Jason is correct. It is not essential to use a pi.? Almost computer could likely do it.? But a Pi would make sense because of it's low cost.

Not sure if it is exactly the same javascript crypto libraries, but node.js does supply javascript crypto libraries,? You might want to look at

In that document, they say you can test if your version of Node can execute the crypto libraries be running this test:

let crypto;
try {
? crypto = require('crypto');
} catch (err) {
? console.log('crypto support is disabled!');
}

I just ran this an one of my Pi's running node.js and yes crypto support is available.

I suspect Crestron is using node.js in their new series 4 processor for CH5.? So it may even be possible to do this on a series 4 assuming Crestron gives you the ability to run node javascript files yourself.? Although that is probably not the case because it would give you the ability to bypass CH5 and make your own webserver.

Really, javascript is not that hard to learn.? I am not really a? programmer type and I was able to learn it within the last year.? And I am sure I am a lot older then any of you guys. It would be a good idea to learn JavaScript if you plan to do any HTML5 projects.? Javascript is the language of the web browser.? All node is is a program that runs javascript outside of a browser -- usually has the backend for a web server.? And node has excellent documentation.