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openssl-genrsa.1
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" openssl\-genrsa, genrsa \- generate an RSA private key .SH "SYNOPSIS" .IX Header "SYNOPSIS" \&\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(s)\fR] [\fB\-engine id\fR] [\fBnumbits\fR] .SH "DESCRIPTION" .IX Header "DESCRIPTION" The \fBgenrsa\fR command generates an \s-1RSA\s0 private key. .SH "OPTIONS" .IX Header "OPTIONS" .IP "\fB\-help\fR" 4 .IX Item "-help" Print out a usage message. .IP "\fB\-out filename\fR" 4 .IX Item "-out filename" Output the key to the specified file. If this argument is not specified then standard output is used. .IP "\fB\-passout arg\fR" 4 .IX Item "-passout arg" the output file password source. For more information about the format of \fBarg\fR see the \fB\s-1PASS PHRASE ARGUMENTS\s0\fR section in \fBopenssl\fR\|(1). .IP "\fB\-aes128|\-aes192|\-aes256|\-aria128|\-aria192|\-aria256|\-camellia128|\-camellia192|\-camellia256|\-des|\-des3|\-idea\fR" 4 .IX Item "-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 \fB\-passout\fR argument. .IP "\fB\-F4|\-3\fR" 4 .IX Item "-F4|-3" the public exponent to use, either 65537 or 3. The default is 65537. .IP "\fB\-rand file(s)\fR" 4 .IX Item "-rand file(s)" a file or files containing random data used to seed the random number generator, or an \s-1EGD\s0 socket (see \fBRAND_egd\fR\|(3)). 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 "\fB\-engine id\fR" 4 .IX Item "-engine id" 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 "\fBnumbits\fR" 4 .IX Item "numbits" the size of the private key to generate in bits. This must be the last option specified. The default is 2048. .SH "NOTES" .IX Header "NOTES" \&\s-1RSA\s0 private key generation essentially involves the generation of two 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. 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. .SH "BUGS" .IX Header "BUGS" A quirk of the prime generation algorithm is that it cannot generate small primes. Therefore the number of bits should not be less that 64. For typical private keys this will not matter because for security reasons they will be much larger (typically 1024 bits). .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBgendsa\fR\|(1) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2000\-2017 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \*(L"License\*(R"). 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 <https://www.openssl.org/source/license.html>.
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