async addPSK()

in src/keyschedule.js [66:78]

• 12 lines of code
• 3 McCabe index (conditional complexity)

  async addPSK(psk) {
    // Use the selected PSK (if any) to calculate the "early secret".
    if (psk === null) {
      psk = zeros(HASH_LENGTH);
    }
    if (this.stage !== STAGE_UNINITIALIZED) {
      throw new TLSError(ALERT_DESCRIPTION.INTERNAL_ERROR);
    }
    this.stage = STAGE_EARLY_SECRET;
    this.secret = await hkdfExtract(zeros(HASH_LENGTH), psk);
    this.extBinderKey = await this.deriveSecret('ext binder', EMPTY);
    this.secret = await this.deriveSecret('derived', EMPTY);
  }