questions on using ed25519

[Nicola Tuveri]

On Thu, 23 Apr 2020 at 11:02, Matt Caswell <matt at openssl.org> wrote:

>
>
> On 22/04/2020 18:12, Viktor Dukhovni wrote:
> > sadly the
> > EVP_PKEY_METHOD for ed25519 has a NULL sign() member, instead, somewhat
> > ironically, it has a digestsign() method.  This is presumably to
> > distinguish between the pure and prehash variants.  Therefore, presently
> > pkeyutl(1) indeed appears to not implement signing and verifying with
> > ed25519, this looks doable with modest effort.
>
>
> I'm fairly sure it used to have a "sign" function during the dev phase -
> but it was taken out. I forget the reasoning.
>

Yes, that change was intentional, the reasoning is detailed in the
discussion in: https://github.com/openssl/openssl/pull/6284

Nicola
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