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134 lines
3.3 KiB
134 lines
3.3 KiB
14 years ago
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=pod
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=head1 NAME
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spkac - SPKAC printing and generating utility
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=head1 SYNOPSIS
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B<openssl> B<spkac>
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[B<-in filename>]
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[B<-out filename>]
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[B<-key keyfile>]
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[B<-passin arg>]
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[B<-challenge string>]
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[B<-pubkey>]
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[B<-spkac spkacname>]
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[B<-spksect section>]
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[B<-noout>]
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[B<-verify>]
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[B<-engine id>]
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=head1 DESCRIPTION
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The B<spkac> command processes Netscape signed public key and challenge
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(SPKAC) files. It can print out their contents, verify the signature and
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produce its own SPKACs from a supplied private key.
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=head1 COMMAND OPTIONS
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=over 4
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=item B<-in filename>
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This specifies the input filename to read from or standard input if this
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option is not specified. Ignored if the B<-key> option is used.
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=item B<-out filename>
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specifies the output filename to write to or standard output by
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default.
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=item B<-key keyfile>
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create an SPKAC file using the private key in B<keyfile>. The
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B<-in>, B<-noout>, B<-spksect> and B<-verify> options are ignored if
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present.
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=item B<-passin password>
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the input file password source. For more information about the format of B<arg>
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see the B<PASS PHRASE ARGUMENTS> section in L<openssl(1)|openssl(1)>.
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=item B<-challenge string>
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specifies the challenge string if an SPKAC is being created.
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=item B<-spkac spkacname>
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allows an alternative name form the variable containing the
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SPKAC. The default is "SPKAC". This option affects both
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generated and input SPKAC files.
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=item B<-spksect section>
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allows an alternative name form the section containing the
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SPKAC. The default is the default section.
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=item B<-noout>
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don't output the text version of the SPKAC (not used if an
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SPKAC is being created).
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=item B<-pubkey>
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output the public key of an SPKAC (not used if an SPKAC is
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being created).
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=item B<-verify>
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verifies the digital signature on the supplied SPKAC.
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=item B<-engine id>
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specifying an engine (by its unique B<id> string) will cause B<spkac>
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to attempt to obtain a functional reference to the specified engine,
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thus initialising it if needed. The engine will then be set as the default
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for all available algorithms.
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=back
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=head1 EXAMPLES
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Print out the contents of an SPKAC:
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openssl spkac -in spkac.cnf
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Verify the signature of an SPKAC:
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openssl spkac -in spkac.cnf -noout -verify
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Create an SPKAC using the challenge string "hello":
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openssl spkac -key key.pem -challenge hello -out spkac.cnf
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Example of an SPKAC, (long lines split up for clarity):
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SPKAC=MIG5MGUwXDANBgkqhkiG9w0BAQEFAANLADBIAkEA1cCoq2Wa3Ixs47uI7F\
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PVwHVIPDx5yso105Y6zpozam135a8R0CpoRvkkigIyXfcCjiVi5oWk+6FfPaD03u\
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PFoQIDAQABFgVoZWxsbzANBgkqhkiG9w0BAQQFAANBAFpQtY/FojdwkJh1bEIYuc\
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2EeM2KHTWPEepWYeawvHD0gQ3DngSC75YCWnnDdq+NQ3F+X4deMx9AaEglZtULwV\
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4=
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=head1 NOTES
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A created SPKAC with suitable DN components appended can be fed into
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the B<ca> utility.
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SPKACs are typically generated by Netscape when a form is submitted
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containing the B<KEYGEN> tag as part of the certificate enrollment
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process.
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The challenge string permits a primitive form of proof of possession
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of private key. By checking the SPKAC signature and a random challenge
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string some guarantee is given that the user knows the private key
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corresponding to the public key being certified. This is important in
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some applications. Without this it is possible for a previous SPKAC
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to be used in a "replay attack".
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=head1 SEE ALSO
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L<ca(1)|ca(1)>
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=cut
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