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 
   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         snprintf(rpcomp.type, CRYPTO_MAX_ALG_NAME, "%s", "pcomp");
   57 
   58         if (nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS,
   59                     sizeof(struct crypto_report_comp), &rpcomp))
   60                 goto nla_put_failure;
   61         return 0;
   62 
   63 nla_put_failure:
   64         return -EMSGSIZE;
   65 }
   66 #else
   67 static int crypto_pcomp_report(struct sk_buff *skb, struct crypto_alg *alg)
   68 {
   69         return -ENOSYS;
   70 }
   71 #endif
   72 
   73 static void crypto_pcomp_show(struct seq_file *m, struct crypto_alg *alg)
   74         __attribute__ ((unused));
   75 static void crypto_pcomp_show(struct seq_file *m, struct crypto_alg *alg)
   76 {
   77         seq_printf(m, "type         : pcomp\n");
   78 }
   79 
   80 static const struct crypto_type crypto_pcomp_type = {
   81         .extsize        = crypto_pcomp_extsize,
   82         .init           = crypto_pcomp_init,
   83         .init_tfm       = crypto_pcomp_init_tfm,
   84 #ifdef CONFIG_PROC_FS
   85         .show           = crypto_pcomp_show,
   86 #endif
   87         .report         = crypto_pcomp_report,
   88         .maskclear      = ~CRYPTO_ALG_TYPE_MASK,
   89         .maskset        = CRYPTO_ALG_TYPE_MASK,
   90         .type           = CRYPTO_ALG_TYPE_PCOMPRESS,
   91         .tfmsize        = offsetof(struct crypto_pcomp, base),
   92 };
   93 
   94 struct crypto_pcomp *crypto_alloc_pcomp(const char *alg_name, u32 type,
   95                                         u32 mask)
   96 {
   97         return crypto_alloc_tfm(alg_name, &crypto_pcomp_type, type, mask);
   98 }
   99 EXPORT_SYMBOL_GPL(crypto_alloc_pcomp);
  100 
  101 int crypto_register_pcomp(struct pcomp_alg *alg)
  102 {
  103         struct crypto_alg *base = &alg->base;
  104 
  105         base->cra_type = &crypto_pcomp_type;
  106         base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
  107         base->cra_flags |= CRYPTO_ALG_TYPE_PCOMPRESS;
  108 
  109         return crypto_register_alg(base);
  110 }
  111 EXPORT_SYMBOL_GPL(crypto_register_pcomp);
  112 
  113 int crypto_unregister_pcomp(struct pcomp_alg *alg)
  114 {
  115         return crypto_unregister_alg(&alg->base);
  116 }
  117 EXPORT_SYMBOL_GPL(crypto_unregister_pcomp);
  118 
  119 MODULE_LICENSE("GPL");
  120 MODULE_DESCRIPTION("Partial (de)compression type");
  121 MODULE_AUTHOR("Sony Corporation");

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FreeBSD/Linux Kernel Cross Reference sys/crypto/pcompress.c

FreeBSD/Linux Kernel Cross Reference
sys/crypto/pcompress.c