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1/* sha.h
2 *
3 * The sha1 and sha256 hash functions.
4 */
5
6/* nettle, low-level cryptographics library
7 *
8 * Copyright (C) 2001 Niels Möller
9 *
10 * The nettle library is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU Lesser General Public License as published by
12 * the Free Software Foundation; either version 2.1 of the License, or (at your
13 * option) any later version.
14 *
15 * The nettle library is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
17 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
18 * License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public License
21 * along with the nettle library; see the file COPYING.LIB. If not, write to
22 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
23 * MA 02111-1307, USA.
24 */
25
26#ifndef NETTLE_SHA_H_INCLUDED
27#define NETTLE_SHA_H_INCLUDED
28
29#include <inttypes.h>
30
31typedef uint32_t word32;
32typedef unsigned char byte;
33
34
35/* SHA256 */
36
37#define SHA256_DIGEST_SIZE 32
38#define SHA256_DATA_SIZE 64
39
40/* Digest is kept internally as 8 32-bit words. */
41#define _SHA256_DIGEST_LENGTH 8
42
43typedef struct sha256_ctx
44{
45 word32 state[_SHA256_DIGEST_LENGTH]; /* State variables */
46 word32 count_low, count_high; /* 64-bit block count */
47 byte block[SHA256_DATA_SIZE]; /* SHA256 data buffer */
48 unsigned int index; /* index into buffer */
49} SHA256_CTX;
50
51void
52sha256_init(struct sha256_ctx *ctx);
53
54void
55sha256_update(struct sha256_ctx *ctx, const byte *data, unsigned length);
56
57void
58sha256_final(struct sha256_ctx *ctx);
59
60void
61sha256_digest(const struct sha256_ctx *ctx, byte *digest);
62
63
64#endif /* NETTLE_SHA_H_INCLUDED */