]>
git.ipfire.org Git - thirdparty/nettle.git/blob - sha1.c
3 The sha1 hash function.
4 Defined by http://www.itl.nist.gov/fipspubs/fip180-1.htm.
6 Copyright (C) 2001, 2013 Niels Möller
8 This file is part of GNU Nettle.
10 GNU Nettle is free software: you can redistribute it and/or
11 modify it under the terms of either:
13 * the GNU Lesser General Public License as published by the Free
14 Software Foundation; either version 3 of the License, or (at your
15 option) any later version.
19 * the GNU General Public License as published by the Free
20 Software Foundation; either version 2 of the License, or (at your
21 option) any later version.
23 or both in parallel, as here.
25 GNU Nettle is distributed in the hope that it will be useful,
26 but WITHOUT ANY WARRANTY; without even the implied warranty of
27 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
28 General Public License for more details.
30 You should have received copies of the GNU General Public License and
31 the GNU Lesser General Public License along with this program. If
32 not, see http://www.gnu.org/licenses/.
46 #include "nettle-write.h"
48 /* Initialize the SHA values */
50 sha1_init(struct sha1_ctx
*ctx
)
52 /* FIXME: Put the buffer last in the struct, and arrange so that we
53 can initialize with a single memcpy. */
54 static const uint32_t iv
[_SHA1_DIGEST_LENGTH
] =
56 /* SHA initial values, first 4 identical to md5's. */
64 memcpy(ctx
->state
, iv
, sizeof(ctx
->state
));
67 /* Initialize buffer */
71 #define COMPRESS(ctx, data) (nettle_sha1_compress((ctx)->state, data))
74 sha1_update(struct sha1_ctx
*ctx
,
75 size_t length
, const uint8_t *data
)
77 MD_UPDATE (ctx
, length
, data
, COMPRESS
, ctx
->count
++);
81 sha1_digest(struct sha1_ctx
*ctx
,
87 assert(length
<= SHA1_DIGEST_SIZE
);
89 MD_PAD(ctx
, 8, COMPRESS
);
91 /* There are 512 = 2^9 bits in one block */
92 bit_count
= (ctx
->count
<< 9) | (ctx
->index
<< 3);
94 /* append the 64 bit count */
95 WRITE_UINT64(ctx
->block
+ (SHA1_BLOCK_SIZE
- 8), bit_count
);
96 nettle_sha1_compress(ctx
->state
, ctx
->block
);
98 _nettle_write_be32(length
, digest
, ctx
->state
);