Java DES对称加密工具类（就这一篇就够了）

package org.collect.test.des;

import org.collect.test.rsa.Base64Tool;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import java.security.InvalidKeyException;
import java.security.SecureRandom;

/**
 * Des对称加密
 */
public class DesUtil {

    private static final String algorithm = "DES";
    private static final String key = "asde34675";


    public static void main(String[] args) throws Exception {
        String string = "勇敢行sfsdf3择发生的方式[email protected]#￥%……&*（）：“《》？@#$%^&()<>?:";
        String ssss =  DesUtil.encrypt(string);
        System.out.println(ssss);

        String xxxx = DesUtil.decrypt(ssss);
        System.out.println(xxxx);
    }



    /**
     * 加密
     */
    public static String encrypt(String string) throws Exception {
        Cipher cipher = getCipher(Cipher.ENCRYPT_MODE);
        byte[] bytes = cipher.doFinal(string.getBytes("utf-8"));
        return Base64Tool.byteToBase64(bytes);
    }


    /**
     * 解密
     */
    public static String decrypt(String ssss) throws Exception {
        Cipher cipher = getCipher(Cipher.DECRYPT_MODE);
        byte[] bytes = cipher.doFinal(Base64Tool.base64ToByte(ssss));
        String xxxx = new String(bytes, "utf-8");
        return xxxx;
    }



    private static Cipher getCipher(int type) throws Exception {
        // DES算法要求有一个可信任的随机数源
        SecureRandom random = new SecureRandom();
        // 创建一个DESKeySpec对象
        DESKeySpec desKey = new DESKeySpec(key.getBytes());
        // 创建一个密匙工厂
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(algorithm);
        // 将DESKeySpec对象转换成SecretKey对象
        SecretKey securekey = keyFactory.generateSecret(desKey);
        // Cipher对象实际完成解密操作
        Cipher cipher = Cipher.getInstance(algorithm);
        // 用密匙初始化Cipher对象
        cipher.init(type, securekey, random);
        return cipher;
    }


}