Python解密Token报错：AES-GCM缺少认证标签求协助

问题背景 #

我需要解密一个Chrome风格的加密Token，具体信息如下：

• 待解密Token：

djEwe5t74Rc5Ded4Ozm++rCKmYTCd7wxI1X6L1GywnslmeUs4240q72bcuotAMSp2p3S2ovrqQoFLRNJ9GzelmF+beLrVJfPnT7cdg+7e+ZRYBfn9uiTL/4VkL8Sp24TTgoVrDA+gg==

• 加密密钥（Chrome os_crypt格式）：

{"os_crypt":{"encrypted_key":"RFBBUEkBAAAA0Iyd3wEV0RGMegDAT8KX6wEAAACwiiOT7hVKSpqHHKmfelp6AAAAAAIAAAAAABBmAAAAAQAAIAAAAEr1FtZCawv6cT1z5zzXxZ30h4O7Ity3EBLfTdtM0oO6AAAAAA6AAAAAAgAAIAAAACpGZwsT0RKSCl/ukX6ZxNytKpAbHgRmqLqpRW++TcxEMAAAAC8HEpNDthKadJlMBCAvonE1QXVGTjE4Hh0TJv75iz48R2eb93lG9zxpr8xhh1C7e0AAAAAWODcIFOqibQmHRL/fnDgtFy7JdNC7NynDGMtcucS4R5yD92+2UFPFquqfEbpu/gIW5eMv3LQIQDJlR5I53KRs"}}

错误信息 #

运行解密脚本时抛出如下错误：

Traceback (most recent call last):
  File "C:\Users\Oscar\OneDrive\Escritorio\read-leveldb\prube2.py", line 40, in <module>
    token_desencriptado = decrypt_val(buff, master_key)
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Oscar\OneDrive\Escritorio\read-leveldb\prube2.py", line 18, in decrypt_val
    decrypted_pass += decryptor.finalize()
                      ^^^^^^^^^^^^^^^^^^^^
  File "C:\Python312\Lib\site-packages\cryptography\hazmat\primitives\ciphers\base.py", line 227, in finalize
    data = self._ctx.finalize()
           ^^^^^^^^^^^^^^^^^^^^
  File "C:\Python312\Lib\site-packages\cryptography\hazmat\backends\openssl\ciphers.py", line 190, in finalize
    raise ValueError(
ValueError: Authentication tag must be provided when decrypting.

已尝试的解决方法 #

• 明确错误原因：加密Token缺少解密所需的认证标签
• 修改解密代码逻辑为decrypted_pass = decryptor.update(payload) + decryptor.finalize()，但问题仍未解决

注：上传时已对原始Token做了修改，需要协助完成解密并解决认证标签问题。

内容的提问来源于stack exchange，提问作者mdz