RFR: 8331008: Implement JEP 478: Key Derivation Function API (Preview) [v57]

[Valerie Peng]

On Mon, 14 Oct 2024 23:01:15 GMT, Kevin Driver <kdriver at openjdk.org> wrote:

>> 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).
>> 
>> Work was begun in [another PR](https://github.com/openjdk/jdk/pull/18924).
>
> Kevin Driver has updated the pull request incrementally with one additional commit since the last revision:
> 
>   test case formatting changes, etc

test/jdk/com/sun/crypto/provider/KDF/HKDFKnownAnswerTests.java line 113:

> 111:         int testsPassed = 0;
> 112: 
> 113:         int testNo = 0;

Why not also use `null` for `salt` as well?

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

PR Review Comment: https://git.openjdk.org/jdk/pull/20301#discussion_r1802052141