As already mentioned in the October 2015 thread “Bad secret key” on
<gpg4win-users...@wald.intevation.org>, I cannot generate a 4096 bit on
my [OpenPGP card][1]. What could be the issue?
Details:
$ uname -a
Linux felix-arch 4.2.3-1-ARCH #1 SMP PREEMPT Sat Oct 3 18:52:50 CEST
2015 x86_64 GNU/Linux
$ gpg --version
gpg (GnuPG) 2.1.9
libgcrypt 1.6.4
[…]
$ gpg --card-edit
Application ID ...: D2760001240102010005000040D80000
Version ..........: 2.1
Manufacturer .....: ZeitControl
Serial number ....: 000040D8
Name of cardholder: Felix Klee
Language prefs ...: de
Sex ..............: unspecified
URL of public key : [not set]
Login data .......: [not set]
Signature PIN ....: not forced
Key attributes ...: rsa2048 rsa2048 rsa2048
Max. PIN lengths .: 32 32 32
PIN retry counter : 3 0 3
Signature counter : 0
Signature key ....: [none]
Encryption key....: [none]
Authentication key: [none]
General key info..: [none]
gpg/card> admin
Admin commands are allowed
gpg/card> generate
Make off-card backup of encryption key? (Y/n) n
What keysize do you want for the Signature key? (2048) 4096
The card will now be re-configured to generate a key of 4096 bits
Note: There is no guarantee that the card supports the requested
size. If the key generation does not succeed, please check the
documentation of your card to see what sizes are allowed.
gpg: error changing size of key 1 to 4096 bits: Invalid data
[1]: http://g10code.com/p-card.de.html
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