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 -}
44 =for openssl ifdef pvk-strong pvk-weak pvk-none engine
48 This command processes DSA keys. They can be converted between various
49 forms and their components printed out. B<Note> This command uses the
50 traditional SSLeay compatible format for private key encryption: newer
51 applications should use the more secure PKCS#8 format using the B<pkcs8>
59 Print out a usage message.
61 =item B<-inform> B<DER>|B<PEM>
63 The key input format; unspecified by default.
64 See L<openssl-format-options(1)> for details.
66 =item B<-outform> B<DER>|B<PEM>
68 The key output format; the default is B<PEM>.
69 See L<openssl-format-options(1)> for details.
71 Private keys are a sequence of B<ASN.1 INTEGERS>: the version (zero), B<p>,
72 B<q>, B<g>, and the public and private key components. Public keys
73 are a B<SubjectPublicKeyInfo> structure with the B<DSA> type.
75 The B<PEM> format also accepts PKCS#8 data.
77 =item B<-in> I<filename>
79 This specifies the input filename to read a key from or standard input if this
80 option is not specified. If the key is encrypted a pass phrase will be
83 =item B<-out> I<filename>
85 This specifies the output filename to write a key to or standard output by
86 is not specified. If any encryption options are set then a pass phrase will be
87 prompted for. The output filename should B<not> be the same as the input
90 =item B<-passin> I<arg>, B<-passout> I<arg>
92 The password source for the input and output file.
93 For more information about the format of B<arg>
94 see L<openssl-passphrase-options(1)>.
96 =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>
98 These options encrypt the private key with the specified
99 cipher before outputting it. A pass phrase is prompted for.
100 If none of these options is specified the key is written in plain text. This
101 means that this command can be used to remove the pass phrase from a key
102 by not giving any encryption option is given, or to add or change the pass
103 phrase by setting them.
104 These options can only be used with PEM format output files.
108 Prints out the public, private key components and parameters.
112 This option prevents output of the encoded version of the key.
116 This option prints out the value of the public key component of the key.
120 By default, a private key is read from the input file. With this option a
121 public key is read instead.
125 By default, a private key is output. With this option a public
126 key will be output instead. This option is automatically set if the input is
131 Enable 'Strong' PVK encoding level (default).
135 Enable 'Weak' PVK encoding level.
139 Don't enforce PVK encoding.
141 {- $OpenSSL::safe::opt_engine_item -}
143 {- $OpenSSL::safe::opt_provider_item -}
147 The L<openssl-pkey(1)> command is capable of performing all the operations
148 this command can, as well as supporting other public key types.
152 The documentation for the L<openssl-pkey(1)> command contains examples
153 equivalent to the ones listed here.
155 To remove the pass phrase on a DSA private key:
157 openssl dsa -in key.pem -out keyout.pem
159 To encrypt a private key using triple DES:
161 openssl dsa -in key.pem -des3 -out keyout.pem
163 To convert a private key from PEM to DER format:
165 openssl dsa -in key.pem -outform DER -out keyout.der
167 To print out the components of a private key to standard output:
169 openssl dsa -in key.pem -text -noout
171 To just output the public part of a private key:
173 openssl dsa -in key.pem -pubout -out pubkey.pem
179 L<openssl-dsaparam(1)>,
180 L<openssl-gendsa(1)>,
186 The B<-engine> option was deprecated in OpenSSL 3.0.
190 Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.
192 Licensed under the Apache License 2.0 (the "License"). You may not use
193 this file except in compliance with the License. You can obtain a copy
194 in the file LICENSE in the source distribution or at
195 L<https://www.openssl.org/source/license.html>.