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

   1 /* -*-c-*-
   2  *
   3  * Exponentiation operations for binary field reduction
   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_GFREDUCE_EXP_H
  29 #define CATACOMB_GFREDUCE_EXP_H
  30
  31 #ifdef __cplusplus
  32   extern "C" {
  33 #endif
  34
  35 /*----- Exponentiation definitions ----------------------------------------*/
  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 = gf_mul(spare, a, x);                                          \
  44   spare = a;                                                            \
  45   a = gfreduce_do(gr, t, t);                                            \
  46 } while (0)
  47
  48 #define EXP_SQR(a) do {                                                 \
  49   mp *t = gf_sqr(spare, a);                                             \
  50   spare = a;                                                            \
  51   a = gfreduce_do(gr, t, t);                                            \
  52 } while (0)
  53
  54 #define EXP_FIX(x)
  55
  56 #define EXP_SETMUL(d, x, y) do {                                        \
  57   d = gf_mul(MP_NEW, x, y);                                             \
  58   d = gfreduce_do(gr, d, d);                                            \
  59 } while (0)
  60
  61 #define EXP_SETSQR(d, x) do {                                           \
  62   d = gf_sqr(MP_NEW, x);                                                \
  63   d = gfreduce_do(gr, d, d);                                            \
  64 } while (0)
  65
  66 #include "exp.h"
  67
  68 /*----- That's all, folks -------------------------------------------------*/
  69
  70 #ifdef __cplusplus
  71   }
  72 #endif
  73
  74 #endif