kernel/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 static void sha1_generic_block_fn(struct sha1_state *sst, u8 const *src,
  30                                   int blocks)
  31 {
  32         u32 temp[SHA_WORKSPACE_WORDS];
  33
  34         while (blocks--) {
  35                 sha_transform(sst->state, src, temp);
  36                 src += SHA1_BLOCK_SIZE;
  37         }
  38         memzero_explicit(temp, sizeof(temp));
  39 }
  40
  41 int crypto_sha1_update(struct shash_desc *desc, const u8 *data,
  42                        unsigned int len)
  43 {
  44         return sha1_base_do_update(desc, data, len, sha1_generic_block_fn);
  45 }
  46 EXPORT_SYMBOL(crypto_sha1_update);
  47
  48 static int sha1_final(struct shash_desc *desc, u8 *out)
  49 {
  50         sha1_base_do_finalize(desc, sha1_generic_block_fn);
  51         return sha1_base_finish(desc, out);
  52 }
  53
  54 int crypto_sha1_finup(struct shash_desc *desc, const u8 *data,
  55                       unsigned int len, u8 *out)
  56 {
  57         sha1_base_do_update(desc, data, len, sha1_generic_block_fn);
  58         return sha1_final(desc, out);
  59 }
  60 EXPORT_SYMBOL(crypto_sha1_finup);
  61
  62 static struct shash_alg alg = {
  63         .digestsize     =       SHA1_DIGEST_SIZE,
  64         .init           =       sha1_base_init,
  65         .update         =       crypto_sha1_update,
  66         .final          =       sha1_final,
  67         .finup          =       crypto_sha1_finup,
  68         .descsize       =       sizeof(struct sha1_state),
  69         .base           =       {
  70                 .cra_name       =       "sha1",
  71                 .cra_driver_name=       "sha1-generic",
  72                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
  73                 .cra_blocksize  =       SHA1_BLOCK_SIZE,
  74                 .cra_module     =       THIS_MODULE,
  75         }
  76 };
  77
  78 static int __init sha1_generic_mod_init(void)
  79 {
  80         return crypto_register_shash(&alg);
  81 }
  82
  83 static void __exit sha1_generic_mod_fini(void)
  84 {
  85         crypto_unregister_shash(&alg);
  86 }
  87
  88 module_init(sha1_generic_mod_init);
  89 module_exit(sha1_generic_mod_fini);
  90
  91 MODULE_LICENSE("GPL");
  92 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
  93
  94 MODULE_ALIAS_CRYPTO("sha1");
  95 MODULE_ALIAS_CRYPTO("sha1-generic");