gpgme: gpgme_op_sign '[User ID hint missing]' in passphrase callback

[Bart Trojanowski]

On 22 Jun 2001, Werner Koch wrote:
>  bt> 	ENTER
>  bt> 	[User ID hint missing]
>  bt> 	726AB1F7B4322C84
>
> ENTER ist just a keyword, the next line should give you a hint about
> the user ID, i.e a text which can be displayed and the 3rd line is the
> long keyID *you may want to display only the last 8 hexdigits.

So I should be able to use this last line to query gpgme for the name
associated with the key, right?  Can this be done from within the
passphrase callback.  Do I need a second context?