git.distorted.org.uk Git - u/mdw/catacomb/blob - dh.h

   1 /* -*-c-*-
   2  *
   3  * $Id: dh.h,v 1.4 2000/06/17 10:52:47 mdw Exp $
   4  *
   5  * Diffie-Hellman and related public-key systems
   6  *
   7  * (c) 1999 Straylight/Edgeware
   8  */
   9
  10 /*----- Licensing notice --------------------------------------------------*
  11  *
  12  * This file is part of Catacomb.
  13  *
  14  * Catacomb is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU Library General Public License as
  16  * published by the Free Software Foundation; either version 2 of the
  17  * License, or (at your option) any later version.
  18  *
  19  * Catacomb is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU Library General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU Library General Public
  25  * License along with Catacomb; if not, write to the Free
  26  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  27  * MA 02111-1307, USA.
  28  */
  29
  30 /*----- Revision history --------------------------------------------------*
  31  *
  32  * $Log: dh.h,v $
  33  * Revision 1.4  2000/06/17 10:52:47  mdw
  34  * Minor changes for key fetching.
  35  *
  36  * Revision 1.3  2000/02/12 18:21:02  mdw
  37  * Overhaul of key management (again).
  38  *
  39  */
  40
  41 #ifndef CATACOMB_DH_H
  42 #define CATACOMB_DH_H
  43
  44 #ifdef __cplusplus
  45   extern "C" {
  46 #endif
  47
  48 /*----- Header files ------------------------------------------------------*/
  49
  50 #ifndef CATACOMB_GRAND_H
  51 #  include "grand.h"
  52 #endif
  53
  54 #ifndef CATACOMB_KEY_H
  55 #  include "key.h"
  56 #endif
  57
  58 #ifndef CATACOMB_PGEN_H
  59 #  include "pgen.h"
  60 #endif
  61
  62 /*----- Data structures ---------------------------------------------------*/
  63
  64 typedef struct dh_param {
  65   mp *p, *q;
  66   mp *g;
  67 } dh_param;
  68
  69 typedef struct dh_pub {
  70   dh_param dp;
  71   mp *y;
  72 } dh_pub;
  73
  74 typedef struct dh_priv {
  75   dh_param dp;
  76   mp *x;
  77   mp *y;
  78 } dh_priv;
  79
  80 /*----- Key fetching ------------------------------------------------------*/
  81
  82 extern const key_fetchdef dh_paramfetch[];
  83 #define DH_PARAMFETCHSZ 5
  84
  85 extern const key_fetchdef dh_pubfetch[];
  86 #define DH_PUBFETCHSZ 6
  87
  88 extern const key_fetchdef dh_privfetch[];
  89 #define DH_PRIVFETCHSZ 9
  90
  91 /*----- Functions provided ------------------------------------------------*/
  92
  93 /* --- @dh_gen@ --- *
  94  *
  95  * Arguments:   @dh_param *dp@ = pointer to output parameter block
  96  *              @unsigned ql@ = length of %$q$% in bits, or zero
  97  *              @unsigned pl@ = length of %$p$% in bits
  98  *              @unsigned steps@ = number of steps to go
  99  *              @grand *r@ = random number source
 100  *              @pgen_proc *event@ = event handler function
 101  *              @void *ectx@ = argument for the event handler
 102  *
 103  * Returns:     @PGEN_DONE@ if it worked, @PGEN_ABORT@ if it didn't.
 104  *
 105  * Use:         Generates Diffie-Hellman parameters.
 106  *
 107  *              The parameters are a prime %$q$%, relatively small, and a
 108  *              large prime %$p = kq + 1$% for some %$k$%, together with a
 109  *              generator %$g$% of the cyclic subgroup of order %$q$%.  These
 110  *              are actually the same as the DSA parameter set, but the
 111  *              generation algorithm is different.  Also, if @ql@ is zero,
 112  *              this algorithm forces %$k = 2$%, and chooses %$g = 4$%.  Make
 113  *              sure you have something interesting to do if you choose this
 114  *              option.
 115  */
 116
 117 extern int dh_gen(dh_param */*dp*/, unsigned /*ql*/, unsigned /*pl*/,
 118                   unsigned /*steps*/, grand */*r*/, pgen_proc */*event*/,
 119                   void */*ectx*/);
 120
 121 /*----- That's all, folks -------------------------------------------------*/
 122
 123 #ifdef __cplusplus
 124   }
 125 #endif
 126
 127 #endif