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(digest: sst->state, data: src, W: temp);
37 src += SHA1_BLOCK_SIZE;
38 }
39 memzero_explicit(s: temp, count: 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, block_fn: 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, block_fn: 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, block_fn: 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: &alg);
82}
83
84static void __exit sha1_generic_mod_fini(void)
85{
86 crypto_unregister_shash(alg: &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

source code of linux/crypto/sha1_generic.c