spkac - SPKAC printing and generating utility


SYNOPSIS

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


DESCRIPTION

       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.


COMMAND OPTIONS

       -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.

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

       -pubkey
           output the public key of an SPKAC (not used if an
           SPKAC is being created).

           verifies the digital signature on the supplied SPKAC.


EXAMPLES

       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):

        SPKAC=MIG5MGUwXDANBgkqhkiG9w0BAQEFAANLADBIAkEA1cCoq2Wa3Ixs47uI7F\
        PVwHVIPDx5yso105Y6zpozam135a8R0CpoRvkkigIyXfcCjiVi5oWk+6FfPaD03u\
        PFoQIDAQABFgVoZWxsbzANBgkqhkiG9w0BAQQFAANBAFpQtY/FojdwkJh1bEIYuc\
        2EeM2KHTWPEepWYeawvHD0gQ3DngSC75YCWnnDdq+NQ3F+X4deMx9AaEglZtULwV\
        4=


NOTES

       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".


SEE ALSO

       ca(1)



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