On 10/10/2017 01:38 PM, Matthias Apitz wrote:
it would be nice transfer some small files together with the USB OpenPGP-card. Is there some memory for read/write on them, maybe with some commands of the card daemon?
The OpenPGP Card specification defines "Private Use Data Objects" that you may use to store arbitrary data.
You can write to those DO using the "privatedo" command of the GnuPG's card editor. For example, to send the contents of the test1.txt file to the private DO #1:
$ gpg --card-edit gpg/card> privatedo 1 < test1.txt Caveats to be aware of:* In versions 2.0 and 2.1 of the OpenPGP Card specification, private DOs are limited in size to 254 bytes each. (In version 3, there is no upper limit fixed in the specification.)
* Private DOs are optional and not all implementations support them. (Yubico's Yubikey NEO does not, for example).
Damien
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