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<!-- POC of technical solution -->
<!doctype html>
<head>
<title>POC - Team #5</title>
<style>
/* style file of the poc, includes trivial CSS rules */
* {
font-family: arial;
margin: 0;
padding: 0;
}
body {
visibility: hidden;
}
input {
background-color: transparent;
border: none;
border-bottom: solid 4px #002beb;
font-size: 20pt;
width: 80%;
min-width: 200px;
margin: 0 10px;
}
h1 {
font-size: 28pt;
}
.btn {
background-color: #002beb;
color: white;
cursor: pointer;
margin: 5px;
border-radius: 5px;
font-size: 16pt;
border: 0px solid;
padding: 10px;
width: 130px;
}
div {
display: flex;
justify-content: center;
padding: 15px;
}
textarea {
width: 90%;
height: 300px;
}
#qr-code {
visibility: hidden;
}
#result {
visibility: hidden;
background-color: green;
color: white;
font-size: 22pt;
padding-top: 35px;
padding-bottom: 30px;
text-align: center;
font-weight: bold;
}
#wrongResult {
visibility: hidden;
background-color: rgb(189, 15, 3);
color: white;
font-size: 22pt;
padding-top: 35px;
display: block;
text-align: center;
font-weight: bold;
height: 185px;
}
#result div {
padding: 0;
margin: 0;
}
#result h3 {
margin-bottom: 15px;
}
#valid-user {
flex-wrap: wrap;
}
#qr-input {
visibility: hidden;
}
#payload-input {
width: 550px;
height: 550px;
}
#payload-container {
padding: 40px;
}
.result-container {
flex-wrap: wrap;
margin-top: 25px !important;
}
.line-container {
width: 100%;
}
.line-container div {
padding: 0 15px !important;
}
.line-container div:first-child {
justify-content: flex-end;
width: 20%;
}
.line-container div:last-child {
justify-content: flex-start;
width: 80%;
}
#content {
display: flex;
}
#content-wrapper {
display: block;
max-width: 1400px;
}
.small-font {
font-size: 18pt;
}
</style>
<script src="https://cdnjs.cloudflare.com/ajax/libs/qrious/4.0.2/qrious.min.js"></script>
<script>
/* poc or mock of y-services, includes encryption logic. This is only a technical poc! */
// set params to RSA algorithm
let ALGORIGHTM = "RSA-PSS";
let SALT_LENGTH = 32;
// create mock to store all public keys
const tmsMock = [];
// generate a UUID randomly
function generateUUID() {
return "xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx".replace(/[xy]/g, (c) => {
const r = (Math.random() * 16) | 0,
v = c == "x" ? r : (r & 0x3) | 0x8;
return v.toString(16);
});
}
// encode a message to a byte array
function encodeMessage(payload) {
const wrapper = {
payload: payload,
};
const txtEncoder = new TextEncoder();
return txtEncoder.encode(JSON.stringify(wrapper));
}
// encode to base 64
function toBase64(signature) {
const base64encoded = btoa(
String.fromCharCode.apply(null, new Uint8Array(signature))
);
return base64encoded;
}
// convert to object
function toObject(base64encoded) {
const binary_string = window.atob(base64encoded);
const len = binary_string.length;
let bytes = new Uint8Array(len);
for (var i = 0; i < len; i++) {
bytes[i] = binary_string.charCodeAt(i);
}
return bytes.buffer;
}
// verify signature and payload against public key
async function verify(publicKey, signature, message) {
let result = await window.crypto.subtle.verify(
{
name: ALGORIGHTM,
saltLength: SALT_LENGTH,
},
publicKey,
signature,
message
);
return result;
}
// sign with private key
async function sign(encodedMessage, privateKey) {
signature = await window.crypto.subtle.sign(
{
name: ALGORIGHTM,
saltLength: SALT_LENGTH,
},
privateKey,
encodedMessage
);
return signature;
}
// look for public keys in TMS and verify against
function validateQRCode(serialized) {
return new Promise((resolve, reject) => {
const marshalled = JSON.parse(serialized);
const signature = toObject(marshalled.base64);
let wrongly = 0;
for (let i = 0; i < tmsMock.length; i++) {
verify(tmsMock[i], signature, encodeMessage(marshalled.payload)).then(
(valid) => {
if (valid) {
resolve({
payload: marshalled.payload,
valid: valid,
tms: i,
});
return;
} else {
wrongly++;
}
if (wrongly === tmsMock.length) {
reject();
}
}
);
}
});
}
// generate key pair for each signing
function getDataForQRCode(payload) {
return new Promise((resolve) => {
window.crypto.subtle
.generateKey(
{
name: ALGORIGHTM,
modulusLength: 4096,
publicExponent: new Uint8Array([1, 0, 1]),
hash: "SHA-256",
},
true,
["sign", "verify"]
)
.then((keyPair) => {
tmsMock.push(keyPair.publicKey);
const encodedMessage = encodeMessage(payload);
sign(encodedMessage, keyPair.privateKey).then((signedMessage) => {
const base64encoded = toBase64(signedMessage);
resolve({
base64: base64encoded,
payload: payload,
});
});
});
});
}
</script>
<script>
/* helper function to manipulate view. This is only a technical poc! */
// define global holder for qr code
var qr;
// show valid signature users
function appendValidUser(wrapper) {
const user = `<div class='line-container'><div>USER</div><div>${wrapper.payload.firstname} ${wrapper.payload.lastname}</div></div>`;
const uuid = `<div class='line-container small-font'><div>UUID</div><div>${wrapper.payload.uuid}</div></div>`;
const keyNr = `<div class='line-container small-font'><div>KEY-NR</div><div>${wrapper.tms}</div></div>`;
const html = `${user}${uuid}${keyNr}`;
document.getElementById(
"valid-user"
).innerHTML += `<div class='result-container'>${html}</div>`;
}
// validate nested signatures
function deepValidate(data) {
validateQRCode(data).then(
(wrapper) => {
if (wrapper.valid && wrapper.payload.uuid) {
appendValidUser(wrapper);
deepValidate(wrapper.payload.data);
showProgress("TRUST ESTABLISHED!");
}
},
() => {}
);
}
// fake send to validate routine
function sendToTMS() {
const verifyInput = document.getElementById("payload-input").value;
validateQRCode(verifyInput).then(
(wrapper) => {
document.getElementById("valid-user").innerHTML = "";
document.getElementById("result").style.visibility = "hidden";
document.getElementById("wrongResult").style.visibility = "hidden";
document.getElementById("result").style.display = "none";
document.getElementById("wrongResult").style.display = "none";
if (wrapper.valid) {
document.getElementById("result").style.display = "block";
document.getElementById("result").style.visibility = "visible";
appendValidUser(wrapper);
if (wrapper.payload.data) {
deepValidate(wrapper.payload.data);
}
showProgress("TRUST ESTABLISHED!");
}
},
() => {
document.getElementById("valid-user").innerHTML = "";
document.getElementById("result").style.visibility = "hidden";
document.getElementById("wrongResult").style.visibility = "hidden";
document.getElementById("result").style.display = "none";
document.getElementById("wrongResult").style.display = "none";
document.getElementById("wrongResult").style.display = "block";
document.getElementById("wrongResult").style.visibility = "visible";
}
);
}
// fake verify of a scanned QR code (e.g., at a VKU course)
function verifyParticipation() {
document.getElementById("qr-input").value = document.getElementById(
"payload-input"
).value;
generateQRCode();
}
// generate QR Code
function generateQRCode(clear = false) {
document.getElementById("result").style.visibility = "hidden";
document.getElementById("wrongResult").style.visibility = "hidden";
if (clear) {
document.getElementById("valid-user").innerHTML = "";
document.getElementById("qr-input").value = "";
}
const qrtext = document.getElementById("qr-input").value;
const firstname = document.getElementById("firstname").value;
const lastname = document.getElementById("lastname").value;
const payload = {
data: qrtext,
firstname: firstname,
lastname: lastname,
uuid: generateUUID(),
};
getDataForQRCode(payload).then((wrapper) => {
const objJsonB64 = btoa(JSON.stringify(wrapper));
if (clear) {
showProgress("SIGNING SUCCESSFUL!");
} else {
showProgress("VERIFICATION SIGNING SUCCESSFUL!");
}
document.getElementById("payload-input").value = JSON.stringify(wrapper);
qr.set({
foreground: "black",
size: 600,
value: objJsonB64,
});
});
}
// hide and show UI elements
function toggle(id) {
if (document.getElementById(id).style.visibility === "hidden") {
document.getElementById(id).style.visibility = "visible";
document.getElementById(id).style.display = "block";
} else {
document.getElementById(id).style.visibility = "hidden";
document.getElementById(id).style.display = "none";
}
}
// show process text
function showProgress(text) {
document.getElementById("result-type").innerHTML = text;
document.getElementById("result").style.visibility = "visible";
}
// initialization
setTimeout(() => {
(function () {
qr = new QRious({
element: document.getElementById("qr-code"),
size: 600,
value: "loading QR code library...",
});
})();
generateQRCode();
setTimeout(() => {
document.getElementById("qr-code").style.visibility = "visible";
toggle("qr-code-container");
toggle("payload-container");
setTimeout(() => {
document.getElementsByTagName("body").item(0).style.visibility =
"visible";
showProgress("APPLICATION READY");
}, 500);
}, 700);
}, 200);
</script>
</head>
<body>
<div id="content">
<div id="content-wrapper">
<div>
<h1>POC Signing, QR Code & Trust Management</h1>
</div>
<div>
<input
id="qr-input"
type="text"
placeholder="Input to convert to QR Code"
value="dc9e524c-cf29-4d1f-a494-4da5f595ec3e"
/>
</div>
<div>
<input id="firstname" type="text" placeholder="Firstname" value="" />
<input id="lastname" type="text" placeholder="Lastname" value="" />
</div>
<div>
<button class="btn" onclick="generateQRCode(true)">Sign</button>
<button class="btn" onclick="toggle('qr-code-container')"
>QR Code</button
>
<button class="btn" onclick="verifyParticipation()">Verify</button>
<button class="btn" onclick="toggle('payload-container')"
>Payload</button
>
<button class="btn" onclick="sendToTMS()">Send</button>
</div>
<div>
<div id="qr-code-container">
<canvas id="qr-code"></canvas>
</div>
<div id="payload-container">
<textarea id="payload-input"></textarea>
</div>
</div>
</div>
</div>
<div id="result">
<h3 id="result-type"></h3>
<div id="valid-user"></div>
</div>
<div id="wrongResult">
<h3>WRONG INFORMATION! TRUST NOT ESTABLISHED!</h3>
</div>
</body>
</html>