OPENSSL-ENGINE(1SSL) OpenSSL OPENSSL-ENGINE(1SSL)
NAME
openssl-engine - load and query engines
SYNOPSIS
openssl engine [-help] [-v] [-vv] [-vvv] [-vvvv] [-c] [-t] [-tt] [-pre
command] ... [-post command] ... [engine ...]
DESCRIPTION
This command has been deprecated. Providers should be used instead of
engines.
This command is used to query the status and capabilities of the
specified engines. Engines may be specified before and after all other
command-line flags. Only those specified are queried.
OPTIONS
-help
Display an option summary.
-v -vv -vvv -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.
-c Lists the capabilities of each engine.
-t Tests if each specified engine is available, and displays the
answer.
-tt Displays an error trace for any unavailable engine.
-pre command
-post command
Command-line configuration of engines. The -pre command is given to
the engine before it is loaded and the -post command is given after
the engine is loaded. The command is of the form cmd:val where cmd
is the command, and val is the value for the command. See the
example below.
These two options are cumulative, so they may be given more than
once in the same command.
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 rsax engine:
$ openssl engine -c
(rsax) RSAX engine support
[RSA]
(dynamic) Dynamic engine loading support
ENVIRONMENT
OPENSSL_ENGINES
The path to the engines directory.
SEE ALSO
openssl(1), config(5)
HISTORY
This command was deprecated in OpenSSL 3.0.
COPYRIGHT
Copyright 2016-2020 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the Apache License 2.0 (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
<https://www.openssl.org/source/license.html>.
3.5.4 2025-09-30 OPENSSL-ENGINE(1SSL)
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