[RFR] 8166597: Crypto support for the EdDSA Signature Algorithm (JEP 339)

[Anthony Scarpino]

Hi

I need a code review for the EdDSA support in JEP 339.  The code builds 
on the existing java implemented constant time classes used for XDH and 
the NIST curves.  The change also adds classes to the public API to 
support EdDSA operations.

All information about the JEP is located at:
JEP 339: https://bugs.openjdk.java.net/browse/JDK-8199231
CSR: https://bugs.openjdk.java.net/browse/JDK-8190219

webrev: https://cr.openjdk.java.net/~ascarpino/8166597/webrev/

thanks

Tony