1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
|
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<script src="webgl-support.js"></script>
</head>
<body>
<script>
async function digestMessage(message) {
const encoder = new TextEncoder();
const data = encoder.encode(message);
const hashBuffer = await crypto.subtle.digest('SHA-256', data);
const hashArray = Array.from(new Uint8Array(hashBuffer));
const hashHex = hashArray.map((b) => b.toString(16).padStart(2, '0')).join('');
return hashHex;
}
function fullHorizontalLinearGradientCanvasImageData() {
let canvas = document.createElement("canvas");
canvas.style = "border: black; border-style: dashed;";
canvas.width = 30;
canvas.height = 2;
document.body.appendChild(canvas);
let ctx = canvas.getContext("2d");
let gradient = ctx.createLinearGradient(1, 0, 29, 0);
gradient.addColorStop(0, "green");
gradient.addColorStop(1, "black");
ctx.fillStyle = gradient;
ctx.fillRect(1, 0, 29, 2);
return ctx.getImageData(0, 0, canvas.width, canvas.height);
}
function fullVerticalLinearGradientCanvasImageData() {
let canvas = document.createElement("canvas");
canvas.style = "border: black; border-style: dashed;";
canvas.width = 2;
canvas.height = 30;
document.body.appendChild(canvas);
let ctx = canvas.getContext("2d");
let gradient = ctx.createLinearGradient(0, 1, 0, 29);
gradient.addColorStop(0, "green");
gradient.addColorStop(1, "black");
ctx.fillStyle = gradient;
ctx.fillRect(0, 1, 2, 29);
return ctx.getImageData(0, 0, canvas.width, canvas.height);
}
function fullRadialGradientCanvasImageData() {
let canvas = document.createElement("canvas");
canvas.style = "border: black; border-style: dashed;";
canvas.width = 30;
canvas.height = 30;
document.body.appendChild(canvas);
let ctx = canvas.getContext("2d");
let gradient = ctx.createRadialGradient(15, 15, 5, 15, 15, 12);
gradient.addColorStop(0, "green");
gradient.addColorStop(1, "black");
ctx.fillStyle = gradient;
ctx.fillRect(1, 1, 29, 29);
return ctx.getImageData(0, 0, canvas.width, canvas.height);
}
function webGLGradientCanvasDataURL() {
let canvas = document.createElement("canvas");
canvas.id = "glcanvas";
canvas.style = "border: black; border-style: dashed;";
canvas.width = 640;
canvas.height = 480;
document.body.appendChild(canvas);
return getCanvasDataURL(canvas);
}
function fullTextCanvasImageData() {
let canvas = document.createElement("canvas");
canvas.style = "border: black; border-style: dashed;";
document.body.appendChild(canvas);
let ctx = canvas.getContext("2d");
// Text with lowercase/uppercase/punctuation symbols (inspired by BrowserLeaks)
ctx.beginPath();
let txt = "WebKit,org <canvas> 1.0";
ctx.textBaseline = "top";
// The most common type
ctx.font = "14px 'Arial'";
ctx.textBaseline = "alphabetic";
ctx.fillStyle = "#f60";
ctx.fillRect(80,1,62,20);
// Some tricks for color mixing to increase the difference in rendering
ctx.fillStyle = "#069";
ctx.fillText(txt, 2, 15);
ctx.fillStyle = "rgba(102, 204, 0, 0.7)";
ctx.fillText(txt, 4, 17);
return ctx.getImageData(0, 0, canvas.width, canvas.height);
}
function initialCanvasImageDataAsObject(imageData, length) {
if (length < 0)
return {};
if (length > imageData.data.length)
length = imageData.data.length;
let obj = {};
for (let i = 0; i < length; ++i)
obj[i] = imageData.data[i];
return obj;
}
function isHorizontalLinearGradientCanvasGradient() {
let imageData = fullHorizontalLinearGradientCanvasImageData();
for (let i = 4; i < 29*4; ++i) {
if (imageData.data[i - 4] <= imageData.data[i] && imageData.data[i] <= imageData.data[i + 4])
continue;
if (imageData.data[i - 4] >= imageData.data[i] && imageData.data[i] >= imageData.data[i + 4])
continue;
return false;
}
return true;
}
function isVerticalLinearGradientCanvasGradient() {
let imageData = fullVerticalLinearGradientCanvasImageData();
let prevColor = [ imageData.data[0], imageData.data[1], imageData.data[2], imageData.data[3] ];
for (let i = 8; i < 29*4; ++i) {
if (imageData.data[i - 4*2] <= imageData.data[i] && imageData.data[i] <= imageData.data[i + 4*2])
continue;
if (imageData.data[i - 4*2] >= imageData.data[i] && imageData.data[i] >= imageData.data[i + 4*2])
continue;
return false;
}
return true;
}
function initialTextCanvasImageDataAsObject(length) {
return initialCanvasImageDataAsObject(fullTextCanvasImageData(), length);
}
function initialHorizontalLinearGradientCanvasImageDataAsObject(length) {
return initialCanvasImageDataAsObject(fullHorizontalLinearGradientCanvasImageData(), length);
}
function initialVerticalLinearGradientCanvasImageDataAsObject(length) {
return initialCanvasImageDataAsObject(fullVerticalLinearGradientCanvasImageData(), length);
}
function initialRadialGradientCanvasImageDataAsObject(length) {
return initialCanvasImageDataAsObject(fullRadialGradientCanvasImageData(), length);
}
async function fullCanvasHash(data) {
if (!data)
data = fullTextCanvasImageData();
return await digestMessage(data.data);
}
</script>
</body>
</html>
|
