CommonJS format

gistfile1.js

var supplant = require('utils/supplant');

function rhex(n) {
    var s = '', j = 0;
	for (; j < 4; j++) {
		s += hex_chr[(n >> (j * 8 + 4)) & 0x0F] + hex_chr[(n >> (j * 8)) & 0x0F];
	}
	return s;
}

function hex(x) {
	for (var i = 0; i < x.length; i++) {
		x[i] = rhex(x[i]);
	}
	return x.join('');
}

module.exports = function () {
	// Build an instance of the md5 object with encrypt() features only...
	return {
		encrypt: function (s) {
			var results = hex(s);
			console.log(supplant('md5::encrypt({0}) = {1}', [ s, results]));

			return results;
		}
	};
};

But aren't the functions hex() and rhex() global; with this implementation ?

Nope, Browserify wraps the file's contents in an IIFE and only module.exports gets exposed.

Seems like they wouldn't be if this is loaded into a node-style context, right? That's the point of the "module.exports" object. All of this stays encapsulated, if I understand correctly.

If you just include this via a <script> tag, of course, then it would be global. But Browserify, as I understand it, basically uses node-style module loading to compile this before you include it, right?

Correct.

http://dontkry.com/posts/code/browserify-and-the-universal-module-definition.html
http://esa-matti.suuronen.org/blog/2013/03/22/journey-from-requirejs-to-browserify/
http://killdream.github.io/2013/06/06/node-modules-to-rule-them-all.html