3 /* nettle, low-level cryptographics library
5 * Copyright (C) 2013 Niels Möller
7 * The nettle library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published by
9 * the Free Software Foundation; either version 2.1 of the License, or (at your
10 * option) any later version.
12 * The nettle library is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
15 * License for more details.
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with the nettle library; see the file COPYING.LIB. If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
23 /* Development of Nettle's ECC support was funded by the .SE Internet Fund. */
31 #include "ecc-internal.h"
33 /* Copy the k'th element of the table out tn elements, each of size
34 rn. Always read complete table. Similar to gmp's mpn_tabselect. */
35 /* FIXME: Should we need to volatile declare anything? */
37 sec_tabselect (mp_limb_t *rp, mp_size_t rn,
38 const mp_limb_t *table, unsigned tn,
41 const mp_limb_t *end = table + tn * rn;
47 for (p = table; p < end; p += rn, k--)
49 mp_limb_t mask = - (mp_limb_t) (k == 0);
50 for (i = 0; i < rn; i++)