--- /dev/null
+from abc import ABCMeta, abstractmethod
+
+from cryptography.hazmat.primitives.serialization import Encoding, KeySerializationEncryption, PrivateFormat, PublicFormat
+
+class X448PrivateKey(metaclass=ABCMeta):
+ @classmethod
+ def from_private_bytes(cls, data: bytes) -> X448PrivateKey: ...
+ @classmethod
+ def generate(cls) -> X448PrivateKey: ...
+ @abstractmethod
+ def exchange(self, peer_public_key: X448PublicKey) -> bytes: ...
+ @abstractmethod
+ def private_bytes(
+ self, encoding: Encoding, format: PrivateFormat, encryption_algorithm: KeySerializationEncryption
+ ) -> bytes: ...
+ @abstractmethod
+ def public_key(self) -> X448PublicKey: ...
+
+class X448PublicKey(metaclass=ABCMeta):
+ @classmethod
+ def from_public_bytes(cls, data: bytes) -> X448PublicKey: ...
+ @abstractmethod
+ def public_bytes(self, encoding: Encoding, format: PublicFormat) -> bytes: ...