Add parameters to `MessageDigest` and introduce `SHAKE256-LEN` with an integer parameter.
------------- Commit messages: - new class spec - more changes - initial change Changes: https://git.openjdk.org/jdk/pull/16660/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16660&range=00 Issue: https://bugs.openjdk.org/browse/JDK-4936767 Stats: 505 lines in 11 files changed: 410 ins; 65 del; 30 mod Patch: https://git.openjdk.org/jdk/pull/16660.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/16660/head:pull/16660 PR: https://git.openjdk.org/jdk/pull/16660
