On Mon, 2 May 2022 21:14:21 GMT, Valerie Peng <valer...@openjdk.org> wrote:

>> Then what does "cannot generate parameter values" mean? Any example?
>
> An example is RSASSA-PSS, i.e. it requires the caller to explicitly state 
> which message digest to use, etc.

You listed 2 cases when null is returned: 1) not supplied. 2) cannot generate. 
My understanding is that the RSASSA-PSS case is 1), and the EdDSA case is 2). 
This is why I suggested an "or" relation between them.

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PR: https://git.openjdk.java.net/jdk/pull/8396

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