SPKAC(1) OpenSSL SPKAC(1)
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 it's unique id string) will cause req 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)
0.9.7l 2003-01-30 SPKAC(1)
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