1=pod
2
3=begin comment
4{- join("\n", @autowarntext) -}
5
6=end comment
7
8=head1 NAME
9
10openssl-dsa - DSA key processing
11
12=head1 SYNOPSIS
13
14B<openssl> B<dsa>
15[B<-help>]
16[B<-inform> B<DER>|B<PEM>]
17[B<-outform> B<DER>|B<PEM>]
18[B<-in> I<filename>]
19[B<-passin> I<arg>]
20[B<-out> I<filename>]
21[B<-passout> I<arg>]
22[B<-aes128>]
23[B<-aes192>]
24[B<-aes256>]
25[B<-aria128>]
26[B<-aria192>]
27[B<-aria256>]
28[B<-camellia128>]
29[B<-camellia192>]
30[B<-camellia256>]
31[B<-des>]
32[B<-des3>]
33[B<-idea>]
34[B<-text>]
35[B<-noout>]
36[B<-modulus>]
37[B<-pubin>]
38[B<-pubout>]
39[B<-pvk-strong>]
40[B<-pvk-weak>]
41[B<-pvk-none>]
42{- $OpenSSL::safe::opt_engine_synopsis -}{- $OpenSSL::safe::opt_provider_synopsis -}
43
44=head1 DESCRIPTION
45
46This command processes DSA keys. They can be converted between various
47forms and their components printed out. B<Note> This command uses the
48traditional SSLeay compatible format for private key encryption: newer
49applications should use the more secure PKCS#8 format using the B<pkcs8>
50
51=head1 OPTIONS
52
53=over 4
54
55=item B<-help>
56
57Print out a usage message.
58
59=item B<-inform> B<DER>|B<PEM>
60
61The key input format; unspecified by default.
62See L<openssl-format-options(1)> for details.
63
64=item B<-outform> B<DER>|B<PEM>
65
66The key output format; the default is B<PEM>.
67See L<openssl-format-options(1)> for details.
68
69Private keys are a sequence of B<ASN.1 INTEGERS>: the version (zero), B<p>,
70B<q>, B<g>, and the public and private key components.  Public keys
71are a B<SubjectPublicKeyInfo> structure with the B<DSA> type.
72
73The B<PEM> format also accepts PKCS#8 data.
74
75=item B<-in> I<filename>
76
77This specifies the input filename to read a key from or standard input if this
78option is not specified. If the key is encrypted a pass phrase will be
79prompted for.
80
81=item B<-out> I<filename>
82
83This specifies the output filename to write a key to or standard output by
84is not specified. If any encryption options are set then a pass phrase will be
85prompted for. The output filename should B<not> be the same as the input
86filename.
87
88=item B<-passin> I<arg>, B<-passout> I<arg>
89
90The password source for the input and output file.
91For more information about the format of B<arg>
92see L<openssl-passphrase-options(1)>.
93
94=item B<-aes128>, B<-aes192>, B<-aes256>, B<-aria128>, B<-aria192>, B<-aria256>, B<-camellia128>, B<-camellia192>, B<-camellia256>, B<-des>, B<-des3>, B<-idea>
95
96These options encrypt the private key with the specified
97cipher before outputting it. A pass phrase is prompted for.
98If none of these options is specified the key is written in plain text. This
99means that this command can be used to remove the pass phrase from a key
100by not giving any encryption option is given, or to add or change the pass
101phrase by setting them.
102These options can only be used with PEM format output files.
103
104=item B<-text>
105
106Prints out the public, private key components and parameters.
107
108=item B<-noout>
109
110This option prevents output of the encoded version of the key.
111
112=item B<-modulus>
113
114This option prints out the value of the public key component of the key.
115
116=item B<-pubin>
117
118By default, a private key is read from the input file. With this option a
119public key is read instead.
120
121=item B<-pubout>
122
123By default, a private key is output. With this option a public
124key will be output instead. This option is automatically set if the input is
125a public key.
126
127=item B<-pvk-strong>
128
129Enable 'Strong' PVK encoding level (default).
130
131=item B<-pvk-weak>
132
133Enable 'Weak' PVK encoding level.
134
135=item B<-pvk-none>
136
137Don't enforce PVK encoding.
138
139{- $OpenSSL::safe::opt_engine_item -}
140
141{- $OpenSSL::safe::opt_provider_item -}
142
143=back
144
145The L<openssl-pkey(1)> command is capable of performing all the operations
146this command can, as well as supporting other public key types.
147
148=head1 EXAMPLES
149
150The documentation for the L<openssl-pkey(1)> command contains examples
151equivalent to the ones listed here.
152
153To remove the pass phrase on a DSA private key:
154
155 openssl dsa -in key.pem -out keyout.pem
156
157To encrypt a private key using triple DES:
158
159 openssl dsa -in key.pem -des3 -out keyout.pem
160
161To convert a private key from PEM to DER format:
162
163 openssl dsa -in key.pem -outform DER -out keyout.der
164
165To print out the components of a private key to standard output:
166
167 openssl dsa -in key.pem -text -noout
168
169To just output the public part of a private key:
170
171 openssl dsa -in key.pem -pubout -out pubkey.pem
172
173=head1 SEE ALSO
174
175L<openssl(1)>,
176L<openssl-pkey(1)>,
177L<openssl-dsaparam(1)>,
178L<openssl-gendsa(1)>,
179L<openssl-rsa(1)>,
180L<openssl-genrsa(1)>
181
182=head1 HISTORY
183
184The B<-engine> option was deprecated in OpenSSL 3.0.
185
186=head1 COPYRIGHT
187
188Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.
189
190Licensed under the Apache License 2.0 (the "License").  You may not use
191this file except in compliance with the License.  You can obtain a copy
192in the file LICENSE in the source distribution or at
193L<https://www.openssl.org/source/license.html>.
194
195=cut
196