hg: jdk/sandbox: 8203228: Branch-free output conversion for X25519 and X448

[chris.hegarty at oracle.com]

Changeset: 59306e5a6cc7
Author:    apetcher
Date:      2018-06-26 11:14 -0400
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/59306e5a6cc7

8203228: Branch-free output conversion for X25519 and X448
Summary: Make some field arithmetic operations for X25519/X448 more resilient against side-channel attacks
Reviewed-by: ascarpino

! src/java.base/share/classes/sun/security/util/math/intpoly/IntegerPolynomial.java
! src/java.base/share/classes/sun/security/util/math/intpoly/IntegerPolynomial1305.java
! src/java.base/share/classes/sun/security/util/math/intpoly/IntegerPolynomial25519.java
! src/java.base/share/classes/sun/security/util/math/intpoly/IntegerPolynomial448.java