RFR: 8256363: Define toString() for MGF1ParameterSpec [v2]

[Weijun Wang]

On Mon, 16 Nov 2020 18:37:13 GMT, Valerie Peng <valeriep at openjdk.org> wrote:

>> The current MGF part shows `MGF: MGF1:SHA-256`. An extra space would looks a little strange, and you don't know if the key is `MGF: MGF1` or `MGF`. I'd rather keep the current output.
>
> How about just MGF: MGF1SHA-256 or MGF: MGF1 SHA-256?
> First combines into a single string, the second uses space instead of ":". Just a suggestion.

I like the 2nd one better, but I'll see how Sean thinks about the verbose record-style toString.

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