4 {- join("\n", @autowarntext) -}
10 openssl-dsa - DSA key processing
16 [B<-inform> B<DER>|B<PEM>]
17 [B<-outform> B<DER>|B<PEM>]
42 {- $OpenSSL::safe::opt_engine_synopsis -}{- $OpenSSL::safe::opt_provider_synopsis -}
46 This command processes DSA keys. They can be converted between various
47 forms and their components printed out. B<Note> This command uses the
48 traditional SSLeay compatible format for private key encryption: newer
49 applications should use the more secure PKCS#8 format using the B<pkcs8>
57 Print out a usage message.
59 =item B<-inform> B<DER>|B<PEM>
61 The key input format; unspecified by default.
62 See L<openssl-format-options(1)> for details.
64 =item B<-outform> B<DER>|B<PEM>
66 The key output format; the default is B<PEM>.
67 See L<openssl-format-options(1)> for details.
69 Private keys are a sequence of B<ASN.1 INTEGERS>: the version (zero), B<p>,
70 B<q>, B<g>, and the public and private key components. Public keys
71 are a B<SubjectPublicKeyInfo> structure with the B<DSA> type.
73 The B<PEM> format also accepts PKCS#8 data.
75 =item B<-in> I<filename>
77 This specifies the input filename to read a key from or standard input if this
78 option is not specified. If the key is encrypted a pass phrase will be
81 =item B<-out> I<filename>
83 This specifies the output filename to write a key to or standard output by
84 is not specified. If any encryption options are set then a pass phrase will be
85 prompted for. The output filename should B<not> be the same as the input
88 =item B<-passin> I<arg>, B<-passout> I<arg>
90 The password source for the input and output file.
91 For more information about the format of B<arg>
92 see L<openssl-passphrase-options(1)>.
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>
96 These options encrypt the private key with the specified
97 cipher before outputting it. A pass phrase is prompted for.
98 If none of these options is specified the key is written in plain text. This
99 means that this command can be used to remove the pass phrase from a key
100 by not giving any encryption option is given, or to add or change the pass
101 phrase by setting them.
102 These options can only be used with PEM format output files.
106 Prints out the public, private key components and parameters.
110 This option prevents output of the encoded version of the key.
114 This option prints out the value of the public key component of the key.
118 By default, a private key is read from the input file. With this option a
119 public key is read instead.
123 By default, a private key is output. With this option a public
124 key will be output instead. This option is automatically set if the input is
129 Enable 'Strong' PVK encoding level (default).
133 Enable 'Weak' PVK encoding level.
137 Don't enforce PVK encoding.
139 {- $OpenSSL::safe::opt_engine_item -}
141 {- $OpenSSL::safe::opt_provider_item -}
145 The L<openssl-pkey(1)> command is capable of performing all the operations
146 this command can, as well as supporting other public key types.
150 The documentation for the L<openssl-pkey(1)> command contains examples
151 equivalent to the ones listed here.
153 To remove the pass phrase on a DSA private key:
155 openssl dsa -in key.pem -out keyout.pem
157 To encrypt a private key using triple DES:
159 openssl dsa -in key.pem -des3 -out keyout.pem
161 To convert a private key from PEM to DER format:
163 openssl dsa -in key.pem -outform DER -out keyout.der
165 To print out the components of a private key to standard output:
167 openssl dsa -in key.pem -text -noout
169 To just output the public part of a private key:
171 openssl dsa -in key.pem -pubout -out pubkey.pem
177 L<openssl-dsaparam(1)>,
178 L<openssl-gendsa(1)>,
184 The B<-engine> option was deprecated in OpenSSL 3.0.
188 Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.
190 Licensed under the Apache License 2.0 (the "License"). You may not use
191 this file except in compliance with the License. You can obtain a copy
192 in the file LICENSE in the source distribution or at
193 L<https://www.openssl.org/source/license.html>.