Curve25519 key generation on GnuPG card or import key to the card failures

Benoît benoit at
Wed Dec 22 20:08:31 CET 2021

Thanks Werner! So it is simply a compatibility issue with Zeitcontrol !

Do you have any info on the future Zeitcontrol 3.5 version and the
potential compatibility with Curve25519 ?

On Wed, Dec 22, 2021 at 04:46:52PM +0100, Werner Koch wrote:
>On Wed, 22 Dec 2021 14:47, Benoît said:
>> I got 3x OpenPGP Smart Card v3.3 and I am unable to generate Curve25519
>> on the card nor importing a cv/ev25519 to it.
>Whether this is supported depends on the type of the card.  The Gnuk and
>newer Yubikeys support curve25519 but the Zeitcontrol card does not
>yet.  With the Zeitcontrol cards of version 3.3 you may use the NIST and
>with 3.4 also Brainpool curves.
>   Werner
>Die Gedanken sind frei.  Ausnahmen regelt ein Bundesgesetz.


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