-1 is returned if an error occurs while checking the key.
If the key is invalid or an error occurred, the reason code can be
-obtained using ERR_get_error(3).
+obtained using L<ERR_get_error(3)|ERR_get_error(3)>.
=head1 SEE ALSO
-rsa(3), err(3)
+L<rsa(3)|rsa(3)>, L<err(3)|err(3)>
=head1 HISTORY