Gpg: Add passphrase to gpg-agent
I want to add a passphrase to gpg-agent. I would've expected to have a command gpg-add - just like ssh-add, but there isn't...
Contrary to ssh, the gpg passphrase is not supposed to be stored for a long time. Gpg will automatically store the passphrase in gpg-agent the first time the passphrase is entered. Just make sure you have the line:
somewhere in your ~/.gnupg/gpg.conf. Most of the time this gpg behaviour will suffice. If not, there is this program:
Gpg-agent needs to be started with --allow-preset-passphrase in order for this passphrase presetting to work. Now you can do
/usr/lib/gnupg2/gpg-preset-passphrase --preset keygrip
Keygrip is a 40 character string of hexadecimal characters identifying the key for which the passphrase should be set or cleared. This keygrip is listed along with the key when running the command: gpgsm --dump-secret-keys
$ info gpg-preset-passphrase