RFR: 8331008: Implement JEP 478: Key Derivation Function API (Preview) [v44]

[Weijun Wang]

On Thu, 19 Sep 2024 19:16:22 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:
> 
>   DPS refactor to re-enable some declared exceptions in getInstance signatures

src/java.base/share/classes/javax/crypto/KDF.java line 665:

> 663: 
> 664:     private static boolean checkSpiNonNull(Delegate d) {
> 665:         return (d != null && d.spi() != null);

Can `d.spi() == null` ever happen?

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PR Review Comment: https://git.openjdk.org/jdk/pull/20301#discussion_r1767511360