crypto/sha1_generic.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Cryptographic API.
   4  *
   5  * SHA1 Secure Hash Algorithm.
   6  *
   7  * Derived from cryptoapi implementation, adapted for in-place
   8  * scatterlist interface.
   9  *
  10  * Copyright (c) Alan Smithee.
  11  * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
  12  * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
  13  */
  14 #include <crypto/internal/hash.h>
  15 #include <linux/init.h>
  16 #include <linux/module.h>
  17 #include <linux/mm.h>
  18 #include <linux/types.h>
  19 #include <crypto/sha.h>
  20 #include <crypto/sha1_base.h>
  21 #include <asm/byteorder.h>
  22
  23 const u8 sha1_zero_message_hash[SHA1_DIGEST_SIZE] = {
  24         0xda, 0x39, 0xa3, 0xee, 0x5e, 0x6b, 0x4b, 0x0d,
  25         0x32, 0x55, 0xbf, 0xef, 0x95, 0x60, 0x18, 0x90,
  26         0xaf, 0xd8, 0x07, 0x09
  27 };
  28 EXPORT_SYMBOL_GPL(sha1_zero_message_hash);
  29
  30 static void sha1_generic_block_fn(struct sha1_state *sst, u8 const *src,
  31                                   int blocks)
  32 {
  33         u32 temp[SHA1_WORKSPACE_WORDS];
  34
  35         while (blocks--) {
  36                 sha1_transform(sst->state, src, temp);
  37                 src += SHA1_BLOCK_SIZE;
  38         }
  39         memzero_explicit(temp, sizeof(temp));
  40 }
  41
  42 int crypto_sha1_update(struct shash_desc *desc, const u8 *data,
  43                        unsigned int len)
  44 {
  45         return sha1_base_do_update(desc, data, len, sha1_generic_block_fn);
  46 }
  47 EXPORT_SYMBOL(crypto_sha1_update);
  48
  49 static int sha1_final(struct shash_desc *desc, u8 *out)
  50 {
  51         sha1_base_do_finalize(desc, sha1_generic_block_fn);
  52         return sha1_base_finish(desc, out);
  53 }
  54
  55 int crypto_sha1_finup(struct shash_desc *desc, const u8 *data,
  56                       unsigned int len, u8 *out)
  57 {
  58         sha1_base_do_update(desc, data, len, sha1_generic_block_fn);
  59         return sha1_final(desc, out);
  60 }
  61 EXPORT_SYMBOL(crypto_sha1_finup);
  62
  63 static struct shash_alg alg = {
  64         .digestsize     =       SHA1_DIGEST_SIZE,
  65         .init           =       sha1_base_init,
  66         .update         =       crypto_sha1_update,
  67         .final          =       sha1_final,
  68         .finup          =       crypto_sha1_finup,
  69         .descsize       =       sizeof(struct sha1_state),
  70         .base           =       {
  71                 .cra_name       =       "sha1",
  72                 .cra_driver_name=       "sha1-generic",
  73                 .cra_priority   =       100,
  74                 .cra_blocksize  =       SHA1_BLOCK_SIZE,
  75                 .cra_module     =       THIS_MODULE,
  76         }
  77 };
  78
  79 static int __init sha1_generic_mod_init(void)
  80 {
  81         return crypto_register_shash(&alg);
  82 }
  83
  84 static void __exit sha1_generic_mod_fini(void)
  85 {
  86         crypto_unregister_shash(&alg);
  87 }
  88
  89 subsys_initcall(sha1_generic_mod_init);
  90 module_exit(sha1_generic_mod_fini);
  91
  92 MODULE_LICENSE("GPL");
  93 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
  94
  95 MODULE_ALIAS_CRYPTO("sha1");
  96 MODULE_ALIAS_CRYPTO("sha1-generic");