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= ROOT|Technical|Proxy_Docs|rfc2560.txt =

page 2 of 13




2.2  Response

   OCSP responses can be of various types.  An OCSP response consists of
   a response type and the bytes of the actual response. There is one
   basic type of OCSP response that MUST be supported by all OCSP
   servers and clients. The rest of this section pertains only to this
   basic response type.





 
RFC 2560                       PKIX OCSP                       June 1999


   All definitive response messages SHALL be digitally signed. The key
   used to sign the response MUST belong to one of the following:

   -- the CA who issued the certificate in question
   -- a Trusted Responder whose public key is trusted by the requester
   -- a CA Designated Responder (Authorized Responder) who holds a
      specially marked certificate issued directly by the CA, indicating
      that the responder may issue OCSP responses for that CA

   A definitive response message is composed of:

   -- version of the response syntax
   -- name of the responder
   -- responses for each of the certificates in a request
   -- optional extensions
   -- signature algorithm OID
   -- signature computed across hash of the response

   The response for each of the certificates in a request consists of

   -- target certificate identifier
   -- certificate status value
   -- response validity interval
   -- optional extensions

   This specification defines the following definitive response
   indicators for use in the certificate status value:

   -- good
   -- revoked
   -- unknown

   The "good" state indicates a positive response to the status inquiry.
   At a minimum, this positive response indicates that the certificate
   is not revoked, but does not necessarily mean that the certificate
   was ever issued or that the time at which the response was produced
   is within the certificate's validity interval. Response extensions
   may be used to convey additional information on assertions made by
   the responder regarding the status of the certificate such as
   positive statement about issuance, validity, etc.

   The "revoked" state indicates that the certificate has been revoked
   (either permanantly or temporarily (on hold)).

   The "unknown" state indicates that the responder doesn't know about
   the certificate being requested.






 
RFC 2560                       PKIX OCSP                       June 1999


2.3  Exception Cases

   In case of errors, the OCSP Responder may return an error message.
   These messages are not signed. Errors can be of the following types:

   -- malformedRequest
   -- internalError
   -- tryLater
   -- sigRequired
   -- unauthorized

   A server produces the "malformedRequest" response if the request
   received does not conform to the OCSP syntax.

   The response "internalError" indicates that the OCSP responder
   reached an inconsistent internal state. The query should be retried,
   potentially with another responder.

   In the event that the OCSP responder is operational, but unable to
   return a status for the requested certificate, the "tryLater"
   response can be used to indicate that the service exists, but is
   temporarily unable to respond.

   The response "sigRequired" is returned in cases where the server
   requires the client sign the request in order to construct a
   response.

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