day4-advent-of-coding

package advent.of.code;

import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Day4 {
    public static String getMD5(String input) {
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            byte[] messageDigest = md.digest(input.getBytes());
            BigInteger number = new BigInteger(1, messageDigest);
            String hashtext = number.toString(16);
            while (hashtext.length() < 32) {
                hashtext = "0" + hashtext;
            }
            return hashtext;
        }
        catch (NoSuchAlgorithmException e) {
            throw new RuntimeException(e);
        }
    }

    public static void main(String[] args) throws NoSuchAlgorithmException {
        String text = "yzbqklnj";
        boolean found = false;

        int counter = 1;
        while(found != true) {
            String input = text + String.valueOf(counter);
            String md5 = getMD5(input);
            if(md5.substring(0, 5).equals("00000")) {       // part1
            //if(md5.substring(0, 6).equals("000000")) {        // part2
                found = true;
                System.out.println(input);
                System.out.println(md5);
            }
            counter++;
        }
    }
}