Responsável por gerar um hash MD5

MD5Hashing.java

package br.com.risingforce.geradores;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * <b>Classe responsável por gerar um hash MD5.</b>
 *
 * @author Dilnei Cunha.
 */
public class MD5Hashing {

    /**
     * <b>Gera Hash MD5 e retorna o valor como uma string.</b>
     *
     * @param str
     * @return String
     * @throws NoSuchAlgorithmException
     */
    public static String generateHashMD5(String str) throws NoSuchAlgorithmException {

        MessageDigest md = MessageDigest.getInstance("MD5");
        md.update(str.getBytes());

        byte byteData[] = md.digest();

        //convert the byte to hex format method 1
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < byteData.length; i++) {
            sb.append(Integer.toString((byteData[i] & 0xff) + 0x100, 16).substring(1));
        }

        //convert the byte to hex format method 2
        StringBuilder hexString = new StringBuilder();
        for (int i = 0; i < byteData.length; i++) {
            String hex = Integer.toHexString(0xff & byteData[i]);
            if (hex.length() == 1) {
                hexString.append('0');
            }
            hexString.append(hex);
        }
        return hexString.toString();
    }
    
    public static void main(String args[]) throws NoSuchAlgorithmException {
    
        System.out.println(generateHashMD5("123456"));

    }
}