Fixed in rM1b840a151ad7: python: Fix how to generate documentation..

It's in master (to be gnupg 2.3).
Enjoy.

Is there a blogpost or similar where the use of several smartcards following this improvement is explained to n00bs like me? :) For now all I find is this thread and some SE answers saying it does not work yet (https://security.stackexchange.com/questions/154702/gpg-encryption-subkey-on-multiple-smart-cards-issue) . If somebody could post a new answer on SE / write a small blog post or similar that would be great. Useful would be to have 1) from which versions and over is that available 2) how this works / how to use.

Fixed in master and applied to 2.2 branch too.

Seems to be fixed now.

Finished if an existing key is used. See rG6dc3846d78192e393be73c16c72750734a9174d1 for examples.

I tested with this patch (which changes use of constant-time routine when it's secure memory):

Fixed in rC0ff36e04f7cd: ecc: Remove hard-coded value for ECC_DIALECT_ED25519..

There are no betas; either you apply the patch mentioned above ( rG2f08a4f25df7) to a stock 2.2.20 or you build from the Git repo (STABLE-BRANCH-2-2, see https://gnupg.org/download/git.html).

Could you guide me to where I find the beta or snapshot, so I could test it and give you feedback? I seem to be unable to find it on my own.

Push the change to master.

That's odd. :-)

FWIW, the code was written by the author of the specs and he note in his original patch (rGe0972d3d96) :

Thanks for your report. The problem of GnuPG was that it mandated padding length < 16 bytes, which is wrong.

Pushed the changes.

It runs like:

$ gpg-connect-agent "scd devinfo --watch" /bye
S DEVINFO_START
S DEVINFO_END
S DEVINFO_STATUS new
S DEVINFO_START
S DEVICE generic D276000124010200F517000000010000 openpgp
S DEVINFO_END
S DEVINFO_STATUS removal
S DEVINFO_START
S DEVINFO_END
OK
$ 

Push the change to master.

This should work well with libksba master and gnupg/sm master.

The commits in 2019 (for libksba and gnupg/sm) handles the problem (of key generation using card).