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       openssl-spkac, spkac - SPKAC printing and generating utility


       openssl spkac [-help] [-in filename] [-out filename] [-key keyfile] [-keyform
       PEM|DER|ENGINE] [-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 default.

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

       -keyform PEM|DER|ENGINE
           Whether the key format is PEM, DER, or an engine-backed key.  The default is PEM.

       -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 created).

           Verifies the digital signature on the supplied SPKAC.

       -engine id
           Specifying an engine (by its unique id string) will cause spkac to attempt to obtain a
           functional reference to the specified engine, thus initialising it if needed. The
           engine will then be set as the default for all available algorithms.


       Print out the contents of an SPKAC:

        openssl spkac -in spkac.cnf

       Verify the signature of an SPKAC:

        openssl spkac -in spkac.cnf -noout -verify

       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 process.

       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 2000-2018 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 <>.