bruteforce.java - Erlo Tayamen

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package bruteforce;

import java.security.NoSuchAlgorithmException;
import java.io.UnsupportedEncodingException;
/**
 *
 * @author ejtay
 */
public class bruteforce {

    private String[] charset;
    private String hashedPassword;
    private SHA1 hash;
    private String password;
    private boolean done = false;

    public bruteforce(String hash) throws NoSuchAlgorithmException, UnsupportedEncodingException {
        this.charset = new String[]{"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t",                     "u", "v", "w", "x", "y", "z"};
        this.hash = new SHA1();
        this.hashedPassword = hash;
        generatePasswords("", 6);
        if(done){
            System.out.print("Password is:" + password + "\n");
        }
    }

    public void generatePasswords(String currentChar, int maxLen) throws NoSuchAlgorithmException, UnsupportedEncodingException{// generate passwords from charset a-z
        String hashed = hash.SHA1(currentChar);
       // System.out.print(hashed + "\n");
        if (hashed.equals(hashedPassword)){
            password = currentChar;
            this.done = true;
        }
        else{
            if (maxLen == 0){
                return;
            }
            for(int i = 0; i <= charset.length - 1; i++){
                String next = charset[i] + currentChar;
                if (!this.done){
                    generatePasswords(next, maxLen - 1);
                }
                else{
                    return;
                }
            }
        }

    }

}