4 {- join("\n", @autowarntext) -}
10 openssl-spkac - SPKAC printing and generating command
18 [B<-key> I<filename>|I<uri>]
19 [B<-keyform> B<DER>|B<PEM>|B<P12>|B<ENGINE>]
21 [B<-challenge> I<string>]
23 [B<-spkac> I<spkacname>]
24 [B<-spksect> I<section>]
27 {- $OpenSSL::safe::opt_engine_synopsis -}{- $OpenSSL::safe::opt_provider_synopsis -}
29 =for openssl ifdef engine
33 This command processes Netscape signed public key and challenge
34 (SPKAC) files. It can print out their contents, verify the signature and
35 produce its own SPKACs from a supplied private key.
43 Print out a usage message.
45 =item B<-in> I<filename>
47 This specifies the input filename to read from or standard input if this
48 option is not specified. Ignored if the B<-key> option is used.
50 =item B<-out> I<filename>
52 Specifies the output filename to write to or standard output by
55 =item B<-key> I<filename>|I<uri>
57 Create an SPKAC file using the private key specified by I<filename> or I<uri>.
58 The B<-in>, B<-noout>, B<-spksect> and B<-verify> options are ignored if
61 =item B<-keyform> B<DER>|B<PEM>|B<P12>|B<ENGINE>
63 The key format; unspecified by default.
64 See L<openssl-format-options(1)> for details.
66 =item B<-passin> I<arg>
68 The input file password source. For more information about the format of I<arg>
69 see L<openssl-passphrase-options(1)>.
71 =item B<-challenge> I<string>
73 Specifies the challenge string if an SPKAC is being created.
75 =item B<-spkac> I<spkacname>
77 Allows an alternative name form the variable containing the
78 SPKAC. The default is "SPKAC". This option affects both
79 generated and input SPKAC files.
81 =item B<-spksect> I<section>
83 Allows an alternative name form the section containing the
84 SPKAC. The default is the default section.
88 Don't output the text version of the SPKAC (not used if an
89 SPKAC is being created).
93 Output the public key of an SPKAC (not used if an SPKAC is
98 Verifies the digital signature on the supplied SPKAC.
100 {- $OpenSSL::safe::opt_engine_item -}
102 {- $OpenSSL::safe::opt_provider_item -}
108 Print out the contents of an SPKAC:
110 openssl spkac -in spkac.cnf
112 Verify the signature of an SPKAC:
114 openssl spkac -in spkac.cnf -noout -verify
116 Create an SPKAC using the challenge string "hello":
118 openssl spkac -key key.pem -challenge hello -out spkac.cnf
120 Example of an SPKAC, (long lines split up for clarity):
122 SPKAC=MIG5MGUwXDANBgkqhkiG9w0BAQEFAANLADBIAkEA\
123 1cCoq2Wa3Ixs47uI7FPVwHVIPDx5yso105Y6zpozam135a\
124 8R0CpoRvkkigIyXfcCjiVi5oWk+6FfPaD03uPFoQIDAQAB\
125 FgVoZWxsbzANBgkqhkiG9w0BAQQFAANBAFpQtY/FojdwkJ\
126 h1bEIYuc2EeM2KHTWPEepWYeawvHD0gQ3DngSC75YCWnnD\
127 dq+NQ3F+X4deMx9AaEglZtULwV4=
131 A created SPKAC with suitable DN components appended can be fed to
134 SPKACs are typically generated by Netscape when a form is submitted
135 containing the B<KEYGEN> tag as part of the certificate enrollment
138 The challenge string permits a primitive form of proof of possession
139 of private key. By checking the SPKAC signature and a random challenge
140 string some guarantee is given that the user knows the private key
141 corresponding to the public key being certified. This is important in
142 some applications. Without this it is possible for a previous SPKAC
143 to be used in a "replay attack".
152 The B<-engine> option was deprecated in OpenSSL 3.0.
156 Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.
158 Licensed under the Apache License 2.0 (the "License"). You may not use
159 this file except in compliance with the License. You can obtain a copy
160 in the file LICENSE in the source distribution or at
161 L<https://www.openssl.org/source/license.html>.