Coverage for /pythoncovmergedfiles/medio/medio/src/fuzz_aead.py: 62%

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 import cryptography.hazmat.primitives.ciphers.aead as aead 

31 

32def TestInput(input_bytes): 

33 if len(input_bytes) < 12: 

34 return 

35 

36 fdp = atheris.FuzzedDataProvider(input_bytes) 

37 

38 choice = fdp.ConsumeIntInRange(1,4) 

39 

40 if choice == 1: 

41 cipher = aead.ChaCha20Poly1305(aead.ChaCha20Poly1305.generate_key()) 

42 if choice == 2: 

43 cipher = aead.AESGCM(aead.AESGCM.generate_key(bit_length=128)) 

44 if choice == 3: 

45 cipher = aead.AESOCB3(aead.AESOCB3.generate_key(bit_length=128)) 

46 if choice == 4: 

47 cipher = aead.AESCCM(aead.AESCCM.generate_key(bit_length=128)) 

48 

49 msg = fdp.ConsumeBytes(32) 

50 authentext = fdp.ConsumeBytes(32) 

51 nonce = fdp.ConsumeBytes(12) 

52 

53 if len(nonce) < 12: 

54 return 

55 

56 ciphertext = cipher.encrypt(nonce, msg, authentext) 

57 plaintext = cipher.decrypt(nonce, ciphertext, authentext) 

58 

59 assert (plaintext == msg), "Encryption/Decrption error!" 

60 

61def main(): 

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

63 atheris.instrument_all() 

64 atheris.Fuzz() 

65 

66if __name__ == "__main__": 

67 main()