`KEM.getInstance` now checks if the implementation is from a signed provider if it's not builtin to JDK.
Several adjustments to the test: 1. Put one impl in `SunEC` to pretend it's builtin. This is necessary to test for provider selection. 2. When there is no need to choose a provider, use reflection to create a `KEM` object that bypasses the `getInstance` call. ------------- Commit messages: - the fix Changes: https://git.openjdk.org/jdk/pull/17253/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17253&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8322971 Stats: 119 lines in 4 files changed: 74 ins; 29 del; 16 mod Patch: https://git.openjdk.org/jdk/pull/17253.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/17253/head:pull/17253 PR: https://git.openjdk.org/jdk/pull/17253
