# man > openssl-pkeyparam(1)

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

## NAME
       openssl-pkeyparam - public key algorithm parameter processing command

## SYNOPSIS
       **openssl pkeyparam **[**-help**] [**-in _**filename_] [**-out _**filename_] [**-text**] [**-noout**] [**-check**] [**-engine**
       _id_] [**-provider _**name_] [**-provider-path _**path_] [**-propquery _**propq_]

## DESCRIPTION
       This command processes public key algorithm parameters.  They can be checked for correctness
       and their components printed out.

## OPTIONS
### -help
           Print out a usage message.

### -in _
           This  specifies  the  input  filename  to  read parameters from or standard input if this
           option is not specified.

### -out _
           This specifies the output filename to write parameters to  or  standard  output  if  this
           option is not specified.

### -text
           Prints out the parameters in plain text in addition to the encoded version.

### -noout
           Do not output the encoded version of the parameters.

### -check
           This option checks the correctness of parameters.

### -engine _
           See "Engine Options" in [**openssl**(1)](https://www.chedong.com/phpMan.php/man/openssl/1/markdown).  This option is deprecated.

### -provider _
### -provider-path _
### -propquery _
           See "Provider Options" in [**openssl**(1)](https://www.chedong.com/phpMan.php/man/openssl/1/markdown), [**provider**(7)](https://www.chedong.com/phpMan.php/man/provider/7/markdown), and [**property**(7)](https://www.chedong.com/phpMan.php/man/property/7/markdown).

## EXAMPLES
       Print out text version of parameters:

        openssl pkeyparam -in param.pem -text

## NOTES
       There  are  no  **-inform  **or  **-outform  **options  for  this  command because only PEM format is
       supported because the key type is determined by the PEM headers.

## SEE ALSO
       [**openssl**(1)](https://www.chedong.com/phpMan.php/man/openssl/1/markdown),    [**openssl-genpkey**(1)](https://www.chedong.com/phpMan.php/man/openssl-genpkey/1/markdown),    [**openssl-rsa**(1)](https://www.chedong.com/phpMan.php/man/openssl-rsa/1/markdown),    [**openssl-pkcs8**(1)](https://www.chedong.com/phpMan.php/man/openssl-pkcs8/1/markdown),    [**openssl-dsa**(1)](https://www.chedong.com/phpMan.php/man/openssl-dsa/1/markdown),
       [**openssl-genrsa**(1)](https://www.chedong.com/phpMan.php/man/openssl-genrsa/1/markdown), [**openssl-gendsa**(1)](https://www.chedong.com/phpMan.php/man/openssl-gendsa/1/markdown)

## HISTORY
       The **-engine **option was deprecated in OpenSSL 3.0.

## COPYRIGHT
       Copyright 2006-2021 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-PKEYPARAM_(1SSL)](https://www.chedong.com/phpMan.php/man/OPENSSL-PKEYPARAM/1SSL/markdown)