Hash Of Root Key Certificate Extension
RFC 8649

Document Type RFC - Informational (August 2019; No errata)
Last updated 2019-08-26
Replaces draft-housley-hash-of-root-key-cert-extn
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Tim Hollebeek
Shepherd write-up Show (last changed 2018-11-28)
IESG IESG state RFC 8649 (Informational)
Consensus Boilerplate Yes
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Responsible AD Roman Danyliw
Send notices to Tim Hollebeek <tim.hollebeek@digicert.com>
IANA IANA review state Version Changed - Review Needed
IANA action state No IANA Actions
Internet Engineering Task Force (IETF)                        R. Housley
Request for Comments: 8649                                Vigil Security
Category: Informational                                      August 2019
ISSN: 2070-1721

                 Hash Of Root Key Certificate Extension

Abstract

   This document specifies the Hash Of Root Key certificate extension.
   This certificate extension is carried in the self-signed certificate
   for a trust anchor, which is often called a Root Certification
   Authority (CA) certificate.  This certificate extension unambiguously
   identifies the next public key that will be used at some point in the
   future as the next Root CA certificate, eventually replacing the
   current one.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Not all documents
   approved by the IESG are candidates for any level of Internet
   Standard; see Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8649.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Housley                       Informational                     [Page 1]
RFC 8649               Hash Of Root Key Extension            August 2019

Table of Contents

   1. Introduction ....................................................2
      1.1. Terminology ................................................2
      1.2. ASN.1 ......................................................3
   2. Overview ........................................................3
   3. Hash Of Root Key Certificate Extension ..........................4
   4. IANA Considerations .............................................4
   5. Operational Considerations ......................................4
   6. Security Considerations .........................................6
   7. References ......................................................7
      7.1. Normative References .......................................7
      7.2. Informative References .....................................8
   Appendix A.  ASN.1 Module ..........................................9
   Acknowledgements ..................................................10
   Author's Address ..................................................10

1.  Introduction

   This document specifies the Hash Of Root Key X.509 version 3
   certificate extension.  The extension is an optional addition to the
   Internet X.509 Public Key Infrastructure Certificate and Certificate
   Revocation List (CRL) Profile [RFC5280].  The certificate extension
   facilitates the orderly transition from one Root Certification
   Authority (CA) public key to the next.  It does so by publishing the
   hash value of the next-generation public key in the current self-
   signed certificate.  This hash value is a commitment to a particular
   public key in the next-generation self-signed certificate.  This
   commitment allows a relying party to unambiguously recognize the
   next-generation self-signed certificate when it becomes available,
   install the new self-signed certificate in the trust anchor store,
   and eventually remove the previous one from the trust anchor store.

   A Root CA certificate MAY include the Hash Of Root Key certificate
   extension to provide the hash value of the next public key that will
   be used by the Root CA.

1.1.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in
   BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

Housley                       Informational                     [Page 2]
RFC 8649               Hash Of Root Key Extension            August 2019

1.2.  ASN.1

   Certificates [RFC5280] use ASN.1 [X680]; Distinguished Encoding Rules
   (DER) [X690] are REQUIRED for certificate signing and validation.
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