1DSAPARAM(1)                         OpenSSL                        DSAPARAM(1)
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NAME

6       openssl-dsaparam, dsaparam - DSA parameter manipulation and generation
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SYNOPSIS

9       openssl dsaparam [-help] [-inform DER|PEM] [-outform DER|PEM] [-in
10       filename] [-out filename] [-noout] [-text] [-C] [-rand file...]
11       [-writerand file] [-genkey] [-engine id] [numbits]
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DESCRIPTION

14       This command is used to manipulate or generate DSA parameter files.
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OPTIONS

17       -help
18           Print out a usage message.
19
20       -inform DER|PEM
21           This specifies the input format. The DER option uses an ASN1 DER
22           encoded form compatible with RFC2459 (PKIX) DSS-Parms that is a
23           SEQUENCE consisting of p, q and g respectively. The PEM form is the
24           default format: it consists of the DER format base64 encoded with
25           additional header and footer lines.
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27       -outform DER|PEM
28           This specifies the output format, the options have the same meaning
29           and default as the -inform option.
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31       -in filename
32           This specifies the input filename to read parameters from or
33           standard input if this option is not specified. If the numbits
34           parameter is included then this option will be ignored.
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36       -out filename
37           This specifies the output filename parameters to. Standard output
38           is used if this option is not present. The output filename should
39           not be the same as the input filename.
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41       -noout
42           This option inhibits the output of the encoded version of the
43           parameters.
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45       -text
46           This option prints out the DSA parameters in human readable form.
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48       -C  This option converts the parameters into C code. The parameters can
49           then be loaded by calling the get_dsaXXX() function.
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51       -genkey
52           This option will generate a DSA either using the specified or
53           generated parameters.
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55       -rand file...
56           A file or files containing random data used to seed the random
57           number generator.  Multiple files can be specified separated by an
58           OS-dependent character.  The separator is ; for MS-Windows, , for
59           OpenVMS, and : for all others.
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61       [-writerand file]
62           Writes random data to the specified file upon exit.  This can be
63           used with a subsequent -rand flag.
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65       numbits
66           This option specifies that a parameter set should be generated of
67           size numbits. It must be the last option. If this option is
68           included then the input file (if any) is ignored.
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70       -engine id
71           Specifying an engine (by its unique id string) will cause dsaparam
72           to attempt to obtain a functional reference to the specified
73           engine, thus initialising it if needed. The engine will then be set
74           as the default for all available algorithms.
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NOTES

77       PEM format DSA parameters use the header and footer lines:
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79        -----BEGIN DSA PARAMETERS-----
80        -----END DSA PARAMETERS-----
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82       DSA parameter generation is a slow process and as a result the same set
83       of DSA parameters is often used to generate several distinct keys.
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SEE ALSO

86       gendsa(1), dsa(1), genrsa(1), rsa(1)
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89       Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved.
90
91       Licensed under the OpenSSL license (the "License").  You may not use
92       this file except in compliance with the License.  You can obtain a copy
93       in the file LICENSE in the source distribution or at
94       <https://www.openssl.org/source/license.html>.
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981.1.1l                            2021-09-15                       DSAPARAM(1)
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