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#!/usr/bin/env python3
# Copyright 2020 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
#
# https://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.
"""
Module that implements unittests cases for AutoGlome Class.
"""
import unittest
from test import test_vectors
from cryptography.hazmat.primitives.asymmetric import x25519
import pyglome
class AutoGlomeTestVector:
"""Class that encapsulate needed components for testing AutoGlome Class."""
def __init__(self, test_vector, min_peer_tag_len, skippable_range):
self.data = test_vector
self.skippable_range = skippable_range
peer_key = x25519.X25519PublicKey.from_public_bytes(self.data.kb)
my_key = x25519.X25519PrivateKey.from_private_bytes(self.data.kap)
self.sender_glome = pyglome.AutoGlome(peer_key,
my_key,
min_peer_tag_len=min_peer_tag_len,
skippable_range=skippable_range)
peer_key = x25519.X25519PublicKey.from_public_bytes(self.data.ka)
my_key = x25519.X25519PrivateKey.from_private_bytes(self.data.kbp)
self.receiver_glome = pyglome.AutoGlome(
peer_key,
my_key,
min_peer_tag_len=min_peer_tag_len,
skippable_range=skippable_range)
class AutoGlomeTestBase:
"""Test keys constructions, tag generation and tag checking for AutoGlome."""
def __init__(self):
self.test_vector = None
def test_check_counters_raise_exceptions_when_incorrect(self):
test_vector = self.test_vector
with self.assertRaises(ValueError):
test_vector.sender_glome.sending_counter = -1
with self.assertRaises(ValueError):
test_vector.receiver_glome.sending_counter = 256
with self.assertRaises(ValueError):
test_vector.sender_glome.receiving_counter = 280
with self.assertRaises(ValueError):
test_vector.receiver_glome.receiving_counter = 280
def test_check_counters_dont_raise_exceptions_when_correct(self):
test_vector = self.test_vector
try:
test_vector.sender_glome.sending_counter = 0
test_vector.receiver_glome.sending_counter = 23
test_vector.sender_glome.receiving_counter = 123
test_vector.receiver_glome.receiving_counter = 255
except ValueError:
self.fail('properties raised ValueError unexpectedly!')
def test_check_counters_are_correctly_set(self):
test_vector = self.test_vector
test_vector.sender_glome.sending_counter = 0
self.assertEqual(test_vector.sender_glome.sending_counter, 0)
test_vector.receiver_glome.sending_counter = 23
self.assertEqual(test_vector.receiver_glome.sending_counter, 23)
test_vector.sender_glome.receiving_counter = 123
self.assertEqual(test_vector.sender_glome.receiving_counter, 123)
test_vector.receiver_glome.receiving_counter = 255
self.assertEqual(test_vector.receiver_glome.receiving_counter, 255)
def test_tag(self):
test_vector = self.test_vector
test_vector.sender_glome.sending_counter = test_vector.data.counter
self.assertEqual(test_vector.sender_glome.tag(test_vector.data.msg),
test_vector.data.tag)
def test_skippable_range(self):
test_vector = self.test_vector
try:
test_vector.receiver_glome.receiving_counter = (
test_vector.data.counter - test_vector.skippable_range) % 256
test_vector.receiver_glome.check(test_vector.data.tag,
msg=test_vector.data.msg)
self.assertEqual((test_vector.data.counter + 1) % 256,
test_vector.receiver_glome.receiving_counter)
except pyglome.IncorrectTagError:
self.fail('check() raised IncorrectTagError unexpectedly!')
class AutoGlomeTest1(unittest.TestCase, AutoGlomeTestBase):
"""Autoglome test using test vector #1 from the protocol documentation."""
def __init__(self, *args, **kwargs):
super(__class__, self).__init__(*args, **kwargs)
self.test_vector = AutoGlomeTestVector(test_vectors.TEST1,
min_peer_tag_len=32,
skippable_range=0)
class AutoTest2(unittest.TestCase, AutoGlomeTestBase):
"""Autoglome test using test vector #2 from the protocol documentation."""
def __init__(self, *args, **kwargs):
super(__class__, self).__init__(*args, **kwargs)
self.test_vector = AutoGlomeTestVector(test_vectors.TEST2,
min_peer_tag_len=8,
skippable_range=10)
if __name__ == '__main__':
unittest.main()
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