@baileys-md/baileys/lib/Signal/Group/sender-message-key.js

Baileys WhatsApp API

//========================================//
 
import { deriveSecrets } from "libsignal-xeuka/src/crypto.js";

export class SenderMessageKey {
  constructor(iteration, seed) {
    const derivative = deriveSecrets(seed, Buffer.alloc(32), Buffer.from("WhisperGroup"));
    const keys = new Uint8Array(32);
    keys.set(new Uint8Array(derivative[0].slice(16)));
    keys.set(new Uint8Array(derivative[1].slice(0, 16)), 16);
    this.iv = Buffer.from(derivative[0].slice(0, 16));
    this.cipherKey = Buffer.from(keys.buffer);
    this.iteration = iteration;
    this.seed = seed;
  }
  getIteration() {
    return this.iteration;
  }
  getIv() {
    return this.iv;
  }
  getCipherKey() {
    return this.cipherKey;
  }
  getSeed() {
    return this.seed;
  }
}