RFR: 8253176: Signature.getParameters should specify that it can throw UnsupportedOperationException [v2]

[Valerie Peng]

On Tue, 3 May 2022 00:17:11 GMT, Weijun Wang <weijun at openjdk.org> wrote:

>> 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.

For EdDSA, it's really the case of the signature impl cannot convert the supplied parameter values to "AlgorithmParameters" object.

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