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

   1 /* -*-c-*-
   2  *
   3  * Exponentiation operations for elliptic curves
   4  *
   5  * (c) 2001 Straylight/Edgeware
   6  */
   7
   8 /*----- Licensing notice --------------------------------------------------*
   9  *
  10  * This file is part of Catacomb.
  11  *
  12  * Catacomb is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU Library General Public License as
  14  * published by the Free Software Foundation; either version 2 of the
  15  * License, or (at your option) any later version.
  16  *
  17  * Catacomb is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU Library General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU Library General Public
  23  * License along with Catacomb; if not, write to the Free
  24  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  25  * MA 02111-1307, USA.
  26  */
  27
  28 #ifndef CATACOMB_EC_EXP_H
  29 #define CATACOMB_EC_EXP_H
  30
  31 #ifdef __cplusplus
  32   extern "C" {
  33 #endif
  34
  35 /*----- Exponentation definitions -----------------------------------------*/
  36
  37 #define EXP_TYPE ec
  38
  39 #define EXP_COPY(d, p) do {                                             \
  40   if (EC_ATINF(&(p)))                                                   \
  41     (d).x = (d).y = (d).z = MP_NEW;                                     \
  42   else {                                                                \
  43     (d).x = MP_COPY((p).x);                                             \
  44     (d).y = MP_COPY((p).y);                                             \
  45     (d).z = (p).z ? MP_COPY((p).z) : MP_NEW;                            \
  46   }                                                                     \
  47 } while (0)
  48 #define EXP_DROP(x) EC_DESTROY(&(x))
  49
  50 #define EXP_MUL(a, x) EC_ADD(c, &(a), &(a), &(x))
  51 #define EXP_SQR(a) EC_DBL(c, &(a), &(a))
  52 #define EXP_FIX(x)
  53
  54 #define EXP_SETMUL(d, x, y) do {                                        \
  55   EC_CREATE(&(d));                                                      \
  56   EC_ADD(c, &(d), &(x), &(y));                                          \
  57 } while (0)
  58 #define EXP_SETSQR(d, x) do {                                           \
  59   EC_CREATE(&(d));                                                      \
  60   EC_DBL(c, &(d), &(x));                                                \
  61 } while (0)
  62
  63 #include "exp.h"
  64
  65 /*----- That's all, folks -------------------------------------------------*/
  66
  67 #ifdef __cplusplus
  68   }
  69 #endif
  70
  71 #endif