# man > OPENSSL-ENGINE(1SSL)

[_OPENSSL-ENGINE_(1SSL)](https://www.chedong.com/phpMan.php/man/OPENSSL-ENGINE/1SSL/markdown)                           OpenSSL                          [_OPENSSL-ENGINE_(1SSL)](https://www.chedong.com/phpMan.php/man/OPENSSL-ENGINE/1SSL/markdown)

## 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 _engine_s.  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  

### -t  

### -tt 

### -pre _
### -post _
           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)](https://www.chedong.com/phpMan.php/man/openssl/1/markdown), [**config**(5)](https://www.chedong.com/phpMan.php/man/config/5/markdown)

## 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>>.

3.0.13                                       2026-07-29                         [_OPENSSL-ENGINE_(1SSL)](https://www.chedong.com/phpMan.php/man/OPENSSL-ENGINE/1SSL/markdown)