_type, type, mask);
  74}
  75EXPORT_SYMBOL_GPL(crypto_alloc_pcomp);
  76
  77int crypto_register_pcomp(struct pcomp_alg *alg)
  78{
  79        struct crypto_alg *base = &alg->base;
  80
  81        base->cra_type = &crypto_pcomp_type;
  82        base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
  83        base->cra_flags |= CRYPTO_ALG_TYPE_PCOMPRESS;
  84
  85        return crypto_register_alg(base);
  86}
  87EXPORT_SYMBOL_GPL(crypto_register_pcomp);
  88
  89int crypto_unregister_pcomp(struct pcomp_alg *alg)
  90{
  91        return crypto_unregister_alg(&alg->base);
  92}
  93EXPORT_SYMBOL_GPL(crypto_unregister_pcomp);
  94
  95MODULE_LICENSE("GPL");
  96MODULE_DESCRIPTION("Partial (de)compression type");
  97MODULE_AUTHOR("Sony Corporation");
  98