/*******************************************************************************
 * Copyright 2014 Federal Chancellery Austria
 * MOA-ID has been developed in a cooperation between BRZ, the Federal
 * Chancellery Austria - ICT staff unit, and Graz University of Technology.
 *
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 *******************************************************************************/
package at.gv.egovernment.moa.id.configuration.helper;

import java.security.spec.KeySpec;

import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.SecretKeySpec;

import at.gv.egovernment.moa.util.Base64Utils;
import lombok.extern.slf4j.Slf4j;

@Slf4j
public class AuthenticationHelper {

  public static String generateKeyFormPassword(String password) {
    SecretKeyFactory factory;

    try {
      factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
      final KeySpec spec = new PBEKeySpec(password.toCharArray(), "TestSALT".getBytes(), 1024, 128);
      final SecretKey tmp = factory.generateSecret(spec);
      final SecretKeySpec secret = new SecretKeySpec(tmp.getEncoded(), "AES");
      return Base64Utils.encode(secret.getEncoded());

    } catch (final Exception e) {
      log.info("Key generation form password failed.");
      return null;
    }

  }

}