复制代码 代码如下:
import java.security.Key;
import java.security.SecureRandom;
import java.security.spec.AlgorithmParameterSpec;

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

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class Des
{
public static final String ALGORITHM_DES = "DES/CBC/PKCS5Padding";
private static Log log = LogFactory.getLog(Des.class);

/**
* DES算法，加密
*
* @param data 待加密字符串
* @param key 加密私钥，长度不能够小于8位
* @return 加密后的字节数组，一般结合Base64编码使用
* @throws CryptException 异常
*/
public static String encode(String key,String data) throws Exception
{
return encode(key, data.getBytes());
}
/**
* DES算法，加密
*
* @param data 待加密字符串
* @param key 加密私钥，长度不能够小于8位
* @return 加密后的字节数组，一般结合Base64编码使用
* @throws CryptException 异常
*/
public static String encode(String key,byte[] data) throws Exception
{
try
{
DESKeySpec dks = new DESKeySpec(key.getBytes());

SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
//key的长度不能够小于8位字节
Key secretKey = keyFactory.generateSecret(dks);
Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
IvParameterSpec iv = new IvParameterSpec("********".getBytes());
AlgorithmParameterSpec paramSpec = iv;
cipher.init(Cipher.ENCRYPT_MODE, secretKey,paramSpec);

byte[] bytes = cipher.doFinal(data);
return Base64.encode(bytes);
} catch (Exception e)
{
throw new Exception(e);
}
}

/**
* DES算法，解密
*
* @param data 待解密字符串
* @param key 解密私钥，长度不能够小于8位
* @return 解密后的字节数组
* @throws Exception 异常
*/
public static byte[] decode(String key,byte[] data) throws Exception
{
try
{
SecureRandom sr = new SecureRandom();
DESKeySpec dks = new DESKeySpec(key.getBytes());
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
//key的长度不能够小于8位字节
Key secretKey = keyFactory.generateSecret(dks);
Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
IvParameterSpec iv = new IvParameterSpec("********".getBytes());
AlgorithmParameterSpec paramSpec = iv;
cipher.init(Cipher.DECRYPT_MODE, secretKey,paramSpec);
return cipher.doFinal(data);
} catch (Exception e)
{
// e.printStackTrace();
throw new Exception(e);
}
}

/**
* 获取编码后的值
* @param key
* @param data
* @return
* @throws Exception
* @throws Exception
*/
public static String decodeValue(String key,String data) throws Exception
{
byte[] datas;
String value = null;

datas = decode(key, Base64.decode(data));

value = new String(datas);
if (value.equals("")){
throw new Exception();
}
return value;
}
}