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