async recvHandshakeMessage()

in src/states.js [287:303]

• 13 lines of code
• 2 McCabe index (conditional complexity)

  async recvHandshakeMessage(msg) {
    if (! (msg instanceof Finished)) {
      throw new TLSError(ALERT_DESCRIPTION.UNEXPECTED_MESSAGE);
    }
    // Verify server Finished MAC.
    const keyschedule = this.conn._keyschedule;
    await keyschedule.verifyFinishedMAC(keyschedule.serverHandshakeTrafficSecret, msg.verifyData, this._serverFinishedTranscript);
    // Send our own Finished message in return.
    // This must be encrypted with the handshake traffic key,
    // but must not appear in the transcript used to calculate the application keys.
    const clientFinishedMAC = await keyschedule.calculateFinishedMAC(keyschedule.clientHandshakeTrafficSecret);
    await keyschedule.finalize();
    await this.conn._sendHandshakeMessage(new Finished(clientFinishedMAC));
    await this.conn._setSendKey(keyschedule.clientApplicationTrafficSecret);
    await this.conn._setRecvKey(keyschedule.serverApplicationTrafficSecret);
    await this.conn._transition(CLIENT_CONNECTED);
  }