Added new codebook page

client/public/encryption.js

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+// encryption.js
+
+// Phonetic alphabet for table names
+const PHONETIC = ['Alpha', 'Bravo', 'Charlie', 'Delta', 'Echo', 'Foxtrot', 'Golf', 'Hotel',
+	'India', 'Juliet', 'Kilo', 'Lima', 'Mike', 'November', 'Oscar', 'Papa',
+	'Quebec', 'Romeo', 'Sierra', 'Tango', 'Uniform', 'Victor', 'Whiskey',
+	'Xray', 'Yankee', 'Zulu'];
+
+const CHARS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
+const LETTERS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
+
+// Seeded RNG using SHA256
+class SeededRandom {
+	constructor(seed) {
+		this.seed = seed;
+		this.counter = 0;
+	}
+
+	next() {
+		const hash = CryptoJS.SHA256(this.seed + ':' + this.counter);
+		this.counter++;
+		const hex = hash.toString(CryptoJS.enc.Hex);
+		return parseInt(hex.substring(0, 8), 16) / 0xFFFFFFFF;
+	}
+
+	nextInt(min, max) {
+		return Math.floor(this.next() * (max - min)) + min;
+	}
+
+	choice(arr) {
+		return arr[this.nextInt(0, arr.length)];
+	}
+}
+
+// HOTP Generation - 3 digit nonce -> 3 letter code
+function generateHOTP(secret, nonce) {
+	const rng = new SeededRandom(secret + ':hotp:' + nonce);
+	let code = '';
+	for (let i = 0; i < 3; i++) {
+		code += rng.choice(LETTERS.split(''));
+	}
+	return code;
+}
+
+// Auth Tables
+function generateAuthTable(seed, tableIndex) {
+	const rng = new SeededRandom(seed + ':table:' + tableIndex);
+	const rows = 'NOPQRSTUVWXYZ'.split('');
+	const cols = 'ABCDEFGHIJKLM'.split('');
+
+	const table = [];
+	for (let row of rows) {
+		const rowData = [];
+		for (let col of cols) {
+			rowData.push(rng.choice(CHARS.split('')));
+		}
+		table.push(rowData);
+	}
+
+	return table;
+}
+
+// One-Time Pad (for encode/decode)
+function generatePad(seed, padKey, length = 60) {
+	const rng = new SeededRandom(seed + ':pad:' + padKey);
+	const pad = [];
+	for (let i = 0; i < length; i++) {
+		pad.push(rng.nextInt(0, 256));
+	}
+	return pad;
+}
+
+function generatePadDisplay(seed, padKey) {
+	const rng = new SeededRandom(seed + ':pad:' + padKey);
+	const groups = [];
+	for (let i = 0; i < 12; i++) {
+		const num = rng.nextInt(0, 100000).toString().padStart(5, '0');
+		groups.push(num);
+	}
+	return groups.join(' ');
+}
+
+function encodeMessage(message, key, padKey, useStream = true) {
+	const messageBytes = new TextEncoder().encode(message);
+	const padLength = useStream ? messageBytes.length : 60;
+	const pad = generatePad(key, padKey, padLength);
+
+	const encoded = [];
+	for (let i = 0; i < messageBytes.length; i++) {
+		const padByte = pad[i % pad.length];
+		encoded.push(messageBytes[i] ^ padByte);
+	}
+
+	return Array.from(encoded).map(b => b.toString(16).padStart(2, '0')).join('');
+}
+
+function decodeMessage(encoded, key, padKey, useStream = true) {
+	const bytes = [];
+	for (let i = 0; i < encoded.length; i += 2) {
+		bytes.push(parseInt(encoded.substr(i, 2), 16));
+	}
+
+	const padLength = useStream ? bytes.length : 60;
+	const pad = generatePad(key, padKey, padLength);
+
+	const decoded = [];
+	for (let i = 0; i < bytes.length; i++) {
+		const padByte = pad[i % pad.length];
+		decoded.push(bytes[i] ^ padByte);
+	}
+
+	return new TextDecoder().decode(new Uint8Array(decoded));
+}