RFR: 8325448: Hybrid Public Key Encryption [v44]

[Weijun Wang]

> Implement HPKE as defined in https://datatracker.ietf.org/doc/rfc9180/.
> <img alt="image" src="https://github.com/user-attachments/assets/366a9f3e-375a-48fb-8ee6-95cabcfeccc8" />

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

  more key checks; some small spec change

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18411/files
  - new: https://git.openjdk.org/jdk/pull/18411/files/1ec31cf5..b86797a6

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18411&range=43
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18411&range=42-43

  Stats: 72 lines in 4 files changed: 30 ins; 13 del; 29 mod
  Patch: https://git.openjdk.org/jdk/pull/18411.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18411/head:pull/18411

PR: https://git.openjdk.org/jdk/pull/18411