RocketChat/Rocket.Chat

import { Session } from '../../../../app/ecdh/Session';

export class ServerSession extends Session {
    async init(clientPublic: string): Promise<void> {
        const sodium = await this.sodium();

        const staticSeed = process.env.STATIC_SEED;

        if (!staticSeed?.trim()) {
            console.error('STATIC_SEED environment variable is required');
            process.exit(1);
        }

        const serverKeypair = await sodium.crypto_kx_seed_keypair(staticSeed + clientPublic);
        this.secretKey = await sodium.crypto_box_secretkey(serverKeypair);
        this.publicKey = await sodium.crypto_box_publickey(serverKeypair);

        const [decryptKey, encryptKey] = await sodium.crypto_kx_server_session_keys(
            this.publicKey,
            this.secretKey,
            this.publicKeyFromString(clientPublic),
        );

        this.decryptKey = decryptKey;
        this.encryptKey = encryptKey;
    }
}