[B<-in filename>]
[B<-out filename>]
[B<-key keyfile>]
+[B<-keyform PEM|DER|ENGINE>]
[B<-passin arg>]
[B<-challenge string>]
[B<-pubkey>]
B<-in>, B<-noout>, B<-spksect> and B<-verify> options are ignored if
present.
+=item B<-keyform PEM|DER|ENGINE>
+
+Whether the key format is PEM, DER, or an engine-backed key.
+The default is PEM.
+
=item B<-passin password>
The input file password source. For more information about the format of B<arg>