I'm programming the smartcards on a bunch of YubiKey NEO tokens. Before I give the token to the user, I would like to allow them to pick a new user PIN and set it. I don't need to know their PIN and I actually don't *want* to know it.

Ideally, I would run a script, have the user type in the new PIN, and the script would run "gpg --change-pin", do another thing with the PIN string after that, then discard it.

The problem, of course, is that pinentry is launched. Now the user has to type the PIN several times. It's cumbersome and error-prone.

I've learned how to disable the pinentry GUI...

export PINENTRY_USER_DATA="USE_CURSES=1"

...but that's not much better. I tried to write an Expect script with autoexpect, but curses makes a mess of the Expect code.

I don't want to send the PIN to the clipboard and retrieve it with CTRL-V, as that's not a good place for it to be, even temporarily.

Any ideas?

--
Florin Andrei
http://florin.myip.org/

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