RFR: JDK-8338587 - Internal XOF Methods for SHAKE128 and SHAKE256 [v3]

[Ferenc Rakoczi]

> In preparation for the new PQC algorithms implementations, internal XOF (eXtendable Output Function) methods are added to the SHAKE128 and SHAKE256 implementations.

Ferenc Rakoczi has updated the pull request incrementally with one additional commit since the last revision:

  fixed comment, added test contributed by Weijun

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Changes:
  - all: https://git.openjdk.org/jdk/pull/20631/files
  - new: https://git.openjdk.org/jdk/pull/20631/files/8cfad070..394e6f13

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20631&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20631&range=01-02

  Stats: 98 lines in 3 files changed: 97 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/20631.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20631/head:pull/20631

PR: https://git.openjdk.org/jdk/pull/20631