pki-ocsp binary package in Ubuntu Bionic amd64

 Certificate System (CS) is an enterprise software system designed
 to manage enterprise Public Key Infrastructure (PKI) deployments.
 .
 The Online Certificate Status Protocol (OCSP) Manager is an optional PKI
 subsystem that can act as a stand-alone OCSP service. The OCSP Manager
 performs the task of an online certificate validation authority by enabling
 OCSP-compliant clients to do real-time verification of certificates. Note
 that an online certificate-validation authority is often referred to as an
 OCSP Responder.
 .
 Although the Certificate Authority (CA) is already configured with an
 internal OCSP service. An external OCSP Responder is offered as a separate
 subsystem in case the user wants the OCSP service provided outside of a
 firewall while the CA resides inside of a firewall, or to take the load of
 requests off of the CA.
 .
 The OCSP Manager can receive Certificate Revocation Lists (CRLs) from
 multiple CA servers, and clients can query the OCSP Manager for the
 revocation status of certificates issued by all of these CA servers.
 .
 When an instance of OCSP Manager is set up with an instance of CA, and
 publishing is set up to this OCSP Manager, CRLs are published to it
 whenever they are issued or updated.

Source package