On Tue, Dec 8, 2015 at 9:55 PM, Dustin Lee <qhfgva@gmail.com> wrote:
Prelude> :m +Crypto

A glance at the main listing here:

https://hackage.haskell.org/package/Crypto

reveals that the module names are like

Data.Digest.MD5
Codec.Encryption.AES

So ":m +Data.Digest.MD5" should work.

-- Kim-Ee