On Tue, 13 Aug 2024 15:24:11 GMT, Kevin Driver <kdri...@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:
> 
>   addressed several review comments, namely: - renaming the getParameters 
> method - renaming the AlgorithmParameterSpec object - address some javadoc 
> exception messages - add some information to KDF class private constructor 
> javadocs - other general cleanup

src/java.base/share/classes/javax/crypto/spec/HKDFParameterSpec.java line 362:

> 360:          *
> 361:          * @param prk
> 362:          *     the pseudorandom key; may be {@code null}

Instead of stating "prk may be {@null}", how about narrow it down/clarify to 
"in the case of ExtractThenExpand, prk may be {@null} since the output of 
extract phase is used"

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

PR Review Comment: https://git.openjdk.org/jdk/pull/20301#discussion_r1716186234

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