The KEM API and DHKEM impl. Note that this PR uses new methods in https://github.com/openjdk/jdk/pull/13250.
------------- Commit messages: - the fix Changes: https://git.openjdk.org/jdk/pull/13256/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13256&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8297878 Stats: 2222 lines in 9 files changed: 2214 ins; 0 del; 8 mod Patch: https://git.openjdk.org/jdk/pull/13256.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/13256/head:pull/13256 PR: https://git.openjdk.org/jdk/pull/13256
