/* 
 Atanas Dimitrov
 USER4
 Homework Assignment #3
 CS6900
 Dr. Li
 */

#include <strings.h>
#include <stdio.h>
#include <unistd.h>
#include "./crypt.h"

char password[8];
char letters[]= { 'u', 's', 'e', 'r', '4' };

void decrypt(int var, int length)
{
	int i;
	char *enc_passwd;
        
	if(var==length)
	{
		//if this is a complete permutation then compare its encrypted version
		//with shadow file entry. and display as "password -> encrypted password" pair
		if (strcmp(enc_passwd=crypt(password, "KC"), "KChZuswj7Gd8Y") == 0)
		{
                	printf("%s -> ",password);
			printf ("%s\n", enc_passwd);
			exit(0);
		}
        }
	else
	{
		//creates the next permutation by adding letters recursively
                for (i=0; i<sizeof(letters); i++)
		{
                        password[var] = letters[i];
                        decrypt(var+1, length);
                }
        }
}

int main()
{
	int i;
	//variable password length from 1 to 8 bytes (letters)
	for (i=1; i<9; i++)
	        decrypt(0, i);

	exit(0);
}

/*
susurrrr -> KChZuswj7Gd8Y : PASS FOR USER  IS "susurrrr"
*/