[B<-in filename>]
[B<-out filename>]
[B<-key keyfile>]
+[B<-passin arg>]
[B<-challenge string>]
+[B<-pubkey>]
[B<-spkac spkacname>]
[B<-spksect section>]
[B<-noout>]
[B<-verify>]
-
+[B<-engine id>]
=head1 DESCRIPTION
B<-in>, B<-noout>, B<-spksect> and B<-verify> options are ignored if
present.
+=item B<-passin password>
+
+the input file 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<-challenge string>
specifies the challenge string if an SPKAC is being created.
don't output the text version of the SPKAC (not used if an
SPKAC is being created).
+=item B<-pubkey>
+
+output the public key of an SPKAC (not used if an SPKAC is
+being created).
+
=item B<-verify>
verifies the digital signature on the supplied SPKAC.
+=item B<-engine id>
+
+specifying an engine (by it's unique B<id> string) will cause B<req>
+to attempt to obtain a functional reference to the specified engine,
+thus initialising it if needed. The engine will then be set as the default
+for all available algorithms.
=back