/* umac-nh-n.c

   Copyright (C) 2013 Niels Möller

   This file is part of GNU Nettle.

   GNU Nettle is free software: you can redistribute it and/or

   modify it under the terms of either:

     * the GNU Lesser General Public License as published by the Free

       Software Foundation; either version 3 of the License, or (at your

       option) any later version.

   or

     * the GNU General Public License as published by the Free

       Software Foundation; either version 2 of the License, or (at your

       option) any later version.

   or both in parallel, as here.

   GNU Nettle 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

   General Public License for more details.

   You should have received copies of the GNU General Public License and

   the GNU Lesser General Public License along with this program.  If

   not, see http://www.gnu.org/licenses/.

*/

#if HAVE_CONFIG_H

# include "config.h"

#endif

#include <assert.h>

#include <string.h>

#include "umac.h"

#include "umac-internal.h"

#include "macros.h"

/* For fat builds */

#if HAVE_NATIVE_umac_nh_n

void

_nettle_umac_nh_n_c (uint64_t *out, unsigned n, const uint32_t *key,

         unsigned length, const uint8_t *msg);

#define _nettle_umac_nh_n _nettle_umac_nh_n_c

#endif

void

_nettle_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]);      

    }

}