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GENRSA(1SSL) OpenSSL GENRSA(1SSL)
NAME
openssl-genrsa, genrsa - generate an RSA private key
SYNOPSIS
openssl genrsa [-help] [-out filename] [-passout arg] [-aes128] [-aes192] [-aes256]
[-aria128] [-aria192] [-aria256] [-camellia128] [-camellia192] [-camellia256] [-des]
[-des3] [-idea] [-f4] [-3] [-rand file...] [-writerand file] [-engine id] [-primes num]
[numbits]
DESCRIPTION
The genrsa command generates an RSA private key.
OPTIONS
-help
Print out a usage message.
-out filename
Output the key to the specified file. If this argument is not specified then standard
output is used.
-passout arg
The output file password source. For more information about the format of arg see the
PASS PHRASE ARGUMENTS section in openssl(1).
-aes128, -aes192, -aes256, -aria128, -aria192, -aria256, -camellia128, -camellia192,
-camellia256, -des, -des3, -idea
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 -passout argument.
-F4|-3
The public exponent to use, either 65537 or 3. The default is 65537.
-rand file...
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 ; for MS-Windows, , for OpenVMS, and : for all others.
[-writerand file]
Writes random data to the specified file upon exit. This can be used with a
subsequent -rand flag.
-engine id
Specifying an engine (by its unique id string) will cause genrsa 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.
-primes num
Specify the number of primes to use while generating the RSA key. The num parameter
must be a positive integer that is greater than 1 and less than 16. If num is greater
than 2, then the generated key is called a 'multi-prime' RSA key, which is defined in
RFC 8017.
numbits
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.
NOTES
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 . represents each number which has passed an initial sieve
test, + means a number has passed a single round of the Miller-Rabin primality test, *
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).
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.
SEE ALSO
gendsa(1)
COPYRIGHT
Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.
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 <https://www.openssl.org/source/license.html>.
1.1.1f 2024-02-16 GENRSA(1SSL)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
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Under GNU General Public License
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