[doggodaddo78]

IIRC, aren't there a bazillion gotchas and practical problems implementing DH where it's definitely something one shouldn't roll their own?

[boris1]

I didn't roll my own. I'm using built-in browser functionality, available under crypto.subtle object of the browser. You can review the code in my WebUtil library on Github @borisreitman. It's just a light wrapper on top of browser's functionality.