[11u] RFR: 8241248: NullPointerException in sun.security.ssl.HKDF.extract(HKDF.java:93)

[Alexey Bakhtin]

Hello,

Could you please review the jdk11 backport of JDK-8242148:

JBS: https://bugs.openjdk.java.net/browse/JDK-8241248
Webrev 11u: http://cr.openjdk.java.net/~abakhtin/8241248_11u/webrev.v0/
Original patch: https://github.com/openjdk/jdk/commit/1603ca23422b03157afb2bd1050524465474b60e.patch

The patch is not applied clean for PreSharedKeyExtension.java and ServerHello.java files because of JDK-8211018 “Session Resumption without Server-Side State” [1] is not backported to JDK11
The merge is trivial.

Test from the bug report is passed
sun/security/ssl and javax/net/ssl jtreg tests passed

[1] https://bugs.openjdk.java.net/browse/JDK-8211018

Regards
Alexey