java后台解密微信小程序手机号

参考文档：
https://developers.weixin.qq.com/miniprogram/dev/framework/open-ability/login.html
https://developers.weixin.qq.com/miniprogram/dev/framework/open-ability/signature.html
https://developers.weixin.qq.com/miniprogram/dev/framework/open-ability/getPhoneNumber.html

①小程序端wx.login获取code

wx.login({
  success(res) {
    if (res.code) {
      // 发起网络请求
      wx.request({
        url: 'https://test.com/onLogin',
        data: {
          code: res.code
        }
      })
    } else {
      console.log('登录失败！' + res.errMsg)
    }
  }
})

②调用java后台获取session_key和openid

        /**
     * 获取openid和sessionKey方法
     * @param code
     * @return
     */
    private JSONObject getSessionKeyOrOpenId(String code){
        String tokenUrl = "https://api.weixin.qq.com/sns/jscode2session?appid=APPID&secret=SECRET&js_code=JSCODE&grant_type=authorization_code";
        tokenUrl = tokenUrl.replace("APPID",miniAppId).replace("SECRET",miniAppsecret).replace("JSCODE", code);
        String resultToken = restTemplateUtil.doGet(tokenUrl).getBody();
        JSONObject jsonObject = JSONUtil.parseObj(resultToken);
        return jsonObject;
    }

③根据前端传过来的sessionKey解密手机号做绑定或登录操作

/**
     * 微信小程序登录
     * @param miniLoginDto
     * @return
     */
    @PostMapping("/miniLogin")
    public Map<String, Object> miniLogin(@RequestBody MiniLoginDto miniLoginDto){
                  Map<String, Object>  reuslt = new HashMap();
        // 1.解析加密数据
        String phoneNumber = null;
        JSONObject userencryptedData = AES.wxDecrypt(miniLoginDto.getEncryptedData(),miniLoginDto.getSessionKey(), miniLoginDto.getIv());
        if (StringUtils.isNotBlank((String) userencryptedData.get("phoneNumber"))){
            phoneNumber = (String) userencryptedData.get("phoneNumber");
        }
              // 2.自己的登录 逻辑
        return reuslt ;
    }

注意：

可以将②和③放在一起，我这里没有成功，获取的sessionKey解密手机号一直报错，所有分三步来完成

pom

        <dependency>
            <groupId>org.bouncycastle</groupId>
            <artifactId>bcprov-jdk15on</artifactId>
            <version>1.59</version>
        </dependency>
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>4.4.5</version>
        </dependency>

用到的工具类:JSONUtil

import cn.hutool.json.JSONObject;
import cn.hutool.json.JSONUtil;
import org.apache.commons.codec.binary.Base64;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.security.AlgorithmParameters;
import java.security.Key;
import java.security.Security;

/**
 * @author xiaoqiang
 * @Description 参考博客找不到了--------------
 * @date 2019/5/7 15:44
 */
public class AES {
   
    // 算法名
    public static final String KEY_NAME = "AES";
    // 加解密算法/模式/填充方式
    // ECB模式只用密钥即可对数据进行加密解密，CBC模式需要添加一个iv
    public static final String CIPHER_ALGORITHM = "AES/CBC/PKCS7Padding";

    /**
     * 微信 数据解密<br/>
     * 对称解密使用的算法为 AES-128-CBC，数据采用PKCS#7填充<br/>
     * 对称解密的目标密文:encrypted=Base64_Decode(encryptData)<br/>
     * 对称解密秘钥:key = Base64_Decode(session_key),aeskey是16字节<br/>
     * 对称解密算法初始向量:iv = Base64_Decode(iv),同样是16字节<br/>
     *
     * @param encrypted 目标密文
     * @param session_key 会话ID
     * @param iv 加密算法的初始向量
     */
    public static JSONObject wxDecrypt(String encrypted, String session_key, String iv) {
        String json = null;
        byte[] encrypted64 = Base64.decodeBase64(encrypted);
        byte[] key64 = Base64.decodeBase64(session_key);
        byte[] iv64 = Base64.decodeBase64(iv);
        byte[] data;
        try {
            init();
            json = new String(decrypt(encrypted64, key64, generateIV(iv64)));
        } catch (Exception e) {
            System.out.println("解密微信手机号失败:" + e.getMessage());
        }
        return JSONUtil.parseObj(json);
    }

    /**
     * 初始化密钥
     */
    public static void init() throws Exception {
        Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
        KeyGenerator.getInstance(KEY_NAME).init(128);
    }

    /**
     * 生成iv
     */
    public static AlgorithmParameters generateIV(byte[] iv) throws Exception {
        // iv 为一个 16 字节的数组，这里采用和 iOS 端一样的构造方法，数据全为0
        // Arrays.fill(iv, (byte) 0x00);
        AlgorithmParameters params = AlgorithmParameters.getInstance(KEY_NAME);
        params.init(new IvParameterSpec(iv));
        return params;
    }

    /**
     * 生成解密
     */
    public static byte[] decrypt(byte[] encryptedData, byte[] keyBytes, AlgorithmParameters iv)
            throws Exception {
        Key key = new SecretKeySpec(keyBytes, KEY_NAME);
        Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
        // 设置为解密模式
        cipher.init(Cipher.DECRYPT_MODE, key, iv);
        return cipher.doFinal(encryptedData);
    }



}

import org.apache.poi.ss.formula.functions.T;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Component;
import org.springframework.util.MultiValueMap;
import org.springframework.web.client.RestTemplate;

import java.util.Map;

/**
 * @author xiaoqiang
 * @Description RestTemplate 工具类
 * @date 2019/4/22 11:10
 */
@Component
public class RestTemplateUtil {
    @Autowired
    private RestTemplate restTemplate;


    /**
     * DoGet方法
     * @param url 请求地址
     * @return 请求结果
     */
    public ResponseEntity<String> doGet(String url) {
        return restTemplate.getForEntity(url, String.class);
    }

    /**
     * DoGet方法
     * @param url 请求地址
     * @param responseType 返回类型
     * @return 请求结果
     */
    public ResponseEntity<T> doGet(String url, Class<T> responseType) {
        return restTemplate.getForEntity(url, responseType);
    }

    /**
     * DoPost方法
     * @param url 请求地址
     * @param httpHeaders 请求头
     * @param uriVariables 请求参数
     * @param responseType 返回类型
     * @return
     */
    @SuppressWarnings({ "rawtypes", "unchecked" })
    public ResponseEntity<T> doPost(String url, HttpHeaders httpHeaders, Map<String, ?> uriVariables, Class<T> responseType) {
        /* 请求头 */
        MultiValueMap headers = null;
        if(httpHeaders == null) {
            headers = new HttpHeaders();
        }else {
            headers = httpHeaders;
        }
        /* 请求内容封装成HttpEntity */
        HttpEntity httpEntity= new HttpEntity(uriVariables, headers);
        return restTemplate.postForEntity(url, httpEntity, responseType);
    }

    /**
     * DoPost方法
     * @param url 请求地址
     * @param params 请求参数
     * @param responseType 返回类型
     * @return
     */
    public ResponseEntity<T> doPost(String url, String params, Class<T> responseType) {
        /* 请求内容封装成HttpEntity */
        HttpEntity<String> httpEntity= new HttpEntity<String>(params);
        return restTemplate.postForEntity(url, httpEntity, responseType);
    }
}