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