[Sandbox]: ChaCha20 cipher suite prototype

[Jamil Nimeh]

Hi guys,

Since this is sandbox only right now and in prototype form I wanted to 
go ahead and put this out there so folks could see where the ChaCha20 
cipher suite code was headed in the new handshaking model.  This has 
been tested with small webpages using openssl and Mozilla NSS (through 
Firefox) as a client with JDK on the server side as both a standalone 
server implementation and hooked into Tomcat7.  I've also used JDK as a 
client against openssl s_server.

Disclaimer: Because of time constraints and the blocking dependency on 
the new TLS handshaking code, I want to be clear that putting this 
review out is not a commitment that this feature will make JDK 11.  I am 
putting this out though so folks can take a look at it and hopefully get 
a little ahead of the curve if there's time left to get it in after the 
new handshaker goes back.

http://cr.openjdk.java.net/~jnimeh/reviews/tls13-cc20-ciphersuite/webrev.01

--Jamil