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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>genrsa</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="#notes">NOTES</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-genrsa, genrsa - generate an RSA private key</p> <p> </p> <hr /> <h1><a name="synopsis">SYNOPSIS</a></h1> <p><strong>openssl</strong> <strong>genrsa</strong> [<strong>-help</strong>] [<strong>-out filename</strong>] [<strong>-passout arg</strong>] [<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>] [<strong>-f4</strong>] [<strong>-3</strong>] [<strong>-rand file...</strong>] [<strong>-writerand file</strong>] [<strong>-engine id</strong>] [<strong>-primes num</strong>] [<strong>numbits</strong>]</p> <p> </p> <hr /> <h1><a name="description">DESCRIPTION</a></h1> <p>The <strong>genrsa</strong> command generates an RSA private key.</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="out_filename" class="item"><strong>-out filename</strong></a></strong></dt> <dd> <p>Output the key to the specified file. If this argument is not specified then standard output is used.</p> </dd> <dt><strong><a name="passout_arg" class="item"><strong>-passout arg</strong></a></strong></dt> <dd> <p>The output file password source. For more information about the format of <strong>arg</strong> see <em>openssl(1)/Pass Phrase Options</em>.</p> </dd> <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> <dd> <p>These options encrypt the private key with specified cipher before outputting it. If none of these options is specified no encryption is used. If encryption is used a pass phrase is prompted for if it is not supplied via the <strong>-passout</strong> argument.</p> </dd> <dt><strong><a name="f4_3" class="item"><strong>-F4|-3</strong></a></strong></dt> <dd> <p>The public exponent to use, either 65537 or 3. The default is 65537.</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="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>genrsa</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> <dt><strong><a name="primes_num" class="item"><strong>-primes num</strong></a></strong></dt> <dd> <p>Specify the number of primes to use while generating the RSA key. The <strong>num</strong> parameter must be a positive integer that is greater than 1 and less than 16. If <strong>num</strong> is greater than 2, then the generated key is called a 'multi-prime' RSA key, which is defined in <a href="http://www.ietf.org/rfc/rfc8017.txt" class="rfc">RFC 8017</a>.</p> </dd> <dt><strong><a name="numbits" class="item"><strong>numbits</strong></a></strong></dt> <dd> <p>The size of the private key to generate in bits. This must be the last option specified. The default is 2048 and values less than 512 are not allowed.</p> </dd> </dl> <p> </p> <hr /> <h1><a name="notes">NOTES</a></h1> <p>RSA private key generation essentially involves the generation of two or more prime numbers. When generating a private key various symbols will be output to indicate the progress of the generation. A <strong>.</strong> represents each number which has passed an initial sieve test, <strong>+</strong> means a number has passed a single round of the Miller-Rabin primality test, <strong>*</strong> means the current prime starts a regenerating progress due to some failed tests. A newline means that the number has passed all the prime tests (the actual number depends on the key size).</p> <p>Because key generation is a random process the time taken to generate a key may vary somewhat. But in general, more primes lead to less generation time of a key.</p> <p> </p> <hr /> <h1><a name="see_also">SEE ALSO</a></h1> <p><em>gendsa(1)</em></p> <p> </p> <hr /> <h1><a name="copyright">COPYRIGHT</a></h1> <p>Copyright 2000-2021 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>