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/* umac-nh.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 "umac.h"
#include "macros.h"
uint64_t
_umac_nh (const uint32_t *key, unsigned length, const uint8_t *msg)
{
uint64_t y;
assert (length > 0);
assert (length <= 1024);
assert (length % 32 == 0);
for (y = 0; length > 0; length -= 32, msg += 32, key += 8)
{
uint32_t a, b;
a = LE_READ_UINT32 (msg) + key[0];
b = LE_READ_UINT32 (msg + 16) + key[4];
y += (uint64_t) a * b;
a = LE_READ_UINT32 (msg + 4) + key[1];
b = LE_READ_UINT32 (msg + 20) + key[5];
y += (uint64_t) a * b;
a = LE_READ_UINT32 (msg + 8) + key[2];
b = LE_READ_UINT32 (msg + 24) + key[6];
y += (uint64_t) a * b;
a = LE_READ_UINT32 (msg + 12) + key[3];
b = LE_READ_UINT32 (msg + 28) + key[7];
y += (uint64_t) a * b;
}
return y;
}
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