from typing import Union

Buffer = Union[bytes, bytearray, memoryview]

class RsyncError(Exception):
    pass

class Hasher:
    def __init__(self, which: str, data: Buffer = b''): ...
    def update(self, data: Buffer) -> None: ...
    def reset(self) -> None: ...
    def digest(self) -> bytes: ...
    def hexdigest(self) -> str: ...

    @property
    def digest_size(self) -> int: ...
    @property
    def block_size(self) -> int: ...
    @property
    def name(self) -> str: ...