I do not know if new module(s) in Phobos require DIP or not. I always thought DIPs are for language changes, not for library changes...

Anyway, I would like to request to add a new package to Phobos called std.crypto.cyphers and add the aes module there with implementations of AES-128, AES-192 and AES-256, with GCM variant too.

Yes, I am aware that we have more than 10 packages in dub repository that contain AES, but I believe Phobos should have own implementation of this standard cypher.