[B<-binary>]
[B<-nodetach>]
[B<-certfile file>]
+[B<-certsout file>]
[B<-signer file>]
[B<-recip file>]
[B<-keyid>]
be included with the message. When verifying these will be searched for
the signers certificates. The certificates should be in PEM format.
+=item B<-certsout file>
+
+any certificates contained in the message are written to B<file>.
+
=item B<-signer file>
a signing certificate when signing or resigning a message, this option can be