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/* aes.h
*
* The aes/rijndael block cipher.
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2001 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.
*/
#ifndef NETTLE_AES_H_INCLUDED
#define NETTLE_AES_H_INCLUDED
#include "nettle-types.h"
#ifdef __cplusplus
extern "C" {
#endif
/* Name mangling */
#define aes_set_encrypt_key nettle_aes_set_encrypt_key
#define aes_set_decrypt_key nettle_aes_set_decrypt_key
#define aes_invert_key nettle_aes_invert_key
#define aes_encrypt nettle_aes_encrypt
#define aes_decrypt nettle_aes_decrypt
#define AES_BLOCK_SIZE 16
/* Variable key size between 128 and 256 bits. But the only valid
* values are 16 (128 bits), 24 (192 bits) and 32 (256 bits). */
#define AES_MIN_KEY_SIZE 16
#define AES_MAX_KEY_SIZE 32
#define AES_KEY_SIZE 32
/* FIXME: Change to put nrounds first, to make it possible to use a
truncated ctx struct, with less subkeys, for the shorter key
sizes? */
struct aes_ctx
{
uint32_t keys[60]; /* maximum size of key schedule */
unsigned nrounds; /* number of rounds to use for our key size */
};
void
aes_set_encrypt_key(struct aes_ctx *ctx,
unsigned length, const uint8_t *key);
void
aes_set_decrypt_key(struct aes_ctx *ctx,
unsigned length, const uint8_t *key);
void
aes_invert_key(struct aes_ctx *dst,
const struct aes_ctx *src);
void
aes_encrypt(const struct aes_ctx *ctx,
unsigned length, uint8_t *dst,
const uint8_t *src);
void
aes_decrypt(const struct aes_ctx *ctx,
unsigned length, uint8_t *dst,
const uint8_t *src);
#ifdef __cplusplus
}
#endif
#endif /* NETTLE_AES_H_INCLUDED */
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