4. Coexistence with Existing Implementations

This section preserves the RFC text for EST CSR Attributes, including CSR attribute OIDs and values, ASN.1 syntax, id-ExtensionReq, CertificationRequestInfoTemplate, Base64 examples, ASN.1 dump output, IANA registrations, and security considerations.

Original RFC Text

4.  Coexistence with Existing Implementations

   EST servers with legacy clients MAY continue to use the unstructured
   list of attribute/value pairs as described in [RFC7030] and MAY also
   include the template style described in Section 3.4 for newer
   clients.  Clients that understand both MUST use the template only,
   and ignore all other CsrAttrs elements.  Older clients will ignore
   the new CertificationRequestInfoTemplate element.