crypto/compress.c

   1 /*
   2  * Cryptographic API.
   3  *
   4  * Compression operations.
   5  *
   6  * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License as published by the Free
  10  * Software Foundation; either version 2 of the License, or (at your option)
  11  * any later version.
  12  *
  13  */
  14 #include <linux/types.h>
  15 #include <linux/crypto.h>
  16 #include <linux/errno.h>
  17 #include <asm/scatterlist.h>
  18 #include <linux/string.h>
  19 #include "internal.h"
  20
  21 static int crypto_compress(struct crypto_tfm *tfm,
  22                             const u8 *src, unsigned int slen,
  23                             u8 *dst, unsigned int *dlen)
  24 {
  25         return tfm->__crt_alg->cra_compress.coa_compress(crypto_tfm_ctx(tfm),
  26                                                          src, slen, dst,
  27                                                          dlen);
  28 }
  29
  30 static int crypto_decompress(struct crypto_tfm *tfm,
  31                              const u8 *src, unsigned int slen,
  32                              u8 *dst, unsigned int *dlen)
  33 {
  34         return tfm->__crt_alg->cra_compress.coa_decompress(crypto_tfm_ctx(tfm),
  35                                                            src, slen, dst,
  36                                                            dlen);
  37 }
  38
  39 int crypto_init_compress_flags(struct crypto_tfm *tfm, u32 flags)
  40 {
  41         return flags ? -EINVAL : 0;
  42 }
  43
  44 int crypto_init_compress_ops(struct crypto_tfm *tfm)
  45 {
  46         int ret = 0;
  47         struct compress_tfm *ops = &tfm->crt_compress;
  48
  49         ret = tfm->__crt_alg->cra_compress.coa_init(crypto_tfm_ctx(tfm));
  50         if (ret)
  51                 goto out;
  52
  53         ops->cot_compress = crypto_compress;
  54         ops->cot_decompress = crypto_decompress;
  55
  56 out:
  57         return ret;
  58 }
  59
  60 void crypto_exit_compress_ops(struct crypto_tfm *tfm)
  61 {
  62         tfm->__crt_alg->cra_compress.coa_exit(crypto_tfm_ctx(tfm));
  63 }