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package com.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; /** * DES加密 解密算法 * @author zhangdi * */ public class DesUtil { private final static String DES = "DES"; private final static String ENCODE = "GBK"; private final static String defaultKey = "netwxactive"; /** * 使用 默认key 加密 * @param data 待加密数据 * @return * @throws Exception */ public static String encrypt(String data) throws Exception { byte[] bt = encrypt(data.getBytes(ENCODE), defaultKey.getBytes(ENCODE)); String strs = new BASE64Encoder().encode(bt); return strs; } /** * 使用 默认key 解密 * @param data 待解密数据 * @return * @throws IOException * @throws Exception */ public static String decrypt(String data) throws IOException, Exception { if (data == null) return null; BASE64Decoder decoder = new BASE64Decoder(); byte[] buf = decoder.decodeBuffer(data); byte[] bt = decrypt(buf, defaultKey.getBytes(ENCODE)); return new String(bt, ENCODE); } /** * Description 根据键值进行加密 * @param data 待加密数据 * @param key 密钥 * @return * @throws Exception */ public static String encrypt(String data, String key) throws Exception { byte[] bt = encrypt(data.getBytes(ENCODE), key.getBytes(ENCODE)); String strs = new BASE64Encoder().encode(bt); return strs; } /** * 根据键值进行解密 * @param data 待解密数据 * @param key 密钥 * @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(ENCODE)); return new String(bt, ENCODE); } /** * 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); } public static void main(String[] args){ String data = "我是需要被加密的数据kdjf123"; // 这里的key长度必须大于8位 String key ="12345678"; System.out.println("初始数据===>"+data); try { System.out.println(); System.out.println(">>>>>>>>>>根据预定秘钥加密后：" + encrypt(data, key)); System.out.println(">>>>>>>>>>根据预定秘钥解密后：" + decrypt(encrypt(data, key), key)); System.out.println("=========================================="); String encrypt = encrypt(data); System.out.println(">>>>>>>>>>默认秘钥加密后："+encrypt); System.out.println(">>>>>>>>>>默认秘钥解密后："+decrypt(encrypt)); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } }