/*
 * The contents of this file are subject to the Mozilla Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/MPL/
 * 
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 * 
 * The Original Code is the Netscape security libraries.
 * 
 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation.  Portions created by Netscape are 
 * Copyright (C) 1994-2000 Netscape Communications Corporation.  All
 * Rights Reserved.
 * 
 * Contributor(s):
 * 
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License Version 2 or later (the
 * "GPL"), in which case the provisions of the GPL are applicable 
 * instead of those above.  If you wish to allow use of your 
 * version of this file only under the terms of the GPL and not to
 * allow others to use your version of this file under the MPL,
 * indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by
 * the GPL.  If you do not delete the provisions above, a recipient
 * may use your version of this file under either the MPL or the
 * GPL.
 *
 * $Id$
 */

#ifndef _RIJNDAEL_H_
#define _RIJNDAEL_H_ 1

#define RIJNDAEL_MIN_BLOCKSIZE 16 /* bytes */
#define RIJNDAEL_MAX_BLOCKSIZE 32 /* bytes */

typedef SECStatus AESFunc(AESContext *cx, unsigned char *output,
                          unsigned int *outputLen, unsigned int maxOutputLen,
                          const unsigned char *input, unsigned int inputLen, 
                          unsigned int blocksize);

typedef SECStatus AESBlockFunc(AESContext *cx, 
                               unsigned char *output,
                               const unsigned char *input);

/* AESContextStr
 *
 * Values which maintain the state for Rijndael encryption/decryption.
 *
 * iv          - initialization vector for CBC mode
 * Nb          - the number of bytes in a block, specified by user
 * Nr          - the number of rounds, specified by a table
 * expandedKey - the round keys in 4-byte words, the length is Nr * Nb
 * worker      - the encryption/decryption function to use with this context
 */
struct AESContextStr
{
    unsigned int   Nb;
    unsigned int   Nr;
    PRUint32      *expandedKey;
    AESFunc       *worker;
    unsigned char iv[RIJNDAEL_MAX_BLOCKSIZE];
};

/* RIJNDAEL_NUM_ROUNDS
 *
 * Number of rounds per execution
 * Nk - number of key bytes
 * Nb - blocksize (in bytes)
 */
#define RIJNDAEL_NUM_ROUNDS(Nk, Nb) \
    (PR_MAX(Nk, Nb) + 6)

/* RIJNDAEL_NUM_ROUNDS
 *
 * Maximum number of bytes in the state (spec includes up to 256-bit block
 * size)
 */
#define RIJNDAEL_MAX_STATE_SIZE 32

#endif /* _RIJNDAEL_H_ */