crash

//REQUIRES https://github.com/emn178/js-sha3
var hash = "0a6ae43a8a40074816f44cf23db029d3d4fc639dfb58925aa72b7ae03182c197";
var secret = "639fd110d205287b5711070b8936019a30c073e5701ff67073b6edd166e223e6";
var round_id = "435793";
var day_of_month = "21";
var crash_point = 1.09;
var instant_crash_percentage = 4;
var instant_crash_mode = 1;

var outcome = keccak512.create();
outcome.update(secret);
outcome.update(round_id);
outcome.update(day_of_month);

var outcome_hash = outcome.hex();

var calculateCrashPoint = function(outcome_hash) {
    var divisible = function divisible(hash, mod) {
    var val = 0;

    var o = hash.length % 4;
    for (var i = o > 0 ? o - 4 : 0; i < hash.length; i += 4) {
		val = ((val << 16) + parseInt(hash.substring(i, i + 4), 16)) %
		mod;
    }
	return val === 0;
	};

	var isInstantCrash = function (hash, percentage) {
		//we calculate a ticket and check if its less than the crash percentage
		var ticket = 100.0;
		var sub_hash = "";
		for (var i = 0; i < outcome_hash.length; ++i) {
			sub_hash += outcome_hash[i];
			if (sub_hash.length > 7)
			{
				var num = parseInt(sub_hash, 16);
				if ((num != NaN)) { ticket = (num % 1000001) / 10000.0;
				break;
				} sub_hash = "";
			}
		}
		return ticket < percentage ? true : false;
	};

	//we calculate if this round is instant crash with one of the following modes
	if ((instant_crash_mode === 0) && divisible(outcome_hash, 100.0 / instant_crash_percentage)) {
		return 0.0;
	}
	//new way of calculating instant crash so we can allow a lower percentage and more fairness
	else if ((instant_crash_mode === 1) && isInstantCrash(outcome_hash, instant_crash_percentage))
	{
		return 0.0;
	}
	// Use the most significant 52-bit from the hash to calculate the crash point
	var h = parseInt(outcome_hash.slice(0, 52 / 4), 16);
	var e = Math.pow(2, 52); return Math.floor((100 * e - h) / (e - h)) / 100.0;
};
	console.log("calculated outcome:" + calculateCrashPoint(outcome_hash));