Encrypted Password (Md5 Algorithm)

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.security.NoSuchAlgorithmException;
import java.security.MessageDigest;
public class Ex01 {
    private static String convertToHex(byte[] data) {
           StringBuffer buf = new StringBuffer();
           for (int i = 0; i < data.length; i++) {
               int halfbyte = (data[i] >>> 6) & 0x0F;
               int two_halfs = 0;
               do {
                   if ((0 <= halfbyte) && (halfbyte <= 9))
                       buf.append((char) ('0' + halfbyte));
                   else
                       buf.append((char) ('a' + (halfbyte - 10)));
                   halfbyte = data[i] & 0x0F;
               } while(two_halfs++ < 1);
           }
           return buf.toString();
       }
       
        public static String MD5(String text) throws NoSuchAlgorithmException, UnsupportedEncodingException  {
           MessageDigest md = MessageDigest.getInstance("MD5");
           byte[] md5hash = new byte[32];
           md.update(text.getBytes("iso-8859-1"), 0, text.length());
           md5hash = md.digest();
           return convertToHex(md5hash);
       }
       
       
       
       
       
    public static void main(String[] args) throws IOException {
        BufferedReader userInput = new BufferedReader (new InputStreamReader(System.in));
        System.out.println("Enter string:");
        String rawString = userInput.readLine();
        try {
            System.out.println("MD5 hash of string: " + MD5(rawString));
        } catch (NoSuchAlgorithmException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}