[B<-sigfile file>]
[B<-inkey file>]
[B<-keyform PEM|DER>]
+[B<-passin arg>]
[B<-peerkey file>]
[B<-peerform PEM|DER>]
[B<-pubin>]
[B<-pkeyopt opt:value>]
[B<-hexdump>]
[B<-asn1parse>]
+[B<-engine id>]
=head1 DESCRIPTION
=item B<-keyform PEM|DER>
-the key format PEM or DER.
+the key format PEM, DER or ENGINE.
+
+=item B<-passin arg>
+
+the input 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<-peerkey file>
=item B<-peerform PEM|DER>
-the peer key format PEM or DER.
+the peer key format PEM, DER or ENGINE.
+
+=item B<-engine id>
+
+specifying an engine (by its unique B<id> string) will cause B<pkeyutl>
+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.
+
=item B<-pubin>