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# Copyright 2019 Google LLC.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Basic interface for wrapping a primitive."""
from __future__ import absolute_import
from __future__ import division
from __future__ import google_type_annotations
from __future__ import print_function
import abc
from typing import Generic, Type, TypeVar
from tink.python.core import primitive_set
P = TypeVar('P')
class PrimitiveWrapper(Generic[P]):
"""Basic interface for wrapping a primitive.
A PrimitiveSet can be wrapped by a single primitive in order to fulfill a
cryptographic task. This is done by the PrimitiveWrapper. Whenever a new
primitive type is added to Tink, the user should define a new PrimitiveWrapper
and register it by calling registry.registerPrimitiveWrapper().
"""
__metaclass__ = abc.ABCMeta
@abc.abstractmethod
def wrap(self, pset: primitive_set.PrimitiveSet) -> P:
"""Wraps a PrimitiveSet and returns a single primitive instance."""
pass
@abc.abstractmethod
def primitive_class(self) -> Type[P]:
"""Returns the primitive class of the primitive managed."""
pass