I'm assuming that the presence of crypto isn't the only thing that's part of your evaluation of game engines. My suggestion would be to start making a list of features you require (including crypto), and start whittling down the list of engines.
Additionally, what you want to do with it is a factor as well. If you just want to encrypt a local file, that's going to be pretty easy perhaps. If you want to encrypt data transmission between your client and a server, that's getting more complex. But at the same time client/server encryption is pretty common, including just using HTTPS.