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import abc
from noiseprotocol.constants import MAX_NONCE
class Cipher(metaclass=abc.ABCMeta):
def __init__(self):
self.cipher = None
@property
@abc.abstractmethod
def klass(self):
raise NotImplementedError
@abc.abstractmethod
def encrypt(self, k, n, ad, plaintext):
raise NotImplementedError
@abc.abstractmethod
def decrypt(self, k, n, ad, ciphertext):
raise NotImplementedError
def rekey(self, k):
return self.encrypt(k, MAX_NONCE, b'', b'\x00' * 32)[:32]
def initialize(self, key):
self.cipher = self.klass(key)
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