微信小程序用户数据解密

微信小程序用户数据解密" style="margin: 0.8em 0px; padding: 0px; box-sizing: border-box; font-weight: 100; color: rgb(85, 85, 85); line-height: 35px; background-color: rgb(255, 255, 255);">微信小程序用户数据解密

参考链接：

官方文档

官方指引图

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按照官方引导图一步一步操作

1、获取code

onLoad: function (options) {
    // 页面初始化 options为页面跳转所带来的参数
    let that = this
    wx.login({
      success: function (res) {
        // success
        let code = res.code
        that.setData({ code: code })
        wx.getUserInfo({
          success: function (res) {
            // success
            that.setData({ userInfo: res.userInfo })
            that.setData({ iv: res.iv })
            that.setData({ encryptedData: res.encryptedData })
            that.get3rdSession()
          }
        })
      }
  })
}

2、发送code到第三方服务器，获取3rd_session

get3rdSession:function(){
    let that = this
    wx.request({
      url: 'https://localhost:8443/get3rdSession',
      data: {
        code: this.data.code
      },
      method: 'GET', // OPTIONS, GET, HEAD, POST, PUT, DELETE, TRACE, CONNECT
      // header: {}, // 设置请求的 header
      success: function (res) {
        // success
        var sessionId = res.data.session;
        that.setData({ sessionId: sessionId })
        wx.setStorageSync('sessionId', sessionId)
        that.decodeUserInfo()
      }
    })
  }

3、在第三方服务器上发送appid、appsecret、code到微信服务器换取session_key和openid

这里使用JFinal搭建的服务器

Redis配置

public void configPlugin(Plugins me) {
    //用于缓存userinfo模块的redis服务
    RedisPlugin userInfoRedis = new RedisPlugin("userInfo","localhost");
    me.add(userInfoRedis);
}

获取第三方session

public void get3rdSession() {
    //获取名为userInfo的Redis Cache对象
    Cache userInfoCache = Redis.use("userInfo");
    String sessionId = "";
    JSONObject json = new JSONObject();
    String code = getPara("code");
    String url = "" + code + "&grant_type=authorization_code";
    //执行命令生成3rd_session
    String session = ExecLinuxCMDUtil.instance.exec("cat /dev/urandom |od -x | tr -d ' '| head -n 1").toString();
    json.put("session", session);
    //创建默认的httpClient实例
    CloseableHttpClient httpClient = getHttpClient();
    try {
        //用get方法发送http请求
        HttpGet get = new HttpGet(url);
        System.out.println("执行get请求:...." + get.getURI());
        CloseableHttpResponse httpResponse = null;
        //发送get请求
        httpResponse = httpClient.execute(get);
        try {
            //response实体
            HttpEntity entity = httpResponse.getEntity();
            if (null != entity) {
                String result = EntityUtils.toString(entity);
                System.out.println(result);
                JSONObject resultJson = JSONObject.fromObject(result);
                String session_key = resultJson.getString("session_key");
                String openid = resultJson.getString("openid");
                //session存储
                userInfoCache.set(session,session_key+","+openid);
                }
            } finally {
                httpResponse.close();
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                closeHttpClient(httpClient);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        renderJson(json);
}
private CloseableHttpClient getHttpClient() {
    return HttpClients.createDefault();
}
private void closeHttpClient(CloseableHttpClient client) throws IOException {
    if (client != null) {
        client.close();
    }
}

ExecLinuxCMDUtil.Java

import java.io.InputStreamReader;
import java.io.LineNumberReader;
/**
 * java在linux环境下执行linux命令，然后返回命令返回值。
 * Created by LJaer on 16/12/22.
 */
public class ExecLinuxCMDUtil {
    public static final  ExecLinuxCMDUtil instance = new ExecLinuxCMDUtil();
    public static Object exec(String cmd) {
        try {
            String[] cmdA = { "/bin/sh", "-c", cmd };
            Process process = Runtime.getRuntime().exec(cmdA);
            LineNumberReader br = new LineNumberReader(new InputStreamReader(
                    process.getInputStream()));
            StringBuffer sb = new StringBuffer();
            String line;
            while ((line = br.readLine()) != null) {
                System.out.println(line);
                sb.append(line).append("\n");
            }
            return sb.toString();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
}

4、解密用户数据

decodeUserInfo:function(){
    let that = this
    wx.request({
      url: 'https://localhost:8443/decodeUserInfo',
      data: {
        encryptedData: that.data.encryptedData,
        iv: that.data.iv,
        session: wx.getStorageSync('sessionId')
      },
      method: 'GET', // OPTIONS, GET, HEAD, POST, PUT, DELETE, TRACE, CONNECT
      // header: {}, // 设置请求的 header
      success: function (res) {
        // success
        console.log(res)
      }
    })
}

console输出结果：

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后端解密代码

/**
 * 解密用户敏感数据
 */
public void decodeUserInfo(){
    String encryptedData = getPara("encryptedData");
    String iv = getPara("iv");
    String session = getPara("session");
    //从缓存中获取session_key
    //获取名称为userInfo的Redis Cache对象
    Cache userInfoRedis = Redis.use("userInfo");
    Object wxSessionObj =  userInfoRedis.get(session);
    if(null==wxSessionObj){
        renderNull();
    }
    String wxSessionStr = (String)wxSessionObj;
    String session_key = wxSessionStr.split(",")[0];
    try {
        byte[] resultByte = AESUtil.instance.decrypt(Base64.decodeBase64(encryptedData), Base64.decodeBase64(session_key), Base64.decodeBase64(iv));
        if(null != resultByte && resultByte.length > 0){
            String userInfo = new String(resultByte, "UTF-8");
            System.out.println(userInfo);
            JSONObject json = JSONObject.fromObject(userInfo); //将字符串{“id”：1}
            renderJson(json);
        }
    } catch (InvalidAlgorithmParameterException e) {
        e.printStackTrace();
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    }
}

AESUtil.java

import org.bouncycastle.jce.provider.BouncyCastleProvider;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.security.*;
public class AESUtil {
    public static final AESUtil instance = new AESUtil();
    public static boolean initialized = false;
    /**
     * AES解密
     * @param content 密文
     * @return
     * @throws InvalidAlgorithmParameterException
     * @throws NoSuchProviderException
     */
    public byte[] decrypt(byte[] content, byte[] keyByte, byte[] ivByte) throws InvalidAlgorithmParameterException {
        initialize();
        try {
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
            Key sKeySpec = new SecretKeySpec(keyByte, "AES");
            cipher.init(Cipher.DECRYPT_MODE, sKeySpec, generateIV(ivByte));// 初始化
            byte[] result = cipher.doFinal(content);
            return result;
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        } catch (NoSuchProviderException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return null;
    }
    public static void initialize(){
        if (initialized) return;
        Security.addProvider(new BouncyCastleProvider());
        initialized = true;
    }
    //生成iv
    public static AlgorithmParameters generateIV(byte[] iv) throws Exception{
        AlgorithmParameters params = AlgorithmParameters.getInstance("AES");
        params.init(new IvParameterSpec(iv));
        return params;
    }
}