These are my notes on getting caff configured and working in order to send signed keys after the OhioLinuxFest keysigning. All of this was done on a Fedora 24 Workstation using only the standard repositories.

Installation

The pgp-tools package provides caff. It can be easily installed with yum. I also install msmtp in order to send the keys by email once they were signed.

At this point, I also configured msmtp to work with my mail provider.

Configuration

Just running caff will create a default configuration at ~/.caffrc. Edit this file with your specific options. The important changes will be

# change the name
$CONFIG{'owner'} = 'Some User';
# change the email address
$CONFIG{'email'} = 'someone@example.com';
# your keyid
$CONFIG{'keyid'} = [ qw{1234567890ABCDEF} ];

For caff to use msmtp, also add the following configuration

 $ENV{'PERL_MAILERS'} = 'sendmail:/usr/bin/msmtp';

Signing keys

At this point, I just ran caff. In the example command below keyid is the key id that will be used for signing and keys.asc is all of the public keys that will be signed.

caff --keys-from-gnupg -u <keyid> -R --key-file keys.asc

Now, caff will display each key (userid) and ask to sign.
If signed caff will email an encrypted copy of each signed uid individually.