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

   1 /* -*-c-*-
   2  *
   3  * $Id: ectab.h,v 1.2 2004/04/01 12:50:09 mdw Exp $
   4  *
   5  * Table of standard elliptic curves
   6  *
   7  * (c) 2004 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: ectab.h,v $
  33  * Revision 1.2  2004/04/01 12:50:09  mdw
  34  * Add cyclic group abstraction, with test code.  Separate off exponentation
  35  * functions for better static linking.  Fix a buttload of bugs on the way.
  36  * Generally ensure that negative exponents do inversion correctly.  Add
  37  * table of standard prime-field subgroups.  (Binary field subgroups are
  38  * currently unimplemented but easy to add if anyone ever finds a good one.)
  39  *
  40  * Revision 1.1  2004/03/27 17:54:11  mdw
  41  * Standard curves and curve checking.
  42  *
  43  */
  44
  45 #ifndef CATACOMB_ECTAB_H
  46 #define CATACOMB_ECTAB_H
  47
  48 #ifdef __cplusplus
  49   extern "C" {
  50 #endif
  51
  52 /*----- Header files ------------------------------------------------------*/
  53
  54 #include "ec.h"
  55
  56 /*----- Data structures ---------------------------------------------------*/
  57
  58 typedef struct ecdata {
  59   unsigned ftag;                        /* The kind of curve this is */
  60   mp p;                                 /* Modulus */
  61   mp a, b;                              /* Elliptic curve parameters */
  62   mp r;                                 /* Order of common point %$g$% */
  63   mp h;                                 /* Cofactor %$h = \#E/r$% */
  64   mp gx, gy;                            /* Common point */
  65 } ecdata;
  66
  67 enum {
  68   FTAG_PRIME,                           /* Prime but not nice */
  69   FTAG_NICEPRIME,                       /* Nice prime field */
  70   FTAG_BINPOLY                          /* Any old binary field */
  71 };
  72
  73 typedef struct ecentry {
  74   const char *name;
  75   ecdata *data;
  76 } ecentry;
  77
  78 /*----- Global variables --------------------------------------------------*/
  79
  80 extern const ecentry ectab[];
  81
  82 /*----- That's all, folks -------------------------------------------------*/
  83
  84 #ifdef __cplusplus
  85   }
  86 #endif
  87
  88 #endif