LXR linux/crypto/sha1

   1/*
   2 * Cryptographic API.
   3 *
   4 * SHA1 Secure Hash Algorithm.
   5 *
   6 * Derived from cryptoapi implementation, adapted for in-place
   7 * scatterlist interface.
   8 *
   9 * Copyright (c) Alan Smithee.
  10 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
  11 * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
  12 *
  13 * This program is free software; you can redistribute it and/or modify it
  14 * under the terms of the GNU General Public License as published by the Free
  15 * Software Foundation; either version 2 of the License, or (at your option)
  16 * any later version.
  17 *
  18 */
  19#include <crypto/internal/hash.h>
  20#include <linux/init.h>
  21#include <linux/module.h>
  22#include <linux/mm.h>
  23#include <linux/cryptohash.h>
  24#include <linux/types.h>
  25#include <crypto/sha.h>
  26#include <crypto/sha1_base.h>
  27#include <asm/byteorder.h>
  28
  29const u8 sha1_zero_message_hash[SHA1_DIGEST_SIZE] = {
  30        0xda, 0x39, 0xa3, 0xee, 0x5e, 0x6b, 0x4b, 0x0d,
  31        0x32, 0x55, 0xbf, 0xef, 0x95, 0x60, 0x18, 0x90,
  32        0xaf, 0xd8, 0x07, 0x09
  33};
  34EXPORT_SYMBOL_GPL(sha1_zero_message_hash);
  35
  36static void sha1_generic_block_fn(struct sha1_state *sst, u8 const *src,
  37                                  int blocks)
  38{
  39        u32 temp[SHA_WORKSPACE_WORDS];
  40
  41        while (blocks--) {
  42                sha_transform(sst->state, src, temp);
  43                src += SHA1_BLOCK_SIZE;
  44        }
  45        memzero_explicit(temp, sizeof(temp));
  46}
  47
  48int crypto_sha1_update(struct shash_desc *desc, const u8 *data,
  49                       unsigned int len)
  50{
  51        return sha1_base_do_update(desc, data, len, sha1_generic_block_fn);
  52}
  53EXPORT_SYMBOL(crypto_sha1_update);
  54
  55static int sha1_final(struct shash_desc *desc, u8 *out)
  56{
  57        sha1_base_do_finalize(desc, sha1_generic_block_fn);
  58        return sha1_base_finish(desc, out);
  59}
  60
  61int crypto_sha1_finup(struct shash_desc *desc, const u8 *data,
  62                      unsigned int len, u8 *out)
  63{
  64        sha1_base_do_update(desc, data, len, sha1_generic_block_fn);
  65        return sha1_final(desc, out);
  66}
  67EXPORT_SYMBOL(crypto_sha1_finup);
  68
  69static struct shash_alg alg = {
  70        .digestsize     =       SHA1_DIGEST_SIZE,
  71        .init           =       sha1_base_init,
  72        .update         =       crypto_sha1_update,
  73        .final          =       sha1_final,
  74        .finup          =       crypto_sha1_finup,
  75        .descsize       =       sizeof(struct sha1_state),
  76        .base           =       {
  77                .cra_name       =       "sha1",
  78                .cra_driver_name=       "sha1-generic",
  79                .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
  80                .cra_blocksize  =       SHA1_BLOCK_SIZE,
  81                .cra_module     =       THIS_MODULE,
  82        }
  83};
  84
  85static int __init sha1_generic_mod_init(void)
  86{
  87        return crypto_register_shash(&alg);
  88}
  89
  90static void __exit sha1_generic_mod_fini(void)
  91{
  92        crypto_unregister_shash(&alg);
  93}
  94
  95module_init(sha1_generic_mod_init);
  96module_exit(sha1_generic_mod_fini);
  97
  98MODULE_LICENSE("GPL");
  99MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
 100
 101MODULE_ALIAS_CRYPTO("sha1");
 102MODULE_ALIAS_CRYPTO("sha1-generic");
 103