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Linux kernel mirror (for testing)
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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/cryptohash.h>
19#include <linux/types.h>
20#include <crypto/sha.h>
21#include <crypto/sha1_base.h>
22#include <asm/byteorder.h>
23
24const u8 sha1_zero_message_hash[SHA1_DIGEST_SIZE] = {
25 0xda, 0x39, 0xa3, 0xee, 0x5e, 0x6b, 0x4b, 0x0d,
26 0x32, 0x55, 0xbf, 0xef, 0x95, 0x60, 0x18, 0x90,
27 0xaf, 0xd8, 0x07, 0x09
28};
29EXPORT_SYMBOL_GPL(sha1_zero_message_hash);
30
31static void sha1_generic_block_fn(struct sha1_state *sst, u8 const *src,
32 int blocks)
33{
34 u32 temp[SHA_WORKSPACE_WORDS];
35
36 while (blocks--) {
37 sha_transform(sst->state, src, temp);
38 src += SHA1_BLOCK_SIZE;
39 }
40 memzero_explicit(temp, sizeof(temp));
41}
42
43int crypto_sha1_update(struct shash_desc *desc, const u8 *data,
44 unsigned int len)
45{
46 return sha1_base_do_update(desc, data, len, sha1_generic_block_fn);
47}
48EXPORT_SYMBOL(crypto_sha1_update);
49
50static int sha1_final(struct shash_desc *desc, u8 *out)
51{
52 sha1_base_do_finalize(desc, sha1_generic_block_fn);
53 return sha1_base_finish(desc, out);
54}
55
56int crypto_sha1_finup(struct shash_desc *desc, const u8 *data,
57 unsigned int len, u8 *out)
58{
59 sha1_base_do_update(desc, data, len, sha1_generic_block_fn);
60 return sha1_final(desc, out);
61}
62EXPORT_SYMBOL(crypto_sha1_finup);
63
64static struct shash_alg alg = {
65 .digestsize = SHA1_DIGEST_SIZE,
66 .init = sha1_base_init,
67 .update = crypto_sha1_update,
68 .final = sha1_final,
69 .finup = crypto_sha1_finup,
70 .descsize = sizeof(struct sha1_state),
71 .base = {
72 .cra_name = "sha1",
73 .cra_driver_name= "sha1-generic",
74 .cra_priority = 100,
75 .cra_blocksize = SHA1_BLOCK_SIZE,
76 .cra_module = THIS_MODULE,
77 }
78};
79
80static int __init sha1_generic_mod_init(void)
81{
82 return crypto_register_shash(&alg);
83}
84
85static void __exit sha1_generic_mod_fini(void)
86{
87 crypto_unregister_shash(&alg);
88}
89
90subsys_initcall(sha1_generic_mod_init);
91module_exit(sha1_generic_mod_fini);
92
93MODULE_LICENSE("GPL");
94MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
95
96MODULE_ALIAS_CRYPTO("sha1");
97MODULE_ALIAS_CRYPTO("sha1-generic");