Bitcoin Forum

// ==UserScript==
// @name        New Captcha CRACKER
// @author      TryNinja The H4CK3R1337 8)
// @match       https://bitcointalk.org/index.php?action=post*
// @grant       none
// @version     1.1
// ==/UserScript==
(() => {
	function solve(key) {
		function S(a, c) {
			return ((a << c) | (a >>> (32 - c))) & 4294967295;
		}

		function sha1(key) {
			var e = new ArrayBuffer(64),
				d = new DataView(e);
			e = new Uint8Array(e);

			e.set(key);
			e[key.length] = 128;

			d.setUint32(60, 8 * key.length);
			var schedule = Array(80);

			for (var i = 0; i < 80; i++) {
				if (i < 16) {
					schedule[i] = d.getUint32(4 * i);
				} else {
					schedule[i] = S(
						schedule[i - 3] ^
						schedule[i - 8] ^
						schedule[i - 14] ^
						schedule[i - 16],
						1
					);
				}
			}

			var roundFunctions = [
				function(t, v, w) {
					return (t & v) | (~t & w);
				},
				function(t, v, w) {
					return t ^ v ^ w;
				},
				function(t, v, w) {
					return (t & v) | (t & w) | (v & w);
				},
				function(t, v, w) {
					return t ^ v ^ w;
				},
			];
			var hash = [1732584193, 4023233417, 2562383102, 271733878, 3285377520];

			for (var i = 0; i < 80; i++) {
				var f = Math.floor(i / 20);
				var temp =
					S(hash[0], 5) +
					roundFunctions[f](hash[1], hash[2], hash[3]) +
					hash[4] +
					schedule[i] + [1518500249, 1859775393, 2400959708, 3395469782][f];
				hash[4] = hash[3];
				hash[3] = hash[2];
				hash[2] = S(hash[1], 30);
				hash[1] = hash[0];
				hash[0] = temp & 4294967295;
			}

			d.setUint32(0, (1732584193 + hash[0]) & 4294967295);
			d.setUint32(4, (4023233417 + hash[1]) & 4294967295);
			d.setUint32(8, (2562383102 + hash[2]) & 4294967295);
			d.setUint32(12, (271733878 + hash[3]) & 4294967295);
			d.setUint32(16, (3285377520 + hash[4]) & 4294967295);

			return e.slice(0, 20);
		}

		let d = [114, 117, 106, 121, 119, 106, 115, 100, 107, 101, 114, 100];
		for (f = 0; 8 > f; f++) d[12 + f] = key.charCodeAt(2 + f);
		let hash = sha1(d);
		let answer = "";
		for (f = 0; 20 > f; f++) {
			const k = hash[f].toString(16).padStart(2, "0");
			answer += k;
		}

		return answer;
	}

	const input = document.querySelector("input[name=h4cfb47325c1907ed]");
	const captchaAnswer = solve(input.value);
	input.value = captchaAnswer;
	input.setAttribute("value", captchaAnswer);
	document.querySelector("canvas").outerHTML = '<p style="font-weight: bold; font-size: 24px">Captcha cracked by TryNinja The H4CK3R1337!</p>';
})();