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+=pod
+
+=head1 NAME
+
+openssl-genrsa,
+genrsa - generate an RSA private key
+
+=head1 SYNOPSIS
+
+B<openssl> B<genrsa>
+[B<-help>]
+[B<-out filename>]
+[B<-passout arg>]
+[B<-aes128>]
+[B<-aes192>]
+[B<-aes256>]
+[B<-aria128>]
+[B<-aria192>]
+[B<-aria256>]
+[B<-camellia128>]
+[B<-camellia192>]
+[B<-camellia256>]
+[B<-des>]
+[B<-des3>]
+[B<-idea>]
+[B<-f4>]
+[B<-3>]
+[B<-rand file(s)>]
+[B<-engine id>]
+[B<numbits>]
+
+=head1 DESCRIPTION
+
+The B<genrsa> command generates an RSA private key.
+
+=head1 OPTIONS
+
+=over 4
+
+=item B<-help>
+
+Print out a usage message.
+
+=item B<-out filename>
+
+Output the key to the specified file. If this argument is not specified then
+standard output is used.
+
+=item B<-passout arg>
+
+the output file password source. For more information about the format of B<arg>
+see the B<PASS PHRASE ARGUMENTS> section in L<openssl(1)>.
+
+=item B<-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 B<-passout> argument.
+
+=item B<-F4|-3>
+
+the public exponent to use, either 65537 or 3. The default is 65537.
+
+=item B<-rand file(s)>
+
+a file or files containing random data used to seed the random number
+generator, or an EGD socket (see L<RAND_egd(3)>).
+Multiple files can be specified separated by an OS-dependent character.
+The separator is B<;> for MS-Windows, B<,> for OpenVMS, and B<:> for
+all others.
+
+=item B<-engine id>
+
+specifying an engine (by its unique B<id> string) will cause B<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.
+
+=item B<numbits>
+
+the size of the private key to generate in bits. This must be the last option
+specified. The default is 2048.
+
+=back
+
+=head1 NOTES
+
+RSA 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 B<.> represents each number which
+has passed an initial sieve test, B<+> 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).
+
+Because key generation is a random process the time taken to generate a key
+may vary somewhat.
+
+=head1 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).
+
+=head1 SEE ALSO
+
+L<gendsa(1)>
+
+=head1 COPYRIGHT
+
+Copyright 2000-2017 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
+L<https://www.openssl.org/source/license.html>.
+
+=cut