keystore.py 文件源码

def __save(self, private_key, file_name):
        if not isinstance(private_key, RSAPrivateKey):
            raise TypeError("private_key must be an instance of RSAPrivateKey, "
                            "actual: {}".format(type(private_key).__name__))

        pem = private_key.private_bytes(
            serialization.Encoding.PEM,
            serialization.PrivateFormat.PKCS8,
            serialization.BestAvailableEncryption(self.__key_store_passphrase))

        file_path = os.path.join(self.key_store_path, file_name)
        if not os.path.isdir(self.key_store_path):
            os.makedirs(self.key_store_path)

        if os.path.isfile(file_path):
            msg = "Save failed: A key with name [{}] already exists".format(
                file_name)
            raise IOError(msg)

        with open(file_path, 'w') as f:
            f.write(pem.decode(encoding='utf8'))