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cipher_chaos.c

/*
 * Copyright (C) 2001, 2002, and 2003  Roy Keene
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 *      email: dact@rkeene.org
 */

#include "dact.h"
#include <math.h>
#include <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#include <fcntl.h>
#include "ui.h"
#include "cipher_chaos.h"


#if defined(USE_MODULES) && defined(AS_MODULE)
#include "module.h"
uint32_t DC_NUM=0;
uint32_t DC_TYPE=DACT_MOD_TYPE_ENC;
void *DC_ALGO=cipher_chaos;
char *DC_NAME="chaos (MOD)";
#endif


int cipher_chaos(const char *inblock, char *outblock, const int blksize, char *key, const int mode) {
      switch (mode) {
            case (DACT_MODE_CINIT+DACT_MODE_CDEC):
            case (DACT_MODE_CINIT+DACT_MODE_CENC):
            case DACT_MODE_CINIT:
                  return(cipher_chaos_init(mode,key));
                  break;
            case DACT_MODE_CDEC:
                  return(cipher_chaos_encdec(inblock, outblock, blksize, key));
                  break;
            case DACT_MODE_CENC:
#ifdef DACT_CIPHER_CHAOS
                  return(cipher_chaos_encdec(inblock, outblock, blksize, key));
#else
                  dact_ui_status(DACT_UI_LVL_GEN, "The chaos cipher is no longer supported.");
                  return(-1);
#endif
                  break;
      }
      return(0);
}

int cipher_chaos_init(const int mode, char *key) {
      return(cipher_chaos_init_getkey(mode-DACT_MODE_CINIT,key));
}

int cipher_chaos_init_getkey(const int mode, char *key) {
      strcpy(key,dact_ui_getuserinput("File Identification Number: ", 128, 1));
      return(1);
}

int cipher_chaos_encdec(const char *blk, char *outblk, const int blksize, char *key) {
      double fkey;
      int y=0,i;

      fkey=(double) atoi(key);
      for (i=0;i<blksize;i++) {
            outblk[i]=blk[i]^cipher_chaos_getbyte(&fkey,y);
      }
      return(blksize);
}

unsigned char cipher_chaos_getbyte(double *x, int y) {
      static int i=0;

      NORM(*x);
      FIX(*x);
      BEST(*x,y);
      *x=(double) (R(*x)*(1-*x));
      i++;
SPOTVAR_NUM(y);
      return((unsigned char) y);
}

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