security-and-privacy/CanvasBlocker
security-and-privacy/CanvasBlocker
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Hardened detection test.

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kkapsner 2017-12-09 20:19:54 +01:00
parent d787b84b13
commit e128cba84a
1 changed files with 13 additions and 5 deletions
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18
test/detectionTest.js
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@ -135,13 +135,21 @@ function testKnownPixelValue(size, log){
canvas.height = size; canvas.height = size;
canvas.width = size; canvas.width = size;
var context = canvas.getContext("2d"); var context = canvas.getContext("2d");
context.fillStyle = "rgba(0, 127, 255, 1)"; var imageData = new ImageData(canvas.width, canvas.height);
var pixelValues = [0, 127, 255, 255]; var pixelValues = imageData.data;
context.fillRect(0, 0, canvas.width, canvas.height); for (let i = 0; i < imageData.data.length; i += 1){
if (i % 4 !== 3){
pixelValues[i] = Math.floor(256 * Math.random());
}
else {
pixelValues[i] = 255;
}
}
context.putImageData(imageData, 0, 0);
var p = context.getImageData(0, 0, canvas.width, canvas.height).data; var p = context.getImageData(0, 0, canvas.width, canvas.height).data;
for (var i = 0; i < p.length; i += 1){ for (var i = 0; i < p.length; i += 1){
if (p[i] !== pixelValues[i%4]){ if (p[i] !== pixelValues[i]){
log("wrong value", p[i], "at", i, "expected", pixelValues[i%4]); log("wrong value", p[i], "at", i, "expected", pixelValues[i]);
return true; return true;
} }
} }