解析微信小程序手機號異常 Exception:javax.crypto.BadPaddingException: Given final block not properly padded

Exception:javax.crypto.BadPaddingException: Given final block not properly padded. Such issues can arise if a bad key is used during decryption.
偶發性異常：沒登陸時用AES/CBC/PKCS7Padding，登陸後用AES/CBC/PKCS5Padding；

 

public static String decrypt(String keyStr, String ivStr, String encDataStr)throws Exception {
        try {
            logger.info("使用 AES/CBC/PKCS5Padding 解密手機號");
            byte[] encData = Base64Util.decode(encDataStr);
            byte[] iv =Base64Util.decode(ivStr);
            byte[] key = Base64Util.decode(keyStr);
            AlgorithmParameterSpec ivSpec = new IvParameterSpec(iv);
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            SecretKeySpec keySpec = new SecretKeySpec(key, "AES");
            cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
            return new String(cipher.doFinal(encData),"UTF-8");
        }catch (Exception e){
            logger.info("使用 AES/CBC/PKCS7Padding 解密手機號");
            byte[] encData = Base64Util.decode(encDataStr);
            byte[] iv =Base64Util.decode(ivStr);
            byte[] key = Base64Util.decode(keyStr);
            AlgorithmParameterSpec ivSpec = new IvParameterSpec(iv);
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
            SecretKeySpec keySpec = new SecretKeySpec(key, "AES");
            cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
            return new String(cipher.doFinal(encData),"UTF-8");
        }
    }