PROGRAM FOR HOW TO ENCRYPT THE PASSWORD

PROGRAM FOR HOW TO ENCRYPT THE PASSWORD


#include <stdio.h>

#include <string.h>

#include <process.h>

#include <stdlib.h>

#include <ctype.h>

#include <conio.h>



unsigned char huge Data[100001];

unsigned char keystream[1001];

int Rpoint[300];



void main (int argc,char *argv[]) {

FILE *fd;

int i,j,k;

int size;

char ch;

char *name;

int cracked;

int sizemask;

int maxr;

int rsz;

int pos;

int Rall[300]; /* recource allocation table */





if (argc<2) {

printf("usage: glide filename (username)");

exit(1);

}



/* read PWL file */



fd=fopen(argv[1],"rb");

if(fd==NULL) {

printf("can't open file %s",argv[1]);

exit(1);

}

size=0;

while(!feof(fd)) {

Data[size++]=fgetc(fd);

}

size--;

fclose(fd);



/* find username */

name=argv[1];

if(argc>2) name=argv[2];

printf("Username: %s\n",name);



/* copy encrypted text into keystream */

cracked=size-0x0208;

if(cracked<0) cracked=0;

if(cracked>1000) cracked=1000;

memcpy(keystream,Data+0x208,cracked );



/* generate 20 bytes of keystream */

for(i=0;i<20;i++) {

ch=toupper(name[i]);

if(ch==0) break;

if(ch=='.') break;

keystream[i]^=ch;

};

cracked=20;





/* find allocated recources */



sizemask=keystream[0]+(keystream[1]<<8);

printf("Sizemask: %04X\n",sizemask);



for(i=0;i<256;i++) Rall[i]=0;



maxr=0;

for(i=0x108;i<0x208;i++) {

if(Data[i]!=0xff) {

Rall[Data[i]]++;

if (Data[i]>maxr) maxr=Data[i];

}

}

maxr=(((maxr/16)+1)*16); /* recource pointer table size appears to be divisable by

16 */



/* search after recources */



Rpoint[0]=0x0208+2*maxr+20+2; /* first recource */

for(i=0;i<maxr;i++) {

/* find size of current recource */

pos=Rpoint[i];

rsz=Data[pos]+(Data[pos+1]<<8);

rsz^=sizemask;

printf("Analyzing block with size: %04x\t(%d:%d)\n",rsz,i,Rall[i]);

if( (Rall[i]==0) && (rsz!=0) ) {

printf("unused resource has nonzero size !!!\n");

printf("If last line produced any : You may try to recover\n");

printf("press y to attempt recovery\n");

ch=getch();

if(ch!='y') exit(0);

rsz=2;

i-=1;

}



pos+=rsz;



/* Resources have a tendency to have the wrong size for some reason */

/* check for correct size */



if(i<maxr-1) {

while(Data[pos+3]!=keystream[1]) {

printf(":",Data[pos+3]);

pos+=2; /* very rude may fail */

}

}



pos+=2; /* include pointer in size */

Rpoint[i+1]=pos;

}

Rpoint[maxr]=size;



/* insert Table data into keystream */

for(i=0;i <= maxr;i++) {

keystream[20+2*i]^=Rpoint[i] & 0x00ff;

keystream[21+2*i]^=(Rpoint[i] >> 8) & 0x00ff;

}

cracked+=maxr*2+2;



printf("%d bytes of keystream recovered\n",cracked);



/* decrypt resources */

for(i=0;i < maxr;i++) {

rsz=Rpoint[i+1]-Rpoint[i];

if (rsz>cracked) rsz=cracked;

printf("Recource[%d] (%d)\n",i,rsz);

for(j=0;j<rsz;j++) printf("%c",Data[Rpoint[i]+j]^keystream[j]);

printf("\n");

}





exit(0);

}