RFR: 4936767: Parameters for MessageDigest [v8]

[Weijun Wang]

> Add parameters to `MessageDigest` and introduce new `MessageDigest` algorithms 'SHAKE128-LEN` and `SHAKE256-LEN` with an integer parameter.

Weijun Wang has updated the pull request incrementally with one additional commit since the last revision:

  useless imports

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Changes:
  - all: https://git.openjdk.org/jdk/pull/16660/files
  - new: https://git.openjdk.org/jdk/pull/16660/files/711d6cae..0e80dea0

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16660&range=07
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16660&range=06-07

  Stats: 3 lines in 2 files changed: 0 ins; 3 del; 0 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