If you're wanting to build an app that has cryptographic capabilities, you might run into some trouble if you're expecting to be able to do it in JavaScript wit

If you're wanting to build an app that has cryptographic capabilities, you might run into some trouble if you're expecting to be able to do it in JavaScript without touching any ObjC/Java (an expectation that I don't believe to be highly unreasonable) React Natives's JavaScript runtime doesn't support WebCrypto. People have resorted to browserifying Node's crypto module (and the rest of Node's built-in modules, as a result) which gives you everything besides a RNG (a RNG cannot be browserified for obvious reasons). I guess what I'm saying is: I sure hope you aren't trying to do anything too exotic with React Native without first getting ankle-deep in some native code.