Analysis of Des implementation process of java simple data encryption method

This article mainly introduces the analysis of the implementation process of DES, a simple java data encryption method. It is introduced in great detail through the example code, which has a certain reference value for everyone's study or work. Friends in need can refer to it

1. When data is transmitted in the network, it needs to be encrypted

Both parties agree on the same key (the key is not transmitted in the network, but only encrypted data), and then convert the key according to certain des rules to obtain the real key. In order to increase security, the encoding Base64 conversion is added in the encryption process, and the base64 is decoded first in decryption

Complete code for encryption and decryption:

package com.cmit.hall.plat.play.utils;

import java.security.GeneralSecurityException;
import java.security.Key;
import java.util.Base64;

import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;

import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.binary.Hex;

/**
 * 数据加密 DES方式 + Base64
 * @author sun_flower
 *
 */
public class EncryUtils {
  public static final String KEY = "gEpCIKFVdPEBJ1pM5pLSviM2Nrj5C/A4iAw8ou+jiJpnrXigolapdcJXfmh2tECyuQnaFrvZHabcdefghijklmnabcdefghijklmnabcdefghijklmnabcdefghijklmn";
  /**
   * 测试
   * @param args
   * @throws Exception
   */
  public static void main(String[] args) throws Exception {
    Key convertSecretKey = generateSecret(KEY);
    String data = "{\"code\":\"100\",\"roleId\":[],\"userDesc\":\"测试\",\"sessionId\":\"90EA80C89F6187BAB363C9347F759E39\",\"roleList\":[],\"userName\":\"chenpeng\",\"checkCode\":\"\",\"token\":\"\",\"password\":\"eFEBcXRwTW2oMFSDwGwUKQ==\",\"createTime\":\"2019-05-27 15:30:14\",\"levelId\":\"1\",\"staffName\":\"\",\"id\":1502,\"userType\":\"1\",\"oldPwd\":\"\"}";
    String enStr = encodeString(convertSecretKey,data);
    decodeString(convertSecretKey,enStr);
  }
  /**
   * 转换key
   * @param key
   * @return
   * @throws GeneralSecurityException
   */
  public static Key generateSecret(String key) throws GeneralSecurityException {
    byte[] bytesKey = key.getBytes();
    DESKeySpec desKeySpec = new DESKeySpec(bytesKey);//实例化DESKey秘钥的相关内容
    SecretKeyFactory factory = SecretKeyFactory.getInstance("DES");//实例一个秘钥工厂，指定加密方式
    Key convertSecretKey = factory.generateSecret(desKeySpec);
    return convertSecretKey;
  }
  /**
   * 加密
   * @param convertSecretKey
   * @param date
   * @return
   * @throws GeneralSecurityException
   */
  public static String encodeString(Key convertSecretKey,String data) throws GeneralSecurityException {
    Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");//通过Cipher这个类进行加解密相关操作
    cipher.init(Cipher.ENCRYPT_MODE,convertSecretKey);
    byte[] enData = Base64.getEncoder().encode(data.getBytes());
    byte[] result = cipher.doFinal(enData);//输入要加密的内容
    System.out.println("加密的结果：" + Hex.encodeHexString(result));
    return Hex.encodeHexString(result);

  }

  /**
   * 解密
   * @param convertSecretKey
   * @param date
   * @return
   * @throws GeneralSecurityException
   * @throws DecoderException
   */
  public static String decodeString(Key convertSecretKey,String data) throws GeneralSecurityException,DecoderException {
    Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");//通过Cipher这个类进行加解密相关操作
    cipher.init(Cipher.DECRYPT_MODE,convertSecretKey);
    byte[] hdata = Hex.decodeHex(data.tocharArray());
    byte[] result = cipher.doFinal(hdata);
    byte[] decode = Base64.getDecoder().decode(result);
    System.out.println("解密结果：" + new String(decode));
    return new String(decode);
  }
}

The above is the whole content of this article. I hope it will help you in your study, and I hope you will support us a lot.