97 lines
2.5 KiB
Plaintext
97 lines
2.5 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
genrsa - generate an RSA private key
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
B<openssl> B<genrsa>
|
|
[B<-out filename>]
|
|
[B<-passout arg>]
|
|
[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<-out filename>
|
|
|
|
the output filename. 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)|openssl(1)>.
|
|
|
|
=item B<-des|-des3|-idea>
|
|
|
|
These options encrypt the private key with the DES, triple DES, or the
|
|
IDEA ciphers respectively 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)|RAND_egd(3)>).
|
|
Multiple files can be specified separated by a 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 it's unique B<id> string) will cause B<req>
|
|
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 512.
|
|
|
|
=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)|gendsa(1)>
|
|
|
|
=cut
|
|
|