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55 lines
1.5 KiB
C
55 lines
1.5 KiB
C
/* camellia-invert-key.c
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Inverting a key means reversing order of subkeys.
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Copyright (C) 2010 Niels Möller
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This file is part of GNU Nettle.
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GNU Nettle is free software: you can redistribute it and/or
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modify it under the terms of either:
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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or both in parallel, as here.
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GNU Nettle is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see http://www.gnu.org/licenses/.
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*/
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#if HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include "camellia-internal.h"
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#define SWAP(a, b) \
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do { uint64_t t_swap = (a); (a) = (b); (b) = t_swap; } while(0)
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void
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_nettle_camellia_invert_key(unsigned nkeys,
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uint64_t *dst, const uint64_t *src)
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{
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unsigned i;
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if (dst == src)
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for (i = 0; i < nkeys - 1 - i; i++)
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SWAP (dst[i], dst[nkeys - 1- i]);
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else
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for (i = 0; i < nkeys; i++)
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dst[i] = src[nkeys - 1 - i];
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}
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