SecureStore.java

/**
 *  OpenKM, Open Document Management System (http://www.openkm.com)
 *  Copyright (c) 2006-2011  Paco Avila & Josep Llort
 *
 *  No bytes were intentionally harmed during the development of this application.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *  
 *  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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

package com.openkm.util;

import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;

import org.apache.commons.codec.binary.Base64;

public class SecureStore {
	/**
	 * DES encoder
	 */
	public static byte[] desEncode(String key, byte[] src)
			throws InvalidKeyException, UnsupportedEncodingException,
			NoSuchAlgorithmException, InvalidKeySpecException,
			NoSuchPaddingException, IllegalBlockSizeException,
			BadPaddingException {
		DESKeySpec keySpec = new DESKeySpec(key.getBytes("UTF8"));
		SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
		SecretKey sKey = keyFactory.generateSecret(keySpec);

		Cipher cipher = Cipher.getInstance("DES"); // cipher is not thread safe
		cipher.init(Cipher.ENCRYPT_MODE, sKey);
		byte[] dst = cipher.doFinal(src);

		return dst;
	}

	/**
	 * DES decoder
	 */
	public static byte[] desDecode(String key, byte[] src)
			throws InvalidKeyException, UnsupportedEncodingException,
			NoSuchAlgorithmException, InvalidKeySpecException,
			NoSuchPaddingException, IllegalBlockSizeException,
			BadPaddingException {
		DESKeySpec keySpec = new DESKeySpec(key.getBytes("UTF8"));
		SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
		SecretKey sKey = keyFactory.generateSecret(keySpec);

		Cipher cipher = Cipher.getInstance("DES"); // cipher is not thread safe
		cipher.init(Cipher.DECRYPT_MODE, sKey);
		byte[] dst = cipher.doFinal(src);

		return dst;
	}
	
	/**
	 * Base64 encoder
	 */
	public static String b64Encode(byte[] src) {
		return new String(Base64.encodeBase64(src));
	}
	
	/**
	 * Base64 decoder
	 */
	public static byte[] b64Decode(String src) {
		return Base64.decodeBase64(src);
	}
	
	/**
	 * MD5 encoder
	 */
	public static String md5Encode(byte[] src) throws NoSuchAlgorithmException {
		StringBuilder sb = new StringBuilder();
		MessageDigest md = MessageDigest.getInstance("MD5");
		byte[] dst = md.digest(src);
		
		for (int i=0; i<dst.length; i++) {
			sb.append(Integer.toHexString((dst[i] >> 4) & 0xf));
			sb.append(Integer.toHexString(dst[i] & 0xf));
		}
		
		return sb.toString(); 
	}
}