3 * The sha1 and sha256 hash functions.
6 /* nettle, low-level cryptographics library
8 * Copyright (C) 2001 Niels Möller
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.
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.
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,
26 #ifndef NETTLE_SHA_H_INCLUDED
27 #define NETTLE_SHA_H_INCLUDED
31 typedef uint32_t word32;
32 typedef unsigned char byte;
37 #define SHA256_DIGEST_SIZE 32
38 #define SHA256_DATA_SIZE 64
40 /* Digest is kept internally as 8 32-bit words. */
41 #define _SHA256_DIGEST_LENGTH 8
43 typedef struct sha256_ctx
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 */
52 sha256_init(struct sha256_ctx *ctx);
55 sha256_update(struct sha256_ctx *ctx, const byte *data, unsigned length);
58 sha256_final(struct sha256_ctx *ctx);
61 sha256_digest(const struct sha256_ctx *ctx, byte *digest);
64 #endif /* NETTLE_SHA_H_INCLUDED */