/*	$OpenBSD: math_group.h,v 1.5 1999/04/19 20:00:24 niklas Exp $	*/
/*	$EOM: math_group.h,v 1.7 1999/04/17 23:20:40 niklas Exp $	*/

/*
 * Copyright (c) 1998 Niels Provos.  All rights reserved.
 * Copyright (c) 1999 Niklas Hallqvist.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by Ericsson Radio Systems.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * This code was written under funding by Ericsson Radio Systems.
 */

#ifndef _MATH_GROUP_H_
#define _MATH_GROUP_H_

enum groups {
  MODP,				/* F_p, Z modulo a prime */
  EC2N,				/* Elliptic Curve over the Field GF(2**N) */
  ECP,				/* Elliptic Curve over the Field Z_p */
};

/*
 * The group on which diffie hellmann calculations are done.
 */

struct group {
  enum groups type;
  int id;			/* Group ID */
  int bits;			/* Number of key bits provided by this group */
  void *group;
  void *a, *b, *c, *d;
  void *gen;			/* Group Generator */
  int (*getlen) (struct group *);
  void (*getraw) (struct group *, void *, u_int8_t *);
  int (*setraw) (struct group *, void *, u_int8_t *, int);
  int (*setrandom) (struct group *, void *);
  int (*operation) (struct group *, void *, void *, void *);
};

/* Description of an Elliptic Group over GF(2**n) for Boot-Strapping */

struct ec2n_dscr {
  int id;
  int bits;				/* Key Bits provided by this group */
  char *polynomial;			/* Irreduceable polynomial */
  char *gen_x;				/* X - Coord. of Generator */
  char *a, *b;				/* Curve Parameters */
};

/* Description of F_p for Boot-Strapping */

struct modp_dscr {
  int id;
  int bits;				/* Key Bits provided by this group */
  char *prime;				/* Prime */
  char *gen;				/* Generator */
};

/* Prototypes */

void group_init (void);
void group_free (struct group *);
struct group *group_get (int);

void ec2n_free (struct group *);
struct group *ec2n_clone (struct group *, struct group *);
void ec2n_init (struct group *);

void modp_free (struct group *);
struct group *modp_clone (struct group *, struct group *);
void modp_init (struct group *);

#endif /* _MATH_GROUP_H_ */