RFC.4211 - pkix - Certificate Request Message Format (CRMF)
This document describes the Certificate Request Message Format (CRMF)
syntax and semantics. This syntax is used to convey a request for a
certificate to a Certification Authority (CA), possibly via a
Registration Authority (RA), for the purposes of X.509 certificate
production. The request will typically include a public key and the
associated registration information. This document does not define a
certificate request protocol.