解析微信小程序手机号及异常Given final block not properly padded. Such issues can arise if a bad key is used ...

Exception:javax.crypto.BadPaddingException: Given final block not properly padded. Such issues can arise if a bad key is used during decryption.
偶发性异常：没登录时用AES/CBC/PKCS7Padding，登录后用AES/CBC/PKCS5Padding；

原因 : 微信小程序的sessionKey有一个过期时间5分钟;

解决 : 使用工具封装

package cn.s****t.utils;

import com.alibaba.fastjson.JSONObject;
import org.springframework.stereotype.Component;
import org.springframework.util.Base64Utils;

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.io.UnsupportedEncodingException;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.AlgorithmParameterSpec;

/**
 * @Author: roc_wl
 * @Date: 2019/9/26
 */
@Component//注入spring注解
public class WxMiniPhoneAnalysis {

    /**
     * 功能描述: 
 微信小程序解析手机号码 

     * @Param: [sessionkey, iv, encryptedData]
     * @Return: java.lang.String
     * @Author: roc_wl
     * @Date: 2019/9/26 16:25
     */
    public static String getWxMiniPhone(String sessionkey, String iv, String encryptedData)
            throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException,
            InvalidKeyException, BadPaddingException, IllegalBlockSizeException, UnsupportedEncodingException {

        byte[] encrypData = Base64Utils.decodeFromString(encryptedData);
        byte[] ivData = Base64Utils.decodeFromString(iv);
        byte[] sessionKey = Base64Utils.decodeFromString(sessionkey);
        String resultString = null;
        AlgorithmParameterSpec ivSpec = new IvParameterSpec(ivData);
        SecretKeySpec keySpec = new SecretKeySpec(sessionKey, "AES");
        try {
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
            resultString = new String(cipher.doFinal(encrypData), "UTF-8");
        } catch (Exception e) {
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
            cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
            resultString = new String(cipher.doFinal(encrypData), "UTF-8");
        }
        JSONObject object = JSONObject.parseObject(resultString);
        // 拿到手机号码
        String phone = object.getString("phoneNumber");
        return phone;
    }

}