微信小程序开放数据校验与解密Java版 Java微信小程序获取用户信息和手机号码解密Java版

曾经终败给现在 2022-12-10 10:25 196阅读 0赞

## 微信小程序 开放数据校验与解密Java版 Java微信小程序获取用户信息和手机号码解密Java版 ##

**一、依赖pom**

<dependency>
 <groupId>commons-codec</groupId>
 <artifactId>commons-codec</artifactId>
 <version>1.15</version>
 </dependency>
 
 
 	<dependency>
 	 <groupId>org.bouncycastle</groupId>
 	 <artifactId>bcprov-jdk16</artifactId>
 	 <version>1.46</version>
 	</dependency>

**二、代码如下**

import java.security.AlgorithmParameters;
 import java.security.Key;
 import java.security.Security;
 
 import javax.crypto.Cipher;
 import javax.crypto.KeyGenerator;
 import javax.crypto.spec.IvParameterSpec;
 import javax.crypto.spec.SecretKeySpec;
 
 import org.apache.commons.codec.binary.Base64;
 
 
 /**
 * description: 微信小程序 --- 获取用户信息解密
 * @version v1.0
 * @author w
 * @date 2020年9月24日下午4:00:15
 * @see 
 **/
 
 public class WechatUtils {
 	
 	public static final String AES = "AES";
 	public static final String AES_CBC_PADDING = "AES/CBC/PKCS7Padding";
 
 	/**
 *开放数据校验与解密 
 *对称解密使用的算法为 AES-128-CBC，数据采用PKCS#7填充 
 *对称解密的目标密文:encrypted=Base64_Decode(encryptData) 
 *对称解密秘钥:key = Base64_Decode(session_key),aeskey是16字节 
 *对称解密算法初始向量:iv = Base64_Decode(iv),同样是16字节 
 *@param encrypted 目标密文
 *@param session_key 会话ID
 *@param iv 加密算法的初始向量
 *@see https://developers.weixin.qq.com/miniprogram/dev/framework/open-ability/signature.html
 */
 public static String wxDecrypt(String encrypted, String session_key, String iv) {
 String result = null;
 byte[] encrypted64 = Base64.decodeBase64(encrypted);
 byte[] key64 = Base64.decodeBase64(session_key);
 byte[] iv64 = Base64.decodeBase64(iv);
 try {
 init();
 result = new String(decrypt(encrypted64, key64, generateIV(iv64)));
 } catch (Exception e) {
 e.printStackTrace();
 }
 return result;
 }
 	 
 
 	 
 /**
 * description: 初始化密钥
 * @throws Exception
 * @return void
 * @version v1.0
 * @author w
 * @date 2020年9月9日 下午5:07:04
 */
 public static void init() throws Exception {
 Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
 KeyGenerator.getInstance(AES).init(128);
 }
 
 /**
 * description: 生成iv
 * @param iv
 * @throws Exception
 * @return AlgorithmParameters
 * @version v1.0
 * @author w
 * @date 2020年9月10日 下午3:50:35
 */
 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(AES);
 params.init(new IvParameterSpec(iv));
 return params;
 }
 
 /**
 * description: 执行解密操作
 * @param encryptedData 加密后的字符串
 * @param keyBytes 密钥key
 * @param iv 便宜向量iv
 * @throws Exception
 * @return byte[]
 * @version v1.0
 * @author w
 * @date 2020年9月10日 下午3:51:10
 */
 public static byte[] decrypt(byte[] encryptedData, byte[] keyBytes, AlgorithmParameters iv)throws Exception {
 Key key = new SecretKeySpec(keyBytes, AES);
 Cipher cipher = Cipher.getInstance(AES_CBC_PADDING);
 // 设置为解密模式
 cipher.init(Cipher.DECRYPT_MODE, key, iv);
 return cipher.doFinal(encryptedData);
 }
 	 
 }

**三、测试**

1、加密数据来源：微信提供的[官方解密示例代码中][Link 1]，[点击下载][Link 2]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hhSGFfU2ly_size_16_color_FFFFFF_t_70][]

2、测试代码如下：

public static void main(String[] args) {
    		String appid = "wx4f4bc4dec97d474b";
    		String sessionKey = "tiihtNczf5v6AKRyjwEUhQ==";
    		String encryptedData = "CiyLU1Aw2KjvrjMdj8YKliAjtP4gsMZM"+
    							"QmRzooG2xrDcvSnxIMXFufNstNGTyaGS"+
    							"9uT5geRa0W4oTOb1WT7fJlAC+oNPdbB+"+
    							"3hVbJSRgv+4lGOETKUQz6OYStslQ142d"+
    							"NCuabNPGBzlooOmB231qMM85d2/fV6Ch"+
    							"evvXvQP8Hkue1poOFtnEtpyxVLW1zAo6"+
    							"/1Xx1COxFvrc2d7UL/lmHInNlxuacJXw"+
    							"u0fjpXfz/YqYzBIBzD6WUfTIF9GRHpOn"+
    							"/Hz7saL8xz+W//FRAUid1OksQaQx4CMs"+
    							"8LOddcQhULW4ucetDf96JcR3g0gfRK4P"+
    							"C7E/r7Z6xNrXd2UIeorGj5Ef7b1pJAYB"+
    							"6Y5anaHqZ9J6nKEBvB4DnNLIVWSgARns"+
    							"/8wR2SiRS7MNACwTyrGvt9ts8p12PKFd"+
    							"lqYTopNHR1Vf7XjfhQlVsAJdNiKdYmYV"+
    							"oKlaRv85IfVunYzO0IKXsyl7JCUjCpoG"+
    							"20f0a04COwfneQAGGwd5oa+T8yO5hzuy"+
    							"Db/XcxxmK01EpqOyuxINew==" ;
    						
    		String iv = "r7BXXKkLb8qrSNn05n0qiA==";
    		
    		String wxDecrypt = wxDecrypt(encryptedData, sessionKey, iv);
    		System.out.println(wxDecrypt);
    	}

3、解密结果如下：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hhSGFfU2ly_size_16_color_FFFFFF_t_70 1][]

和官方解密结果一致，解密成功~

参考资料：[JAVA 微信小程序获取用户信息和手机号码解密][JAVA]

[Link 1]: https://developers.weixin.qq.com/miniprogram/dev/framework/open-ability/signature.html#%E5%8A%A0%E5%AF%86%E6%95%B0%E6%8D%AE%E8%A7%A3%E5%AF%86%E7%AE%97%E6%B3%95
[Link 2]: https://res.wx.qq.com/wxdoc/dist/assets/media/aes-sample.eae1f364.zip
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hhSGFfU2ly_size_16_color_FFFFFF_t_70]: /images/20221123/1bfb9937e12449289520a53e1dea5ace.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hhSGFfU2ly_size_16_color_FFFFFF_t_70 1]: /images/20221123/90d49726f0364949bdce21e0ddc98107.png
[JAVA]: https://blog.csdn.net/NepalTrip/article/details/90447798