the application sends key_update handshake message for PSK connection on TLS 1.3

[bwcc60]

I want to send key_update message in a controlled way under PSK connection on TLS 1.3. Although I didn't find any example for sending key_update message, I found the following functions at TlsProtocols.java.

protected void send13KeyUpdate(boolean updateRequested) throws IOException
protected void receive13KeyUpdate(ByteArrayInputStream buf) throws IOException

based on the Tls13PSKProtocolTest.java, it seems that the application can call send13KeyUpdate() directly. but at the function

public void writeApplicationData(byte[] buf, int off, int len)
else if (keyUpdateEnabled)
{
if (keyUpdatePendingSend)
{
send13KeyUpdate(false);
}
else if (recordStream.needsKeyUpdate())
{
send13KeyUpdate(true);
}
}
I don't know what the influence about send13KeyUpdate() inside writeApplicationData() on the application? Is there any suggestions?

thanks!

[bwcc60]

this is the feature request to expose key_update API. something like openssl SSL_key_update() at openssl

[bwcc60]

solution: wrap the class TlsProtocols, and supply the public function to call send13KeyUpdate()

[bwcc60]

resolved. see last comments