python binascii.Error: Incorrect padding

亦凉 2023-07-09 02:04 4阅读 0赞

*  在有些字符串base64解码的时候可能会报错 `Incorrect padding`报错如下:

Traceback (most recent call last):
      File "/home/zzq/software/pycharm-2017.2.7/helpers/pydev/pydevd.py", line 1599, in <module>
        globals = debugger.run(setup['file'], None, None, is_module)
      File "/home/zzq/software/pycharm-2017.2.7/helpers/pydev/pydevd.py", line 1026, in run
        pydev_imports.execfile(file, globals, locals)  # execute the script
      File "/home/zzq/software/pycharm-2017.2.7/helpers/pydev/_pydev_imps/_pydev_execfile.py", line 18, in execfile
        exec(compile(contents+"\n", file, 'exec'), glob, loc)
      File "/home/zzq/work/self/public-script/generic/ssr_update.py", line 156, in <module>
        ssr_account3()
      File "/home/zzq/work/self/public-script/generic/ssr_update.py", line 146, in ssr_account3
        ssr_info = str(base64.b64decode(content.text),
      File "/usr/local/python3.5/lib/python3.5/base64.py", line 88, in b64decode
        return binascii.a2b_base64(s)
    binascii.Error: Incorrect padding

*  有可能是python base64库编码规则不太统一导致的；解决办法就是对base64解码的string补齐等号就可以了；　python中base64串的长度需为4的整数倍，故对长度不为4整数倍的base64串需要用"='补足

def decode_base64(data):
        """Decode base64, padding being optional. :param data: Base64 data as an ASCII byte string :returns: The decoded byte string. """
        missing_padding = 4 - len(data) % 4
        if missing_padding:
            data += '='* missing_padding
        return str(base64.b64decode(data),
                               encoding='utf-8')

*  这回把加密字符串传过去就没报错了  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2JhaWR1XzE5NDczNTI5_size_16_color_FFFFFF_t_70]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2JhaWR1XzE5NDczNTI5_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/2020022709150667.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2JhaWR1XzE5NDczNTI5,size_16,color_FFFFFF,t_70