openssl spkac [-help] [-in filename] [-out filename] [-key keyfile]
       [-passin arg] [-challenge string] [-pubkey] [-spkac spkacname]
       [-spksect section] [-noout] [-verify] [-engine id]

       The spkac command processes Netscape signed public key and challenge
       (SPKAC) files. It can print out their contents, verify the signature
       and produce its own SPKACs from a supplied private key.

           Print out a usage message.

       -in filename
           This specifies the input filename to read from or standard input if
           this option is not specified. Ignored if the -key option is used.

       -out filename
           specifies the output filename to write to or standard output by

       -key keyfile
           create an SPKAC file using the private key in keyfile. The -in,
           -noout, -spksect and -verify options are ignored if present.

       -passin password
           the input file password source. For more information about the
           format of arg see the PASS PHRASE ARGUMENTS section in openssl(1).

       -challenge string
           specifies the challenge string if an SPKAC is being created.

       -spkac spkacname
           allows an alternative name form the variable containing the SPKAC.
           The default is "SPKAC". This option affects both generated and
           input SPKAC files.

       -spksect section
           allows an alternative name form the section containing the SPKAC.
           The default is the default section.

           don't output the text version of the SPKAC (not used if an SPKAC is
           being created).

           output the public key of an SPKAC (not used if an SPKAC is being

           verifies the digital signature on the supplied SPKAC.

       -engine id
           specifying an engine (by its unique id string) will cause spkac to

       Create an SPKAC using the challenge string "hello":

        openssl spkac -key key.pem -challenge hello -out spkac.cnf

       Example of an SPKAC, (long lines split up for clarity):


       A created SPKAC with suitable DN components appended can be fed into
       the ca utility.

       SPKACs are typically generated by Netscape when a form is submitted
       containing the KEYGEN tag as part of the certificate enrollment

       The challenge string permits a primitive form of proof of possession of
       private key. By checking the SPKAC signature and a random challenge
       string some guarantee is given that the user knows the private key
       corresponding to the public key being certified. This is important in
       some applications. Without this it is possible for a previous SPKAC to
       be used in a "replay attack".


       Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the OpenSSL license (the "License").  You may not use
       this file except in compliance with the License.  You can obtain a copy
       in the file LICENSE in the source distribution or at

1.1.0h                            2018-05-12                       SPKAC(1SSL)
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