Coverage for /pythoncovmergedfiles/medio/medio/src/fuzz_encryption.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# Copyright 2023 Google LLC 

14# 

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

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

17# You may obtain a copy of the License at 

18# 

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

20# 

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

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

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

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

25# limitations under the License. 

26 

27import atheris 

28import sys 

29from io import BytesIO 

30 

31with atheris.instrument_imports(): 

32 from pypdf import PdfWriter, PdfReader 

33 

34 

35@atheris.instrument_func 

36def TestInputOne(data): 

37 fdp = atheris.FuzzedDataProvider(data) 

38 

39 try: 

40 dummy = BytesIO() 

41 writer = PdfWriter() 

42 

43 # Construct PDF 

44 writer.add_metadata({ 

45 f"/X{fdp.ConsumeUnicodeNoSurrogates(100)}": fdp.ConsumeUnicodeNoSurrogates(100) 

46 }) 

47 rect = (10, 20, 30, 40) 

48 # Encrypt 

49 key = fdp.ConsumeUnicodeNoSurrogates(sys.maxsize) 

50 writer.encrypt(key, algorithm="AES-256") 

51 writer.write(dummy) 

52 

53 # Read Dummy PDF 

54 reader = PdfReader(dummy) 

55 

56 if not reader.is_encrypted: 

57 raise Exception("Encryption error. Failed to encrypt stream") 

58 

59 # Decrypt 

60 reader.decrypt(key) 

61 

62 if reader.stream == dummy: 

63 raise Exception("Decryption error. Original stream != Decrypted stream") 

64 

65 except Exception: 

66 return 

67 

68 

69if __name__ == '__main__': 

70 atheris.Setup(sys.argv, TestInputOne) 

71 atheris.Fuzz()