RFR: 8256363: Define toString() for MGF1ParameterSpec

[Weijun Wang]

On Fri, 13 Nov 2020 21:13:54 GMT, Weijun Wang <weijun at openjdk.org> wrote:

> Without this method, `PSSParameterSpec::toString` shows something like:
> MD: SHA-256
> MGF: java.security.spec.MGF1ParameterSpec at 77b52d12
> SaltLength: 32
> TrailerField: 1
> This is ugly.
> 
> Noreg-trivial.

Do you want me to consolidate `PSSParameterSpec::toString` into one line? Multi-line toString is usually not very friendly to debug output (esp for grep).

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PR: https://git.openjdk.java.net/jdk/pull/1208