init.py
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init.py
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	from abc import ABC, abstractmethod


	VERSION = 1

	cache = { }


	def get_handler(version=None):
	if not version:
	version = VERSION

	if version not in cache:
	try:
	exec(f'from .v{version} import Handler as Crypto_v{version}')
	exec(f'cache[{version}] = Crypto_v{version}')

	except ModuleNotFoundError as e:
	cache[version] = e

	handler = cache[version]

	if isinstance(handler, Exception):
	raise ValueError(f'crypto handler version {version}') from handler

	return handler()


	class Handler(ABC):
	@abstractmethod
	def make_keys(self, password=None):
	raise NotImplementedError()

	@abstractmethod
	def load_private_key(self, key_pair_pem, password=None):
	raise NotImplementedError()

	@abstractmethod
	def load_public_key(self, key_pair_pem):
	raise NotImplementedError()

	@abstractmethod
	def encrypt(self, pub_key, data):
	raise NotImplementedError()

	@abstractmethod
	def decrypt(self, priv_key, data):
	raise NotImplementedError()

	@abstractmethod
	def sign(self, priv_key, data):
	raise NotImplementedError()

	@abstractmethod
	def verify(self, pub_key, data, signature):
	raise NotImplementedError()