Clarifications for Elliptic Curve Cryptogtaphy Subject Public Key Information
draft-ietf-lamps-5480-ku-clarifications-03

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Last updated 2020-05-26 (latest revision 2020-03-31)
Replaces draft-turner-5480-ku-clarifications
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LAMPS                                                             T. Ito
Internet-Draft                                           SECOM CO., LTD.
Updates: 5480 (if approved)                                    S. Turner
Intended status: Standards Track                                   sn3rd
Expires: September 30, 2020                               March 31, 2020

   Clarifications for Elliptic Curve Cryptogtaphy Subject Public Key
                              Information
               draft-ietf-lamps-5480-ku-clarifications-03

Abstract

   This document updates RFC 5480 to specify semantics for the
   keyEncipherment and dataEncipherment key usage bits when used in
   certificates that support Elliptic Curve Cryptography.

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
   Task Force (IETF).  Note that other groups may also distribute
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   This Internet-Draft will expire on September 30, 2020.

Copyright Notice

   Copyright (c) 2020 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
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Updates to Section 3  . . . . . . . . . . . . . . . . . . . .   2
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
   6.  Normative References  . . . . . . . . . . . . . . . . . . . .   3
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   3

1.  Introduction

   [RFC5480] specifies the syntax and semantics for the Subject Public
   Key Information field in certificates that support Elliptic Curve
   Cryptography.  As part of these semantics, it defines what
   combinations are permissible for the values of the key usage
   extension [RFC5280].  [RFC5480] specifies 7 of the 9 values; it
   makes no mention of keyEncipherment and dataEncipherment key usage
   bits.  This document corrects this omission, by updating Section 3 of
   [RFC5480] to make it clear that neither keyEncipherment nor the
   dataEncipherment key usage bits are set for key agreement algorithms
   defined therein.  The additions are to be made to the end of
   Section 3.

2.  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.

3.  Updates to Section 3

   If the keyUsage extension is present in a certificate that indicates
   id-ecPublicKey in SubjectPublicKeyInfo, then following values MUST
   NOT be present:

     keyEncipherment; and
     dataEncipherment.

   If the keyUsage extension is present in a certificate that indicates
   id-ecDH or id-ecMQV in SubjectPublicKeyInfo, then the following
   values also MUST NOT be present:

     keyEncipherment; and
     dataEncipherment.

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4.  Security Considerations

   This document introduces no new security considerations beyond those
   found in [RFC5480].

5.  IANA Considerations

   This document makes no request of IANA.

6.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997, <https://www.rfc-
              editor.org/info/rfc2119>.

   [RFC5280]  Cooper, D., Santesson, S., Farrell, S., Boeyen, S.,
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