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35a810bb1d
Almost all OpenSSL commands are in reality 'openssl cmd', so make sure
they are refered to like that and not just as the sub-command.
Self-references are avoided as much as is possible, and replaced with
"this command". In some cases, we even avoid that with a slight
rewrite of the sentence or paragrah they were in. However, in the few
cases where a self-reference is still admissible, they are done in
bold, i.e. openssl-speed.pod references itself like this:
B<openssl speed>
References to other commands are done as manual links, i.e. CA.pl.pod
references 'openssl req' like this: L<openssl-req(1)>
Some commands are examples rather than references; we enclose those in
C<>.
While we are it, we abolish "utility", replacing it with "command", or
remove it entirely in some cases.
Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/10065)
170 lines
4.6 KiB
Plaintext
170 lines
4.6 KiB
Plaintext
=pod
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=head1 NAME
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openssl-dhparam - DH parameter manipulation and generation
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=head1 SYNOPSIS
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B<openssl dhparam>
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[B<-help>]
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[B<-inform> B<DER>|B<PEM>]
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[B<-outform> B<DER>|B<PEM>]
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[B<-in> I<filename>]
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[B<-out> I<filename>]
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[B<-dsaparam>]
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[B<-check>]
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[B<-noout>]
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[B<-text>]
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[B<-C>]
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[B<-2>]
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[B<-3>]
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[B<-5>]
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[B<-rand> I<files>]
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[B<-writerand> I<file>]
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[B<-engine> I<id>]
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[I<numbits>]
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=for comment ifdef dsaparam engine
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=head1 DESCRIPTION
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This command is used to manipulate DH parameter files.
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=head1 OPTIONS
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=over 4
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=item B<-help>
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Print out a usage message.
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=item B<-inform> B<DER>|B<PEM>
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This specifies the input format. The B<DER> option uses an ASN1 DER encoded
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form compatible with the PKCS#3 DHparameter structure. The PEM form is the
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default format: it consists of the B<DER> format base64 encoded with
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additional header and footer lines.
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=item B<-outform> B<DER>|B<PEM>
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This specifies the output format, the options have the same meaning and default
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as the B<-inform> option.
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=item B<-in> I<filename>
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This specifies the input filename to read parameters from or standard input if
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this option is not specified.
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=item B<-out> I<filename>
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This specifies the output filename parameters to. Standard output is used
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if this option is not present. The output filename should B<not> be the same
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as the input filename.
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=item B<-dsaparam>
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If this option is used, DSA rather than DH parameters are read or created;
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they are converted to DH format. Otherwise, "strong" primes (such
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that (p-1)/2 is also prime) will be used for DH parameter generation.
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DH parameter generation with the B<-dsaparam> option is much faster,
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and the recommended exponent length is shorter, which makes DH key
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exchange more efficient. Beware that with such DSA-style DH
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parameters, a fresh DH key should be created for each use to
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avoid small-subgroup attacks that may be possible otherwise.
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=item B<-check>
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Performs numerous checks to see if the supplied parameters are valid and
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displays a warning if not.
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=item B<-2>, B<-3>, B<-5>
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The generator to use, either 2, 3 or 5. If present then the
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input file is ignored and parameters are generated instead. If not
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present but I<numbits> is present, parameters are generated with the
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default generator 2.
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=item B<-rand> I<files>
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The files containing random data used to seed the random number generator.
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Multiple files can be specified separated by an OS-dependent character.
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The separator is B<;> for MS-Windows, B<,> for OpenVMS, and B<:> for
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all others.
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=item B<-writerand> I<file>
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Writes random data to the specified I<file> upon exit.
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This can be used with a subsequent B<-rand> flag.
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=item I<numbits>
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This option specifies that a parameter set should be generated of size
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I<numbits>. It must be the last option. If this option is present then
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the input file is ignored and parameters are generated instead. If
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this option is not present but a generator (B<-2>, B<-3> or B<-5>) is
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present, parameters are generated with a default length of 2048 bits.
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The minimim length is 512 bits. The maximum length is 10000 bits.
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=item B<-noout>
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This option inhibits the output of the encoded version of the parameters.
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=item B<-text>
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This option prints out the DH parameters in human readable form.
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=item B<-C>
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This option converts the parameters into C code. The parameters can then
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be loaded by calling the get_dhNNNN() function.
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=item B<-engine> I<id>
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Specifying an engine (by its unique I<id> string) will cause B<dhparam>
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to attempt to obtain a functional reference to the specified engine,
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thus initialising it if needed. The engine will then be set as the default
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for all available algorithms.
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=back
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=head1 WARNINGS
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This command combines the functionality of the L<openssl-dh(1)> and the
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L<openssl-gendh(1)> commands in previous OpenSSL versions.
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The L<openssl-dh(1)> and L<openssl-gendh(1)> commands are retained for now but
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may have different purposes in future versions of OpenSSL.
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=head1 NOTES
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PEM format DH parameters use the header and footer lines:
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-----BEGIN DH PARAMETERS-----
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-----END DH PARAMETERS-----
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OpenSSL currently only supports the older PKCS#3 DH, not the newer X9.42
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DH.
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This program manipulates DH parameters not keys.
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=head1 BUGS
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There should be a way to generate and manipulate DH keys.
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=head1 SEE ALSO
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L<openssl(1)>,
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L<openssl-dsaparam(1)>
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=head1 COPYRIGHT
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Copyright 2000-2019 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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