[Gnuk-users] Fix for NIST P-256 and secp256k1

[NIIBE Yutaka]

Hello,

Thanks to Aidan Thornton, it found that my implementation of NIST
P-256 and secp256k1 was wrong.

When I implemented Ed25519, I considered the redundant representation
for NIST P-256 and secp256k1 could be done and changed original
implementation of mine, but the approach was wrong.

Since I, for myself, don't use the curves of NIST P-256 and secp256k1,
I haven't noticed.

I believe it is fixed now.
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