Can Wireshark crack wep/wpa keys

Hi guys, I have this one question, can Wireshark crack wep, wpa/wpa2 wireless keys like Commview for wifi collecting IV’s. Cause every tutorial I come across the Net for Wireshark is always about sniffing/collecting packets for website usernames and passwords. But for that I would have to be already contected, and wifi connection is what im looking for. Interesting program though, but does Wireshark crack keys, where can I go for tutorials and etc, Thanks