# openssl-dsaparam(1ssl) - man - phpman [OPENSSL-DSAPARAM(1SSL)](https://www.chedong.com/phpMan.php/man/OPENSSL-DSAPARAM/1SSL/markdown) OpenSSL [OPENSSL-DSAPARAM(1SSL)](https://www.chedong.com/phpMan.php/man/OPENSSL-DSAPARAM/1SSL/markdown) ## 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 The DSA parameters input format; unspecified by default. See [**openssl-format-options**(1)](https://www.chedong.com/phpMan.php/man/openssl-format-options/1/markdown) for details. ### -outform The DSA parameters output format; the default is **PEM**. See [**openssl-format-options**(1)](https://www.chedong.com/phpMan.php/man/openssl-format-options/1/markdown) for details. Parameters are a sequence of **ASN.1** **INTEGER**s: **p**, **q**, and **g**. This is compatible with RFC 2459 **DSS-Parms** structure. ### -in 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 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 -writerand See "Random State Options" in [**openssl**(1)](https://www.chedong.com/phpMan.php/man/openssl/1/markdown) for details. ### -engine See "Engine Options" in [**openssl**(1)](https://www.chedong.com/phpMan.php/man/openssl/1/markdown). 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 ### -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). ## SEE ALSO [**openssl**(1)](https://www.chedong.com/phpMan.php/man/openssl/1/markdown), [**openssl-pkeyparam**(1)](https://www.chedong.com/phpMan.php/man/openssl-pkeyparam/1/markdown), [**openssl-gendsa**(1)](https://www.chedong.com/phpMan.php/man/openssl-gendsa/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-rsa**(1)](https://www.chedong.com/phpMan.php/man/openssl-rsa/1/markdown) ## 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 <>. 3.0.2 2026-04-07 [OPENSSL-DSAPARAM(1SSL)](https://www.chedong.com/phpMan.php/man/OPENSSL-DSAPARAM/1SSL/markdown)