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7477c83e15
Reviewed-by: Andy Polyakov <appro@openssl.org> Reviewed-by: Rich Salz <rsalz@openssl.org> (Merged from https://github.com/openssl/openssl/pull/4122)
131 lines
3.2 KiB
Plaintext
131 lines
3.2 KiB
Plaintext
=pod
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=head1 NAME
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dsaparam - DSA parameter manipulation and generation
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=head1 SYNOPSIS
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B<openssl dsaparam>
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[B<-help>]
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[B<-inform DER|PEM>]
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[B<-outform DER|PEM>]
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[B<-in filename>]
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[B<-out filename>]
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[B<-noout>]
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[B<-text>]
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[B<-C>]
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[B<-rand file...>]
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[B<-writerand file>]
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[B<-genkey>]
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[B<-engine id>]
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[B<numbits>]
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=head1 DESCRIPTION
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This command is used to manipulate or generate DSA 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 DER|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 RFC2459 (PKIX) DSS-Parms that is a SEQUENCE consisting
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of p, q and g respectively. The PEM form is the default format: it consists
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of the B<DER> format base64 encoded with additional header and footer lines.
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=item B<-outform DER|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 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. If the B<numbits> parameter is included then
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this option will be ignored.
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=item B<-out 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<-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 DSA 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_dsaXXX() function.
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=item B<-genkey>
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This option will generate a DSA either using the specified or generated
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parameters.
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=item B<-rand file...>
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A file or files containing random data used to seed the random number
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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 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 B<numbits>
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This option specifies that a parameter set should be generated of size
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B<numbits>. It must be the last option. If this option is included then
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the input file (if any) is ignored.
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=item B<-engine id>
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Specifying an engine (by its unique B<id> string) will cause B<dsaparam>
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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 NOTES
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PEM format DSA parameters use the header and footer lines:
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-----BEGIN DSA PARAMETERS-----
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-----END DSA PARAMETERS-----
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DSA parameter generation is a slow process and as a result the same set of
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DSA parameters is often used to generate several distinct keys.
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=head1 SEE ALSO
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L<gendsa(1)>, L<dsa(1)>, L<genrsa(1)>,
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L<rsa(1)>
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=head1 COPYRIGHT
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Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (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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