Code
/*
* Parallel SHA-512 Password Cracker with OpenMP
* Compile: gcc -fopenmp -lcrypt -std=c99 -o crack crack.cc
* I used namp.lst as my dictionary file in the video.
* Written by: Pikahaxx
* Date: 13/05/2019
*/
#include <stdio.h>
#include <string.h>
#include <crypt.h>
#include <stdlib.h>
#include <omp.h>void chop(char *word){
int lenword=strlen(word);
if(word[lenword-1] == ‘\n’) word[lenword-1] = ‘\0’;
}int numlines(FILE *file){
if(file==NULL) return -1;
char ch;
int lines = 0;
while (ch != EOF){
ch = fgetc(file);
if(ch == ‘\n’) lines++;
}
return lines;
}void main(int argc, char *argv[]){
//Parameters error handling
if(argc!=4){
printf(“Parallel SHA-512 Password Cracker\nUSAGE: ./parshacrk <PATH TO DICTIONARY> ‘$6$<SALT>$’ ‘$6$<SALT>$<SHA-512 HASH>’\n”);
exit(-1);
}
int found=0; //0 = password not found ; 1 = password found
char word[BUFSIZ],salt[BUFSIZ], pwhash[BUFSIZ];
FILE *words = fopen(argv[1],”r”); //Open dictionary file
//File error handling
if(words==NULL){
printf(“Cannot open dictionary file.\n”);
exit(-1);
}
strcpy(salt,argv[2]);
strcpy(pwhash,argv[3]);
int size = numlines(words); // Number of words in dictionary
if(fseek(words,0,SEEK_SET)==-1) exit(-1); //seek error handling
//Parallel Region
#pragma omp parallel for private(word) shared(found) schedule(dynamic)
for(int i=0;i<size;i++){
if(fgets(word,BUFSIZ,words) != NULL){
chop(word);
if(found==1) exit(1);
printf(“[*] THREAD %i TRYING: %s\n”,omp_get_thread_num(),word);
char *hash = (char*)crypt(word,salt);
if(strcmp(hash,pwhash) == 0){
printf(“[+] PASSWORD FOUND: %s\n”,word);
found=1;
}
}
}
fclose(words);
if(found==0) printf(“[-] PASSWORD NOT FOUND, EXITING…\n”);
exit(0);
}
Video tutorial on how to perform the password cracking using OpenMp
