Method writeHandshakeRecord

conn.go:1091–1113

writeHandshakeRecord writes a handshake message to the connection and updates the record layer state. If transcript is non-nil the marshaled message is written to it.

(msg handshakeMessage, transcript transcriptHash)

// the record layer state. If transcript is non-nil the marshaled message is
// written to it.
func (c *Conn) writeHandshakeRecord(msg handshakeMessage, transcript transcriptHash) (int, error) {
	c.out.Lock()
	defer c.out.Unlock()

	data, err := msg.marshal()
	if err != nil {
		return 0, err
	}
	if transcript != nil {
		transcript.Write(data)
	}

	if c.out.handshakeBuf != nil && len(data) > 0 && data[0] != typeServerHello {
		c.out.handshakeBuf = append(c.out.handshakeBuf, data...)
		if data[0] != typeFinished {
			return len(data), nil
		}
		data = c.out.handshakeBuf
		c.out.handshakeBuf = nil
	}

	return c.writeRecordLocked(recordTypeHandshake, data)
}

// writeRecord writes a TLS record with the given type and payload to the
// connection and updates the record layer state.