从断言中解码 JWT - Google 登录

Question

我正在尝试在 Actions on Google 中实现帐户链接（使用此）

我被困在其中的处理自动链接步骤。assertion当我尝试使用此处指定的python-jose库对其进行解码时，我收到了请求！

from jose import jwt

key = "728f4016652079b9ed99861bb09bafc5a45baa86" # PUBLIC KEY OF GOOGLE from https://www.googleapis.com/oauth2/v3/certs

encoded = "ENCODED_ASSERTION"

decoded = jwt.decode(encoded, key, algorithms='RS256')

print (decoded)

当我运行此代码时，它显示

Traceback (most recent call last):

File "/Users/jay.patel/env372/lib/python3.7/site-packages/jose/backends/pycrypto_backend.py", line 72, in __init__

    self.prepared_key = RSA.importKey(key)

  File "/Users/jay.patel/env372/lib/python3.7/site-packages/Crypto/PublicKey/RSA.py", line 757, in import_key

    raise ValueError("RSA key format is not supported")

ValueError: RSA key format is not supported

During handling of the above exception, another exception occurred:

Traceback (most recent call last):

  File "/Users/jay.patel/PycharmProjects/Prac/jwt.py", line 19, in <module>

    decoded = jwt.decode(encoded, key, algorithms='RS256')

  File "/Users/jay.patel/env372/lib/python3.7/site-packages/jose/jwt.py", line 135, in decode

    payload = jws.verify(token, key, algorithms, verify=verify_signature)

  File "/Users/jay.patel/env372/lib/python3.7/site-packages/jose/jws.py", line 77, in verify

    _verify_signature(signing_input, header, signature, key, algorithms)

  File "/Users/jay.patel/env372/lib/python3.7/site-packages/jose/jws.py", line 264, in _verify_signature

    if not _sig_matches_keys(keys, signing_input, signature, alg):

我究竟做错了什么？？我刚刚使用了 RS256，因为它是在 Google 的公钥中指定的（以JWK或PEM格式提供）

PS 当我尝试使用算法解码此处的断言时，RS256它显示无效签名错误，如下图所示。