This whitepaper is a walk through on how to extract msgstore.db.crypt5 from WhatsApp on Android and using tools to break crypt5.
You can download it from the following link: https://packetstormsecurity.com/files/download/126017/Whatsapp.pdf
Source: https://packetstormsecurity.com/files/126017/WhatsApp-Database-Extraction.html