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

[Valerie Peng]

On Wed, 27 Apr 2022 23:19:56 GMT, Valerie Peng <valeriep at openjdk.org> wrote:

>>> What does it refer to with 'it'? Is 'it' refer to the implementation generated parameter values?
>> 
>> 'It' refers to the parameters containing all of the parameter values including the supplied ones and provider-generated ones if any.
>
> Can you clarify what is the A and B that you are referring to? The way I read it, it has more than 2 conditions... So, best to clarify the conditions first. 
> I see your point with the wording suggestion at the end. Was a bit lost when trying to go through the various if-else logic and figure out what you mean...

With Signature class, there is a caveat for EdDSA, the supplied parameters are set but null is being returned when getParameters() is called. This is currently covered by the condition `if the underlying signature implementation supports returning the parameters as {@code AlgorithmParameters}` as the underlying signature does not support AlgorithmParameters for the supplied EdDSAParameterSpec object due to lack of ASN.1 definition.

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