DES加密解密

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package com.zrh2;


import java.security.SecureRandom;


import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import java.io.IOException;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;


import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;


public class DesUtil{


private final static String DES = "DES";


public static void main(String[] args) throws Exception {
String data = "hello word";
String key = "zhourihong";
String str = encrypt(data, key);
System.err.println("加密后的数据:"+str);
System.err.println("解密后的数据:"+decrypt(str,key));


}

/**
* Description 根据键值进行加密
* @param data 
* @param key  加密键byte数组
* @return
* @throws Exception
*/
public static String encrypt(String data, String key) throws Exception {
byte[] bt = encrypt(data.getBytes(), key.getBytes());
String strs = new BASE64Encoder().encode(bt);
return strs;
}


/**
* Description 根据键值进行解密
* @param data
* @param key  加密键byte数组
* @return
* @throws IOException
* @throws Exception
*/
public static String decrypt(String data, String key) throws IOException,
Exception {
if (data == null)
return null;
BASE64Decoder decoder = new BASE64Decoder();
byte[] buf = decoder.decodeBuffer(data);
byte[] bt = decrypt(buf,key.getBytes());
return new String(bt);
}


/**
* Description 根据键值进行加密
* @param data
* @param key  加密键byte数组
* @return
* @throws Exception
*/
private static byte[] encrypt(byte[] data, byte[] key) throws Exception {
// 生成一个可信任的随机数源
SecureRandom sr = new SecureRandom();


// 从原始密钥数据创建DESKeySpec对象
DESKeySpec dks = new DESKeySpec(key);


// 创建一个密钥工厂,然后用它把DESKeySpec转换成SecretKey对象
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
SecretKey securekey = keyFactory.generateSecret(dks);


// Cipher对象实际完成加密操作
Cipher cipher = Cipher.getInstance(DES);


// 用密钥初始化Cipher对象
cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);


return cipher.doFinal(data);
}


/**
* Description 根据键值进行解密
* @param data
* @param key  加密键byte数组
* @return
* @throws Exception
*/
private static byte[] decrypt(byte[] data,byte[] key)throws Exception {
// 生成一个可信任的随机数源
SecureRandom sr = new SecureRandom();


// 从原始密钥数据创建DESKeySpec对象
DESKeySpec dks = new DESKeySpec(key);


// 创建一个密钥工厂,然后用它把DESKeySpec转换成SecretKey对象
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
SecretKey securekey = keyFactory.generateSecret(dks);


// Cipher对象实际完成解密操作
Cipher cipher = Cipher.getInstance(DES);


// 用密钥初始化Cipher对象
cipher.init(Cipher.DECRYPT_MODE, securekey, sr);


return cipher.doFinal(data);
}


}
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