That’s what I need and that’s what’s required in order to use the current GUI (the XFCE File Manager) with encrypted USBs. Without cryptsetup, an error regarding cryptsetup appears after entering the passphrase. A less technical user may assume the problem is with the passphrase rather than with a missing package.

http://forums.dds6qkxpwdeubwucdiaord2xgbbeyds25rbsgr73tbfpqpt4a6vjwsyd.onion/t/have-cryptsetup-installed-by-default-in-whonix/6684/5