NNTPCryptography.py 文件源码

def private_pem(self, password=None):
        """
        Returns the private key PEM. This is a base64 format with delimiters.

        This function returns None if the private pem information could
        not be acquired.
        """
        if not isinstance(self.private_key, RSAPrivateKey):
            return None

        if password is None:
            password = self.password

        if password:
            return self.private_key.private_bytes(
               encoding=serialization.Encoding.PEM,
               format=serialization.PrivateFormat.PKCS8,
               encryption_algorithm=serialization
                       .BestAvailableEncryption(password)
            )

        return self.private_key.private_bytes(
            encoding=serialization.Encoding.PEM,
            format=serialization.PrivateFormat.TraditionalOpenSSL,
            encryption_algorithm=serialization.NoEncryption(),
        )