RFR: 8305310: Calculate PublicKey from PrivateKey [v2]

[Weijun Wang]

> This code change is for DHKEM, which requires the function
> 
> pk(skX): The KEM public key corresponding to the KEM private key skX.
> 
> Only implemented for EC and XDH. Might add PKCS #11 support later.

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

  exception message, directory name

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13250/files
  - new: https://git.openjdk.org/jdk/pull/13250/files/48ecd5a0..afdd5a3a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13250&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13250&range=00-01

  Stats: 4 lines in 3 files changed: 2 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/13250.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13250/head:pull/13250

PR: https://git.openjdk.org/jdk/pull/13250