java 加密解密

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package com;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 = "我是贺帅哥";String key = "12@@asdfd";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);}}
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