[B<-binary>]
[B<-out filename>]
[B<-sign filename>]
+[B<-passin arg>]
[B<-verify filename>]
[B<-prverify filename>]
[B<-signature filename>]
digitally sign the digest using the private key in "filename".
+=item B<-passin arg>
+
+the private key password source. For more information about the format of B<arg>
+see the B<PASS PHRASE ARGUMENTS> section in L<openssl(1)|openssl(1)>.
+
=item B<-verify filename>
verify the signature using the the public key in "filename".