解析微信小程序手机号异常 Exception:javax.cry

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；

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

/**

• @Description TODO
• @Author jizhuolin
• @Date 2018/9/28
  /
  public class WxMiniappUtils {
  /

  • 解密用户手机号算法

  • @param sessionkey 小程序登录sessionKey

  • @param iv 向量

  • @param encryptedData

  • @return

  • @throws NoSuchPaddingException

  • @throws NoSuchAlgorithmException

  • @throws InvalidAlgorithmParameterException

  • @throws InvalidKeyException

  • @throws BadPaddingException

  • @throws IllegalBlockSizeException
    */
    public static byte[] decrypt(byte[] sessionkey, byte[] iv, byte[] encryptedData)
    throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException,
    InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
    AlgorithmParameterSpec ivSpec = new IvParameterSpec(iv);

    byte[] data = null;
    try {
    Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
    SecretKeySpec keySpec = new SecretKeySpec(sessionkey, "AES");
    cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
    data = cipher.doFinal(encryptedData);
    }catch (Exception e){
    Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
    SecretKeySpec keySpec = new SecretKeySpec(sessionkey, "AES");
    cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
    data = cipher.doFinal(encryptedData);
    }

    return data;
    }
    }