public class PasswordHelper {

    private RandomNumberGenerator randomNumberGenerator =

     new SecureRandomNumberGenerator();

    private String algorithmName = "md5";

    private final int hashIterations = 2;

    public void encryptPassword(User user) {

        user.setSalt(randomNumberGenerator.nextBytes().toHex());

        String newPassword = new SimpleHash(

                algorithmName,

                user.getPassword(),

                ByteSource.Util.bytes(user.getCredentialsSalt()),

                hashIterations).toHex();

        user.setPassword(newPassword);

    }

}