Java - Como guardar contraseña cifrada

private void persist(PersistAction persistAction, String successMessage) {

	if (selected != null) {

		setEmbeddableKeys();

		try {

			if (persistAction != PersistAction.DELETE) {

				String clave= selected.getPassword();

				if(clave!=null){

					ejbFacade.cifrar(clave);

					getFacade().edit(selected);

				} else {

				ejbFacade.Seguridad(clave);

				getFacade().remove(selected);

				}

			}

			else{

				getFacade().remove(selected);

			}

			JsfUtil.addSuccessMessage(successMessage);

		} catch (EJBException ex) {

			String msg = "";

			Throwable cause = ex.getCause();

			if (cause != null) {

				msg = cause.getLocalizedMessage();

			}

			if (msg.length() > 0) {

				JsfUtil.addErrorMessage(msg);

			} else {

				JsfUtil.addErrorMessage(ex, ResourceBundle.getBundle("/Bundle").getString("PersistenceErrorOccured"));

			}

		} catch (Exception ex) {

			Logger.getLogger(this.getClass().getName()).log(Level.SEVERE, null, ex);

			JsfUtil.addErrorMessage(ex, ResourceBundle.getBundle("/Bundle").getString("PersistenceErrorOccured"));

		}

	}

}

if (persistAction != PersistAction.DELETE) {

	String clave= null;

	clave= selected.getPassword();

	getFacade().cifrado(clave);

	if(clave!=null){

		getFacade().edit(selected);

	} else {

		getFacade().remove(selected);

	}

}

else{

	getFacade().remove(selected);

}

public synchronized String cifrar(String plaintext) throws SystemUnavailableException {

	MessageDigest md = null;

	try {

		md = MessageDigest.getInstance("SHA-256"); //step 2 

	} catch (NoSuchAlgorithmException e) {

		throw new SystemUnavailableException(e.getMessage());

	}

	try{

		md.update(plaintext.getBytes("UTF-8")); //step 3 

	} catch (UnsupportedEncodingException e)

	{ throw new SystemUnavailableException(e.getMessage());

	}

	byte raw[] = md.digest(); //step 4         

	String hash;//step 5         

	hash = (new BASE64Encoder()).encode(raw);

	return hash; //step 6 

}