Requirements: pip3 install --user pycrypto

File payload1.py and payload2.py are two malicious program. It is easy to recognize if a script contains one of these two payloads and identify the payload version: they use variables names that are easy to identify. File malware.py is a malware that is able to inject a payload to a victim file.

Implement the function check of the file antivirus.py. The function should return 1 if payload1.py has been injected into filename by malware.py; 2 if payload2.py has been injected into filename by malware.py; None otherwise. Note that no matter the payload is encrypted or not, antivirus.py should be able to detect it.

To test your solution execute ./test.py.