5 pkey - public or private key processing tool
28 The B<pkey> command processes public or private keys. They can be converted
29 between various forms and their components printed out.
31 =head1 COMMAND OPTIONS
37 Print out a usage message.
39 =item B<-inform DER|PEM>
41 This specifies the input format DER or PEM.
43 =item B<-outform DER|PEM>
45 This specifies the output format, the options have the same meaning as the
50 This specifies the input filename to read a key from or standard input if this
51 option is not specified. If the key is encrypted a pass phrase will be
56 the input file password source. For more information about the format of B<arg>
57 see the B<PASS PHRASE ARGUMENTS> section in L<openssl(1)>.
59 =item B<-out filename>
61 This specifies the output filename to write a key to or standard output if this
62 option is not specified. If any encryption options are set then a pass phrase
63 will be prompted for. The output filename should B<not> be the same as the input
66 =item B<-passout password>
68 the output file password source. For more information about the format of B<arg>
69 see the B<PASS PHRASE ARGUMENTS> section in L<openssl(1)>.
73 normally a private key is written using standard format: this is PKCS#8 form
74 with the appropriate encryption algorithm (if any). If the B<-traditional>
75 option is specified then the older "traditional" format is used instead.
79 These options encrypt the private key with the supplied cipher. Any algorithm
80 name accepted by EVP_get_cipherbyname() is acceptable such as B<des3>.
84 prints out the various public or private key components in
85 plain text in addition to the encoded version.
89 print out only public key components even if a private key is being processed.
93 do not output the encoded version of the key.
97 by default a private key is read from the input file: with this
98 option a public key is read instead.
102 by default a private key is output: with this option a public
103 key will be output instead. This option is automatically set if
104 the input is a public key.
108 specifying an engine (by its unique B<id> string) will cause B<pkey>
109 to attempt to obtain a functional reference to the specified engine,
110 thus initialising it if needed. The engine will then be set as the default
111 for all available algorithms.
117 To remove the pass phrase on an RSA private key:
119 openssl pkey -in key.pem -out keyout.pem
121 To encrypt a private key using triple DES:
123 openssl pkey -in key.pem -des3 -out keyout.pem
125 To convert a private key from PEM to DER format:
127 openssl pkey -in key.pem -outform DER -out keyout.der
129 To print out the components of a private key to standard output:
131 openssl pkey -in key.pem -text -noout
133 To print out the public components of a private key to standard output:
135 openssl pkey -in key.pem -text_pub -noout
137 To just output the public part of a private key:
139 openssl pkey -in key.pem -pubout -out pubkey.pem
143 L<genpkey(1)>, L<rsa(1)>, L<pkcs8(1)>,
144 L<dsa(1)>, L<genrsa(1)>, L<gendsa(1)>
148 Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
150 Licensed under the OpenSSL license (the "License"). You may not use
151 this file except in compliance with the License. You can obtain a copy
152 in the file LICENSE in the source distribution or at
153 L<https://www.openssl.org/source/license.html>.