Discussion on answer by Majestio: Язык C, контроль целостности файла

Imported from a comment discussion on https://ru.stackoverflow.com/questions/850068/%d0%af%d0%b7%d1%8b%d0%ba-c-%d0%ba%d0%be%d0%bd%d1%82%d1%80%d0%be%d0%bb%d1%8c-%d1%86%d0%b5%d0%bb%d0%be%d1%81%d1%82%d0%bd%d0%be%d1%81%d1%82%d0%b8-%d1%84%d0%b0%d0%b9%d0%bb%d0%b0/850072#850072