RFR: 8331008: KDF Implementation (Preview) [v28]

[Alan Bateman]

On Mon, 13 May 2024 03:46:50 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).
>
> Kevin Driver has updated the pull request incrementally with one additional commit since the last revision:
> 
>   re-enable preview annotations

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 the pseudorandom key.

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PR Review Comment: https://git.openjdk.org/jdk/pull/18924#discussion_r1598141801