4 {- join("\n", @autowarntext) -}
10 openssl-dsa - DSA key processing
16 [B<-inform> B<DER>|B<PEM>]
17 [B<-outform> B<DER>|B<PEM>]
39 {- $OpenSSL::safe::opt_engine_synopsis -}{- $OpenSSL::safe::opt_provider_synopsis -}
41 =for openssl ifdef pvk-string pvk-weak pvk-none engine
45 This command processes DSA keys. They can be converted between various
46 forms and their components printed out. B<Note> This command uses the
47 traditional SSLeay compatible format for private key encryption: newer
48 applications should use the more secure PKCS#8 format using the B<pkcs8>
56 Print out a usage message.
58 =item B<-inform> B<DER>|B<PEM>, B<-outform> B<DER>|B<PEM>
60 The input and formats; the default is B<PEM>.
61 See L<openssl-format-options(1)/Format Options> for details.
63 Private keys are a sequence of B<ASN.1 INTEGERS>: the version (zero), B<p>,
64 B<q>, B<g>, and the public and private key components. Public keys
65 are a B<SubjectPublicKeyInfo> structure with the B<DSA> type.
67 The B<PEM> format also accepts PKCS#8 data.
69 =item B<-in> I<filename>
71 This specifies the input filename to read a key from or standard input if this
72 option is not specified. If the key is encrypted a pass phrase will be
75 =item B<-out> I<filename>
77 This specifies the output filename to write a key to or standard output by
78 is not specified. If any encryption options are set then a pass phrase will be
79 prompted for. The output filename should B<not> be the same as the input
82 =item B<-passin> I<arg>, B<-passout> I<arg>
84 The password source for the input and output file.
85 For more information about the format of B<arg>
86 see L<openssl-passphrase-options(1)/Pass Phrase Options>.
88 =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>
90 These options encrypt the private key with the specified
91 cipher before outputting it. A pass phrase is prompted for.
92 If none of these options is specified the key is written in plain text. This
93 means that this command can be used to remove the pass phrase from a key
94 by not giving any encryption option is given, or to add or change the pass
95 phrase by setting them.
96 These options can only be used with PEM format output files.
100 Prints out the public, private key components and parameters.
104 This option prevents output of the encoded version of the key.
108 This option prints out the value of the public key component of the key.
112 By default, a private key is read from the input file. With this option a
113 public key is read instead.
117 By default, a private key is output. With this option a public
118 key will be output instead. This option is automatically set if the input is
121 {- $OpenSSL::safe::opt_engine_item -}
123 {- $OpenSSL::safe::opt_provider_item -}
129 Examples equivalent to these can be found in the documentation for the
130 non-deprecated L<openssl-pkey(1)> command.
132 To remove the pass phrase on a DSA private key:
134 openssl dsa -in key.pem -out keyout.pem
136 To encrypt a private key using triple DES:
138 openssl dsa -in key.pem -des3 -out keyout.pem
140 To convert a private key from PEM to DER format:
142 openssl dsa -in key.pem -outform DER -out keyout.der
144 To print out the components of a private key to standard output:
146 openssl dsa -in key.pem -text -noout
148 To just output the public part of a private key:
150 openssl dsa -in key.pem -pubout -out pubkey.pem
156 L<openssl-dsaparam(1)>,
157 L<openssl-gendsa(1)>,
163 The B<-engine> option was deprecated in OpenSSL 3.0.
167 Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.
169 Licensed under the Apache License 2.0 (the "License"). You may not use
170 this file except in compliance with the License. You can obtain a copy
171 in the file LICENSE in the source distribution or at
172 L<https://www.openssl.org/source/license.html>.