RFR: 8331008: Implement JEP 478: Key Derivation Function API (Preview) [v22]

[Viktor Klang]

On Fri, 30 Aug 2024 23:26:12 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:
> 
>   change impl class to use byte arrays rather than SecretKey objects where possible

src/java.base/share/classes/javax/crypto/KDF.java line 74:

> 72:  * single object concurrently should synchronize amongst themselves and
> 73:  * provide the necessary locking. Multiple threads each manipulating separate
> 74:  * objects need not synchronize.

That's great information to the reader, nice! 👍

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PR Review Comment: https://git.openjdk.org/jdk/pull/20301#discussion_r1745786022