113 lines
2.5 KiB
JavaScript
113 lines
2.5 KiB
JavaScript
var log = function(){
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"use strict";
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return function log(...str){
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if (str[str.length - 1] === "match"){
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str.unshift("color: green");
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str.unshift("%cOK");
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}
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else if (str[str.length - 1].substr(0, 9) === "missmatch"){
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str.unshift("color: red");
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str.unshift("%cX");
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}
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console.log(...str);
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};
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}();
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function draw(canvas){
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"use strict";
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canvas.setAttribute("width", 220);
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canvas.setAttribute("height", 30);
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var fp_text = "BrowserLeaks,com <canvas> 10";
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var ctx = canvas.getContext("2d");
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ctx.textBaseline = "top";
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ctx.font = "14px 'Arial'";
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ctx.textBaseline = "alphabetic";
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ctx.fillStyle = "#f60";
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ctx.fillRect(125, 1, 62, 20);
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ctx.fillStyle = "#069";
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ctx.fillText(fp_text, 2, 15);
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ctx.fillStyle = "rgba(102, 204, 0, 07)";
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ctx.fillText(fp_text, 4, 17);
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return ctx;
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}
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function test(window){
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"use strict";
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// create window canvas
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var canvas = document.createElement("canvas");
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// draw image in window canvas
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draw(canvas);
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return window.HTMLCanvasElement.prototype.toDataURL.call(canvas);
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}
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function hash(string){
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"use strict";
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var buffer = new TextEncoder("utf-8").encode(string);
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return crypto.subtle.digest("SHA-256", buffer).then(function(hash){
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var chunks = [];
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(new Uint32Array(hash)).forEach(function(num){
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chunks.push(num.toString(16));
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});
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return chunks.map(function(chunk){
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return "0".repeat(8 - chunk.length) + chunk;
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}).join("");
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});
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}
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function compare(string1, string2, alwaysOutputHashes){
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"use strict";
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function outputHashes(message){
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return Promise.all([
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hash(string1),
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hash(string2)
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]).then(function(hashes){
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console.log(message, ...hashes);
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return;
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});
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}
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if (string1 === string2){
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if (alwaysOutputHashes){
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outputHashes("Matching hashes:");
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}
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return "match";
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}
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else {
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outputHashes("Hashes that differ:");
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if (string1.length === string2.length){
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let i;
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for (i = 0; i < string1.length; i += 1){
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if (string1.charAt(i) !== string2.charAt(i)){
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break;
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}
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}
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return "missmatch (first at " + i + ")";
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}
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else {
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let i;
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for (i = 0; i < Math.min(string1.length, string2.length); i += 1){
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if (string1.charAt(i) !== string2.charAt(i)){
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break;
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}
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}
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return "missmatch (different lengths, first at " + i + ")";
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}
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}
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}
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var reference = test(window);
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hash(reference).then(function(hash){
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"use strict";
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log("reference hash:", hash);
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return;
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}).catch(function(error){
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"use strict";
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log("%cX", "color: red", "Unable to compute reference hash:", error);
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}); |