6 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 These options encrypt the private key with the supplied cipher. Any algorithm
74 name accepted by EVP_get_cipherbyname() is acceptable such as B<des3>.
78 prints out the various public or private key components in
79 plain text in addition to the encoded version.
83 print out only public key components even if a private key is being processed.
87 do not output the encoded version of the key.
91 by default a private key is read from the input file: with this
92 option a public key is read instead.
96 by default a private key is output: with this option a public
97 key will be output instead. This option is automatically set if
98 the input is a public key.
102 specifying an engine (by its unique B<id> string) will cause B<pkey>
103 to attempt to obtain a functional reference to the specified engine,
104 thus initialising it if needed. The engine will then be set as the default
105 for all available algorithms.
111 To remove the pass phrase on an RSA private key:
113 openssl pkey -in key.pem -out keyout.pem
115 To encrypt a private key using triple DES:
117 openssl pkey -in key.pem -des3 -out keyout.pem
119 To convert a private key from PEM to DER format:
121 openssl pkey -in key.pem -outform DER -out keyout.der
123 To print out the components of a private key to standard output:
125 openssl pkey -in key.pem -text -noout
127 To print out the public components of a private key to standard output:
129 openssl pkey -in key.pem -text_pub -noout
131 To just output the public part of a private key:
133 openssl pkey -in key.pem -pubout -out pubkey.pem
137 L<genpkey(1)>, L<rsa(1)>, L<pkcs8(1)>,
138 L<dsa(1)>, L<genrsa(1)>, L<gendsa(1)>