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/*
*****************************************************************************
*
* File: rigndael.c
*
* Purpose: rijndael - An implementation of the Rijndael cipher.
*
* Copyright (C) 2000, 2001 Rafael R. Sevilla <sevillar@team.ph.inter.net>
*
* Currently maintained by brian d foy, <bdfoy@cpan.org>
*
* License (GNU Public License):
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of 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.
*
* This program 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 a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
*****************************************************************************
*/
/*
* Rijndael is a 128/192/256-bit block cipher that accepts key sizes of
* 128, 192, or 256 bits, designed by Joan Daemen and Vincent Rijmen. See
* http://www.esat.kuleuven.ac.be/~rijmen/rijndael/ for details.
*/

#ifndef RIJNDAEL_H
#define RIJNDAEL_H 1

#include "fko_common.h"

/* Other block sizes and key lengths are possible, but in the context of
* the ssh protocols, 256 bits is the default.
*/
#define RIJNDAEL_BLOCKSIZE 16
#define RIJNDAEL_KEYSIZE 32

#define MODE_ECB 1 /* Are we ciphering in ECB mode? */
#define MODE_CBC 2 /* Are we ciphering in CBC mode? */
#define MODE_CFB 3 /* Are we ciphering in 128-bit CFB mode? */
#define MODE_PCBC 4 /* Are we ciphering in PCBC mode? */
#define MODE_OFB 5 /* Are we ciphering in 128-bit OFB mode? */
#define MODE_CTR 6 /* Are we ciphering in counter mode? */

/* Allow keys of size 128 <= bits <= 256 */

#define RIJNDAEL_MIN_KEYSIZE 16
#define RIJNDAEL_MAX_KEYSIZE 32

typedef struct {
  uint32_t keys[60]; /* maximum size of key schedule */
  uint32_t ikeys[60]; /* inverse key schedule */
  int nrounds; /* number of rounds to use for our key size */
  int mode; /* encryption mode */
  /* Added by DSS */
  uint8_t key[32];
  uint8_t iv[16];
  uint8_t salt[8];
} RIJNDAEL_context;

/* This basically performs Rijndael's key scheduling algorithm, as it's the
* only initialization required anyhow. The key size is specified in bytes,
* but the only valid values are 16 (128 bits), 24 (192 bits), and 32 (256
* bits). If a value other than these three is specified, the key will be
* truncated to the closest value less than the key size specified, e.g.
* specifying 7 will use only the first 6 bytes of the key given. DO NOT
* PASS A VALUE LESS THAN 16 TO KEYSIZE!
*/
void
rijndael_setup(RIJNDAEL_context *ctx, size_t keysize, const uint8_t *key);

/*
* rijndael_encrypt()
*
* Encrypt 16 bytes of data with the Rijndael algorithm. Before this
* function can be used, rijndael_setup must be used in order to initialize
* Rijndael's key schedule.
*
* This function always encrypts 16 bytes of plaintext to 16 bytes of
* ciphertext. The memory areas of the plaintext and the ciphertext can
* overlap.
*/

void
rijndael_encrypt(RIJNDAEL_context *context,
const uint8_t *plaintext,
uint8_t *ciphertext);

/*
* rijndael_decrypt()
*
* Decrypt 16 bytes of data with the Rijndael algorithm.
*
* Before this function can be used, rijndael_setup() must be used in order
* to set up the key schedule required for the decryption algorithm.
*
* This function always decrypts 16 bytes of ciphertext to 16 bytes of
* plaintext. The memory areas of the plaintext and the ciphertext can
* overlap.
*/

void
rijndael_decrypt(RIJNDAEL_context *context,
const uint8_t *ciphertext,
uint8_t *plaintext);

/* Encrypt a block of plaintext in a mode specified in the context */
void
block_encrypt(RIJNDAEL_context *ctx, uint8_t *input, int inputlen,
uint8_t *output, uint8_t *iv);

/* Decrypt a block of plaintext in a mode specified in the context */
void
block_decrypt(RIJNDAEL_context *ctx, uint8_t *input, int inputlen,
uint8_t *output, uint8_t *iv);

#endif /* RIJNDAEL_H */
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