exactly. Don't be clever and try to do things like re-invent bcrypt or hmac or do things through obscurity. Use the libs. I've written many auth systems, it is

exactly. Don't be clever and try to do things like re-invent bcrypt or hmac or do things through obscurity. Use the libs. I've written many auth systems, it is not rocket surgery. It is one of those things where you need to do some reading and understand what is going on, but I'd argue you should do that for just about everything you are working on.