security-and-privacy/CanvasBlocker
security-and-privacy/CanvasBlocker
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Added image-data hash.

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This commit is contained in:
kkapsner 2018-07-12 00:42:34 +02:00
parent 96118e5690
commit 88b5e7668f
1 changed files with 20 additions and 9 deletions
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29
test/test.js
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@ -2,19 +2,28 @@
(function(){
"use strict";
function show(container, {url, isPointInPath}){
function hashToString(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 show(container, {url, imageData, isPointInPath}){
var display = container.querySelector(".display");
display.src = url;
display.title = url;
var buffer = new TextEncoder("utf-8").encode(url);
crypto.subtle.digest("SHA-256", buffer).then(function(hash){
var chunks = [];
(new Uint32Array(hash)).forEach(function(num){
chunks.push(num.toString(16));
});
container.querySelector(".hash").textContent = chunks.map(function(chunk){
return "0".repeat(8 - chunk.length) + chunk;
}).join("");
Promise.all([
crypto.subtle.digest("SHA-256", buffer),
crypto.subtle.digest("SHA-256", imageData.data)
]).then(function(hashes){
container.querySelector(".hash").textContent =
hashToString(hashes[0]) + " / " +
hashToString(hashes[1]);
});
container.querySelector(".isPointInPath").textContent = isPointInPath;
}
@ -86,6 +95,7 @@ function topTest(){
var ctx = draw(canvas);
return {
url: canvas.toDataURL(),
imageData: ctx.getImageData(0, 0, canvas.width, canvas.height),
isPointInPath: getIsPointInPath(ctx)
};
}
@ -110,6 +120,7 @@ function iframeTest(iframe){
return {
url: iframe_canvas.toDataURL(),
imageData: iframe_ctx.getImageData(0, 0, iframe_canvas.width, iframe_canvas.height),
isPointInPath: getIsPointInPath(iframe_ctx)
};
}