drivers/staging/rtl8192u/ieee80211/digest.c

   1 /*
   2  * Cryptographic API.
   3  *
   4  * Digest 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/crypto.h>
  15 #include "rtl_crypto.h"
  16 #include <linux/mm.h>
  17 #include <linux/errno.h>
  18 #include <linux/highmem.h>
  19 #include <asm/scatterlist.h>
  20 #include "internal.h"
  21
  22 static void init(struct crypto_tfm *tfm)
  23 {
  24         tfm->__crt_alg->cra_digest.dia_init(crypto_tfm_ctx(tfm));
  25 }
  26
  27 static void update(struct crypto_tfm *tfm,
  28                    struct scatterlist *sg, unsigned int nsg)
  29 {
  30         unsigned int i;
  31
  32         for (i = 0; i < nsg; i++) {
  33
  34                 struct page *pg = sg[i].page;
  35                 unsigned int offset = sg[i].offset;
  36                 unsigned int l = sg[i].length;
  37
  38                 do {
  39                         unsigned int bytes_from_page = min(l, ((unsigned int)
  40                                                            (PAGE_SIZE)) -
  41                                                            offset);
  42                         char *p = crypto_kmap(pg, 0) + offset;
  43
  44                         tfm->__crt_alg->cra_digest.dia_update
  45                                         (crypto_tfm_ctx(tfm), p,
  46                                          bytes_from_page);
  47                         crypto_kunmap(p, 0);
  48                         crypto_yield(tfm);
  49                         offset = 0;
  50                         pg++;
  51                         l -= bytes_from_page;
  52                 } while (l > 0);
  53         }
  54 }
  55
  56 static void final(struct crypto_tfm *tfm, u8 *out)
  57 {
  58         tfm->__crt_alg->cra_digest.dia_final(crypto_tfm_ctx(tfm), out);
  59 }
  60
  61 static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
  62 {
  63         u32 flags;
  64         if (tfm->__crt_alg->cra_digest.dia_setkey == NULL)
  65                 return -ENOSYS;
  66         return tfm->__crt_alg->cra_digest.dia_setkey(crypto_tfm_ctx(tfm),
  67                                                      key, keylen, &flags);
  68 }
  69
  70 static void digest(struct crypto_tfm *tfm,
  71                    struct scatterlist *sg, unsigned int nsg, u8 *out)
  72 {
  73         unsigned int i;
  74
  75         tfm->crt_digest.dit_init(tfm);
  76
  77         for (i = 0; i < nsg; i++) {
  78                 char *p = crypto_kmap(sg[i].page, 0) + sg[i].offset;
  79                 tfm->__crt_alg->cra_digest.dia_update(crypto_tfm_ctx(tfm),
  80                                                       p, sg[i].length);
  81                 crypto_kunmap(p, 0);
  82                 crypto_yield(tfm);
  83         }
  84         crypto_digest_final(tfm, out);
  85 }
  86
  87 int crypto_init_digest_flags(struct crypto_tfm *tfm, u32 flags)
  88 {
  89         return flags ? -EINVAL : 0;
  90 }
  91
  92 int crypto_init_digest_ops(struct crypto_tfm *tfm)
  93 {
  94         struct digest_tfm *ops = &tfm->crt_digest;
  95
  96         ops->dit_init   = init;
  97         ops->dit_update = update;
  98         ops->dit_final  = final;
  99         ops->dit_digest = digest;
 100         ops->dit_setkey = setkey;
 101
 102         return crypto_alloc_hmac_block(tfm);
 103 }
 104
 105 void crypto_exit_digest_ops(struct crypto_tfm *tfm)
 106 {
 107         crypto_free_hmac_block(tfm);
 108 }