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

   1 /* -*-c-*-
   2  *
   3  * $Id: mpmont-exp.h,v 1.2 2004/03/21 22:52:06 mdw Exp $
   4  *
   5  * Exponentiation operations for Montgomery reduction
   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: mpmont-exp.h,v $
  33  * Revision 1.2  2004/03/21 22:52:06  mdw
  34  * Merge and close elliptic curve branch.
  35  *
  36  * Revision 1.1.4.1  2004/03/20 00:13:31  mdw
  37  * Projective coordinates for prime curves
  38  *
  39  * Revision 1.1  2001/06/16 12:58:12  mdw
  40  * Parameters for generic exponentiation.
  41  *
  42  */
  43
  44 #ifndef CATACOMB_MPMONT_EXP_H
  45 #define CATACOMB_MPMONT_EXP_H
  46
  47 #ifdef __cplusplus
  48   extern "C" {
  49 #endif
  50
  51 /*----- Exponentation definitions -----------------------------------------*/
  52
  53 #define EXP_TYPE mp *
  54
  55 #define EXP_COPY(d, x) d = MP_COPY(x)
  56 #define EXP_DROP(x) MP_DROP(x)
  57
  58 #define EXP_MUL(a, x) do {                                              \
  59   mp *t = mpmont_mul(mm, spare, a, x);                                  \
  60   spare = a;                                                            \
  61   a = t;                                                                \
  62 } while (0)
  63
  64 #define EXP_SQR(a) do {                                                 \
  65   mp *t = mp_sqr(spare, a);                                             \
  66   spare = a;                                                            \
  67   a = mpmont_reduce(mm, t, t);                                          \
  68 } while (0)
  69
  70 #define EXP_FIX(x)
  71
  72 #define EXP_SETMUL(d, x, y) d = mpmont_mul(mm, MP_NEW, x, y)
  73
  74 #define EXP_SETSQR(d, x) do {                                           \
  75   d = mp_sqr(MP_NEW, x);                                                \
  76   d = mpmont_reduce(mm, d, d);                                          \
  77 } while (0)
  78
  79 #include "exp.h"
  80
  81 /*----- That's all, folks -------------------------------------------------*/
  82
  83 #ifdef __cplusplus
  84   }
  85 #endif
  86
  87 #endif