spkac(1) - phpMan

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SPKAC(1)                            OpenSSL                           SPKAC(1)

       spkac - SPKAC printing and generating utility

       openssl spkac [-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.

       -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.

       -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

           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

       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

       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".


1.0.1e                            2013-02-11                          SPKAC(1)

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