linux/crypto/sha1_generic.c
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   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/sha1.h>
  20#include <crypto/sha1_base.h>
  21#include <asm/byteorder.h>
  22
  23const 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};
  28EXPORT_SYMBOL_GPL(sha1_zero_message_hash);
  29
  30static 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
  42int 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}
  47EXPORT_SYMBOL(crypto_sha1_update);
  48
  49static 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
  55int 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}
  61EXPORT_SYMBOL(crypto_sha1_finup);
  62
  63static 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
  79static int __init sha1_generic_mod_init(void)
  80{
  81        return crypto_register_shash(&alg);
  82}
  83
  84static void __exit sha1_generic_mod_fini(void)
  85{
  86        crypto_unregister_shash(&alg);
  87}
  88
  89subsys_initcall(sha1_generic_mod_init);
  90module_exit(sha1_generic_mod_fini);
  91
  92MODULE_LICENSE("GPL");
  93MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
  94
  95MODULE_ALIAS_CRYPTO("sha1");
  96MODULE_ALIAS_CRYPTO("sha1-generic");
  97
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