java 后端解密获取微信的unionId

一、创建 解密代码类

 

import java.security.AlgorithmParameters;import java.security.InvalidAlgorithmParameterException;import java.security.InvalidKeyException;import java.security.Key;import java.security.NoSuchAlgorithmException;import java.security.NoSuchProviderException;import java.security.Security;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 org.bouncycastle.jce.provider.BouncyCastleProvider; public class AES{ public static boolean initialized = false; /** * AES对称解密工具类 * * @param content * 密文 * @return * @throws InvalidAlgorithmParameterException * @throws NoSuchProviderException */ public byte[] decrypt(byte[] content, byte[] keyByte, byte[] ivByte) throws InvalidAlgorithmParameterException { initialize(); try { // java是没有 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) { e.printStackTrace(); } catch (Exception e) { 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; }

二、创建测试类

/** * 如果有,直接返回 ,程序结束 * 如果没有,将用于解密的session_key获取 * 传入encryptedData等加密数据 * 对加密数据进行逆解密 * 拿到unionID 返回,程序结 * * userInfo TODO 注意一下：通过user.getInfo获取的和通过button授权获取的格式不一样 * */public static void main(String[] args) { Map<String, String> resUserInfo = new HashMap<>(); String session_key="XXX"; // 参考微信开发文档中根据code获取session_key String iv = "XXX"; // 微信小程序中调用getUserInfo方法时微信返给的 e.detail.iv String encryptedData ="XXX"; // 被加密的数据，微信小程序中调用getUserInfo方法时微信返给的e.detail.encryptedData byte[] dataByte = Base64.decodeBase64(encryptedData); // 加密秘钥 byte[] keyByte = Base64.decodeBase64(session_key); // 偏移量 byte[] ivByte = Base64.decodeBase64(iv); String newuserInfo = ""; try { AES aes = new AES(); byte[] resultByte = aes.decrypt(dataByte, keyByte, ivByte); if (null != resultByte && resultByte.length > 0) { newuserInfo = new String(resultByte, "UTF-8"); System.out.println("获取到的unionId:"+JSONObject.parseObject(newuserInfo).get("unionId")); } } catch (Exception e) { e.printStackTrace(); }}

3、导入所需要的jar

https://download.csdn.net/download/qq_33238562/11311800

4、 增加依赖

<dependency> <groupId>org.bouncycastle</groupId> <artifactId>bcprov-jdk15on</artifactId> <version>1.55</version></dependency>