http://www.rfc-editor.org/rfc/rfc4211.txt
RFC 4211: Internet X.509 Public Key Infrastructure Certificate Request Message Format (CRMF), J. Schaad2005-09-01T23:00:00-00:00This 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. [STANDARDS-TRACK]