git.distorted.org.uk Git - u/mdw/catacomb/blob - cast-base.h

   1 /* -*-c-*-
   2  *
   3  * $Id: cast-base.h,v 1.2 2004/04/02 01:03:49 mdw Exp $
   4  *
   5  * Basic macros and definitions for CAST-128 and CAST-256
   6  *
   7  * (c) 2000 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: cast-base.h,v $
  33  * Revision 1.2  2004/04/02 01:03:49  mdw
  34  * Miscellaneous constification.
  35  *
  36  * Revision 1.1  2000/06/17 10:48:29  mdw
  37  * CAST round function macros.
  38  *
  39  */
  40
  41 #ifndef CATACOMB_CAST_BASE_H
  42 #define CATACOMB_CAST_BASE_H
  43
  44 #ifdef __cplusplus
  45   extern "C" {
  46 #endif
  47
  48 /*----- Header files ------------------------------------------------------*/
  49
  50 #include <mLib/bits.h>
  51
  52 /*----- Round functions ---------------------------------------------------*/
  53
  54 #define CAST_R_guts(km, kr, xx, yy, aop, bop, cop) do {                 \
  55   uint32 i = km aop yy;                                                 \
  56   unsigned _r = kr;                                                     \
  57   i = ROL32(i, _r);                                                     \
  58   xx ^= ((cast_s[0][U8(i >> 24)] bop                                    \
  59           cast_s[1][U8(i >> 16)]) cop                                   \
  60           cast_s[2][U8(i >>  8)]) aop                                   \
  61           cast_s[3][U8(i >>  0)];                                       \
  62 } while (0)
  63
  64 #define CAST_R1(km, kr, xx, yy) CAST_R_guts(km, kr, xx, yy, +, ^, -)
  65 #define CAST_R2(km, kr, xx, yy) CAST_R_guts(km, kr, xx, yy, ^, -, +)
  66 #define CAST_R3(km, kr, xx, yy) CAST_R_guts(km, kr, xx, yy, -, +, ^)
  67
  68 /*----- Global variables --------------------------------------------------*/
  69
  70 extern const uint32 cast_s[4][256], cast_sk[4][256];
  71
  72 /*----- That's all, folks -------------------------------------------------*/
  73
  74 #ifdef __cplusplus
  75   }
  76 #endif
  77
  78 #endif