Coverage for /pythoncovmergedfiles/medio/medio/src/fuzz_dsa.py: 52%

1###### Coverage stub 

2import atexit 

3import coverage 

4cov = coverage.coverage(data_file='.coverage', cover_pylib=True) 

5cov.start() 

6# Register an exist handler that will print coverage 

7def exit_handler(): 

8 cov.stop() 

9 cov.save() 

10atexit.register(exit_handler) 

11####### End of coverage stub 

12#!/usr/bin/python3 

13 

14# Copyright 2022 Google LLC 

15# 

16# Licensed under the Apache License, Version 2.0 (the "License"); 

17# you may not use this file except in compliance with the License. 

18# You may obtain a copy of the License at 

19# 

20# http://www.apache.org/licenses/LICENSE-2.0 

21# 

22# Unless required by applicable law or agreed to in writing, software 

23# distributed under the License is distributed on an "AS IS" BASIS, 

24# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 

25# See the License for the specific language governing permissions and 

26# limitations under the License. 

27import sys 

28import atheris 

29with atheris.instrument_imports(): 

30 from cryptography.hazmat.primitives import hashes 

31 from cryptography.hazmat.primitives.asymmetric import dsa, utils 

32 

33def TestInput(input_bytes): 

34 fdp = atheris.FuzzedDataProvider(input_bytes) 

35 

36 private_key = dsa.generate_private_key(key_size=1024) 

37 public_key = private_key.public_key() 

38 

39 data = fdp.ConsumeBytes(20) 

40 more_data = fdp.ConsumeBytes(20) 

41 

42 hasher = hashes.Hash(hashes.SHA256()) 

43 hasher.update(data) 

44 hasher.update(more_data) 

45 digest = hasher.finalize() 

46 

47 sig1 = private_key.sign(data,hashes.SHA256()) 

48 sig2 = private_key.sign(digest,utils.Prehashed(hashes.SHA256())) 

49 

50 public_key.verify(sig1,data,hashes.SHA256()) 

51 public_key.verify(sig2,digest,utils.Prehashed(hashes.SHA256())) 

52 

53def main(): 

54 atheris.Setup(sys.argv, TestInput, enable_python_coverage=False) 

55 atheris.instrument_all() 

56 atheris.Fuzz() 

57 

58if __name__ == "__main__": 

59 main()