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/* aes-set-decrypt-key.c
*
* Inverse key setup for the aes/rijndael block cipher.
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2000, 2001, 2002 Rafael R. Sevilla, Niels Möller
* Copyright (C) 2013 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., 51 Franklin Street, Fifth Floor, Boston,
* MA 02111-1301, USA.
*/
/* Originally written by Rafael R. Sevilla <dido@pacific.net.ph> */
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include "aes-internal.h"
void
aes_invert_key(struct aes_ctx *dst,
const struct aes_ctx *src)
{
_aes_invert (src->rounds, dst->keys, src->keys);
dst->rounds = src->rounds;
}
void
aes_set_decrypt_key(struct aes_ctx *ctx,
size_t keysize, const uint8_t *key)
{
/* We first create subkeys for encryption,
* then modify the subkeys for decryption. */
aes_set_encrypt_key(ctx, keysize, key);
aes_invert_key(ctx, ctx);
}
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