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 -}
40 {- $OpenSSL::safe::opt_provider_synopsis -}
42 =for openssl ifdef pvk-string pvk-weak pvk-none engine
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>, B<-outform> B<DER>|B<PEM>
61 The input and formats; the default is B<PEM>.
62 See L<openssl(1)/Format Options> for details.
64 Private keys are a sequence of B<ASN.1 INTEGERS>: the version (zero), B<p>,
65 B<q>, B<g>, and the public and and private key components. Public keys
66 are a B<SubjectPublicKeyInfo> structure with the B<DSA> type.
68 The B<PEM> format also accepts PKCS#8 data.
70 =item B<-in> I<filename>
72 This specifies the input filename to read a key from or standard input if this
73 option is not specified. If the key is encrypted a pass phrase will be
76 =item B<-out> I<filename>
78 This specifies the output filename to write a key to or standard output by
79 is not specified. If any encryption options are set then a pass phrase will be
80 prompted for. The output filename should B<not> be the same as the input
83 =item B<-passin> I<arg>, B<-passout> I<arg>
85 The password source for the input and output file.
86 For more information about the format of B<arg>
87 see L<openssl(1)/Pass Phrase Options>.
89 =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>
91 These options encrypt the private key with the specified
92 cipher before outputting it. A pass phrase is prompted for.
93 If none of these options is specified the key is written in plain text. This
94 means that this command can be used to remove the pass phrase from a key
95 by not giving any encryption option is given, or to add or change the pass
96 phrase by setting them.
97 These options can only be used with PEM format output files.
101 Prints out the public, private key components and parameters.
105 This option prevents output of the encoded version of the key.
109 This option prints out the value of the public key component of the key.
113 By default, a private key is read from the input file. With this option a
114 public key is read instead.
118 By default, a private key is output. With this option a public
119 key will be output instead. This option is automatically set if the input is
122 {- $OpenSSL::safe::opt_engine_item -}
124 {- $OpenSSL::safe::opt_provider_item -}
130 Examples equivalent to these can be found in the documentation for the
131 non-deprecated L<openssl-pkey(1)> command.
133 To remove the pass phrase on a DSA private key:
135 openssl dsa -in key.pem -out keyout.pem
137 To encrypt a private key using triple DES:
139 openssl dsa -in key.pem -des3 -out keyout.pem
141 To convert a private key from PEM to DER format:
143 openssl dsa -in key.pem -outform DER -out keyout.der
145 To print out the components of a private key to standard output:
147 openssl dsa -in key.pem -text -noout
149 To just output the public part of a private key:
151 openssl dsa -in key.pem -pubout -out pubkey.pem
157 L<openssl-dsaparam(1)>,
158 L<openssl-gendsa(1)>,
164 Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.
166 Licensed under the Apache License 2.0 (the "License"). You may not use
167 this file except in compliance with the License. You can obtain a copy
168 in the file LICENSE in the source distribution or at
169 L<https://www.openssl.org/source/license.html>.