math_group.h

   1 /* borrowed from isakmpd-20030718 (-; */
   2
   3 /*      $OpenBSD: math_group.h,v 1.7 2003/06/03 14:28:16 ho Exp $       */
   4 /*      $EOM: math_group.h,v 1.7 1999/04/17 23:20:40 niklas Exp $       */
   5
   6 /*
   7  * Copyright (c) 1998 Niels Provos.  All rights reserved.
   8  * Copyright (c) 1999 Niklas Hallqvist.  All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 /*
  32  * This code was written under funding by Ericsson Radio Systems.
  33  */
  34
  35 #ifndef __MATH_GROUP_H__
  36 #define __MATH_GROUP_H__
  37
  38 #include <gcrypt.h>
  39
  40 enum groups {
  41         MODP  /* F_p, Z modulo a prime */
  42 };
  43
  44 #define OAKLEY_GRP_1    1
  45 #define OAKLEY_GRP_2    2
  46 #define OAKLEY_GRP_5    3
  47
  48 /*
  49  * The group on which diffie hellmann calculations are done.
  50  */
  51
  52 /* Description of F_p for Boot-Strapping */
  53
  54 struct modp_dscr {
  55         int id;
  56         int bits; /* Key Bits provided by this group */
  57         const char *prime; /* Prime */
  58         const char *gen; /* Generator */
  59 };
  60
  61 struct modp_group {
  62         gcry_mpi_t gen; /* Generator */
  63         gcry_mpi_t p; /* Prime */
  64         gcry_mpi_t a, b, c, d;
  65 };
  66
  67 struct group {
  68         enum groups type;
  69         int id; /* Group ID */
  70         int bits; /* Number of key bits provided by this group */
  71         struct modp_group *group;
  72         const struct modp_dscr *group_dscr;
  73         void *a, *b, *c, *d;
  74         void *gen; /* Group Generator */
  75         int (*getlen) (struct group *);
  76         void (*getraw) (struct group *, void *, unsigned char *);
  77         int (*setraw) (struct group *, void *, unsigned char *, int);
  78         int (*setrandom) (struct group *, void *);
  79         int (*operation) (struct group *, void *, void *, void *);
  80 };
  81
  82 /* Prototypes */
  83
  84 void group_init(void);
  85 void group_free(struct group *);
  86 struct group *group_get(int);
  87
  88 #endif /* _MATH_GROUP_H_ */