/*
    * EL4J, the Extension Library for the J2EE, adds incremental enhancements to
    * the spring framework, http://el4j.sf.net
    * Copyright (C) 2008 by ELCA Informatique SA, Av. de la Harpe 22-24,
    * 1000 Lausanne, Switzerland, http://www.elca.ch
    *
    * EL4J is published under the GNU Lesser General Public License (LGPL)
    * Version 2.1. See http://www.gnu.org/licenses/
    *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
   * GNU Lesser General Public License for more details.
   *
   * For alternative licensing, please contact info@elca.ch
   */
  package ch.elca.el4j.tests.services.security;
  
  
  import javax.crypto.KeyGenerator;
  import javax.crypto.SecretKey;
  
  import org.apache.commons.codec.binary.Base64;
  import org.junit.Before;
  import org.junit.Test;
  
  import static org.junit.Assert.*;
  
  import ch.elca.el4j.services.security.encryption.AESCipher;
  
  
  /**
   * 
   * This class tests the encryption and decryption using AES.
   *
   * @svnLink $Revision: 3873 $;$Date: 2009-08-04 13:59:45 +0200 (Di, 04. Aug 2009) $;$Author: swismer $;$URL: https://el4j.svn.sourceforge.net/svnroot/el4j/branches/el4j_3_1/el4j/framework/modules/security/src/test/java/ch/elca/el4j/tests/services/security/AESEncryptionTest.java $
   *
   * @author Dominik Zindel (DZI)
   */
  public class AESEncryptionTest {
  
  	/**
  	 * The cipher used for en- and decryption.
  	 */
  	private AESCipher m_cipher;
  	
  	/**
  	 * The generated key.
  	 */
  	private String m_key;
  	
  	/**
  	 * The text that will be en- and decrypted.
  	 */
  	private String m_text = "myTopSecretPassword";
  	
  	/**
  	 * Generates a cipher with a key.
  	 */
  	@Before
  	public void setUp() throws Exception {
  		KeyGenerator kgen = KeyGenerator.getInstance("AES");
  		kgen.init(128);
  
  		// Generate the secret key specs.
  		SecretKey skey = kgen.generateKey();
  		byte[] raw = skey.getEncoded();
  
  		m_key = new String(Base64.encodeBase64(raw));
  		m_cipher = new AESCipher(m_key);
  	}
  	
  	/**
  	 * Encrypts and then decrypts a text and checks if the result of the decryption
  	 * equals the input of the encryption (= the original text).
  	 */
  	@Test
  	public void testEnDecryption() {
  		String encrypted = m_cipher.encrypt(m_text);
  		String decrypted = m_cipher.decrypt(encrypted);
  		assertEquals(m_text, decrypted);
  	}
  	
  	
  	/**
  	 * Tests the encryption of a text.
  	 */
  	@Test
  	public void testEncryption() {
  		String key = "wNGjAjybVC1FfQn628cU0w==";
  		String expectedEncrypted = "{AES-128}kmzDaaD2WTU4MblFz5396rxOHw9VthnIFiJmESbvn08=";
  		AESCipher cipher = new AESCipher(key);
  		
  		String encrypted = cipher.encrypt(m_text);
  		
  		assertEquals(expectedEncrypted, encrypted);
  	}
  	
  	/**
 	 * Tests the decryption of an encrypted text.
 	 */
 	@Test
 	public void testDecryption() {
 		String key = "wNGjAjybVC1FfQn628cU0w==";
 		String encrypted = "{AES-128}kmzDaaD2WTU4MblFz5396rxOHw9VthnIFiJmESbvn08=";
 		AESCipher cipher = new AESCipher(key);
 		
 		String decrypted = cipher.decrypt(encrypted);
 		assertEquals(m_text, decrypted);
 	}
 	
 }