- package com.afreon.util;
- import java.io.IOException;
- import java.security.SecureRandom;
- import javax.crypto.Cipher;
- import javax.crypto.SecretKey;
- 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 = "123 456";
- String key = "wang!@#$%";
- System.err.println(encrypt(data, key));
- System.err.println(decrypt(encrypt(data, key), 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);
- }
- }
- //该片段来自于http://www.codesnippet.cn/detail/140520149570.html
来源: http://www.codesnippet.cn/detail/140520149570.html