Help with new board Blue Pill Plus with gnuk

[NIIBE Yutaka]

Frédéric SUEL <frederic.suel at free.fr> wrote:
> I made more tests (see below) regards your comments and try to put 448 
> keys on Gnuk too

Thanks for your testing.

I found a bug for Ed448 key and pushed fixes.

Also, I added test cases for Ed448 and X448 under gnuk/tests.  (I added
the feature of supporting Ed448/X448 keys around 2019, but it was not
covered by gnuk/tests.  Apparently, it was broken after private key
encryption method was changed.  Ed448 private key is a bit different
because its private key length is not even.)

Latest commit is:

	438d89db8dd927ebaa4e93c2149f8ef9879168de

Yet, I haven't locate/identify-ed the problem of your secp256k1 key.
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