MD5加密解密

package com.t3.ts.driver.resume.utils;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;
import java.security.Key;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.spec.AlgorithmParameterSpec;

/**
 * @class_name: MD5Tool
 * @description:
 * @author: wm_yu
 * @create: 2019/09/12
 **/
public class MD5Tool {

    private final static Logger log = LoggerFactory.getLogger(MD5Tool.class);
    /**
     * 向量(同时拥有向量和密匙才能解密)，此向量必须是8byte，多少都报错
     */
    private final static byte[] DESIV = new byte[] { 0x22, 0x54, 0x36, 110, 0x40, (byte) 0xac, (byte) 0xad, (byte) 0xdf };
    /**
     * 加密算法的参数接口
     */
    private static AlgorithmParameterSpec iv = null;
    private static Key key = null;
    private static String charset = "utf-8";
    private static String SECRET_KEY = "d5416a341766390368ab75d220a6c051";

    static {
        try {
            // 设置密钥参数
            DESKeySpec keySpec = new DESKeySpec(SECRET_KEY.getBytes(charset));
            // 设置向量
            iv = new IvParameterSpec(DESIV);
            // 得到密钥工厂
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
            // 获得密钥对象
            key = keyFactory.generateSecret(keySpec);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        try {
            String source = "123456789";
            String value = md5Encode(source);
            String decode = md5Decode(value);

            System.out.println("原始数据:" + source + "----加密后的数据:" + value + "-----解密后的数据:" + decode);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 加密
     * @param data
     * @return
     * @throws Exception
     */
    public static String md5Encode(String data) throws Exception {
        // 获得加密对象Cipher
        Cipher enCipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
        // 设置工做模式为加密模式，给出密钥和向量
        enCipher.init(Cipher.ENCRYPT_MODE, key, iv);
        byte[] pasByte = enCipher.doFinal(data.getBytes(charset));
        BASE64Encoder base64Encoder = new BASE64Encoder();
        return base64Encoder.encode(pasByte);
    }

    /**
     * 解密
     * @param data
     * @return
     * @throws Exception
     */
    public static String md5Decode(String data) throws Exception {
        Cipher deCipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
        deCipher.init(Cipher.DECRYPT_MODE, key, iv);
        BASE64Decoder base64Decoder = new BASE64Decoder();
        //此处注意doFinal()的参数的位数必须是8的倍数，不然会报错（经过encode加密的字符串读出来都是8的倍数位，但写入文件再读出来，就可能由于读取的方式的问题，致使最后此处的doFinal()的参数的位数不是8的倍数）
        //此处必须用base64Decoder，若用data。getBytes()则获取的字符串的byte数组的个数很可能不是8的倍数，并且不与上面的BASE64Encoder对应（即便解密不报错也不会获得正确结果）
        byte[] pasByte = deCipher.doFinal(base64Decoder.decodeBuffer(data));
        return new String(pasByte, charset);
    }

    /**
     * 获取MD5的值，可用于对比校验
     * @param sourceStr
     * @return
     */
    private static String getMD5Value(String sourceStr) {
        String result = "";
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(sourceStr.getBytes());
            byte b[] = md.digest();
            int i;
            StringBuffer buf = new StringBuffer("");
            for (int offset = 0; offset < b.length; offset++) {
                i = b[offset];
                if (i < 0){ i += 256;}
                if (i < 16){buf.append("0");}
                buf.append(Integer.toHexString(i));
            }
            result = buf.toString();
        } catch (NoSuchAlgorithmException e) {
        }
        return result;
    }

    }