OPENSSL-DSAPARAM(1ossl)

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] [-quiet] [-rand files] [-writerand file] [-engine id] [-provider name] [-provider-path path] [-provparam [name:]key=value] [-propquery propq] [numbits] [numqbits]

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 3370 DSS-Parms structure.

-in filename
    This specifies the input file 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 file to write parameters to. Standard output is used if this option is not present. The output filename can be the same as the input filename, which leads to replacing the file contents. Note that file I/O is not atomic. The output file is truncated and then written.

-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.

-quiet
    Print fewer details about the operations being performed, which may be handy during batch scripts and pipelines.

-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 optional argument specifies that a parameter set should be generated of size numbits. If this argument is included then the input file (if any) is ignored.

numqbits
    This optional argument specifies that a parameter set should be generated with a subprime parameter q of size numqbits. It must be the last argument. If this argument is included then the input file (if any) is ignored.

-provider name
-provider-path path
-provparam [name:]key=value
-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 2000-2025 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>.