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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 Glome Class.
"""
import unittest
from cryptography.hazmat.primitives.asymmetric import x25519
import pyglome
from test import test_vectors
class GlomeTestVector:
"""Class that encapsulates needed components for testing Glome Class."""
def __init__(self, test_vector, truncated_length):
self.data = test_vector
peer_key = x25519.X25519PublicKey.from_public_bytes(self.data.kb)
my_key = x25519.X25519PrivateKey.from_private_bytes(self.data.kap)
self.sender_glomes = pyglome.Glome(peer_key, my_key)
peer_key = x25519.X25519PublicKey.from_public_bytes(self.data.ka)
my_key = x25519.X25519PrivateKey.from_private_bytes(self.data.kbp)
self.receiver_glomes = pyglome.Glome(peer_key, my_key)
self.truncated_tag_length = truncated_length
peer_key = x25519.X25519PublicKey.from_public_bytes(self.data.kb)
my_key = x25519.X25519PrivateKey.from_private_bytes(self.data.kap)
self.truncated_sender_glomes = pyglome.Glome(peer_key, my_key,
self.truncated_tag_length)
peer_key = x25519.X25519PublicKey.from_public_bytes(self.data.ka)
my_key = x25519.X25519PrivateKey.from_private_bytes(self.data.kbp)
self.truncated_receiver_glomes = pyglome.Glome(
peer_key, my_key, self.truncated_tag_length)
class GlomeTestBase:
"""Test Class for Glome Class.
Implements the logic for tests tag and key generation, as well as tag
checking.
"""
def __init__(self, *args, **kwargs):
super(__class__, self).__init__(*args, **kwargs)
self.test_vector = None
def test_keys_generation(self):
test_vector = self.test_vector
self.assertEqual(
test_vector.sender_glomes._send_key,
test_vector.data.sk + test_vector.data.kb + test_vector.data.ka)
self.assertEqual(
test_vector.sender_glomes._receive_key,
test_vector.data.sk + test_vector.data.ka + test_vector.data.kb)
self.assertEqual(
test_vector.receiver_glomes._send_key,
test_vector.data.sk + test_vector.data.ka + test_vector.data.kb)
self.assertEqual(
test_vector.receiver_glomes._receive_key,
test_vector.data.sk + test_vector.data.kb + test_vector.data.ka)
def test_tag_generation(self):
test_vector = self.test_vector
self.assertEqual(
test_vector.sender_glomes.tag(test_vector.data.msg,
test_vector.data.counter),
test_vector.data.tag)
def test_check_raises_exception_when_incorrect(self):
test_vector = self.test_vector
with self.assertRaises(pyglome.IncorrectTagError):
test_vector.sender_glomes.check(tag=bytes([123]),
msg=test_vector.data.msg,
counter=0)
with self.assertRaises(pyglome.IncorrectTagError):
test_vector.receiver_glomes.check(tag=bytes([234]),
msg=test_vector.data.msg,
counter=0)
with self.assertRaises(pyglome.IncorrectTagError):
test_vector.sender_glomes.check(
tag=test_vector.data.tag[:test_vector.truncated_tag_length],
msg=test_vector.data.msg,
counter=0)
with self.assertRaises(pyglome.IncorrectTagError):
test_vector.truncated_receiver_glomes.check(
tag=test_vector.data.tag[:test_vector.truncated_tag_length] +
test_vector.data.tag[:test_vector.truncated_tag_length],
msg=test_vector.data.msg,
counter=test_vector.data.counter)
with self.assertRaises(pyglome.IncorrectTagError):
test_vector.truncated_receiver_glomes.check(
tag=test_vector.data.tag[:test_vector.truncated_tag_length] +
test_vector.data.tag[test_vector.truncated_tag_length::-1],
msg=test_vector.data.msg,
counter=test_vector.data.counter)
def test_check_doesnt_raise_exception_when_correct(self):
test_vector = self.test_vector
try:
test_vector.receiver_glomes.check(test_vector.data.tag,
msg=test_vector.data.msg,
counter=test_vector.data.counter)
test_vector.truncated_receiver_glomes.check(
test_vector.data.tag[:test_vector.truncated_tag_length],
msg=test_vector.data.msg,
counter=test_vector.data.counter)
test_vector.truncated_receiver_glomes.check(
test_vector.data.tag[:test_vector.truncated_tag_length + 2],
msg=test_vector.data.msg,
counter=test_vector.data.counter)
except pyglome.IncorrectTagError:
self.fail('check() raised IncorrectTagError unexpectedly!')
class GlomeTest1(unittest.TestCase, GlomeTestBase):
"""TestCase based on test vector #1 from protocol documentation"""
def __init__(self, *args, **kwargs):
super(__class__, self).__init__(*args, **kwargs)
self.test_vector = GlomeTestVector(test_vectors.TEST1, 8)
class GlomeTest2(unittest.TestCase, GlomeTestBase):
"""TestCase based on test vector #1 from protocol documentation"""
def __init__(self, *args, **kwargs):
super(__class__, self).__init__(*args, **kwargs)
self.test_vector = GlomeTestVector(test_vectors.TEST2, 8)
if __name__ == '__main__':
unittest.main()
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