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 sec-
tion] [-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.
This specifies the input filename to read from or standard input if
this option is not specified. Ignored if the -key option is used.
specifies the output filename to write to or standard output by
create an SPKAC file using the private key in keyfile. The -in,
-noout, -spksect and -verify options are ignored if present.
the input file password source. For more information about the for-
mat of arg see the PASS PHRASE ARGUMENTS section in openssl(1).
specifies the challenge string if an SPKAC is being created.
allows an alternative name form the variable containing the SPKAC.
The default is "SPKAC". This option affects both generated and
input SPKAC files.
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
output the public key of an SPKAC (not used if an SPKAC is being
verifies the digital signature on the supplied SPKAC.
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.
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 pro-
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 cor-
responding 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".
0.9.7a 2003-01-30 SPKAC(1)