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