Java数据的简单加密 DES方式

Posted 2021-03-21 sun-flower1314

1.数据在网络中传输时，需要进行加密处理

双方约定一个相同的key（key不在网络中进行传输，只传输加密数据），然后根据将key根据一定的DES规则转换，得到真正的key，在进行加密和解密，为了增加安全性，加密过程中再加上编码base64转换，解密时先解码base64

加密和解密的完整的代码：

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);
    }
    
    
    
    
}