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. 119With this option a public key is read instead. 120If the input contains no public key but a private key, its public part is used. 121 122=item B<-pubout> 123 124By default, a private key is output. With this option a public 125key will be output instead. This option is automatically set if the input is 126a public key. 127 128=item B<-pvk-strong> 129 130Enable 'Strong' PVK encoding level (default). 131 132=item B<-pvk-weak> 133 134Enable 'Weak' PVK encoding level. 135 136=item B<-pvk-none> 137 138Don't enforce PVK encoding. 139 140{- $OpenSSL::safe::opt_engine_item -} 141 142{- $OpenSSL::safe::opt_provider_item -} 143 144=back 145 146The L<openssl-pkey(1)> command is capable of performing all the operations 147this command can, as well as supporting other public key types. 148 149=head1 EXAMPLES 150 151The documentation for the L<openssl-pkey(1)> command contains examples 152equivalent to the ones listed here. 153 154To remove the pass phrase on a DSA private key: 155 156 openssl dsa -in key.pem -out keyout.pem 157 158To encrypt a private key using triple DES: 159 160 openssl dsa -in key.pem -des3 -out keyout.pem 161 162To convert a private key from PEM to DER format: 163 164 openssl dsa -in key.pem -outform DER -out keyout.der 165 166To print out the components of a private key to standard output: 167 168 openssl dsa -in key.pem -text -noout 169 170To just output the public part of a private key: 171 172 openssl dsa -in key.pem -pubout -out pubkey.pem 173 174=head1 SEE ALSO 175 176L<openssl(1)>, 177L<openssl-pkey(1)>, 178L<openssl-dsaparam(1)>, 179L<openssl-gendsa(1)>, 180L<openssl-rsa(1)>, 181L<openssl-genrsa(1)> 182 183=head1 HISTORY 184 185The B<-engine> option was deprecated in OpenSSL 3.0. 186 187=head1 COPYRIGHT 188 189Copyright 2000-2023 The OpenSSL Project Authors. All Rights Reserved. 190 191Licensed under the Apache License 2.0 (the "License"). You may not use 192this file except in compliance with the License. You can obtain a copy 193in the file LICENSE in the source distribution or at 194L<https://www.openssl.org/source/license.html>. 195 196=cut 197
