DES 双向加密

public class DESUtil {

/**
* 日志输出对象
*/
public static final Log log = LogFactory.getLog(DESUtil.class);

/**
* 加密逻辑方法
* @param message
* @param key
* @return
* @throws Exception
*/
private static byte[] encryptProcess(String message, String key) throws Exception {
Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));
cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);
return cipher.doFinal(message.getBytes("UTF-8"));
}

/**
* 解密逻辑方法
* @param message
* @param key
* @return
* @throws Exception
*/
private static String decryptProcess(String message,String key) throws Exception {
byte[] bytesrc =convertHexString(message);
Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));
cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);
byte[] retByte = cipher.doFinal(bytesrc);
return new String(retByte);
}

/**
* 16进制数组数转化
* @param ss
* @return
*/
private static byte[] convertHexString(String ss) throws Exception {
byte digest[] = new byte[ss.length() / 2];
for(int i = 0; i < digest.length; i++)
{
String byteString = ss.substring(2 * i, 2 * i + 2);
int byteValue = Integer.parseInt(byteString, 16);
digest[i] = (byte)byteValue;
}
return digest;
}

/**
* 十六进制数转化
* @param b
* @return
* @throws Exception
*/
private static String toHexString(byte b[]) throws Exception {
StringBuffer hexString = new StringBuffer();
for (int i = 0; i < b.length; i++) {
String plainText = Integer.toHexString(0xff & b[i]);
if (plainText.length() < 2)
plainText = "0" + plainText;
hexString.append(plainText);
}

return hexString.toString();
}

/**
* 加密方法
*/
public static String encrypt(String message,String key){
log.info("加密原串为：" + message);
String enStr = null;
try {
String orignStr=java.net.URLEncoder.encode(message, "utf-8");
enStr=toHexString(encryptProcess(orignStr, key));
} catch (Exception e) {
log.error("参数加密异常！", e);
}
return enStr;
}

/**
* 解密方法
*/
public static String decrypt(String message,String key){
String decStr = null;
try {
//            log.debug("解密串：" + message);
//            log.debug("解密KEY:" + key);
decStr = java.net.URLDecoder.decode(decryptProcess(message,key), "utf-8") ;
//            log.info("参数解密结果：" + decStr);
}catch (Exception e) {
log.error("参数解密异常！", e);
}
return decStr;
}

}