1/* sha1.h
2
3 The sha1 hash function.
4
5 Copyright (C) 2001, 2012 Niels Möller
6
7 This file is part of GNU Nettle.
8
9 GNU Nettle is free software: you can redistribute it and/or
10 modify it under the terms of either:
11
12 * the GNU Lesser General Public License as published by the Free
13 Software Foundation; either version 3 of the License, or (at your
14 option) any later version.
15
16 or
17
18 * the GNU General Public License as published by the Free
19 Software Foundation; either version 2 of the License, or (at your
20 option) any later version.
21
22 or both in parallel, as here.
23
24 GNU Nettle is distributed in the hope that it will be useful,
25 but WITHOUT ANY WARRANTY; without even the implied warranty of
26 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
27 General Public License for more details.
28
29 You should have received copies of the GNU General Public License and
30 the GNU Lesser General Public License along with this program. If
31 not, see http://www.gnu.org/licenses/.
32*/
33
34#ifndef NETTLE_SHA1_H_INCLUDED
35#define NETTLE_SHA1_H_INCLUDED
36
37#include "nettle-types.h"
38
39#ifdef __cplusplus
40extern "C" {
41#endif
42
43/* Name mangling */
44#define sha1_init nettle_sha1_init
45#define sha1_update nettle_sha1_update
46#define sha1_digest nettle_sha1_digest
47
48/* SHA1 */
49
50#define SHA1_DIGEST_SIZE 20
51#define SHA1_BLOCK_SIZE 64
52/* For backwards compatibility */
53#define SHA1_DATA_SIZE SHA1_BLOCK_SIZE
54
55/* Digest is kept internally as 5 32-bit words. */
56#define _SHA1_DIGEST_LENGTH 5
57
58struct sha1_ctx
59{
60 uint32_t state[_SHA1_DIGEST_LENGTH]; /* State variables */
61 uint64_t count; /* 64-bit block count */
62 uint8_t block[SHA1_BLOCK_SIZE]; /* SHA1 data buffer */
63 unsigned int index; /* index into buffer */
64};
65
66void
67sha1_init(struct sha1_ctx *ctx);
68
69void
70sha1_update(struct sha1_ctx *ctx,
71 size_t length,
72 const uint8_t *data);
73
74void
75sha1_digest(struct sha1_ctx *ctx,
76 size_t length,
77 uint8_t *digest);
78
79/* Internal compression function. STATE points to 5 uint32_t words,
80 and DATA points to 64 bytes of input data, possibly unaligned. */
81void
82_nettle_sha1_compress(uint32_t *state, const uint8_t *data);
83
84#ifdef __cplusplus
85}
86#endif
87
88#endif /* NETTLE_SHA1_H_INCLUDED */
89