4 {- join("\n", @autowarntext) -}
10 openssl-spkac - SPKAC printing and generating utility
19 [B<-keyform> B<DER>|B<PEM>|B<ENGINE>]
21 [B<-challenge> I<string>]
23 [B<-spkac> I<spkacname>]
24 [B<-spksect> I<section>]
27 {- $OpenSSL::safe::opt_engine_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<keyfile>
57 Create an SPKAC file using the private key in I<keyfile>. The
58 B<-in>, B<-noout>, B<-spksect> and B<-verify> options are ignored if
61 =item B<-keyform> B<DER>|B<PEM>|B<ENGINE>
63 The key format; the default is B<PEM>.
64 See L<openssl(1)/Format Options> 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(1)/Pass Phrase Options>.
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 -}
106 Print out the contents of an SPKAC:
108 openssl spkac -in spkac.cnf
110 Verify the signature of an SPKAC:
112 openssl spkac -in spkac.cnf -noout -verify
114 Create an SPKAC using the challenge string "hello":
116 openssl spkac -key key.pem -challenge hello -out spkac.cnf
118 Example of an SPKAC, (long lines split up for clarity):
120 SPKAC=MIG5MGUwXDANBgkqhkiG9w0BAQEFAANLADBIAkEA\
121 1cCoq2Wa3Ixs47uI7FPVwHVIPDx5yso105Y6zpozam135a\
122 8R0CpoRvkkigIyXfcCjiVi5oWk+6FfPaD03uPFoQIDAQAB\
123 FgVoZWxsbzANBgkqhkiG9w0BAQQFAANBAFpQtY/FojdwkJ\
124 h1bEIYuc2EeM2KHTWPEepWYeawvHD0gQ3DngSC75YCWnnD\
125 dq+NQ3F+X4deMx9AaEglZtULwV4=
129 A created SPKAC with suitable DN components appended can be fed to
132 SPKACs are typically generated by Netscape when a form is submitted
133 containing the B<KEYGEN> tag as part of the certificate enrollment
136 The challenge string permits a primitive form of proof of possession
137 of private key. By checking the SPKAC signature and a random challenge
138 string some guarantee is given that the user knows the private key
139 corresponding to the public key being certified. This is important in
140 some applications. Without this it is possible for a previous SPKAC
141 to be used in a "replay attack".
150 Copyright 2000-2019 The OpenSSL Project Authors. All Rights Reserved.
152 Licensed under the Apache License 2.0 (the "License"). You may not use
153 this file except in compliance with the License. You can obtain a copy
154 in the file LICENSE in the source distribution or at
155 L<https://www.openssl.org/source/license.html>.