DigitalJack might claim to not be a programmer, but if s/he knows enough to ask "Why can't you just digest or hash the JS?", that's pretty programmery.

Besides, "Programming" is a large spectrum; I know jack-all about javascript but am comfortable building CRUD apps in C# and am in the intended audience of "don't build your own crypto because you're an idiot" blog posts. I consider myself a programmer (even though I have a lot to learn) and had the same question in my head as DigitalJack.