5 pkey - public or private key processing tool
27 The B<pkey> command processes public or private keys. They can be converted
28 between various forms and their components printed out.
30 =head1 COMMAND OPTIONS
36 Print out a usage message.
38 =item B<-inform DER|PEM>
40 This specifies the input format DER or PEM.
42 =item B<-outform DER|PEM>
44 This specifies the output format, the options have the same meaning as the
49 This specifies the input filename to read a key from or standard input if this
50 option is not specified. If the key is encrypted a pass phrase will be
55 the input file password source. For more information about the format of B<arg>
56 see the B<PASS PHRASE ARGUMENTS> section in L<openssl(1)>.
58 =item B<-out filename>
60 This specifies the output filename to write a key to or standard output if this
61 option is not specified. If any encryption options are set then a pass phrase
62 will be prompted for. The output filename should B<not> be the same as the input
65 =item B<-passout password>
67 the output file password source. For more information about the format of B<arg>
68 see the B<PASS PHRASE ARGUMENTS> section in L<openssl(1)>.
72 These options encrypt the private key with the supplied cipher. Any algorithm
73 name accepted by EVP_get_cipherbyname() is acceptable such as B<des3>.
77 prints out the various public or private key components in
78 plain text in addition to the encoded version.
82 print out only public key components even if a private key is being processed.
86 do not output the encoded version of the key.
90 by default a private key is read from the input file: with this
91 option a public key is read instead.
95 by default a private key is output: with this option a public
96 key will be output instead. This option is automatically set if
97 the input is a public key.
101 specifying an engine (by its unique B<id> string) will cause B<pkey>
102 to attempt to obtain a functional reference to the specified engine,
103 thus initialising it if needed. The engine will then be set as the default
104 for all available algorithms.
110 To remove the pass phrase on an RSA private key:
112 openssl pkey -in key.pem -out keyout.pem
114 To encrypt a private key using triple DES:
116 openssl pkey -in key.pem -des3 -out keyout.pem
118 To convert a private key from PEM to DER format:
120 openssl pkey -in key.pem -outform DER -out keyout.der
122 To print out the components of a private key to standard output:
124 openssl pkey -in key.pem -text -noout
126 To print out the public components of a private key to standard output:
128 openssl pkey -in key.pem -text_pub -noout
130 To just output the public part of a private key:
132 openssl pkey -in key.pem -pubout -out pubkey.pem
136 L<genpkey(1)>, L<rsa(1)>, L<pkcs8(1)>,
137 L<dsa(1)>, L<genrsa(1)>, L<gendsa(1)>
141 Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
143 Licensed under the OpenSSL license (the "License"). You may not use
144 this file except in compliance with the License. You can obtain a copy
145 in the file LICENSE in the source distribution or at
146 L<https://www.openssl.org/source/license.html>.