B<openssl> B<ec>
[B<-help>]
-[B<-inform> B<DER>|B<PEM>]
+[B<-inform> B<DER>|B<PEM>|B<P12>|B<ENGINE>]
[B<-outform> B<DER>|B<PEM>]
[B<-in> I<filename>]
[B<-passin> I<arg>]
Print out a usage message.
-=item B<-inform> B<DER>|B<PEM>, B<-outform> B<DER>|B<PEM>
+=item B<-inform> B<DER>|B<PEM>|B<P12>|B<ENGINE>
-The input and formats; the default is B<PEM>.
+The key input format; the default is B<PEM>.
+The only value with effect is B<ENGINE>; all others have become obsolete.
+See L<openssl(1)/Format Options> for details.
+
+=item B<-outform> B<DER>|B<PEM>
+
+The key output formats; the default is B<PEM>.
See L<openssl(1)/Format Options> for details.
Private keys are an SEC1 private key or PKCS#8 format.