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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