man > openssl-dsaparam(1)

OPENSSL-DSAPARAM(1SSL)                         OpenSSL                        OPENSSL-DSAPARAM(1SSL)

NAME
       openssl-dsaparam - DSA parameter manipulation and generation

SYNOPSIS
       openssl dsaparam [-help] [-inform DER|PEM] [-outform DER|PEM] [-in filename] [-out filename]
       [-noout] [-text] [-genkey] [-verbose] [-rand files] [-writerand file] [-engine id] [-provider
       name] [-provider-path path] [-propquery propq] [numbits]

DESCRIPTION
       This command is used to manipulate or generate DSA parameter files.

       DSA parameter generation can be a slow process and as a result the same set of DSA parameters
       is often used to generate several distinct keys.

OPTIONS
       -help
           Print out a usage message.

       -inform DER|PEM
           The  DSA  parameters input format; unspecified by default.  See openssl-format-options(1)
           for details.

       -outform DER|PEM
           The DSA parameters output format; the default is PEM.  See openssl-format-options(1)  for
           details.

           Parameters  are  a  sequence of ASN.1 INTEGERs: p, q, and g.  This is compatible with RFC
           2459 DSS-Parms structure.

       -in filename
           This specifies the input filename to read parameters  from  or  standard  input  if  this
           option  is  not  specified. If the numbits parameter is included then this option will be
           ignored.

       -out filename
           This specifies the output filename parameters to. Standard output is used if this  option
           is not present. The output filename should not be the same as the input filename.

       -noout
           This option inhibits the output of the encoded version of the parameters.

       -text
           This option prints out the DSA parameters in human readable form.

       -genkey
           This option will generate a DSA either using the specified or generated parameters.

       -verbose
           Print extra details about the operations being performed.

       -rand files, -writerand file
           See "Random State Options" in openssl(1) for details.

       -engine id
           See "Engine Options" in openssl(1).  This option is deprecated.

       numbits
           This  option  specifies that a parameter set should be generated of size numbits. It must
           be the last option. If this option is included then the input file (if any) is ignored.

       -provider name
       -provider-path path
       -propquery propq
           See "Provider Options" in openssl(1), provider(7), and property(7).

SEE ALSO
       openssl(1),  openssl-pkeyparam(1),  openssl-gendsa(1),   openssl-dsa(1),   openssl-genrsa(1),
       openssl-rsa(1)

HISTORY
       The -engine option was deprecated in OpenSSL 3.0.

       The -C option was removed in OpenSSL 3.0.

COPYRIGHT
       Copyright 2000-2021 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-DSAPARAM(1SSL)