Add supporting javascript files for pgp and hoba.

src/assets/js/hoba-pgp.js

@@ -0,0 +1,24 @@
+import {hobaResult, hobaToSign} from "./hoba.js";
+
+const alg = '969';
+
+export async function signChallenge(challenge, realm, origin, keyStore) {
+	const fingerprint = keyStore.fingerprint();
+	const nonce_array = new Uint8Array(32);
+	crypto.getRandomValues(nonce_array);
+
+	const kid_array = fingerprint;
+
+	const a_kid = btoa(String.fromCharCode.apply(null, kid_array));
+	const a_nonce = btoa(String.fromCharCode.apply(null, nonce_array));
+	const a_challenge = btoa(challenge);
+	const message = hobaToSign(a_nonce, a_kid, a_challenge, realm, origin, alg);
+	console.debug('message to sign', challenge, realm, origin, message);
+
+	const signature = await keyStore.sign(message);
+	const a_signature = btoa(signature);
+
+	const result = hobaResult(a_nonce, a_kid, a_challenge, a_signature);
+	console.debug('result', result);
+	return result;
+}

src/assets/js/hoba.js

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+export function hobaResult(nonce, kid, challenge, signature) {
+	return nonce + '.' + kid + '.' + challenge + '.' + signature;
+}
+
+export function hobaToSign(nonce, kid, challenge, realm, origin, alg) {
+	var s = '';
+	var params = [nonce, alg, origin, realm, kid, challenge];
+	for (var i = 0; i < params.length; i++) {
+		s += params[i].length + ':' + params[i];
+	}
+	return s
+}
+
+export function hobaParseChallengeHeader(s) {
+	const auth_parts = s.split(" ");
+	const auth_pairs = auth_parts[1].split(",");
+	let auth_values = {}
+	for (var i = 0; i < auth_pairs.length; i++) {
+		var auth_kv = auth_pairs[i].split(/^([^=]+)="(.+)"/);
+		auth_values[auth_kv[1]] = auth_kv[2];
+	}
+	console.debug('challenge b64', auth_values['challenge']);
+	const challenge_bytes = atob(auth_values['challenge']);
+	console.debug('challenge bytes', challenge_bytes);
+
+	return {
+		challenge: challenge_bytes,
+		realm: auth_values['realm'],
+	};
+}