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=pod
=head1 NAME
openssl-dsaparam,
dsaparam - DSA parameter manipulation and generation
=head1 SYNOPSIS
B<openssl dsaparam>
[B<-help>]
[B<-inform DER|PEM>]
[B<-outform DER|PEM>]
[B<-in filename>]
[B<-out filename>]
[B<-noout>]
[B<-text>]
[B<-C>]
[B<-rand file...>]
[B<-writerand file>]
[B<-genkey>]
[B<-engine id>]
[B<numbits>]
=head1 DESCRIPTION
This command is used to manipulate or generate DSA parameter files.
=head1 OPTIONS
=over 4
=item B<-help>
Print out a usage message.
=item B<-inform DER|PEM>
This specifies the input format. The B<DER> option uses an ASN1 DER encoded
form compatible with RFC2459 (PKIX) DSS-Parms that is a SEQUENCE consisting
of p, q and g respectively. The PEM form is the default format: it consists
of the B<DER> format base64 encoded with additional header and footer lines.
=item B<-outform DER|PEM>
This specifies the output format, the options have the same meaning and default
as the B<-inform> option.
=item B<-in filename>
This specifies the input filename to read parameters from or standard input if
this option is not specified. If the B<numbits> parameter is included then
this option will be ignored.
=item B<-out filename>
This specifies the output filename parameters to. Standard output is used
if this option is not present. The output filename should B<not> be the same
as the input filename.
=item B<-noout>
This option inhibits the output of the encoded version of the parameters.
=item B<-text>
This option prints out the DSA parameters in human readable form.
=item B<-C>
This option converts the parameters into C code. The parameters can then
be loaded by calling the get_dsaXXX() function.
=item B<-genkey>
This option will generate a DSA either using the specified or generated
parameters.
=item B<-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 B<;> for MS-Windows, B<,> for OpenVMS, and B<:> for
all others.
=item [B<-writerand file>]
Writes random data to the specified I<file> upon exit.
This can be used with a subsequent B<-rand> flag.
=item B<numbits>
This option specifies that a parameter set should be generated of size
B<numbits>. It must be the last option. If this option is included then
the input file (if any) is ignored.
=item B<-engine id>
Specifying an engine (by its unique B<id> string) will cause B<dsaparam>
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.
=back
=head1 NOTES
PEM format DSA parameters use the header and footer lines:
-----BEGIN DSA PARAMETERS-----
-----END DSA PARAMETERS-----
DSA parameter generation is a slow process and as a result the same set of
DSA parameters is often used to generate several distinct keys.
=head1 SEE ALSO
L<gendsa(1)>, L<dsa(1)>, L<genrsa(1)>,
L<rsa(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
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