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

   1 /* -*-c-*-
   2  *
   3  * Exponentiation for large integers
   4  *
   5  * (c) 2004 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_MP_EXP_H
  29 #define CATACOMB_MP_EXP_H
  30
  31 #ifdef __cplusplus
  32   extern "C" {
  33 #endif
  34
  35 /*----- Exponentiation ----------------------------------------------------*/
  36
  37 #define EXP_TYPE mp *
  38
  39 #define EXP_COPY(d, x) d = MP_COPY(x)
  40 #define EXP_DROP(x) MP_DROP(x)
  41
  42 #define EXP_MUL(a, x) do {                                              \
  43   mp *t = mp_mul(spare, a, x);                                          \
  44   spare = a;                                                            \
  45   a = t;                                                                \
  46 } while (0)
  47
  48 #define EXP_SQR(a) do {                                                 \
  49   mp *t = mp_sqr(spare, a);                                             \
  50   spare = a;                                                            \
  51   a = t;                                                                \
  52 } while (0)
  53
  54 #define EXP_FIX(x)
  55
  56 #define EXP_SETMUL(d, x, y) d = mp_mul(MP_NEW, x, y)
  57 #define EXP_SETSQR(d, x) d = mp_sqr(MP_NEW, x)
  58
  59 #include "exp.h"
  60
  61 /*----- That's all, folks -------------------------------------------------*/
  62
  63 #ifdef __cplusplus
  64   }
  65 #endif
  66
  67 #endif