Coverage for /pythoncovmergedfiles/medio/medio/src/fuzz_sym.py: 47%

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 base64 

29import atheris 

30with atheris.instrument_imports(): 

31 from cryptography.fernet import Fernet 

32 from cryptography.hazmat.primitives import hashes 

33 from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC 

34 

35def TestInput(input_bytes): 

36 fdp = atheris.FuzzedDataProvider(input_bytes) 

37 plaintext = fdp.ConsumeBytes(32) 

38 

39 key = Fernet(Fernet.generate_key()) 

40 token = key.encrypt(plaintext) 

41 text = key.decrypt(token) 

42 assert (plaintext == text), "Encryption/Decrption error!" 

43 

44 password = fdp.ConsumeBytes(8) 

45 salt = fdp.ConsumeBytes(16) 

46 kdf = PBKDF2HMAC( 

47 algorithm=hashes.SHA256(), 

48 length=32, 

49 salt=salt, 

50 iterations=1, 

51 ) 

52 key = Fernet(base64.urlsafe_b64encode(kdf.derive(password))) 

53 token = key.encrypt(plaintext) 

54 text = key.decrypt(token) 

55 assert (plaintext == text), "Encryption/Decrption error!" 

56 

57def main(): 

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

59 atheris.Fuzz() 

60 

61if __name__ == "__main__": 

62 main()