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/* aes-internal.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., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*/
#ifndef NETTLE_AES_INTERNAL_H_INCLUDED
#define NETTLE_AES_INTERNAL_H_INCLUDED
#include "aes.h"
/* Define to use only small tables. */
#ifndef AES_SMALL
# define AES_SMALL 0
#endif
#if AES_SMALL
# define AES_TABLE_SIZE 1
#else
# define AES_TABLE_SIZE 4
#endif
/* Name mangling */
#define _aes_crypt _nettle_aes_crypt
/* Assembler code using the table should get link errors if linked
* against a small table. */
#if AES_SMALL
# define _aes_encrypt_table _nettle_aes_encrypt_table_small
# define _aes_decrypt_table _nettle_aes_decrypt_table_small
#else
# define _aes_encrypt_table _nettle_aes_encrypt_table
# define _aes_decrypt_table _nettle_aes_decrypt_table
#endif
struct aes_table
{
uint8_t sbox[0x100];
unsigned idx[3][4];
/* Variant of the idx array suitable for the sparc
* assembler code.
*
* sparc_idx[0][i] = idx[0][i] * 4 + 2
* sparc_idx[1][i] = idx[2][i] * 4
*/
unsigned sparc_idx [2][4];
uint32_t table[AES_TABLE_SIZE][0x100];
};
void
_aes_crypt(const struct aes_ctx *ctx,
const struct aes_table *T,
unsigned length, uint8_t *dst,
const uint8_t *src);
/* Macros */
#define ROTBYTE(x) (((x) >> 8) | (((x) & 0xff) << 24))
#define ROTRBYTE(x) (((x) << 8) | (((x) >> 24) & 0xff))
#define SUBBYTE(x, box) (((box)[((x) & 0xff)]) | \
((box)[(((x) >> 8) & 0xff)] << 8) | \
((box)[(((x) >> 16) & 0xff)] << 16) | \
((box)[(((x) >> 24) & 0xff)] << 24))
/* Internal tables */
extern const struct aes_table _aes_encrypt_table;
extern const struct aes_table _aes_decrypt_table;
#define aes_sbox (_aes_encrypt_table.sbox)
#endif /* NETTLE_AES_INTERNAL_H_INCLUDED */
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