webrev: http://cr.openjdk.java.net/~apetcher/8213363/webrev.00/ CSR: https://bugs.openjdk.java.net/browse/JDK-8213493
This change fixes a bug related to the encoded format of X25519/X448 private keys. The new code will not preserve compatibility with the improperly-formatted keys produced by the existing code. I expect the compatibility impact of this change to be minimal, as described in the CSR ticket.
