Category : Word Perfect
Archive : WPGUESS.ZIP
Filename : WPGUESS.C
Output of file : WPGUESS.C contained in archive : WPGUESS.ZIP
** Copyright 1992 by Raymond Gardner -- All rights reserved.
** written by Raymond Gardner -- Englewood, Colorado -- 7/92
*/
#include
#include
#include
#define coincidence_cutoff 5
#define maxkeylen 32
#define bufsz (24*1024)
void confusion_mask(int keylen, char *buf, int cnt)
{
while ( cnt-- )
*buf++ ^= ++keylen;
}
void guess_password(char *buf, int bufcnt, int keylen)
{
static long freq[maxkeylen+1][256];
int c, i, j;
long n;
for ( j = i = 0; i + keylen < bufcnt; ++i )
j += (buf[i] == buf[i+keylen]);
if ( (n = j * 256L / bufcnt) >= coincidence_cutoff ) {
printf("coincidence index: %2ld probable key: ", n);
memset(freq, 0, sizeof(freq));
for ( i = 0; i < bufcnt; ++i )
++freq[i % keylen][255 & buf[i]];
for ( i = 0; i < keylen; ++i ) {
for ( n = j = 0; j < 256; ++j ) {
if ( freq[i][j] > n ) {
n = freq[i][j];
c = j ^ ' ';
}
}
putchar(isprint(c) ? c : '~');
}
putchar('\n');
}
}
int main(int argc, char **argv)
{
FILE *infile;
static char buf[bufsz];
int keylen, bufcnt;
printf("%s\n%s\n%s\n\n",
"WordPerfect 5.1 password guesser -- version 1.0",
"Copyright 1992 by Raymond Gardner -- All rights reserved.",
"Use and distribute freely WITH SOURCE CODE; no fee may be charged.");
if ( argc < 2 ) {
printf("Usage: wpguess filename\n");
} else {
printf("Highest coincidence index is most probable key.\n\n");
infile = fopen(argv[1], "rb");
if ( infile == NULL ) {
printf("can't open file %s.\n", argv[1]);
} else {
/***/ fread(buf, 1, 16, infile);
bufcnt = fread(buf, 1, bufsz, infile);
if ( bufcnt <= 48 ) {
printf("input file bad or too short.\n");
} else {
for ( keylen = 1; keylen <= maxkeylen; ++keylen ) {
/***/ confusion_mask(keylen, buf, bufcnt);
guess_password(buf, bufcnt, keylen);
/***/ confusion_mask(keylen, buf, bufcnt);
}
}
}
}
return 0;
}
Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!
This is so awesome! 😀 I’d be cool if you could download an entire archive of this at once, though.
But one thing that puzzles me is the “mtswslnkmcjklsdlsbdmMICROSOFT” string. There is an article about it here. It is definitely worth a read: http://www.os2museum.com/wp/mtswslnk/