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

   1 /* -*-c-*-
   2  *
   3  * $Id: ec-exp.h,v 1.5 2004/04/03 03:32:05 mdw Exp $
   4  *
   5  * Exponentiation operations for elliptic curves
   6  *
   7  * (c) 2001 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: ec-exp.h,v $
  33  * Revision 1.5  2004/04/03 03:32:05  mdw
  34  * General robustification.
  35  *
  36  * Revision 1.4  2004/03/22 02:19:10  mdw
  37  * Rationalise the sliding-window threshold.  Drop guarantee that right
  38  * arguments to EC @add@ are canonical, and fix up projective implementations
  39  * to cope.
  40  *
  41  * Revision 1.3  2004/03/21 22:52:06  mdw
  42  * Merge and close elliptic curve branch.
  43  *
  44  * Revision 1.2.4.1  2004/03/20 00:13:31  mdw
  45  * Projective coordinates for prime curves
  46  *
  47  * Revision 1.2  2003/05/15 23:25:59  mdw
  48  * Make elliptic curve stuff build.
  49  *
  50  * Revision 1.1  2002/01/13 13:48:44  mdw
  51  * Further progress.
  52  *
  53  */
  54
  55 #ifndef CATACOMB_EC_EXP_H
  56 #define CATACOMB_EC_EXP_H
  57
  58 #ifdef __cplusplus
  59   extern "C" {
  60 #endif
  61
  62 /*----- Exponentation definitions -----------------------------------------*/
  63
  64 #define EXP_TYPE ec
  65
  66 #define EXP_COPY(d, p) do {                                             \
  67   (d).x = MP_COPY((p).x);                                               \
  68   (d).y = MP_COPY((p).y);                                               \
  69   (d).z = (p).z ? MP_COPY((p).z) : MP_NEW;                              \
  70 } while (0)
  71 #define EXP_DROP(x) EC_DESTROY(&(x))
  72
  73 #define EXP_MUL(a, x) EC_ADD(c, &(a), &(a), &(x))
  74 #define EXP_SQR(a) EC_DBL(c, &(a), &(a))
  75 #define EXP_FIX(x)
  76
  77 #define EXP_SETMUL(d, x, y) do {                                        \
  78   EC_CREATE(&(d));                                                      \
  79   EC_ADD(c, &(d), &(x), &(y));                                          \
  80 } while (0)
  81 #define EXP_SETSQR(d, x) do {                                           \
  82   EC_CREATE(&(d));                                                      \
  83   EC_DBL(c, &(d), &(x));                                                \
  84 } while (0)
  85
  86 #include "exp.h"
  87
  88 /*----- That's all, folks -------------------------------------------------*/
  89
  90 #ifdef __cplusplus
  91   }
  92 #endif
  93
  94 #endif