Method exchangeKeys

packages/lib/src/device.ts:183–215

()

  }

  async exchangeKeys() {
    deviceLogger.info(`Exchanging keys for device ${this.id}`);

    if (!this.encryptionKeys.localKeys) {
      deviceLogger.debug(`Generating local keys for device ${this.id}`);
      this.encryptionKeys.localKeys = await generateKeyPair();
    }

    const { publicKey, privateKey } = this.encryptionKeys.localKeys;

    const message = new ConfigureECDHMessage({ publicKey });

    const {
      payload: {
        ecdhe: { pubkey },
      },
    } = await this.sendMessage(message);

    const remotePublicKey = Buffer.from(pubkey, 'base64');
    this.encryptionKeys.remotePublicKey = remotePublicKey;

    // derive the shared key
    const sharedKey = await deriveSharedKey(privateKey, remotePublicKey);

    // ...and now for the dumb part
    // Meross take the shared key and MD5 it
    const sharedKeyMd5 = await md5(sharedKey, 'hex');

    // then use the 32 hex characters as the shared key
    this.encryptionKeys.sharedKey = Buffer.from(sharedKeyMd5, 'utf8');

    return;
  }

  async configureDeviceTime(
    timestamp: number,