Encryption Message (Arduino <==> SIM5320A <==> Webserver)

I've seen a couple of attempts of encryption implementations on Arduino? Does anybody have one that works well between that library on the Arduino and the Webserver? Tried AES from somebody and even the creator admitted isn't a full implementation which doesn't help me

For Arduino there exist complete, verified implementations of DES, AES and a dozen or two other encryption methods.

One collection is here.