1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
|
/* umac-nh-n.c
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2013 Niels Möller
*
* The nettle library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* The nettle library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the nettle library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02111-1301, USA.
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include <assert.h>
#include <string.h>
#include "umac.h"
#include "macros.h"
void
_umac_nh_n (uint64_t *out, unsigned n, const uint32_t *key,
unsigned length, const uint8_t *msg)
{
assert (length > 0);
assert (length <= 1024);
assert (length % 32 == 0);
memset(out, 0, n*sizeof(*out));
for (;length > 0; length -= 32, msg += 32, key += 8)
{
uint32_t a0, a1, b0, b1;
unsigned i;
a0 = LE_READ_UINT32 (msg);
a1 = LE_READ_UINT32 (msg + 4);
b0 = LE_READ_UINT32 (msg + 16);
b1 = LE_READ_UINT32 (msg + 20);
for (i = 0; i < n; i++)
out[i] += (uint64_t) (a0 + key[0+4*i]) * (b0 + key[4+4*i])
+ (uint64_t) (a1 + key[1+4*i]) * (b1 + key[5+4*i]);
a0 = LE_READ_UINT32 (msg + 8);
a1 = LE_READ_UINT32 (msg + 12);
b0 = LE_READ_UINT32 (msg + 24);
b1 = LE_READ_UINT32 (msg + 28);
for (i = 0; i < n; i++)
out[i] += (uint64_t) (a0 + key[2+4*i]) * (b0 + key[6+4*i])
+ (uint64_t) (a1 + key[3+4*i]) * (b1 + key[7+4*i]);
}
}
|
