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TUCoPS :: Crypto :: schneier.c

The Blowfish Algorithm




From msuinfo!uwm.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!europa.eng.gtefsd.com!MathWorks.Com!news.kei.com!ddsw1!chinet!schneier Tue Mar 22 09:37:09 1994
Newsgroups: sci.crypt
Path: msuinfo!uwm.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!europa.eng.gtefsd.com!MathWorks.Com!news.kei.com!ddsw1!chinet!schneier
From: schneier@chinet.chinet.com (Bruce Schneier)
Subject: BLOWFISH - Corrected code and Data File - from Apr 94 DDJ
Message-ID: <Cn0sEK.42x@chinet.chinet.com>
Organization: Chinet - Public Access UNIX
Distribution: usa
Date: Mon, 21 Mar 1994 15:01:31 GMT
Lines: 380

This is the corrected BLOWFISH code.  BLOWFISH is a secret key algorithm
that appeared in the Apr 94 Dr. Dobbs Journal.

This posting includes:
	blowfish.h
	blowfish.c
	blowfish.dat.uu

In deference to U.S. export laws, this code is being posted for "usa"
distribution only.

Bruce

**************************************************************************
* Bruce Schneier
* Counterpane Systems         For a good prime, call 391581 * 2^216193 - 1
* schneier@chinet.com
**************************************************************************

********************BLOWFISH.H********************

#define MAXKEYBYTES 56		/* 448 bits */
// #define little_endian 1		/* Eg: Intel */
#define big_endian 1		/* Eg: Motorola */

short opensubkeyfile(void);
unsigned long F(unsigned long x);
void Blowfish_encipher(unsigned long *xl, unsigned long *xr);
void Blowfish_decipher(unsigned long *xl, unsigned long *xr);
short InitializeBlowfish(char key[], short keybytes);

********************BLOWFISH.C********************

#ifdef little_endian   /* Eg: Intel */
   #include <dos.h>
   #include <graphics.h>
   #include <io.h>
#endif

#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>

#ifdef little_endian   /* Eg: Intel */
   #include <alloc.h>
#endif

#include <ctype.h>

#ifdef little_endian   /* Eg: Intel */
   #include <dir.h>
   #include <bios.h>
#endif

#ifdef big_endian
   #include <Types.h>
#endif

#include "Blowfish.h"

#define N               16
#define noErr            0
#define DATAERROR         -1
#define KEYBYTES         8
#define subkeyfilename   "Blowfish.dat"

unsigned long P[N + 2];
unsigned long S[4][256];
FILE*         SubkeyFile;

short opensubkeyfile(void) /* read only */
{
   short error;

   error = noErr;

   if((SubkeyFile = fopen(subkeyfilename,"rb")) == NULL) {
      error = DATAERROR;
   }
 
   return error;
}

unsigned long F(unsigned long x)
{
   unsigned short a;
   unsigned short b;
   unsigned short c;
   unsigned short d;
   unsigned long  y;

   d = x & 0x00FF;
   x >>= 8;
   c = x & 0x00FF;
   x >>= 8;
   b = x & 0x00FF;
   x >>= 8;
   a = x & 0x00FF;
   //y = ((S[0][a] + S[1][b]) ^ S[2][c]) + S[3][d];
   y = S[0][a] + S[1][b];
   y = y ^ S[2][c];
   y = y + S[3][d];

   return y;
}

void Blowfish_encipher(unsigned long *xl, unsigned long *xr)
{
   unsigned long  Xl;
   unsigned long  Xr;
   unsigned long  temp;
   short          i;

   Xl = *xl;
   Xr = *xr;

   for (i = 0; i < N; ++i) {
      Xl = Xl ^ P[i];
      Xr = F(Xl) ^ Xr;

      temp = Xl;
      Xl = Xr;
      Xr = temp;
   }

   temp = Xl;
   Xl = Xr;
   Xr = temp;

   Xr = Xr ^ P[N];
   Xl = Xl ^ P[N + 1];
  
   *xl = Xl;
   *xr = Xr;
}

void Blowfish_decipher(unsigned long *xl, unsigned long *xr)
{
   unsigned long  Xl;
   unsigned long  Xr;
   unsigned long  temp;
   short          i;

   Xl = *xl;
   Xr = *xr;

   for (i = N + 1; i > 1; --i) {
      Xl = Xl ^ P[i];
      Xr = F(Xl) ^ Xr;

      /* Exchange Xl and Xr */
      temp = Xl;
      Xl = Xr;
      Xr = temp;
   }

   /* Exchange Xl and Xr */
   temp = Xl;
   Xl = Xr;
   Xr = temp;

   Xr = Xr ^ P[1];
   Xl = Xl ^ P[0];

   *xl = Xl;
   *xr = Xr;
}

short InitializeBlowfish(char key[], short keybytes)
{
   short          i;
   short          j;
   short          k;
   short          error;
   short          numread;
   unsigned long  data;
   unsigned long  datal;
   unsigned long  datar;

   /* First, open the file containing the array initialization data */
   error = opensubkeyfile();
   if (error == noErr) {
      for (i = 0; i < N + 2; ++i) {
         numread = fread(&data, 4, 1, SubkeyFile);
   #ifdef little_endian      /* Eg: Intel   We want to process things in byte   */
                           /*   order, not as rearranged in a longword          */
         data = ((data & 0xFF000000) >> 24) |
                ((data & 0x00FF0000) >>  8) |
                ((data & 0x0000FF00) <<  8) |
                ((data & 0x000000FF) << 24);
   #endif

         if (numread != 1) {
            return DATAERROR;
         } else {
            P[i] = data;
         }
      }

      for (i = 0; i < 4; ++i) {
         for (j = 0; j < 256; ++j) {
             numread = fread(&data, 4, 1, SubkeyFile);

   #ifdef little_endian      /* Eg: Intel   We want to process things in byte   */
                           /*   order, not as rearranged in a longword          */
            data = ((data & 0xFF000000) >> 24) |
                   ((data & 0x00FF0000) >>  8) |
                   ((data & 0x0000FF00) <<  8) |
                   ((data & 0x000000FF) << 24);
   #endif

             if (numread != 1) {
               return DATAERROR;
            } else {
               S[i][j] = data;
            }
         }
      }

      fclose(SubkeyFile);

      j = 0;
      for (i = 0; i < N + 2; ++i) {
         data = 0x00000000;
         for (k = 0; k < 4; ++k) {
            data = (data << 8) | key[j];
            j = j + 1;
            if (j >= keybytes) {
               j = 0;
            }
         }
         P[i] = P[i] ^ data;
      }

        datal = 0x00000000;
      datar = 0x00000000;

      for (i = 0; i < N + 2; i += 2) {
         Blowfish_encipher(&datal, &datar);

         P[i] = datal;
         P[i + 1] = datar;
      }

      for (i = 0; i < 4; ++i) {
         for (j = 0; j < 256; j += 2) {

            Blowfish_encipher(&datal, &datar);
   
            S[i][j] = datal;
            S[i][j + 1] = datar;
         }
      }
   } else {
      printf("Unable to open subkey initialization file : %d\n", error);
   }

   return error;
}

********************BLOWFISH.DAT.UU********************


begin 0700 "Blowfish.dat"
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`
end




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