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# 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.
"""Python GLOME fuzz main.
This module that implement some easy fuzz testing for pyglome.
"""
import hypothesis
import unittest
from cryptography.hazmat.primitives.asymmetric import x25519
import pyglome
def _glome(private_bytes, public_bytes, msg, tag, counter, min_tag_len):
"""Calls basic utilities of glome class, accepts only documented exceptions.
The intention of this function is to be fuzzed over to find cases that throw
unexpected exceptions."""
try:
private_key = x25519.X25519PrivateKey.from_private_bytes(private_bytes)
peer_key = x25519.X25519PublicKey.from_public_bytes(public_bytes)
except (ValueError, pyglome.ExchangeError):
return
try:
tag_manager = pyglome.Glome(peer_key, private_key, min_tag_len)
except ValueError:
return
# Call to property method to test side effects
tag_manager.user_keys
tag_manager.peer_key
try:
tag_manager.tag(msg, counter)
except pyglome.TagGenerationError:
pass
try:
tag_manager.check(tag, msg, counter)
except (pyglome.IncorrectTagError, pyglome.TagCheckError):
pass
def _autoglome(private_bytes, public_bytes, msg, tag, counter, min_tag_len,
skippable_range):
"""Calls basic utilities of autoglome class, accepts only documented exceptions.
The intention of this function is to be fuzzed over to find cases that throw
unexpected exceptions."""
try:
private_key = x25519.X25519PrivateKey.from_private_bytes(private_bytes)
peer_key = x25519.X25519PublicKey.from_public_bytes(public_bytes)
except (ValueError, pyglome.ExchangeError):
return
try:
tag_manager = pyglome.AutoGlome(peer_key,
private_key,
min_peer_tag_len=min_tag_len,
skippable_range=skippable_range)
except ValueError:
return
# Call to property method to test side effects
tag_manager.user_keys
tag_manager.peer_key
tag_manager.sending_counter
tag_manager.receiving_counter
try:
tag_manager.sending_counter = counter
except ValueError:
pass
try:
tag_manager.receiving_counter = counter
except ValueError:
pass
try:
tag_manager.tag(msg)
except pyglome.TagGenerationError:
pass
try:
tag_manager.check(tag, msg)
except (pyglome.IncorrectTagError, pyglome.TagCheckError):
pass
@hypothesis.settings(max_examples=10**7)
@hypothesis.given(
hypothesis.strategies.binary(min_size=32, max_size=32), #private_bytes
hypothesis.strategies.binary(min_size=32, max_size=32), #public_bytes
hypothesis.strategies.binary(), #msg
hypothesis.strategies.binary(min_size=32, max_size=32), #tag
hypothesis.strategies.integers(), #counter
hypothesis.strategies.integers()) #min_tag_len
def glome_test(private_bytes, public_bytes, msg, tag, counter, min_tag_len):
"""Add hypothesis decorator to _glome function"""
_glome(private_bytes, public_bytes, msg, tag, counter, min_tag_len)
@hypothesis.settings(max_examples=10**7)
@hypothesis.given(
hypothesis.strategies.binary(min_size=32, max_size=32), #private_bytes
hypothesis.strategies.binary(min_size=32, max_size=32), #public_bytes
hypothesis.strategies.binary(), #msg
hypothesis.strategies.binary(min_size=32, max_size=32), #tag
hypothesis.strategies.integers(), #counter
hypothesis.strategies.integers(), #min_tag_len
hypothesis.strategies.integers()) #skippable
def autoglome_test(private_bytes, public_bytes, msg, tag, counter, min_tag_len,
skippable):
"""Add hypothesis decorator to _autoglome function"""
_autoglome(private_bytes, public_bytes, msg, tag, counter, min_tag_len,
skippable)
@hypothesis.settings(max_examples=10**5)
@hypothesis.given(
hypothesis.strategies.binary(), #private_bytes
hypothesis.strategies.binary(), #public_bytes
hypothesis.strategies.binary(), #msg
hypothesis.strategies.binary(min_size=32, max_size=32), #tag
hypothesis.strategies.integers(), #counter
hypothesis.strategies.integers()) #min_tag_len
def glome_unsized_keys_test(private_bytes, public_bytes, msg, tag, counter,
min_tag_len):
"""Add hypothesis decorator to _glome function"""
_glome(private_bytes, public_bytes, msg, tag, counter, min_tag_len)
@hypothesis.settings(max_examples=10**5)
@hypothesis.given(
hypothesis.strategies.binary(), #private_bytes
hypothesis.strategies.binary(), #public_bytes
hypothesis.strategies.binary(), #msg
hypothesis.strategies.binary(min_size=32, max_size=32), #tag
hypothesis.strategies.integers(), #counter
hypothesis.strategies.integers(), #min_tag_len
hypothesis.strategies.integers()) #skippable
def autoglome_unsized_keys_test(private_bytes, public_bytes, msg, tag, counter,
min_tag_len, skippable):
"""Add hypothesis decorator to _autoglome function"""
_autoglome(private_bytes, public_bytes, msg, tag, counter, min_tag_len,
skippable)
class GlomeTest1(unittest.TestCase):
"""Test Class that check one iteration of each function.
Uses sample input to test whether the fuzzing function raise unexpected
exceptions."""
def __init__(self, *args, **kwargs):
super(__class__, self).__init__(*args, **kwargs)
constant_one = b'\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11'
self.private_bytes = constant_one
self.public_bytes = constant_one
self.msg = b'\x11'
self.tag = constant_one
self.counter = 1
self.min_tag_len = 1
self.skippable = 1
def test_glome_fuzz(self):
"""Test glome fuzzing function with trivial example"""
try:
_glome(self.private_bytes, self.public_bytes, self.msg, self.tag,
self.counter, self.min_tag_len)
except:
self.fail('Unexpected exception was raised.')
def test_autoglome_fuzz(self):
"""Test autoglome fuzzing function with trivial example"""
try:
_autoglome(self.private_bytes, self.public_bytes, self.msg,
self.tag, self.counter, self.min_tag_len, self.skippable)
except:
self.fail('Unexpected exception was raised.')
if __name__ == "__main__":
glome_test()
autoglome_test()
glome_unsized_keys_test()
autoglome_unsized_keys_test()
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