CBOR Encoding of X.509 Certificates (CBOR Certificates)
draft-mattsson-cose-cbor-cert-compress-04

Document Type Active Internet-Draft (individual)
Authors Shahid Raza  , Joel Höglund  , Göran Selander  , John Preuß Mattsson  , Martin Furuhed 
Last updated 2020-11-24
Replaces draft-raza-ace-cbor-certificates, draft-mattsson-tls-cbor-cert-compress
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Network Working Group                                            S. Raza
Internet-Draft                                               J. Hoeglund
Intended status: Standards Track                                 RISE AB
Expires: May 28, 2021                                        G. Selander
                                                             J. Mattsson
                                                             Ericsson AB
                                                              M. Furuhed
                                                             Nexus Group
                                                       November 24, 2020

        CBOR Encoding of X.509 Certificates (CBOR Certificates)
               draft-mattsson-cose-cbor-cert-compress-04

Abstract

   This document specifies a CBOR encoding of PKIX profiled X.509
   Certificates.  The resulting certificates are called "CBOR
   certificates".  The CBOR encoding supports a large subset of RFC
   5280, while at the same time producing very small sizes for
   certificates compatible with RFC 7925.  The CBOR encoding can be used
   to compress DER encoded X.509 certificates and to encode natively
   signed certificates.  When uses to compress DER encoded X.509
   certificates, the CBOR encoding can in many cases compress RFC 7925
   profiled certificates with over 50%. The document also specifies COSE
   headers for CBOR certificates as well as a TLS certificate type for
   CBOR certificates.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on May 28, 2021.

Raza, et al.              Expires May 28, 2021                  [Page 1]
Internet-DraftCBOR Encoding of X.509 Certificates (CBOR CerNovember 2020

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Notational Conventions  . . . . . . . . . . . . . . . . . . .   4
   3.  CBOR Encoding . . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Message Fields  . . . . . . . . . . . . . . . . . . . . .   5
     3.2.  Encoding of Extensions  . . . . . . . . . . . . . . . . .   8
   4.  Compliance Requirements for Constrained IoT . . . . . . . . .  10
   5.  Deployment settings . . . . . . . . . . . . . . . . . . . . .  10
   6.  Expected Certificate Sizes  . . . . . . . . . . . . . . . . .  11
   7.  Natively Signed CBOR Certificates . . . . . . . . . . . . . .  11
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
     9.1.  CBOR Certificate Types Registry . . . . . . . . . . . . .  12
     9.2.  CBOR Attribute Type Registry  . . . . . . . . . . . . . .  12
     9.3.  CBOR Extension Type Registry  . . . . . . . . . . . . . .  13
     9.4.  CBOR Extended Key Usage Registry  . . . . . . . . . . . .  14
     9.5.  CBOR Subject Alternative Name Registry  . . . . . . . . .  15
     9.6.  CBOR Certificate Signature Algorithms Registry  . . . . .  15
     9.7.  CBOR Certificate Public Key Algorithms Registry . . . . .  16
     9.8.  COSE Header Parameters Registry . . . . . . . . . . . . .  17
     9.9.  TLS Certificate Types Registry  . . . . . . . . . . . . .  18
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  18
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  18
     10.2.  Informative References . . . . . . . . . . . . . . . . .  19
   Appendix A.  Example CBOR Certificates  . . . . . . . . . . . . .  20
     A.1.  Example RFC 7925 profiled X.509 Certificate . . . . . . .  20
     A.2.  Example HTPPS X.509 Certificate . . . . . . . . . . . . .  23
   Appendix B.  X.509 Certificate Profile, ASN.1 . . . . . . . . . .  26
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