might be of interest in light of possible AES breakage: i have a small project that encrypts/decrypts the whole message with RSA (of course the message is also signed before encryption and result is verified on decryption);
runs on as much cores as available; also for this it goes into some length to avoid multithreading locks in openssl (where possible).
http://mosermichael.github.io/cstuff/all/projects/2014/02/24...