JAVA 微信小程序AES解密数据 demo

这个链接是官方文档的地址，但是demo下载中没有java的demo

https://developers.weixin.qq.com/miniprogram/dev/framework/open-ability/signature.html

 

正好同事有个要用小程序拿到用户手机号的需求，需要AES-BCB进行数据解密

AES就不介绍了，大家自行找wiki了解

废话不多说，直接上demo吧

 

 

下面是对数据解密的工具类

 

package com.kilde.util;

import com.alibaba.fastjson.JSONObject;
import lombok.Data;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.security.AlgorithmParameters;
import java.security.Key;
import java.security.Security;
import java.util.Base64;

/**
 * 小程序 AES 解密工具
 * @author Kilde
 */
@Data
public class WXBizDataCrypt {

    private String appId;
    private String sessionKey;

    public WXBizDataCrypt(String appId, String sessionKey) {
        this.appId = appId;
        this.sessionKey = sessionKey;
    }


    /**
     * 解密成json
     * @param encryptedData
     * @param iv
     * @return
     */
    public JSONObject decrypt(String encryptedData, String iv) {
        byte[] encryptedDataDecode = Base64.getDecoder().decode(encryptedData);
        byte[] sessionKeyDecode = Base64.getDecoder().decode(this.sessionKey);
        byte[] ivDecode = Base64.getDecoder().decode(iv);
        Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
        byte[] decodeData = decode(encryptedDataDecode, sessionKeyDecode, ivDecode);
        String stringData = new String(decodeData);
        JSONObject jsonObject = JSONObject.parseObject(stringData);
        return jsonObject;
    }


    /**
     * 解密算法 AES-128-CBC
     * 填充模式 PKCS#7
     *
     * @param encryptedDataDecode 目标密文
     * @return
     * @throws Exception
     */
    private byte[] decode(byte[] encryptedDataDecode, byte[] sessionKeyDecode, byte[] iv) {
        try {
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
            Key sKeySpec = new SecretKeySpec(sessionKeyDecode, "AES");
            cipher.init(Cipher.DECRYPT_MODE, sKeySpec, generateIV(iv));// 初始化
            byte[] result = cipher.doFinal(encryptedDataDecode);
            return result;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * 处理iv
     *
     * @param iv
     * @return
     * @throws Exception
     */
    private AlgorithmParameters generateIV(byte[] iv) throws Exception {
        AlgorithmParameters params = AlgorithmParameters.getInstance("AES");
        params.init(new IvParameterSpec(iv));
        return params;
    }

}

下面是使用的demo

package com.kilde.demo;

import com.alibaba.fastjson.JSONObject;

public class Demo {


    public static void main(String[] args) {

        String appId = "wx4f4bc4dec97d474b";
        String sessionKey = "tiihtNczf5v6AKRyjwEUhQ==";
        String encryptedData = "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";
        String iv = "r7BXXKkLb8qrSNn05n0qiA==";

        WXBizDataCrypt pc = new WXBizDataCrypt(appId,sessionKey);
        JSONObject decrypt = pc.decrypt(encryptedData, iv);

        System.out.println(decrypt.toString());

    }

}

下面是运行后的返回结果

 

已经可以成功解密密文了。

还有一点需要注意，就是去甲骨文官网下载 对应你的版本的JCE包，然后更新到你的jdk->jre->lib->security包中

jdk1.8的jce更新包在这里，其他的大家自行寻找

https://pan.baidu.com/s/1Ab0Lp2QjyEPBIP2L64Pcqw

 

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