RFR: 8331008: Implement JEP 478: Key Derivation Function API (Preview) [v28]

[Kevin Driver]

On Mon, 13 May 2024 14:10:38 GMT, Weijun Wang <weijun at openjdk.org> wrote:

>> src/java.base/share/classes/javax/crypto/spec/HKDFParameterSpec.java line 351:
>> 
>>> 349:      * <a href="http://tools.ietf.org/html/rfc5869">RFC 5869</a>.
>>> 350:      */
>>> 351:     final class ExtractExpand implements HKDFParameterSpec {
>> 
>> This may have come up previously but I'm curious why ExtractExpand doesn't extend Extract. It's not quite an Expand because of the pseudorandom key.
>
> My opinion is that it's not worth doing. People would write `obj instanceof Extract` and forget the expand part.

Agreed.

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PR Review Comment: https://git.openjdk.org/jdk/pull/18924#discussion_r1600451197