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=pod
=head1 NAME
openssl-engine,
engine - load and query engines
=head1 SYNOPSIS
B<openssl engine>
[ I<engine...> ]
[B<-v>]
[B<-vv>]
[B<-vvv>]
[B<-vvv>]
[B<-vvv>]
[B<-c>]
[B<-t>]
[B<-tt>]
[B<-pre> I<command>]
[B<-post> I<command>]
[ I<engine...> ]
=head1 DESCRIPTION
The B<engine> command is used to query the status and capabilities
of the specified B<engine>'s.
Engines may be specified before and after all other command-line flags.
Only those specified are queried.
=head1 OPTIONS
=over 4
=item B<-v> B<-vv> B<-vvv> B<-vvvv>
Provides information about each specified engine. The first flag lists
all the possible run-time control commands; the second adds a
description of each command; the third adds the input flags, and the
final option adds the internal input flags.
=item B<-c>
Lists the capabilities of each engine.
=item B<-t>
Tests if each specified engine is available, and displays the answer.
=item B<-tt>
Displays an error trace for any unavailable engine.
=item B<-pre> I<command>
=item B<-post> I<command>
Command-line configuration of engines.
The B<-pre> command is given to the engine before it is loaded and
the B<-post> command is given after the engine is loaded.
The I<command> is of the form I<cmd:val> where I<cmd> is the command,
and I<val> is the value for the command.
See the example below.
=back
=head1 EXAMPLES
To list all the commands available to a dynamic engine:
$ openssl engine -t -tt -vvvv dynamic
(dynamic) Dynamic engine loading support
[ unavailable ]
SO_PATH: Specifies the path to the new ENGINE shared library
(input flags): STRING
NO_VCHECK: Specifies to continue even if version checking fails (boolean)
(input flags): NUMERIC
ID: Specifies an ENGINE id name for loading
(input flags): STRING
LIST_ADD: Whether to add a loaded ENGINE to the internal list (0=no,1=yes,2=mandatory)
(input flags): NUMERIC
DIR_LOAD: Specifies whether to load from 'DIR_ADD' directories (0=no,1=yes,2=mandatory)
(input flags): NUMERIC
DIR_ADD: Adds a directory from which ENGINEs can be loaded
(input flags): STRING
LOAD: Load up the ENGINE specified by other settings
(input flags): NO_INPUT
To list the capabilities of the I<rsax> engine:
$ openssl engine -c
(rsax) RSAX engine support
[RSA]
(dynamic) Dynamic engine loading support
=head1 ENVIRONMENT
=over 4
=item B<OPENSSL_ENGINES>
The path to the engines directory.
=back
=head1 SEE ALSO
L<config(5)>
=head1 COPYRIGHT
Copyright 2016-2019 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the OpenSSL license (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file LICENSE in the source distribution or at
L<https://www.openssl.org/source/license.html>.
=cut
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