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Advisory: secret size attack on cross-chain hash lock smart contracts

Dr. Mark B Lundeberg, 2018 Feb 15 bitcoincash:qqy9myvyt7qffgye5a2mn2vn8ry95qm6asy40ptgx2

This security advisory notes a vulnerability in the common construction of cross-chain smart contracts (contracts between distinct cryptocurrencies) through hash locking. I focus on the primary use case in [atomic

	const templates = Object.create(null, {
	load: {
	value: async function(fileName) {
	const url = new URL(fileName,
	document.currentScript && document.currentScript.src \|\| location.href)
	if (url in this) return this[url]
	// fetch and parse template as string
	let template = await fetch(url)
	template = await template.text()
	template = new DOMParser().parseFromString(template, 'text/html')

	// work in progress
	// you need a bittrex API key and secret with read account option enabled

	// I assume that all the keys are in the "keys" spreadsheet. The key is in cell B5 and the secret in cell C5
	var sheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("keys");
	var key = sheet.getRange("B5").getValue()
	var secret = sheet.getRange("C5").getValue();
	var baseUrl = 'https://bittrex.com/api/v1.1/';
	var nonce = Math.floor(new Date().getTime()/1000);

	<!DOCTYPE html>
	<html lang="en">
	<head>
	<title></title>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	</head>
	<body>
	<h2>Hello from outside the Shadow DOM!</h2>

	function promiseMap(inputValues, mapper) {
	const reducer = (acc$, inputValue) =>
	acc$.then(acc => mapper(inputValue).then(result => acc.push(result) && acc));
	return inputValues.reduce(reducer, Promise.resolve([]));
	}

	/* Example */

	const axios = require('axios');

	// Author: Renat Tuktarov ([email protected])

	const retry = function(fn, prev) {
	return new Promise((current, reject) => {
	const resolve = _ => (prev && prev()) \|\| current();

	fn(resolve, delay => {
	setTimeout(_ => {
	retry(fn, resolve);
	}, delay);

	/************************
	search.js
	************************/

	// an example of how to implement fuse.js with a web worker
	var searchWorker; // initialized in document ready function
	if(typeof(Worker) !== "undefined") {
	if(typeof(searchWorker) == "undefined") {
	searchWorker = new Worker('/scripts/searchWorker.js');
	}

	# Add this to your .bashrc
	# Use it like: you@console_>$ _get https://website.org/file.txt
	_get ()
	{
	IFS=/ read proto z host query <<< "$1"
	exec 3< /dev/tcp/$host/80
	{
	echo GET /$query HTTP/1.1
	echo connection: close
	echo host: $host

	const poll = ({ fn, validate, interval, maxAttempts }) => {
	console.log('Start poll...');
	let attempts = 0;

	const executePoll = async (resolve, reject) => {
	console.log('- poll');
	const result = await fn();
	attempts++;

	if (validate(result)) {