5 openssl-pkey - public or private key processing tool
30 The B<pkey> command processes public or private keys. They can be converted
31 between various forms and their components printed out.
39 Print out a usage message.
41 =item B<-inform DER|PEM>
43 This specifies the input format DER or PEM. The default format is PEM.
45 =item B<-outform DER|PEM>
47 This specifies the output format, the options have the same meaning and default
48 as the B<-inform> option.
52 This specifies the input filename to read a key from or standard input if this
53 option is not specified. If the key is encrypted a pass phrase will be
58 The input file password source. For more information about the format of B<arg>
59 see the B<PASS PHRASE ARGUMENTS> section in L<openssl(1)>.
61 =item B<-out filename>
63 This specifies the output filename to write a key to or standard output if this
64 option is not specified. If any encryption options are set then a pass phrase
65 will be prompted for. The output filename should B<not> be the same as the input
68 =item B<-passout password>
70 The output file password source. For more information about the format of B<arg>
71 see the B<PASS PHRASE ARGUMENTS> section in L<openssl(1)>.
75 Normally a private key is written using standard format: this is PKCS#8 form
76 with the appropriate encryption algorithm (if any). If the B<-traditional>
77 option is specified then the older "traditional" format is used instead.
81 These options encrypt the private key with the supplied cipher. Any algorithm
82 name accepted by EVP_get_cipherbyname() is acceptable such as B<des3>.
86 Prints out the various public or private key components in
87 plain text in addition to the encoded version.
91 Print out only public key components even if a private key is being processed.
95 Do not output the encoded version of the key.
99 By default a private key is read from the input file: with this
100 option a public key is read instead.
104 By default a private key is output: with this option a public
105 key will be output instead. This option is automatically set if
106 the input is a public key.
110 Specifying an engine (by its unique B<id> string) will cause B<pkey>
111 to attempt to obtain a functional reference to the specified engine,
112 thus initialising it if needed. The engine will then be set as the default
113 for all available algorithms.
117 This option checks the consistency of a key pair for both public and private
122 This option checks the correctness of either a public key or the public component
129 To remove the pass phrase on an RSA private key:
131 openssl pkey -in key.pem -out keyout.pem
133 To encrypt a private key using triple DES:
135 openssl pkey -in key.pem -des3 -out keyout.pem
137 To convert a private key from PEM to DER format:
139 openssl pkey -in key.pem -outform DER -out keyout.der
141 To print out the components of a private key to standard output:
143 openssl pkey -in key.pem -text -noout
145 To print out the public components of a private key to standard output:
147 openssl pkey -in key.pem -text_pub -noout
149 To just output the public part of a private key:
151 openssl pkey -in key.pem -pubout -out pubkey.pem
156 L<openssl-genpkey(1)>,
160 L<openssl-genrsa(1)>,
165 Copyright 2006-2019 The OpenSSL Project Authors. All Rights Reserved.
167 Licensed under the Apache License 2.0 (the "License"). You may not use
168 this file except in compliance with the License. You can obtain a copy
169 in the file LICENSE in the source distribution or at
170 L<https://www.openssl.org/source/license.html>.