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/* camellia-set-decrypt-key.c
*
* Inverse key setup for the camellia block cipher.
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2010 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., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include "camellia.h"
#define SWAP(a, b) \
do { uint64_t t_swap = (a); (a) = (b); (b) = t_swap; } while(0)
void
camellia_invert_key(struct camellia_ctx *dst,
const struct camellia_ctx *src)
{
unsigned nkeys = src->nkeys;
unsigned i;
if (dst == src)
{
for (i = 0; i < nkeys - 1 - i; i++)
SWAP(dst->keys[i], dst->keys[nkeys - 1 - i]);
}
else
{
dst->nkeys = nkeys;
for (i = 0; i < nkeys; i++)
dst->keys[i] = src->keys[nkeys - 1 - i];
}
}
void
camellia_set_decrypt_key(struct camellia_ctx *ctx,
unsigned length, const uint8_t *key)
{
camellia_set_encrypt_key(ctx, length, key);
camellia_invert_key(ctx, ctx);
}
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