[B<-out file>]
[B<-sigfile file>]
[B<-inkey file>]
-[B<-keyform PEM|DER>]
+[B<-keyform PEM|DER|ENGINE>]
[B<-passin arg>]
[B<-peerkey file>]
-[B<-peerform PEM|DER>]
+[B<-peerform PEM|DER|ENGINE>]
[B<-pubin>]
[B<-certin>]
[B<-rev>]
the input key file, by default it should be a private key.
-=item B<-keyform PEM|DER>
+=item B<-keyform PEM|DER|ENGINE>
the key format PEM, DER or ENGINE.
the peer key file, used by key derivation (agreement) operations.
-=item B<-peerform PEM|DER>
+=item B<-peerform PEM|DER|ENGINE>
the peer key format PEM, DER or ENGINE.