spkac(1ssl)


NAME

   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] [-engine id]

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).

   -verify
       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.

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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