1=pod 2{- OpenSSL::safe::output_do_not_edit_headers(); -} 3 4=head1 NAME 5 6openssl-dsaparam - DSA parameter manipulation and generation 7 8=head1 SYNOPSIS 9 10B<openssl dsaparam> 11[B<-help>] 12[B<-inform> B<DER>|B<PEM>] 13[B<-outform> B<DER>|B<PEM>] 14[B<-in> I<filename>] 15[B<-out> I<filename>] 16[B<-noout>] 17[B<-text>] 18[B<-genkey>] 19[B<-verbose>] 20[B<-quiet>] 21{- $OpenSSL::safe::opt_r_synopsis -} 22{- $OpenSSL::safe::opt_engine_synopsis -}{- $OpenSSL::safe::opt_provider_synopsis -} 23[I<numbits>] 24[I<numqbits>] 25 26=head1 DESCRIPTION 27 28This command is used to manipulate or generate DSA parameter files. 29 30DSA parameter generation can be a slow process and as a result the same set of 31DSA parameters is often used to generate several distinct keys. 32 33=head1 OPTIONS 34 35=over 4 36 37=item B<-help> 38 39Print out a usage message. 40 41=item B<-inform> B<DER>|B<PEM> 42 43The DSA parameters input format; unspecified by default. 44See L<openssl-format-options(1)> for details. 45 46=item B<-outform> B<DER>|B<PEM> 47 48The DSA parameters output format; the default is B<PEM>. 49See L<openssl-format-options(1)> for details. 50 51Parameters are a sequence of B<ASN.1 INTEGER>s: B<p>, B<q>, and B<g>. 52This is compatible with RFC 2459 B<DSS-Parms> structure. 53 54=item B<-in> I<filename> 55 56This specifies the input file to read parameters from or standard input if 57this option is not specified. If the I<numbits> parameter is included then 58this option will be ignored. 59 60=item B<-out> I<filename> 61 62This specifies the output file to write parameters to. Standard output is used 63if this option is not present. 64The output filename can be the same as the input filename, 65which leads to replacing the file contents. 66Note that file I/O is not atomic. The output file is truncated and then written. 67 68=item B<-noout> 69 70This option inhibits the output of the encoded version of the parameters. 71 72=item B<-text> 73 74This option prints out the DSA parameters in human readable form. 75 76=item B<-genkey> 77 78This option will generate a DSA either using the specified or generated 79parameters. 80 81 82=item B<-verbose> 83 84Print extra details about the operations being performed. 85 86=item B<-quiet> 87 88Print fewer details about the operations being performed, which may 89be handy during batch scripts and pipelines. 90 91{- $OpenSSL::safe::opt_r_item -} 92 93{- $OpenSSL::safe::opt_engine_item -} 94 95=item I<numbits> 96 97This optional argument specifies that a parameter set should be generated of 98size I<numbits>. If this argument is included then the input file (if any) is 99ignored. 100 101=item I<numqbits> 102 103This optional argument specifies that a parameter set should be generated with 104a subprime parameter q of size I<numqbits>. It must be the last argument. If 105this argument is included then the input file (if any) is ignored. 106 107{- $OpenSSL::safe::opt_provider_item -} 108 109=back 110 111=head1 SEE ALSO 112 113L<openssl(1)>, 114L<openssl-pkeyparam(1)>, 115L<openssl-gendsa(1)>, 116L<openssl-dsa(1)>, 117L<openssl-genrsa(1)>, 118L<openssl-rsa(1)> 119 120=head1 HISTORY 121 122The B<-engine> option was deprecated in OpenSSL 3.0. 123 124The B<-C> option was removed in OpenSSL 3.0. 125 126=head1 COPYRIGHT 127 128Copyright 2000-2023 The OpenSSL Project Authors. All Rights Reserved. 129 130Licensed under the Apache License 2.0 (the "License"). You may not use 131this file except in compliance with the License. You can obtain a copy 132in the file LICENSE in the source distribution or at 133L<https://www.openssl.org/source/license.html>. 134 135=cut 136
