RFR: 8325448: Hybrid Public Key Encryption [v43]

[Weijun Wang]

On Fri, 12 Sep 2025 23:32:43 GMT, Weijun Wang <weijun at openjdk.org> wrote:

>> src/java.base/share/classes/javax/crypto/spec/HPKEParameterSpec.java line 286:
>> 
>>> 284:      * @throws IllegalArgumentException if {@code info} is empty.
>>> 285:      */
>>> 286:     public HPKEParameterSpec withInfo(byte[] info) {
>> 
>> After reading your example at the class javadoc level, it left me with the impression that `withInfo()` would be used with `String`.  Does it make sense to have a `withInfo(String)` method?  Or maybe the example less String-specific?
>
> Oh, I just want to be self-contained in the example and `new byte[10]` seems too trivial. Actually, it's very likely not a string. For example, in TLS Encrypted Client Hello, it's `"tls ech" || 0x00 || ECHConfig`. I don't think it's worth adding an overloaded `withInfo(String)`. It's similar to the `info` in HKDF-Expand.

I'll change the line to `.withInfo(HexFormat.of().parseHex("010203040506"))`.

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PR Review Comment: https://git.openjdk.org/jdk/pull/18411#discussion_r2352602774