Hashed port number collisions

porthash.js

var crypto = require('crypto');

function hash(s) {
	return (parseInt(crypto.createHash('sha1').update(s || '').digest('hex'), 16) % 50000) + 10000;
}

var nums = {};
var lookup = {};

for (var i = 1; i <= 100; i++) {
	var r = parseInt(Math.random() * 1e4);
	if (nums[r]) {
		i--;
		continue;
	}

	var s = 'com.testapp' + r;
	var port = hash(s.split().reverse().join());

	if (lookup[port]) {
		console.log(s + '\t= ' + port + ' COLLISION! ' + lookup[port]);
	} else {
		console.log(s + '\t= ' + port);
		lookup[port] = s;
	}
}