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