| =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 |