crypto-keygen-suite/keyGen/encryptandecrypt/bases/ProtocolFrameworks/double_ratchet.js

Key generation utilities for cryptographic operations. YES I RENAMED IT OMG BASES AND PROTOCOLS!!! See its folder for all <3

import yargs from 'yargs/yargs';
import { hideBin } from 'yargs/helpers';
import crypto from 'crypto';

// Double Ratchet Key Update Logic (Encryption-Only)
class DoubleRatchet {
    constructor() {
        this.rootKey = crypto.randomBytes(32);
        this.chainKey = crypto.randomBytes(32);
        this.sendingChainKey = this.chainKey;
    }

    deriveKeys(chainKey) {
        const hmac = crypto.createHmac('sha256', chainKey);
        hmac.update('ratchet key update');
        const derivedKeys = hmac.digest();
        return {
            messageKey: derivedKeys.slice(0, 32),
            nextChainKey: derivedKeys.slice(32),
        };
    }

    ratchetStep() {
        this.chainKey = crypto.randomBytes(32);
        this.sendingChainKey = this.chainKey;
        console.log("🔄 New ratchet key generated!");
    }

    encryptMessage(message) {
        if (!this.sendingChainKey) {
            this.ratchetStep();
        }

        const { messageKey, nextChainKey } = this.deriveKeys(this.sendingChainKey);
        this.sendingChainKey = nextChainKey;

        const nonce = crypto.randomBytes(12);
        const cipher = crypto.createCipheriv('aes-256-gcm', messageKey, nonce);
        const encrypted = Buffer.concat([cipher.update(message, 'utf8'), cipher.final()]);
        const authTag = cipher.getAuthTag();

        return Buffer.concat([nonce, authTag, encrypted]).toString('hex');
    }
}

// CLI Setup
async function main() {
    const argv = yargs(hideBin(process.argv))
        .option('mode', {
            alias: 'm',
            type: 'string',
            choices: ['ratchet', 'encrypt'],
            describe: 'Trigger a ratchet update or encrypt a message',
        })
        .option('message', {
            alias: 'msg',
            type: 'string',
            describe: 'Message to encrypt',
        })
        .help()
        .argv;

    const ratchet = new DoubleRatchet();

    if (argv.mode === 'ratchet') {
        ratchet.ratchetStep();
        console.log("🔄 Ratchet key updated!");
    } else if (argv.mode === 'encrypt') {
        if (!argv.message) {
            console.error("❌ Encryption requires a message!");
            return;
        }
        const encryptedMessage = ratchet.encryptMessage(argv.message);
        console.log(`🔐 Encrypted Message (Hex): ${encryptedMessage}`);
    } else {
        console.error("❌ Invalid mode. Use --mode ratchet | encrypt");
    }
}

console.log("🚀 Debug: Running main function...");
main();