Java简单数据加密方法DES实现过程解析

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);
  }
}