NNTPCryptography.py 文件源码

def public_pem(self):
        """
        Returns the public key PEM. This is a base64 format with delimiters.

        This function returns None if the public pem information could
        not be acquired.

        """
        if not isinstance(self.public_key, RSAPublicKey):
            if not isinstance(self.private_key, RSAPrivateKey):
                return None
            self.public_key = self.private_key.public_key()

        return self.public_key.public_bytes(
            encoding=serialization.Encoding.PEM,
            format=serialization.PublicFormat.SubjectPublicKeyInfo,
        )