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openssl-dsaparam - DSA parameter manipulation and generation


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]


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.


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.
This option inhibits the output of the encoded version of the parameters.
This option prints out the DSA parameters in human readable form.
This option will generate a DSA either using the specified or generated parameters.
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.
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).


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


The -engine option was deprecated in OpenSSL 3.0.

The -C option was removed in OpenSSL 3.0.


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 <>.

2021-05-06 3.0.0-alpha16