Hiyall :) I've just had the exact same problem of downloading the SUNWcry packages. I'm fortunate enought to have a support contract with sun through my company! So i called up tech support. And it turns out that if you create an account at sunsolve.sun.com you can get it.
Download -> See All >> -> Cryptography & Encryption. Here you should choose the "Solaris 10 Encryption Kit" ! Thats the name of the three package iso containing the SUNWcry* packages. I burned the iso to cd and installed the 3 packages from there. After that i've had no problems at all getting a dhcp ip on my wpi0 interface on a WPA protected wifi. Thought i should clarify :) Let me know if you have requests / questions ;) This message posted from opensolaris.org
