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Ajax4jsf is an open source extension to the JavaServer Faces standard that adds AJAX capability to JSF applications without requiring the writing of any JavaScript.

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/**
 * Licensed under the Common Development and Distribution License,
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.sun.com/cddl/
 *   
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 
 * implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */

package org.ajax4jsf.framework.util.base64;

import java.security.spec.KeySpec;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;

/**
 * @author shura (latest modification by $Author: alexsmirnov $)
 * @version $Revision: 1.5 $ $Date: 2006/09/29 10:14:05 $
 *
 */
public class Codec {

	private Cipher e = null;
	private Cipher d = null;
	

	/**
	 * 
	 */
	public Codec() {
		super();
		// TODO Auto-generated constructor stub
	}

	/**
	 * 
	 */
	public Codec( String p ) throws Exception {
		 byte[] s = {
		            (byte)0xA9, (byte)0x9B, (byte)0xC8, (byte)0x32,
		            (byte)0x56, (byte)0x34, (byte)0xE3, (byte)0x03
		        };
//         try {
			KeySpec keySpec = new DESKeySpec(p.getBytes("UTF8"));
			SecretKey key = SecretKeyFactory.getInstance("DES")
					.generateSecret(keySpec);
			e = Cipher.getInstance(key.getAlgorithm());
			d = Cipher.getInstance(key.getAlgorithm());

			// Prepare the parameters to the cipthers
//			AlgorithmParameterSpec paramSpec = new IvParameterSpec(s);

			e.init(Cipher.ENCRYPT_MODE, key);
			d.init(Cipher.DECRYPT_MODE, key);
//		} catch (Exception e) {
//			// TODO: handle exception
//		}
	}

	public String decode(String str) throws Exception {
			byte[] src = str.getBytes("UTF8");
			byte[] utf8 = decode(src);
			// Decode using utf-8
			return new String(utf8, "UTF8");
	}
	public String encode(String str) throws Exception {
//        try {
		    
			byte[] src = str.getBytes("UTF8");
//			int len = (src.length/8+1)*8;
//			byte[] block = new byte[len];
//			Arrays.fill(block,0,len,(byte)0x20);
//			System.arraycopy(src,0,block,0,src.length);

			// Decrypt
			byte[] utf8 = encode(src);

			// Decode using utf-8
			return new String(utf8, "UTF8");
//		} catch (Exception e) {
//			// TODO: handle exception
//			return null;
//		}
	}
	
	public byte[] decode(byte[] src) throws Exception {
		byte[] dec = URL64Codec.decodeBase64(src);
		// Decrypt
		if (null != d) {
			return d.doFinal(dec);
		} else {
			return dec;
		}
	}

	public byte[] encode(byte[] src) throws Exception {
		byte[] dec;
		if(null != e){
			dec = e.doFinal(src);
		} else {
			dec = src;
		}
		// Decrypt
		return URL64Codec.encodeBase64(dec);
	}

}