Sorry for a bit late follow up. How do you calculate a public key? RNP's crypto backend, Botan, is calculating public key without taking in account bits which should be tweaked. I.e. both tweaked and non-tweaked secret keys would produce the same public key. The same is with decryption. Could it be the case that your implementation actually used those bits to calculate a public key?

The compression check currently detects bzip2, gzip, zip, pkzip, and PDF. This also covers common document formats like odt and docx. We may add some more detection in the future. However, for large files you usually know their type and thus you better use "-z0" for already compressed data or "-z-1" if you want to force compression (may be for PDFs which often can be a shrinked to 80% or so).

So here is a redacted CLI-dump of the exact sequence I'm describing in my post. This is with untweaked keys and gpg 2.2.40 and a factory-reset yubikey.

So in case this was not clear... What I'm describing is very similar to the original description, but it is "inverted" - the untweaked key works flawlessly (import and decryption) except for keytocard. And the tweaked key can't be imported - either "Bad Secret Key" or asking for passphrase.

I am somehwat confused, my symantec system got faster. But there are some things like "Symantec Insight" which will whitelist often used files and applications, also signed files might get preferred treatment. I tried to get this slower by disabling the "Insight" and changing the "Bloodhound behavior" to agressive... So timings might not be comparable. I should probably do tests ohne without restarting my systems for a good comparison.

@onickolay Yes, I have. I have used --check-cv25519-bits and it said that it needs patching. I then did --fix-cv25519-bits and exported the key. Looking at the CV25519 private-key bytes produced by my code and by RNP, I confirmed that they did the exact same transformation.
When trying to re-import the exported key into gpg, I got the "Bad Secret Key" error again

@bigmomma Just for a quick check - did you try to use RNP's CLI command --edit-key --fix-cv25519-bits, as it's not clear from the message?

Hi! I would like to chime in on this issue as I am having some weird problems with a CV25519 sub-key and after stumbling upon this thread, I think it is related to this.
Unfortunately, I can't post the key material here, because it is my actual encryption private-key.

This can be easily tested using

Instead of using --enable-special-filenames and a separate FD the list of files is now passed to gpgtar's stdin. Similarly, we read from gpgtar's stderr instead of using a separate --logger-fd.

What about --logger-fd? Does gpgtar pass all FDs through to gpg?

Okay, I'll skip those for now.

no-tty and charset are anyway obsolete and passed only for older gpg versions. The other things should have useful defaults in gpg - in particular these defaults are taken from the same envvar as gpgme does. See send_pinentry_environment.

Another thing I have noticed when turning qt debug output on is that the qt windows platformsupport fontdatabase logs over a a timespan of over two seconds that it is adding fonts to its database.

Currently the first call to QGpgMENewCryptoConfig::reloadConfiguration happens in the GpgSM self test. Funnily enough the selftest for gpg just returns true when the empty constructors of the cryptoconfig are called. The first component load is GpgSM.

Hello ...

It is not really helpful if you publish that fact anyway on a public tracker.

We sometimes grant our customers the privilege of receiving updates a few days earlier than the community. It is not really helpful if you publish that fact anyway on a public tracker. BTW, there is no community version gpg4win 3.1.26.

If you enter a wrong password in a window, the error message will only be given after you have answered all requests for the transport passwords.

No. We now ignore expired key with --mirror, --create, and --install-key.

Another idea would be a gpgconf daemon that answers all queries from its in-memory cache. Obviously, this wouldn't help with the very first start unless the daemon is started automatically on login which should probably be default behavior at least on Windows anyway. OTOH, gpgme does already cache the config so this would only have an effect when starting Kleopatra.

Actually we should switch from putenv to SetEnvironmentVariable et al. because that avoids problems wit different Windows libc versions, for example in DLLs.

Fixed in rG8e8971403f75: w32: Fix gnupg_unsetenv..

Done (STABLE-BRANCH-2-2.40 for now)

Yes, I'll do that. Thanks for the reminder.