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      1 =pod
      2 
      3 =head1 NAME
      4 
      5 openssl-dsaparam,
      6 dsaparam - DSA parameter manipulation and generation
      7 
      8 =head1 SYNOPSIS
      9 
     10 B<openssl dsaparam>
     11 [B<-help>]
     12 [B<-inform DER|PEM>]
     13 [B<-outform DER|PEM>]
     14 [B<-in filename>]
     15 [B<-out filename>]
     16 [B<-noout>]
     17 [B<-text>]
     18 [B<-C>]
     19 [B<-rand file...>]
     20 [B<-writerand file>]
     21 [B<-genkey>]
     22 [B<-engine id>]
     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<numbits>
     93 
     94 This option specifies that a parameter set should be generated of size
     95 B<numbits>. It must be the last option. If this option is included then
     96 the input file (if any) is ignored.
     97 
     98 =item B<-engine id>
     99 
    100 Specifying an engine (by its unique B<id> string) will cause B<dsaparam>
    101 to attempt to obtain a functional reference to the specified engine,
    102 thus initialising it if needed. The engine will then be set as the default
    103 for all available algorithms.
    104 
    105 =back
    106 
    107 =head1 NOTES
    108 
    109 PEM format DSA parameters use the header and footer lines:
    110 
    111  -----BEGIN DSA PARAMETERS-----
    112  -----END DSA PARAMETERS-----
    113 
    114 DSA parameter generation is a slow process and as a result the same set of
    115 DSA parameters is often used to generate several distinct keys.
    116 
    117 =head1 SEE ALSO
    118 
    119 L<gendsa(1)>, L<dsa(1)>, L<genrsa(1)>,
    120 L<rsa(1)>
    121 
    122 =head1 COPYRIGHT
    123 
    124 Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved.
    125 
    126 Licensed under the OpenSSL license (the "License").  You may not use
    127 this file except in compliance with the License.  You can obtain a copy
    128 in the file LICENSE in the source distribution or at
    129 L<https://www.openssl.org/source/license.html>.
    130 
    131 =cut
    132