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ssl.html
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ssl.html
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<body>
<div class="centered">
<h1>SSL Metadata Viewer - TEST</h1>
<br>
<label for="urlInput">URL:</label>
<input type="text" id="urlInput" placeholder="https://nopessl.org" style="width: 300px;">
<button onclick="getSSLCertMetadata(document.getElementById('urlInput').value)">GO</button>
<br><Br>
<div id="sslCertInfo" class="output">metadataInfo</div>
</div>
<div class="libleft">
NopeSSL.org
</div>
</body>
<script>
async function getSSLCertMetadata(url) {
try {
const response = await fetch(url);
if (!response.ok) {
throw new Error('Failed to fetch the URL.');
}
const cert = await response.arrayBuffer();
const certInfo = parseCertificate(cert);
displayCertInfo(certInfo);
} catch (error) {
document.getElementById('sslCertInfo').innerText = error.message;
}
}
function parseCertificate(buffer) {
const byteArray = new Uint8Array(buffer);
const cert = parseASN1(byteArray);
const tbsCertificate = cert.sub[0];
const issuer = getName(tbsCertificate.sub[3]);
const subject = getName(tbsCertificate.sub[5]);
const validFrom = tbsCertificate.sub[4].sub[0].content();
const validTo = tbsCertificate.sub[4].sub[1].content();
const sanExtension = tbsCertificate.sub.find(sub => sub.tag.tagNumber === 3 && sub.sub[0].content() === '2.5.29.17');
const sans = sanExtension ? parseSAN(sanExtension.sub[1]) : [];
return {
issuer,
subject,
validFrom,
validTo,
sans
};
}
function getName(rdn) {
return rdn.sub.map(set => set.sub[0].content()).join(', ');
}
function parseSAN(san) {
return san.sub.map(item => item.content()).join(', ');
}
function parseASN1(byteArray) {
let offset = 0;
function readLength() {
let length = byteArray[offset++];
if (length & 0x80) {
const nBytes = length & 0x7F;
length = 0;
for (let i = 0; i < nBytes; i++) {
length = (length << 8) | byteArray[offset++];
}
}
return length;
}
function readASN1() {
const tag = byteArray[offset++];
const length = readLength();
const end = offset + length;
const sub = [];
while (offset < end) {
sub.push(readASN1());
}
return { tag, length, sub, content: () => String.fromCharCode.apply(null, byteArray.slice(offset - length, offset)) };
}
return readASN1();
}
function displayCertInfo(cert) {
const metadataInfo = `
<strong>Issuer:</strong> ${cert.issuer}<br>
<strong>Subject:</strong> ${cert.subject}<br>
<strong>Valid From:</strong> ${cert.validFrom}<br>
<strong>Valid To:</strong> ${cert.validTo}<br>
<strong>Subject Alternative Names (SANs):</strong> ${cert.sans.join(', ')}
`;
document.getElementById('sslCertInfo').innerHTML = metadataInfo;
}
document.addEventListener('DOMContentLoaded', () => {
document.getElementById('checkSSLButton').addEventListener('click', () => {
const url = document.getElementById('urlInput').value.trim();
if (url) {
getSSLCertMetadata(url);
} else {
alert('Please enter a valid URL.');
}
});
});
</script>
<style type="text/css">
body {
font-family: Helvetica, Geneva, sans-serif;
}
a {
color: black;
}
.output {
font-family: monospace;
color: lime;
background-color: black;
border: 10px solid;
border-color: black;
}
.centered {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
width: 50%;
height: 50%;
font-size: calc(1vw + 1vh);
}
.centered h1 {
font-size: calc(2vw + 2vh);
}
@media (max-width: 768px) {
.centered {
width: 50%;
height: 50%;
font-size: calc(2vw + 2vh);
}
}
.libleft {
position: fixed;
left: 10;
bottom: 10;
}
</style>
</html>