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137 lines
3.6 KiB
Plaintext
137 lines
3.6 KiB
Plaintext
=pod
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{- OpenSSL::safe::output_do_not_edit_headers(); -}
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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<-2>]
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[B<-3>]
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[B<-5>]
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{- $OpenSSL::safe::opt_engine_synopsis -}{- $OpenSSL::safe::opt_r_synopsis -}
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{- $OpenSSL::safe::opt_provider_synopsis -}
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[I<numbits>]
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=head1 DESCRIPTION
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This command is used to manipulate DH parameter files.
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See L<openssl-genpkey(1)/EXAMPLES> for examples on how to generate
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a key using a named safe prime group without generating intermediate
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parameters.
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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>, B<-outform> B<DER>|B<PEM>
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The input format and output format; the default is B<PEM>.
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The object is compatible with the PKCS#3 B<DHparameter> structure.
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See L<openssl-format-options(1)> for details.
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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 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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{- $OpenSSL::safe::opt_engine_item -}
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{- $OpenSSL::safe::opt_r_item -}
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{- $OpenSSL::safe::opt_provider_item -}
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=back
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=head1 NOTES
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This command replaces the B<dh> and B<gendh> commands of previous
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releases.
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=head1 SEE ALSO
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L<openssl(1)>,
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L<openssl-pkeyparam(1)>,
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L<openssl-dsaparam(1)>,
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L<openssl-genpkey(1)>.
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=head1 HISTORY
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The B<-engine> option was deprecated in OpenSSL 3.0.
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The B<-C> option was removed in OpenSSL 3.0.
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=head1 COPYRIGHT
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Copyright 2000-2021 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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