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1 | /* | |
2 | * Cryptographic API. | |
3 | * | |
4 | * SHA1 Secure Hash Algorithm. | |
5 | * | |
6 | * Derived from cryptoapi implementation, adapted for in-place | |
7 | * scatterlist interface. | |
8 | * | |
9 | * Copyright (c) Alan Smithee. | |
10 | * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk> | |
11 | * Copyright (c) Jean-Francois Dive <jef@linuxbe.org> | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify it | |
14 | * under the terms of the GNU General Public License as published by the Free | |
15 | * Software Foundation; either version 2 of the License, or (at your option) | |
16 | * any later version. | |
17 | * | |
18 | */ | |
19 | #include <crypto/internal/hash.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/mm.h> | |
23 | #include <linux/cryptohash.h> | |
24 | #include <linux/types.h> | |
25 | #include <crypto/sha.h> | |
26 | #include <crypto/sha1_base.h> | |
27 | #include <asm/byteorder.h> | |
28 | ||
29 | const u8 sha1_zero_message_hash[SHA1_DIGEST_SIZE] = { | |
30 | 0xda, 0x39, 0xa3, 0xee, 0x5e, 0x6b, 0x4b, 0x0d, | |
31 | 0x32, 0x55, 0xbf, 0xef, 0x95, 0x60, 0x18, 0x90, | |
32 | 0xaf, 0xd8, 0x07, 0x09 | |
33 | }; | |
34 | EXPORT_SYMBOL_GPL(sha1_zero_message_hash); | |
35 | ||
36 | static void sha1_generic_block_fn(struct sha1_state *sst, u8 const *src, | |
37 | int blocks) | |
38 | { | |
39 | u32 temp[SHA_WORKSPACE_WORDS]; | |
40 | ||
41 | while (blocks--) { | |
42 | sha_transform(sst->state, src, temp); | |
43 | src += SHA1_BLOCK_SIZE; | |
44 | } | |
45 | memzero_explicit(temp, sizeof(temp)); | |
46 | } | |
47 | ||
48 | int crypto_sha1_update(struct shash_desc *desc, const u8 *data, | |
49 | unsigned int len) | |
50 | { | |
51 | return sha1_base_do_update(desc, data, len, sha1_generic_block_fn); | |
52 | } | |
53 | EXPORT_SYMBOL(crypto_sha1_update); | |
54 | ||
55 | static int sha1_final(struct shash_desc *desc, u8 *out) | |
56 | { | |
57 | sha1_base_do_finalize(desc, sha1_generic_block_fn); | |
58 | return sha1_base_finish(desc, out); | |
59 | } | |
60 | ||
61 | int crypto_sha1_finup(struct shash_desc *desc, const u8 *data, | |
62 | unsigned int len, u8 *out) | |
63 | { | |
64 | sha1_base_do_update(desc, data, len, sha1_generic_block_fn); | |
65 | return sha1_final(desc, out); | |
66 | } | |
67 | EXPORT_SYMBOL(crypto_sha1_finup); | |
68 | ||
69 | static struct shash_alg alg = { | |
70 | .digestsize = SHA1_DIGEST_SIZE, | |
71 | .init = sha1_base_init, | |
72 | .update = crypto_sha1_update, | |
73 | .final = sha1_final, | |
74 | .finup = crypto_sha1_finup, | |
75 | .descsize = sizeof(struct sha1_state), | |
76 | .base = { | |
77 | .cra_name = "sha1", | |
78 | .cra_driver_name= "sha1-generic", | |
79 | .cra_flags = CRYPTO_ALG_TYPE_SHASH, | |
80 | .cra_blocksize = SHA1_BLOCK_SIZE, | |
81 | .cra_module = THIS_MODULE, | |
82 | } | |
83 | }; | |
84 | ||
85 | static int __init sha1_generic_mod_init(void) | |
86 | { | |
87 | return crypto_register_shash(&alg); | |
88 | } | |
89 | ||
90 | static void __exit sha1_generic_mod_fini(void) | |
91 | { | |
92 | crypto_unregister_shash(&alg); | |
93 | } | |
94 | ||
95 | module_init(sha1_generic_mod_init); | |
96 | module_exit(sha1_generic_mod_fini); | |
97 | ||
98 | MODULE_LICENSE("GPL"); | |
99 | MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm"); | |
100 | ||
101 | MODULE_ALIAS_CRYPTO("sha1"); | |
102 | MODULE_ALIAS_CRYPTO("sha1-generic"); |