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from typing import Union, overload
Buffer = Union[bytes, bytearray, memoryview]
def _HChaCha20(key: Buffer, nonce: Buffer) -> bytearray: ...
class ChaCha20Cipher:
block_size: int
nonce: bytes
def __init__(self, key: Buffer, nonce: Buffer) -> None: ...
@overload
def encrypt(self, plaintext: Buffer) -> bytes: ...
@overload
def encrypt(self, plaintext: Buffer, output: Union[bytearray, memoryview]) -> None: ...
@overload
def decrypt(self, plaintext: Buffer) -> bytes: ...
@overload
def decrypt(self, plaintext: Buffer, output: Union[bytearray, memoryview]) -> None: ...
def seek(self, position: int) -> None: ...
def new(key: Buffer, nonce: Buffer = ...) -> ChaCha20Cipher: ...
block_size: int
key_size: int
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