Export a public key in PEM-format

		:return: bytes

def export_public_key(self):
		""" Export a public key in PEM-format

		:return: bytes
		"""
		if self.__public_key is None:
			raise ValueError('Unable to call this method. Public key must be set')

		return self.__public_key.public_bytes(
			encoding=serialization.Encoding.PEM,
			format=serialization.PublicFormat.SubjectPublicKeyInfo
		)