# Copyright (c) 2019-2023 r3w0p
# The following code can be redistributed and/or
# modified under the terms of the MIT License.
"""
Encryption for distributed `BoboCEP`.
"""
from abc import ABC, abstractmethod
from bobocep.dist.dist import BoboDistributedError
[docs]class BoboDistributedCryptoError(BoboDistributedError):
"""
A distributed crypto error.
"""
[docs]class BoboDistributedCrypto(ABC):
"""
Abstract class for distributed crypto.
"""
[docs] @abstractmethod
def encrypt(self, msg_str: str) -> bytes:
"""
:param msg_str: Message to encrypt.
:return: Encrypted message.
"""
[docs] @abstractmethod
def decrypt(self, msg_bytes: bytes) -> str:
"""
:param msg_bytes: Message to decrypt.
:return: Decrypted message.
"""
[docs] @abstractmethod
def end_bytes(self) -> bytes:
"""
:return: Bytes used to signify the end of every encrypted payload.
"""
[docs] @abstractmethod
def min_length(self) -> int:
"""
:return: The minimum possible length of an encrypted payload,
in number of bytes.
"""