当我解密加密消息时，我收到此错误。我从 django 视图中的数据库获取了加密消息，pw = donator.objects.filter(emai=email).values('passw')并在解密消息（）函数中传递了 pw 对象。crypto_messag() 函数是：
def decrypt_message(encrypted_message,key):
"""
Decrypts an encrypted message
"""
f = Fernet(key)
decrypted_message = f.decrypt(encrypted_message)
return decrypted_message.decode()
错误信息是：
File "C:\Users\Neelesh Singh\workspace\BookHouse\donatorapp\views.py", line 129, in decrypt_message
f = Fernet(key)
File "C:\Users\Neelesh Singh\AppData\Local\Programs\Python\Python39\lib\site-packages\cryptography\fernet.py", line 37, in __init__
key = base64.urlsafe_b64decode(key)
File "C:\Users\Neelesh Singh\AppData\Local\Programs\Python\Python39\lib\base64.py", line 131, in urlsafe_b64decode
s = _bytes_from_decode_data(s)
File "C:\Users\Neelesh Singh\AppData\Local\Programs\Python\Python39\lib\base64.py", line 45, in _bytes_from_decode_data
raise TypeError("argument should be a bytes-like object or ASCII "
TypeError: argument should be a bytes-like …我正在研究一个基于 python 后端的项目。我将使用 Django 来处理“核心”内容，使用 FastAPI 来处理一些爬虫。Fernet我正在使用模块和自定义Django 将一些数据加密到数据库中Field。
class EncryptedField(models.CharField):
description = "Save encrypted data to DB an read as string on application level."
def __init__(self, *args, **kwargs):
kwargs["max_length"] = 1000
super().__init__(*args, **kwargs)
@cached_property
def fernet(self) -> Fernet:
return Fernet(key=settings.FERNET_KEY)
def get_internal_type(self) -> str:
return "BinaryField"
def get_db_prep_save(
self, value: Any, connection: BaseDatabaseWrapper
) -> Union[memoryview, None]:
value = super().get_db_prep_save(value, connection)
if value is not None:
encrypted_value = self.fernet.encrypt(data=force_bytes(s=value))
return connection.Database.Binary(encrypted_value)
def from_db_value(self, value: bytes, *args) …