}
	if transcript != nil {
		transcript.Write(data)
	}

	return c.writeRecordLocked(recordTypeHandshake, data)
}

// writeChangeCipherRecord writes a ChangeCipherSpec message to the connection and
// updates the record layer state.
func (c *Conn) writeChangeCipherRecord() error {
	c.out.Lock()
	defer c.out.Unlock()
	_, err := c.writeRecordLocked(recordTypeChangeCipherSpec, []byte{1})
	return err
}

func (hs *clientHandshakeStateTLS13) sendDummyChangeCipherSpec() error {
	if hs.c.quic != nil {
		return nil
	}
	if hs.sentDummyCCS {
		return nil
	}
	hs.sentDummyCCS = true

	return hs.c.writeChangeCipherRecord()
}

// processHelloRetryRequest handles the HRR in hs.serverHello, modifies and
// resends hs.hello, and reads the new ServerHello into hs.serverHello.

		return err
	}

	return nil
}

func (hs *serverHandshakeState) sendFinished(out []byte) error {
	c := hs.c

	if err := c.writeChangeCipherRecord(); err != nil {
		return err
	}

	finished := new(finishedMsg)
	finished.verifyData = hs.finishedHash.serverSum(hs.masterSecret)

func (hs *serverHandshakeStateTLS13) sendDummyChangeCipherSpec() error {
	if hs.c.quic != nil {
		return nil
	}
	if hs.sentDummyCCS {
		return nil
	}
	hs.sentDummyCCS = true

	return hs.c.writeChangeCipherRecord()
}

func (hs *serverHandshakeStateTLS13) doHelloRetryRequest(selectedGroup CurveID) (*keyShare, error) {
	c := hs.c

	// The first ClientHello gets double-hashed into the transcript upon a

	c.config.ClientSessionCache.Put(cacheKey, cs)
	return nil
}

func (hs *clientHandshakeState) sendFinished(out []byte) error {
	c := hs.c

	if err := c.writeChangeCipherRecord(); err != nil {
		return err
	}

	finished := new(finishedMsg)
	finished.verifyData = hs.finishedHash.clientSum(hs.masterSecret)