175 lines
6.4 KiB
HTML
175 lines
6.4 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>genrsa</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="#notes">NOTES</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-genrsa,
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genrsa - generate an RSA private key</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</strong> <strong>genrsa</strong>
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[<strong>-help</strong>]
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[<strong>-out filename</strong>]
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[<strong>-passout arg</strong>]
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[<strong>-aes128</strong>]
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[<strong>-aes192</strong>]
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[<strong>-aes256</strong>]
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[<strong>-aria128</strong>]
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[<strong>-aria192</strong>]
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[<strong>-aria256</strong>]
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[<strong>-camellia128</strong>]
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[<strong>-camellia192</strong>]
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[<strong>-camellia256</strong>]
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[<strong>-des</strong>]
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[<strong>-des3</strong>]
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[<strong>-idea</strong>]
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[<strong>-f4</strong>]
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[<strong>-3</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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[<strong>-primes num</strong>]
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[<strong>numbits</strong>]</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>The <strong>genrsa</strong> command generates an RSA private key.</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="out_filename" class="item"><strong>-out filename</strong></a></strong></dt>
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<dd>
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<p>Output the key to the specified file. If this argument is not specified then
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standard output is used.</p>
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</dd>
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<dt><strong><a name="passout_arg" class="item"><strong>-passout arg</strong></a></strong></dt>
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<dd>
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<p>The output file password source. For more information about the format
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of <strong>arg</strong> see the <strong>PASS PHRASE ARGUMENTS</strong> section in <em>openssl(1)</em>.</p>
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</dd>
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<dt><strong><a name="aes128_aes192_aes256_aria128_aria192_aria256_camellia128_camellia192_camellia256_des_des3_idea" class="item"><strong>-aes128</strong>, <strong>-aes192</strong>, <strong>-aes256</strong>, <strong>-aria128</strong>, <strong>-aria192</strong>, <strong>-aria256</strong>, <strong>-camellia128</strong>, <strong>-camellia192</strong>, <strong>-camellia256</strong>, <strong>-des</strong>, <strong>-des3</strong>, <strong>-idea</strong></a></strong></dt>
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<dd>
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<p>These options encrypt the private key with specified
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cipher before outputting it. If none of these options is
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specified no encryption is used. If encryption is used a pass phrase is prompted
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for if it is not supplied via the <strong>-passout</strong> argument.</p>
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</dd>
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<dt><strong><a name="f4_3" class="item"><strong>-F4|-3</strong></a></strong></dt>
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<dd>
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<p>The public exponent to use, either 65537 or 3. The default is 65537.</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="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>genrsa</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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<dt><strong><a name="primes_num" class="item"><strong>-primes num</strong></a></strong></dt>
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<dd>
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<p>Specify the number of primes to use while generating the RSA key. The <strong>num</strong>
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parameter must be a positive integer that is greater than 1 and less than 16.
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If <strong>num</strong> is greater than 2, then the generated key is called a 'multi-prime'
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RSA key, which is defined in <a href="http://www.ietf.org/rfc/rfc8017.txt" class="rfc">RFC 8017</a>.</p>
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</dd>
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<dt><strong><a name="numbits" class="item"><strong>numbits</strong></a></strong></dt>
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<dd>
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<p>The size of the private key to generate in bits. This must be the last option
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specified. The default is 2048 and values less than 512 are not allowed.</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="notes">NOTES</a></h1>
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<p>RSA private key generation essentially involves the generation of two or more
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prime numbers. When generating a private key various symbols will be output to
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indicate the progress of the generation. A <strong>.</strong> represents each number which
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has passed an initial sieve test, <strong>+</strong> means a number has passed a single
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round of the Miller-Rabin primality test, <strong>*</strong> means the current prime starts
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a regenerating progress due to some failed tests. A newline means that the number
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has passed all the prime tests (the actual number depends on the key size).</p>
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<p>Because key generation is a random process the time taken to generate a key
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may vary somewhat. But in general, more primes lead to less generation time
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of a key.</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><em>gendsa(1)</em></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 2000-2018 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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