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

Werner Koch wk at
Wed Dec 22 16:46:52 CET 2021

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.



Die Gedanken sind frei.  Ausnahmen regelt ein Bundesgesetz.
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