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
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");
97
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TOMOYO® is a registered trademark of NTT DATA CORPORATION.