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Manpages SPKACSection: OpenSSL (1ssl)Updated: 0.9.6c Index Return to Main Contents NAMEspkac - SPKAC printing and generating utilitySYNOPSISopenssl spkac [-in filename] [-out filename] [-key keyfile] [-passin arg] [-challenge string] [-pubkey] [-spkac spkacname] [-spksect section] [-noout] [-verify]DESCRIPTIONThe 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
EXAMPLESPrint out the contents of an SPKAC:
openssl spkac -in spkac.cnfVerify the signature of an SPKAC:
openssl spkac -in spkac.cnf -noout -verifyCreate an SPKAC using the challenge string ``hello":
openssl spkac -key key.pem -challenge hello -out spkac.cnfExample of an SPKAC, (long lines split up for clarity):
SPKAC=MIG5MGUwXDANBgkqhkiG9w0BAQEFAANLADBIAkEA1cCoq2Wa3Ixs47uI7F\ PVwHVIPDx5yso105Y6zpozam135a8R0CpoRvkkigIyXfcCjiVi5oWk+6FfPaD03u\ PFoQIDAQABFgVoZWxsbzANBgkqhkiG9w0BAQQFAANBAFpQtY/FojdwkJh1bEIYuc\ 2EeM2KHTWPEepWYeawvHD0gQ3DngSC75YCWnnDdq+NQ3F+X4deMx9AaEglZtULwV\ 4= NOTESA 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 ALSOca(1)
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