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/* aes-set-decrypt-key.c
Inverse key setup for the aes/rijndael block cipher.
Copyright (C) 2000, 2001, 2002 Rafael R. Sevilla, Niels Möller
Copyright (C) 2013 Niels Möller
This file is part of GNU Nettle.
GNU Nettle is free software: you can redistribute it and/or
modify it under the terms of either:
* the GNU Lesser General Public License as published by the Free
Software Foundation; either version 3 of the License, or (at your
option) any later version.
or
* the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version.
or both in parallel, as here.
GNU Nettle 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
General Public License for more details.
You should have received copies of the GNU General Public License and
the GNU Lesser General Public License along with this program. If
not, see http://www.gnu.org/licenses/.
*/
#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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