crypto/sha1_generic.c

   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
  29 const 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 };
  34 EXPORT_SYMBOL_GPL(sha1_zero_message_hash);
  35
  36 static 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
  48 int 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 }
  53 EXPORT_SYMBOL(crypto_sha1_update);
  54
  55 static 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
  61 int 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 }
  67 EXPORT_SYMBOL(crypto_sha1_finup);
  68
  69 static 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_priority   =       100,
  80                 .cra_blocksize  =       SHA1_BLOCK_SIZE,
  81                 .cra_module     =       THIS_MODULE,
  82         }
  83 };
  84
  85 static int __init sha1_generic_mod_init(void)
  86 {
  87         return crypto_register_shash(&alg);
  88 }
  89
  90 static void __exit sha1_generic_mod_fini(void)
  91 {
  92         crypto_unregister_shash(&alg);
  93 }
  94
  95 module_init(sha1_generic_mod_init);
  96 module_exit(sha1_generic_mod_fini);
  97
  98 MODULE_LICENSE("GPL");
  99 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
 100
 101 MODULE_ALIAS_CRYPTO("sha1");
 102 MODULE_ALIAS_CRYPTO("sha1-generic");