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bigmomma (David McGurty)
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Jan 18 2023, 2:31 AM (65 w, 4 d)
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Jan 18 2023

bigmomma added a comment to T5464: Failure to import Curve25519 ECDH secret subkey to the GnupG..

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.

Jan 18 2023, 6:30 PM · Support, gnupg, OpenPGP
bigmomma added a comment to T5464: Failure to import Curve25519 ECDH secret subkey to the GnupG..

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.

Jan 18 2023, 3:38 PM · Support, gnupg, OpenPGP
bigmomma added a comment to T5464: Failure to import Curve25519 ECDH secret subkey to the GnupG..

@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

Jan 18 2023, 3:27 PM · Support, gnupg, OpenPGP
bigmomma added a comment to T5464: Failure to import Curve25519 ECDH secret subkey to the GnupG..

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.

Jan 18 2023, 3:12 PM · Support, gnupg, OpenPGP