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https://github.com/sigmasternchen/axowall
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demo & proof of concept
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commit
44f96fffe9
2 changed files with 159 additions and 0 deletions
106
index.html
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106
index.html
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<!DOCTYPE html>
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<html>
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<head>
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<script src="main.js"></script>
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<style>
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.captcha {
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width: 300px;
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height: 70px;
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padding: 20px;
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border: 1px solid grey;
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box-sizing: border-box;
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font-size: 20px;
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font-family: sans-serif;
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}
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.captcha span {
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position: relative;
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top: -9px;
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}
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.captcha .checkbox {
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position: relative;
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margin: 0;
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margin-right: 20px;
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height: 30px;
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width: 30px;
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display: inline-block;
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background-color: white;
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cursor: pointer;
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border: 1px solid black;
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border-radius: 3px;
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}
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.captcha .checkbox:hover {
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background-color: lightgrey;
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}
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.captcha .checkbox.checked {
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background-color: #2196F3;
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}
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.captcha .checkbox.checked::before {
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position: absolute;
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display: block;
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content: "";
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width: 7px;
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height: 15px;
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top: 2px;
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left: 9px;
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border: white solid;
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border-width: 0 5px 5px 0;
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transform: rotate(45deg);
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}
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.captcha .checkbox.loading {
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}
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.captcha .checkbox.loading::before {
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content: "";
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display: block;
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position: absolute;
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top: 2.5px;
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left: 2.5px;
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width: 17px;
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height: 17px;
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border: 4px solid;
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border-radius: 50%;
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border-color: black transparent black transparent;
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animation: captchaLoading infinite 1s;
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}
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@keyframes captchaLoading {
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to{
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transform: rotate(.5turn)
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}
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}
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</style>
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<script>
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window.addEventListener("load", () => {
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[...document.querySelectorAll(".captcha .checkbox")].forEach(c => c.addEventListener("click", async function() {
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const result = document.getElementById("result");
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result.innerText = "Calculating...";
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this.classList.add("loading");
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const challenge = makeSuffix(Math.floor(Math.random() * Number.MAX_SAFE_INTEGER)) + ":" + makeSuffix(new Date().valueOf()) + ":";
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const response = await findHashWithPrefix(15, challenge);
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result.innerText = "Challenge Response: " + response;
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this.classList.remove("loading");
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this.classList.add("checked");
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}));
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});
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</script>
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</head>
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<body>
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<div class="captcha">
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<div class="checkbox"></div>
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<span>I am not a robot.</span>
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</div>
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<div id="result"></div>
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</body>
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</html>
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53
main.js
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53
main.js
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const hexCharset = "0123456789abcdef".split("");
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const suffixCharset = [
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"0123456789",
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"abcdefghijklmnopqrstuvwxyz",
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ",
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"+-",
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].flatMap(set => set.split(""));
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const suffixCharsetBits = 6;
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const sha256 = "SHA-256";
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Uint8Array.prototype.toHex = function() {
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return [...this].map(c => hexCharset[c >> 4] + hexCharset[c & 15]).join("");
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};
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Uint8Array.prototype.hasPrefix = function(array, bits) {
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for(let i = 0; i < array.length && i * 8 < bits; i++) {
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const bitsForByte = Math.min(8, bits - i * 8);
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const bitMask = ((1 << bitsForByte) - 1) << (8 - bitsForByte);
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if ((this[i] & bitMask) != (array[i] & bitMask)) {
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return false;
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}
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}
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return true;
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};
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async function digest(algo, input) {
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return new Uint8Array(await crypto.subtle.digest(algo, new TextEncoder().encode(input)));
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}
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function makeSuffix(index) {
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let result = "";
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while (index > 0) {
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result += suffixCharset[index & ((1 << suffixCharsetBits) - 1)];
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index >>= suffixCharsetBits;
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}
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return result;
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}
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async function findHashWithPrefix(hashPrefixBits, inputPrefix) {
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const hashPrefix = new Uint8Array(Array(Math.ceil(hashPrefixBits / 8)).map(c => 0));
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let iteration = 0;
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do {
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var message = inputPrefix + makeSuffix(iteration++)
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var hash = await digest(sha256, message);
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} while (!hash.hasPrefix(hashPrefix, hashPrefixBits));
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return message;
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}
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