chiark - git - mdw - catacomb/blob - mpreduce-exp.h

   1 /* -*-c-*-
   2  *
   3  * $Id: mpreduce-exp.h,v 1.2 2004/04/08 01:36:15 mdw Exp $
   4  *
   5  * Exponentiation operations for binary field reduction
   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 #ifndef CATACOMB_MPREDUCE_EXP_H
  31 #define CATACOMB_MPREDUCE_EXP_H
  32
  33 #ifdef __cplusplus
  34   extern "C" {
  35 #endif
  36
  37 /*----- Exponentiation definitions ----------------------------------------*/
  38
  39 #define EXP_TYPE mp *
  40
  41 #define EXP_COPY(d, x) d = MP_COPY(x)
  42 #define EXP_DROP(x) MP_DROP(x)
  43
  44 #define EXP_MUL(a, x) do {                                              \
  45   mp *t = mp_mul(spare, a, x);                                          \
  46   spare = a;                                                            \
  47   a = mpreduce_do(mr, t, t);                                            \
  48 } while (0)
  49
  50 #define EXP_SQR(a) do {                                                 \
  51   mp *t = mp_sqr(spare, a);                                             \
  52   spare = a;                                                            \
  53   a = mpreduce_do(mr, t, t);                                            \
  54 } while (0)
  55
  56 #define EXP_FIX(x)
  57
  58 #define EXP_SETMUL(d, x, y) do {                                        \
  59   d = mp_mul(MP_NEW, x, y);                                             \
  60   d = mpreduce_do(mr, d, d);                                            \
  61 } while (0)
  62
  63 #define EXP_SETSQR(d, x) do {                                           \
  64   d = mp_sqr(MP_NEW, x);                                                \
  65   d = mpreduce_do(mr, d, d);                                            \
  66 } while (0)
  67
  68 #include "exp.h"
  69
  70 /*----- That's all, folks -------------------------------------------------*/
  71
  72 #ifdef __cplusplus
  73   }
  74 #endif
  75
  76 #endif