html-over-dns/content/scripts/verifier.js

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JavaScript
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class Verifier {
/***
* @param content Content
*/
async verify(content) {
if (!window.isSecureContext) return;
if (typeof TextEncoder === "undefined") return;
if (typeof crypto === "undefined") return;
const encoder = new TextEncoder();
const digestBuffer = await crypto.subtle.digest(content.index.hashAlgorithm, encoder.encode(content.content));
const hashArray = Array.from(new Uint8Array(digestBuffer)); // convert buffer to byte array
const digest = hashArray.map(b => b.toString(16).padStart(2, '0')).join(''); // convert bytes to hex string
if (content.index.hash === digest) {
document.getElementById("verification").innerHTML =
"The hash of the content is verified to correspond with the hash" +
" in the metadata. You are now reading exactly what was intended.";
}
}
}