4 {- join("\n", @autowarntext) -}
10 openssl-rsa - RSA key processing command
16 [B<-inform> B<DER>|B<PEM>]
17 [B<-outform> B<DER>|B<PEM>]
41 [B<-RSAPublicKey_out>]
42 {- $OpenSSL::safe::opt_engine_synopsis -}
43 {- $OpenSSL::safe::opt_provider_synopsis -}
45 =for openssl ifdef pvk-strong pvk-weak pvk-none engine
49 This command has been deprecated.
50 The L<openssl-pkey(1)> command should be used instead.
52 This command processes RSA keys. They can be converted between
53 various forms and their components printed out. B<Note> this command uses the
54 traditional SSLeay compatible format for private key encryption: newer
55 applications should use the more secure PKCS#8 format using the
56 L<openssl-pkcs8(1)> command.
64 Print out a usage message.
67 =item B<-inform> B<DER>|B<PEM>, B<-outform> B<DER>|B<PEM>
69 The input and formats; the default is B<PEM>.
70 See L<openssl(1)/Format Options> for details.
72 =item B<-inform> B<DER>|B<PEM>
74 The data is a PKCS#1 B<RSAPrivateKey> or B<SubjectPublicKey> object.
75 On input, PKCS#8 format private keys are also accepted.
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<-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<-out> I<filename>
91 This specifies the output filename to write a key to or standard output if this
92 option is not specified. If any encryption options are set then a pass phrase
93 will be prompted for. The output filename should B<not> be the same as the input
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 various public or private key components in
109 plain text in addition to the encoded version.
113 This option prevents output of the encoded version of the key.
117 This option prints out the value of the modulus of the key.
121 This option checks the consistency of an RSA private key.
125 By default a private key is read from the input file: with this
126 option a public key is read instead.
130 By default a private key is output: with this option a public
131 key will be output instead. This option is automatically set if
132 the input is a public key.
134 =item B<-RSAPublicKey_in>, B<-RSAPublicKey_out>
136 Like B<-pubin> and B<-pubout> except B<RSAPublicKey> format is used instead.
138 {- $OpenSSL::safe::opt_engine_item -}
140 {- $OpenSSL::safe::opt_provider_item -}
146 Examples equivalent to these can be found in the documentation for the
147 non-deprecated L<openssl-pkey(1)> command.
149 To remove the pass phrase on an RSA private key:
151 openssl rsa -in key.pem -out keyout.pem
153 To encrypt a private key using triple DES:
155 openssl rsa -in key.pem -des3 -out keyout.pem
157 To convert a private key from PEM to DER format:
159 openssl rsa -in key.pem -outform DER -out keyout.der
161 To print out the components of a private key to standard output:
163 openssl rsa -in key.pem -text -noout
165 To just output the public part of a private key:
167 openssl rsa -in key.pem -pubout -out pubkey.pem
169 Output the public part of a private key in B<RSAPublicKey> format:
171 openssl rsa -in key.pem -RSAPublicKey_out -out pubkey.pem
175 There should be an option that automatically handles F<.key> files,
176 without having to manually edit them.
184 L<openssl-genrsa(1)>,
189 This command was deprecated in OpenSSL 3.0.
193 Copyright 2000-2019 The OpenSSL Project Authors. All Rights Reserved.
195 Licensed under the Apache License 2.0 (the "License"). You may not use
196 this file except in compliance with the License. You can obtain a copy
197 in the file LICENSE in the source distribution or at
198 L<https://www.openssl.org/source/license.html>.