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.IX Title &quot;GENRSA 1&quot;
.TH GENRSA 1 &quot;2023-09-11&quot; &quot;1.1.1w&quot; &quot;OpenSSL&quot;
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.SH &quot;NAME&quot;
openssl\-genrsa, genrsa \- generate an RSA private key
.SH &quot;SYNOPSIS&quot;
.IX Header &quot;SYNOPSIS&quot;
\&amp;\fBopenssl\fR \fBgenrsa\fR
[\fB\-help\fR]
[\fB\-out filename\fR]
[\fB\-passout arg\fR]
[\fB\-aes128\fR]
[\fB\-aes192\fR]
[\fB\-aes256\fR]
[\fB\-aria128\fR]
[\fB\-aria192\fR]
[\fB\-aria256\fR]
[\fB\-camellia128\fR]
[\fB\-camellia192\fR]
[\fB\-camellia256\fR]
[\fB\-des\fR]
[\fB\-des3\fR]
[\fB\-idea\fR]
[\fB\-f4\fR]
[\fB\-3\fR]
[\fB\-rand file...\fR]
[\fB\-writerand file\fR]
[\fB\-engine id\fR]
[\fB\-primes num\fR]
[\fBnumbits\fR]
.SH &quot;DESCRIPTION&quot;
.IX Header &quot;DESCRIPTION&quot;
The \fBgenrsa\fR command generates an \s-1RSA\s0 private key.
.SH &quot;OPTIONS&quot;
.IX Header &quot;OPTIONS&quot;
.IP &quot;\fB\-help\fR&quot; 4
.IX Item &quot;-help&quot;
Print out a usage message.
.IP &quot;\fB\-out filename\fR&quot; 4
.IX Item &quot;-out filename&quot;
Output the key to the specified file. If this argument is not specified then
standard output is used.
.IP &quot;\fB\-passout arg\fR&quot; 4
.IX Item &quot;-passout arg&quot;
The output file password source. For more information about the format
of \fBarg\fR see \*(L&quot;Pass Phrase Options\*(R&quot; in \fBopenssl\fR\|(1).
.IP &quot;\fB\-aes128\fR, \fB\-aes192\fR, \fB\-aes256\fR, \fB\-aria128\fR, \fB\-aria192\fR, \fB\-aria256\fR, \fB\-camellia128\fR, \fB\-camellia192\fR, \fB\-camellia256\fR, \fB\-des\fR, \fB\-des3\fR, \fB\-idea\fR&quot; 4
.IX Item &quot;-aes128, -aes192, -aes256, -aria128, -aria192, -aria256, -camellia128, -camellia192, -camellia256, -des, -des3, -idea&quot;
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 \fB\-passout\fR argument.
.IP &quot;\fB\-F4|\-3\fR&quot; 4
.IX Item &quot;-F4|-3&quot;
The public exponent to use, either 65537 or 3. The default is 65537.
.IP &quot;\fB\-rand file...\fR&quot; 4
.IX Item &quot;-rand file...&quot;
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 \fB;\fR for MS-Windows, \fB,\fR for OpenVMS, and \fB:\fR for
all others.
.IP &quot;[\fB\-writerand file\fR]&quot; 4
.IX Item &quot;[-writerand file]&quot;
Writes random data to the specified \fIfile\fR upon exit.
This can be used with a subsequent \fB\-rand\fR flag.
.IP &quot;\fB\-engine id\fR&quot; 4
.IX Item &quot;-engine id&quot;
Specifying an engine (by its unique \fBid\fR string) will cause \fBgenrsa\fR
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.
.IP &quot;\fB\-primes num\fR&quot; 4
.IX Item &quot;-primes num&quot;
Specify the number of primes to use while generating the \s-1RSA\s0 key. The \fBnum\fR
parameter must be a positive integer that is greater than 1 and less than 16.
If \fBnum\fR is greater than 2, then the generated key is called a 'multi\-prime'
\&amp;\s-1RSA\s0 key, which is defined in \s-1RFC 8017.\s0
.IP &quot;\fBnumbits\fR&quot; 4
.IX Item &quot;numbits&quot;
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.
.SH &quot;NOTES&quot;
.IX Header &quot;NOTES&quot;
\&amp;\s-1RSA\s0 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 \fB.\fR represents each number which
has passed an initial sieve test, \fB+\fR means a number has passed a single
round of the Miller-Rabin primality test, \fB*\fR 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).
.PP
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.
.SH &quot;SEE ALSO&quot;
.IX Header &quot;SEE ALSO&quot;
\&amp;\fBgendsa\fR\|(1)
.SH &quot;COPYRIGHT&quot;
.IX Header &quot;COPYRIGHT&quot;
Copyright 2000\-2021 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L&quot;License\*(R&quot;).  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
&lt;https://www.openssl.org/source/license.html&gt;.
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