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<ul id="index">
 <li><a href="#NAME">NAME</a></li>
 <li><a href="#SYNOPSIS">SYNOPSIS</a></li>
 <li><a href="#DESCRIPTION">DESCRIPTION</a></li>
 <li><a href="#OPTIONS">OPTIONS</a></li>
 <li><a href="#NOTES">NOTES</a></li>
 <li><a href="#SEE-ALSO">SEE ALSO</a></li>
 <li><a href="#COPYRIGHT">COPYRIGHT</a></li>
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openssl-dsaparam, dsaparam - DSA parameter manipulation and generation

<h1 id="SYNOPSIS">SYNOPSIS</h1>

openssl dsaparam [-help] [-inform DER|PEM] [-outform DER|PEM] [-in filename] [-out filename] [-noout] [-text] [-C] [-rand file...] [-writerand file] [-genkey] [-engine id] [numbits]

<h1 id="DESCRIPTION">DESCRIPTION</h1>

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

<h1 id="OPTIONS">OPTIONS</h1>

<dl>

Print out a usage message.

</dd>
<dt id="inform-DER-PEM">-inform DER|PEM</dt>
<dd>

This specifies the input format. The DER option uses an ASN1 DER encoded form compatible with RFC2459 (PKIX) DSS-Parms that is a SEQUENCE consisting of p, q and g respectively. The PEM form is the default format: it consists of the DER format base64 encoded with additional header and footer lines.

</dd>
<dt id="outform-DER-PEM">-outform DER|PEM</dt>
<dd>

This specifies the output format, the options have the same meaning and default as the -inform option.

</dd>
<dt id="in-filename">-in filename</dt>
<dd>

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.

</dd>
<dt id="out-filename">-out filename</dt>
<dd>

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.

</dd>
<dt id="noout">-noout</dt>
<dd>

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

</dd>
<dt id="text">-text</dt>
<dd>

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

</dd>
<dt id="C">-C</dt>
<dd>

This option converts the parameters into C code. The parameters can then be loaded by calling the get_dsaXXX() function.

</dd>
<dt id="genkey">-genkey</dt>
<dd>

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

</dd>
<dt id="rand-file">-rand file...</dt>
<dd>

A file or files containing random data used to seed the random number generator. Multiple files can be specified separated by an OS-dependent character. The separator is ; for MS-Windows, , for OpenVMS, and : for all others.

</dd>
<dt id="writerand-file">[-writerand file]</dt>
<dd>

Writes random data to the specified file upon exit. This can be used with a subsequent -rand flag.

</dd>
<dt id="numbits">numbits</dt>
<dd>

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.

</dd>
<dt id="engine-id">-engine id</dt>
<dd>

Specifying an engine (by its unique id string) will cause dsaparam to attempt to obtain a functional reference to the specified engine, thus initialising it if needed. The engine will then be set as the default for all available algorithms.

</dd>
</dl>

<h1 id="NOTES">NOTES</h1>

PEM format DSA parameters use the header and footer lines:

<pre><code> -----BEGIN DSA PARAMETERS-----
 -----END DSA PARAMETERS-----</code></pre>

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

<a href="../man1/gendsa.html">gendsa(1)</a>, <a href="../man1/dsa.html">dsa(1)</a>, <a href="../man1/genrsa.html">genrsa(1)</a>, <a href="../man1/rsa.html">rsa(1)</a>

<h1 id="COPYRIGHT">COPYRIGHT</h1>

Licensed under the OpenSSL license (the &quot;License&quot;). 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 <a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.

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