Has the Crypto module been missing from calibre's OSX Python environment for a while now (or has it always been missing from that platform)? I just noticed it when I was testing some plugins that were failing on the OSX platform only (current versions of calibre). I was almost positive it was there at some point--and indeed it seems to be back in the Qt5 OSX betas. Just trying to figure out a plan to cover a potential gap in a plugin's ability to use those particular Ciphers on that platform alone. If it's just a handful of recent releases where it's missing, I may choose to do nothing.
