LXR linux/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
  22static void init(struct crypto_tfm *tfm)
  23{
  24        tfm->__crt_alg->cra_digest.dia_init(crypto_tfm_ctx(tfm));
  25}
  26
  27static 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 = kmap_atomic(pg) + offset;
  43
  44                        tfm->__crt_alg->cra_digest.dia_update
  45                                        (crypto_tfm_ctx(tfm), p,
  46                                         bytes_from_page);
  47                        kunmap_atomic(p);
  48                        crypto_yield(tfm);
  49                        offset = 0;
  50                        pg++;
  51                        l -= bytes_from_page;
  52                } while (l > 0);
  53        }
  54}
  55
  56static void final(struct crypto_tfm *tfm, u8 *out)
  57{
  58        tfm->__crt_alg->cra_digest.dia_final(crypto_tfm_ctx(tfm), out);
  59}
  60
  61static 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
  70static 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 = kmap_atomic(sg[i].page) + sg[i].offset;
  79                tfm->__crt_alg->cra_digest.dia_update(crypto_tfm_ctx(tfm),
  80                                                      p, sg[i].length);
  81                kunmap_atomic(p);
  82                crypto_yield(tfm);
  83        }
  84        crypto_digest_final(tfm, out);
  85}
  86
  87int crypto_init_digest_flags(struct crypto_tfm *tfm, u32 flags)
  88{
  89        return flags ? -EINVAL : 0;
  90}
  91
  92int 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
 105void crypto_exit_digest_ops(struct crypto_tfm *tfm)
 106{
 107        crypto_free_hmac_block(tfm);
 108}
 109