await getRandomBytes()

in src/states.js [209:238]

• 21 lines of code
• 1 McCabe index (conditional complexity)

      await getRandomBytes(32),
      // Random legacy_session_id; we *could* send an empty string here,
      // but sending a random one makes it easier to be compatible with
      // the data emitted by tlslite-ng for test-case generation.
      await getRandomBytes(32),
      [
        new SupportedVersionsExtension([VERSION_TLS_1_3]),
        new PskKeyExchangeModesExtension([PSK_MODE_KE]),
        new PreSharedKeyExtension([this.conn.pskId], [zeros(HASH_LENGTH)]),
      ],
    );
    const buf = new BufferWriter();
    clientHello.write(buf);
    // Now that we know what the ClientHello looks like,
    // go back and calculate the appropriate PSK binder value.
    // We only support a single PSK, so the length of the binders field is the
    // length of the hash plus one for rendering it as a variable-length byte array,
    // plus two for rendering the variable-length list of PSK binders.
    const PSK_BINDERS_SIZE = HASH_LENGTH + 1 + 2;
    const truncatedTranscript = buf.slice(0, buf.tell() - PSK_BINDERS_SIZE);
    const pskBinder = await keyschedule.calculateFinishedMAC(keyschedule.extBinderKey, truncatedTranscript);
    buf.incr(-HASH_LENGTH);
    buf.writeBytes(pskBinder);
    await this.conn._sendHandshakeMessageBytes(buf.flush());
    await this.conn._transition(CLIENT_WAIT_SH, clientHello.sessionId);
  }
}

class CLIENT_WAIT_SH extends State {
  async initialize(sessionId) {