RFR: 8331008: KDF Implementation (Preview) [v31]

[Kevin Driver]

> Introduce an API for Key Derivation Functions (KDFs), which are cryptographic algorithms for deriving additional keys from a secret key and other data. See [JEP 478](https://openjdk.org/jeps/478).

Kevin Driver has updated the pull request incrementally with two additional commits since the last revision:

 - method reuse
 - null/boundary/modifiability checks

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/18924/files
  - new: https://git.openjdk.org/jdk/pull/18924/files/fa60b018..beb8f6f8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18924&range=30
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18924&range=29-30

  Stats: 36 lines in 1 file changed: 16 ins; 2 del; 18 mod
  Patch: https://git.openjdk.org/jdk/pull/18924.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18924/head:pull/18924

PR: https://git.openjdk.org/jdk/pull/18924