doc/man1/openssl-dsaparam.pod

   1 =pod
   2
   3 =head1 NAME
   4
   5 openssl-dsaparam - DSA parameter manipulation and generation
   6
   7 =head1 SYNOPSIS
   8
   9 B<openssl dsaparam>
  10 [B<-help>]
  11 [B<-inform DER|PEM>]
  12 [B<-outform DER|PEM>]
  13 [B<-in filename>]
  14 [B<-out filename>]
  15 [B<-noout>]
  16 [B<-text>]
  17 [B<-C>]
  18 [B<-rand file...>]
  19 [B<-writerand file>]
  20 [B<-genkey>]
  21 [B<-engine id>]
  22 [B<-verbose>]
  23 [B<numbits>]
  24
  25 =head1 DESCRIPTION
  26
  27 This command is used to manipulate or generate DSA parameter files.
  28
  29 =head1 OPTIONS
  30
  31 =over 4
  32
  33 =item B<-help>
  34
  35 Print out a usage message.
  36
  37 =item B<-inform DER|PEM>
  38
  39 This specifies the input format. The B<DER> option uses an ASN1 DER encoded
  40 form compatible with RFC2459 (PKIX) DSS-Parms that is a SEQUENCE consisting
  41 of p, q and g respectively. The PEM form is the default format: it consists
  42 of the B<DER> format base64 encoded with additional header and footer lines.
  43
  44 =item B<-outform DER|PEM>
  45
  46 This specifies the output format, the options have the same meaning and default
  47 as the B<-inform> option.
  48
  49 =item B<-in filename>
  50
  51 This specifies the input filename to read parameters from or standard input if
  52 this option is not specified. If the B<numbits> parameter is included then
  53 this option will be ignored.
  54
  55 =item B<-out filename>
  56
  57 This specifies the output filename parameters to. Standard output is used
  58 if this option is not present. The output filename should B<not> be the same
  59 as the input filename.
  60
  61 =item B<-noout>
  62
  63 This option inhibits the output of the encoded version of the parameters.
  64
  65 =item B<-text>
  66
  67 This option prints out the DSA parameters in human readable form.
  68
  69 =item B<-C>
  70
  71 This option converts the parameters into C code. The parameters can then
  72 be loaded by calling the get_dsaXXX() function.
  73
  74 =item B<-genkey>
  75
  76 This option will generate a DSA either using the specified or generated
  77 parameters.
  78
  79 =item B<-rand file...>
  80
  81 A file or files containing random data used to seed the random number
  82 generator.
  83 Multiple files can be specified separated by an OS-dependent character.
  84 The separator is B<;> for MS-Windows, B<,> for OpenVMS, and B<:> for
  85 all others.
  86
  87 =item [B<-writerand file>]
  88
  89 Writes random data to the specified I<file> upon exit.
  90 This can be used with a subsequent B<-rand> flag.
  91
  92 =item B<-engine id>
  93
  94 Specifying an engine (by its unique B<id> string) will cause B<dsaparam>
  95 to attempt to obtain a functional reference to the specified engine,
  96 thus initialising it if needed. The engine will then be set as the default
  97 for all available algorithms.
  98
  99 =item B<-verbose>
 100
 101 Print extra details about the operations being performed.
 102
 103 =item B<numbits>
 104
 105 This option specifies that a parameter set should be generated of size
 106 B<numbits>. It must be the last option. If this option is included then
 107 the input file (if any) is ignored.
 108
 109 =back
 110
 111 =head1 NOTES
 112
 113 PEM format DSA parameters use the header and footer lines:
 114
 115  -----BEGIN DSA PARAMETERS-----
 116  -----END DSA PARAMETERS-----
 117
 118 DSA parameter generation is a slow process and as a result the same set of
 119 DSA parameters is often used to generate several distinct keys.
 120
 121 =head1 SEE ALSO
 122
 123 L<openssl(1)>,
 124 L<openssl-gendsa(1)>,
 125 L<openssl-dsa(1)>,
 126 L<openssl-genrsa(1)>,
 127 L<openssl-rsa(1)>
 128
 129 =head1 COPYRIGHT
 130
 131 Copyright 2000-2019 The OpenSSL Project Authors. All Rights Reserved.
 132
 133 Licensed under the Apache License 2.0 (the "License").  You may not use
 134 this file except in compliance with the License.  You can obtain a copy
 135 in the file LICENSE in the source distribution or at
 136 L<https://www.openssl.org/source/license.html>.
 137
 138 =cut