package org.osforce.spring4me.commons.cipher;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.security.Key;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
/**
*
* @author <a href="mailto:haozhonghu@hotmail.com">gavin</a>
* @since 0.1.0
* @create May 30, 2011 - 4:11:57 PM <a
* href="http://www.opensourceforce.org">开源力量</a>
*/
@SuppressWarnings("restriction")
public class CipherUtil {
private static final String ALGORITHM = "DES";
public static String encrypt(String data, String file) throws Exception {
return new BASE64Encoder().encode(encrypt(data.getBytes(), file));
}
public static byte[] encrypt(byte[] data, String file) throws Exception {
Key key = getKey(file);
Cipher cipher = Cipher.getInstance(ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, key);
return cipher.doFinal(data);
}
public static String decrypt(String data, String file) throws Exception {
return new String(decrypt(new BASE64Decoder().decodeBuffer(data), file));
}
public static byte[] decrypt(byte[] data, String file) throws Exception {
Key key = getKey(file);
Cipher cipher = Cipher.getInstance(ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, key);
return cipher.doFinal(data);
}
public static Key getKey(String file) throws Exception {
Key key = null;
File keyFile = new File(file);
if (keyFile.exists()) {
ObjectInputStream ois = new ObjectInputStream(new FileInputStream(keyFile));
key = (Key) ois.readObject();
ois.close();
} else {
KeyGenerator keyGen = KeyGenerator.getInstance(ALGORITHM);
keyGen.init(56);
key = keyGen.generateKey();
keyFile.createNewFile();
ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(keyFile));
oos.writeObject(key);
oos.close();
}
return key;
}
}