220 lines
7.6 KiB
HTML
220 lines
7.6 KiB
HTML
<?xml version="1.0" ?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>dhparam</title>
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<meta http-equiv="content-type" content="text/html; charset=utf-8" />
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<link rev="made" href="mailto:root@localhost" />
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</head>
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<body style="background-color: white">
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<!-- INDEX BEGIN -->
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<div name="index">
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<p><a name="__index__"></a></p>
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<ul>
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<li><a href="#name">NAME</a></li>
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<li><a href="#synopsis">SYNOPSIS</a></li>
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<li><a href="#description">DESCRIPTION</a></li>
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<li><a href="#options">OPTIONS</a></li>
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<li><a href="#warnings">WARNINGS</a></li>
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<li><a href="#notes">NOTES</a></li>
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<li><a href="#bugs">BUGS</a></li>
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<li><a href="#see_also">SEE ALSO</a></li>
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<li><a href="#copyright">COPYRIGHT</a></li>
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</ul>
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<hr name="index" />
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</div>
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<!-- INDEX END -->
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<p>
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</p>
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<hr />
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<h1><a name="name">NAME</a></h1>
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<p>openssl-dhparam,
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dhparam - DH parameter manipulation and generation</p>
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<p>
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</p>
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<hr />
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<h1><a name="synopsis">SYNOPSIS</a></h1>
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<p><strong>openssl dhparam</strong>
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[<strong>-help</strong>]
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[<strong>-inform DER|PEM</strong>]
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[<strong>-outform DER|PEM</strong>]
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[<strong>-in</strong> <em>filename</em>]
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[<strong>-out</strong> <em>filename</em>]
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[<strong>-dsaparam</strong>]
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[<strong>-check</strong>]
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[<strong>-noout</strong>]
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[<strong>-text</strong>]
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[<strong>-C</strong>]
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[<strong>-2</strong>]
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[<strong>-5</strong>]
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[<strong>-rand file...</strong>]
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[<strong>-writerand file</strong>]
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[<strong>-engine id</strong>]
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[<em>numbits</em>]</p>
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<p>
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</p>
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<hr />
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<h1><a name="description">DESCRIPTION</a></h1>
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<p>This command is used to manipulate DH parameter files.</p>
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<p>
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</p>
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<hr />
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<h1><a name="options">OPTIONS</a></h1>
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<dl>
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<dt><strong><a name="help" class="item"><strong>-help</strong></a></strong></dt>
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<dd>
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<p>Print out a usage message.</p>
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</dd>
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<dt><strong><a name="inform_der_pem" class="item"><strong>-inform DER|PEM</strong></a></strong></dt>
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<dd>
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<p>This specifies the input format. The <strong>DER</strong> option uses an ASN1 DER encoded
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form compatible with the PKCS#3 DHparameter structure. The PEM form is the
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default format: it consists of the <strong>DER</strong> format base64 encoded with
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additional header and footer lines.</p>
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</dd>
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<dt><strong><a name="outform_der_pem" class="item"><strong>-outform DER|PEM</strong></a></strong></dt>
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<dd>
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<p>This specifies the output format, the options have the same meaning and default
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as the <strong>-inform</strong> option.</p>
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</dd>
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<dt><strong><a name="in_filename" class="item"><strong>-in</strong> <em>filename</em></a></strong></dt>
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<dd>
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<p>This specifies the input filename to read parameters from or standard input if
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this option is not specified.</p>
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</dd>
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<dt><strong><a name="out_filename" class="item"><strong>-out</strong> <em>filename</em></a></strong></dt>
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<dd>
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<p>This specifies the output filename parameters to. Standard output is used
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if this option is not present. The output filename should <strong>not</strong> be the same
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as the input filename.</p>
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</dd>
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<dt><strong><a name="dsaparam" class="item"><strong>-dsaparam</strong></a></strong></dt>
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<dd>
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<p>If this option is used, DSA rather than DH parameters are read or created;
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they are converted to DH format. Otherwise, "strong" primes (such
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that (p-1)/2 is also prime) will be used for DH parameter generation.</p>
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<p>DH parameter generation with the <strong>-dsaparam</strong> option is much faster,
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and the recommended exponent length is shorter, which makes DH key
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exchange more efficient. Beware that with such DSA-style DH
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parameters, a fresh DH key should be created for each use to
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avoid small-subgroup attacks that may be possible otherwise.</p>
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</dd>
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<dt><strong><a name="check" class="item"><strong>-check</strong></a></strong></dt>
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<dd>
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<p>Performs numerous checks to see if the supplied parameters are valid and
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displays a warning if not.</p>
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</dd>
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<dt><strong><a name="2_5" class="item"><strong>-2</strong>, <strong>-5</strong></a></strong></dt>
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<dd>
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<p>The generator to use, either 2 or 5. If present then the
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input file is ignored and parameters are generated instead. If not
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present but <strong>numbits</strong> is present, parameters are generated with the
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default generator 2.</p>
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</dd>
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<dt><strong><a name="rand_file" class="item"><strong>-rand file...</strong></a></strong></dt>
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<dd>
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<p>A file or files containing random data used to seed the random number
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generator.
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Multiple files can be specified separated by an OS-dependent character.
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The separator is <strong>;</strong> for MS-Windows, <strong>,</strong> for OpenVMS, and <strong>:</strong> for
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all others.</p>
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</dd>
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<dt><strong><a name="writerand_file" class="item">[<strong>-writerand file</strong>]</a></strong></dt>
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<dd>
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<p>Writes random data to the specified <em>file</em> upon exit.
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This can be used with a subsequent <strong>-rand</strong> flag.</p>
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</dd>
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<dt><strong><a name="numbits" class="item"><em>numbits</em></a></strong></dt>
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<dd>
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<p>This option specifies that a parameter set should be generated of size
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<em>numbits</em>. It must be the last option. If this option is present then
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the input file is ignored and parameters are generated instead. If
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this option is not present but a generator (<strong>-2</strong> or <strong>-5</strong>) is
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present, parameters are generated with a default length of 2048 bits.</p>
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</dd>
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<dt><strong><a name="noout" class="item"><strong>-noout</strong></a></strong></dt>
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<dd>
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<p>This option inhibits the output of the encoded version of the parameters.</p>
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</dd>
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<dt><strong><a name="text" class="item"><strong>-text</strong></a></strong></dt>
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<dd>
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<p>This option prints out the DH parameters in human readable form.</p>
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</dd>
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<dt><strong><a name="c" class="item"><strong>-C</strong></a></strong></dt>
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<dd>
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<p>This option converts the parameters into C code. The parameters can then
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be loaded by calling the <code>get_dhNNNN()</code> function.</p>
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</dd>
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<dt><strong><a name="engine_id" class="item"><strong>-engine id</strong></a></strong></dt>
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<dd>
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<p>Specifying an engine (by its unique <strong>id</strong> string) will cause <strong>dhparam</strong>
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to attempt to obtain a functional reference to the specified engine,
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thus initialising it if needed. The engine will then be set as the default
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for all available algorithms.</p>
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</dd>
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</dl>
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<p>
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</p>
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<hr />
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<h1><a name="warnings">WARNINGS</a></h1>
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<p>The program <strong>dhparam</strong> combines the functionality of the programs <strong>dh</strong> and
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<strong>gendh</strong> in previous versions of OpenSSL. The <strong>dh</strong> and <strong>gendh</strong>
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programs are retained for now but may have different purposes in future
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versions of OpenSSL.</p>
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<p>
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</p>
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<hr />
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<h1><a name="notes">NOTES</a></h1>
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<p>PEM format DH parameters use the header and footer lines:</p>
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<pre>
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-----BEGIN DH PARAMETERS-----
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-----END DH PARAMETERS-----</pre>
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<p>OpenSSL currently only supports the older PKCS#3 DH, not the newer X9.42
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DH.</p>
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<p>This program manipulates DH parameters not keys.</p>
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<p>
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</p>
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<hr />
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<h1><a name="bugs">BUGS</a></h1>
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<p>There should be a way to generate and manipulate DH keys.</p>
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<p>
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</p>
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<hr />
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<h1><a name="see_also">SEE ALSO</a></h1>
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<p><a href="#dsaparam">dsaparam(1)</a></p>
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<p>
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</p>
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<hr />
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<h1><a name="copyright">COPYRIGHT</a></h1>
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<p>Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved.</p>
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<p>Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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<a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>
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</body>
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</html>
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