var log = function(){ "use strict"; return function log(...str){ // eslint-disable-next-line no-console console.log(...str); }; }(); function draw(canvas){ "use strict"; canvas.setAttribute("width", 220); canvas.setAttribute("height", 30); var fp_text = "BrowserLeaks,com 10"; var ctx = canvas.getContext("2d"); ctx.textBaseline = "top"; ctx.font = "14px 'Arial'"; ctx.textBaseline = "alphabetic"; ctx.fillStyle = "#f60"; ctx.fillRect(125, 1, 62, 20); ctx.fillStyle = "#069"; ctx.fillText(fp_text, 2, 15); ctx.fillStyle = "rgba(102, 204, 0, 07)"; ctx.fillText(fp_text, 4, 17); return ctx; } function test(window){ "use strict"; // create window canvas var canvas = document.createElement("canvas"); // draw image in window canvas var ctx = draw(canvas); return window.HTMLCanvasElement.prototype.toDataURL.call(canvas); } function hash(string){ "use strict"; var buffer = new TextEncoder("utf-8").encode(string); return crypto.subtle.digest("SHA-256", buffer).then(function(hash){ var chunks = []; (new Uint32Array(hash)).forEach(function(num){ chunks.push(num.toString(16)); }); return chunks.map(function(chunk){ return "0".repeat(8 - chunk.length) + chunk; }).join(""); }); } function compare(string1, string2, alwaysOutputHashes){ "use strict"; function outputHashes(message){ Promise.all([ hash(string1), hash(string2) ]).then(function(hashes){ // eslint-disable-next-line no-console console.log(message, ...hashes); }); } if (string1 === string2){ if (alwaysOutputHashes){ outputHashes("Matching hashes:"); } return "match"; } else { outputHashes("Hashes that differ:"); if (string1.length === string2.length){ let i; for (i = 0; i < string1.length; i += 1){ if (string1.charAt(i) !== string2.charAt(i)){ break; } } return "missmatch (first at " + i + ")"; } else { let i; for (i = 0; i < Math.min(string1.length, string2.length); i += 1){ if (string1.charAt(i) !== string2.charAt(i)){ break; } } return "missmatch (different lengths, first at " + i + ")"; } } } var reference = test(window); hash(reference).then(function(hash){ "use strict"; log("reference hash:", hash); });