draft-ietf-lamps-5480-ku-clarifications-03.txt   rfc8813.txt 
LAMPS T. Ito Internet Engineering Task Force (IETF) T. Ito
Internet-Draft SECOM CO., LTD. Request for Comments: 8813 SECOM CO., LTD.
Updates: 5480 (if approved) S. Turner Updates: 5480 S. Turner
Intended status: Standards Track sn3rd Category: Standards Track sn3rd
Expires: September 30, 2020 March 31, 2020 ISSN: 2070-1721 August 2020
Clarifications for Elliptic Curve Cryptogtaphy Subject Public Key Clarifications for Elliptic Curve Cryptography Subject Public Key
Information Information
draft-ietf-lamps-5480-ku-clarifications-03
Abstract Abstract
This document updates RFC 5480 to specify semantics for the This document updates RFC 5480 to specify semantics for the
keyEncipherment and dataEncipherment key usage bits when used in keyEncipherment and dataEncipherment key usage bits when used in
certificates that support Elliptic Curve Cryptography. certificates that support Elliptic Curve Cryptography.
Status of This Memo Status of This Memo
This Internet-Draft is submitted in full conformance with the This is an Internet Standards Track document.
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
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Internet-Drafts are draft documents valid for a maximum of six months This document is a product of the Internet Engineering Task Force
and may be updated, replaced, or obsoleted by other documents at any (IETF). It represents the consensus of the IETF community. It has
time. It is inappropriate to use Internet-Drafts as reference received public review and has been approved for publication by the
material or to cite them other than as "work in progress." Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 7841.
This Internet-Draft will expire on September 30, 2020. 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/rfc8813.
Copyright Notice Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
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Table of Contents Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 1. Introduction
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Terminology
3. Updates to Section 3 . . . . . . . . . . . . . . . . . . . . 2 3. Updates to Section 3
4. Security Considerations . . . . . . . . . . . . . . . . . . . 3 4. Security Considerations
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3 5. IANA Considerations
6. Normative References . . . . . . . . . . . . . . . . . . . . 3 6. Normative References
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 3 Authors' Addresses
1. Introduction 1. Introduction
[RFC5480] specifies the syntax and semantics for the Subject Public [RFC5480] specifies the syntax and semantics for the Subject Public
Key Information field in certificates that support Elliptic Curve Key Information field in certificates that support Elliptic Curve
Cryptography. As part of these semantics, it defines what Cryptography. As part of these semantics, it defines what
combinations are permissible for the values of the key usage combinations are permissible for the values of the key usage
extension [RFC5280]. [RFC5480] specifies 7 of the 9 values; it extension [RFC5280]. [RFC5480] specifies 7 of the 9 values; it makes
makes no mention of keyEncipherment and dataEncipherment key usage no mention of the keyEncipherment and dataEncipherment key usage
bits. This document corrects this omission, by updating Section 3 of bits. This document corrects this omission by updating Section 3 of
[RFC5480] to make it clear that neither keyEncipherment nor the [RFC5480] to make it clear that neither keyEncipherment nor the
dataEncipherment key usage bits are set for key agreement algorithms dataEncipherment key usage bits are set for key agreement algorithms
defined therein. The additions are to be made to the end of defined therein. The additions are to be made to the end of
Section 3. Section 3 of [RFC5480].
2. Terminology 2. Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in BCP "OPTIONAL" in this document are to be interpreted as described in
14 [RFC2119] [RFC8174] when, and only when, they appear in all BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here. capitals, as shown here.
3. Updates to Section 3 3. Updates to Section 3
If the keyUsage extension is present in a certificate that indicates If the keyUsage extension is present in a certificate that indicates
id-ecPublicKey in SubjectPublicKeyInfo, then following values MUST id-ecPublicKey in SubjectPublicKeyInfo, then the following values
NOT be present: MUST NOT be present:
keyEncipherment; and keyEncipherment; and
dataEncipherment. dataEncipherment.
If the keyUsage extension is present in a certificate that indicates If the keyUsage extension is present in a certificate that indicates
id-ecDH or id-ecMQV in SubjectPublicKeyInfo, then the following id-ecDH or id-ecMQV in SubjectPublicKeyInfo, then the following
values also MUST NOT be present: values also MUST NOT be present:
keyEncipherment; and keyEncipherment; and
dataEncipherment. dataEncipherment.
4. Security Considerations 4. Security Considerations
This document introduces no new security considerations beyond those This document introduces no new security considerations beyond those
found in [RFC5480]. found in [RFC5480].
5. IANA Considerations 5. IANA Considerations
This document makes no request of IANA. This document has no IANA actions.
6. Normative References 6. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997, <https://www.rfc- DOI 10.17487/RFC2119, March 1997,
editor.org/info/rfc2119>. <https://www.rfc-editor.org/info/rfc2119>.
[RFC5280] Cooper, D., Santesson, S., Farrell, S., Boeyen, S., [RFC5280] Cooper, D., Santesson, S., Farrell, S., Boeyen, S.,
Housley, R., and W. Polk, "Internet X.509 Public Key Housley, R., and W. Polk, "Internet X.509 Public Key
Infrastructure Certificate and Certificate Revocation List Infrastructure Certificate and Certificate Revocation List
(CRL) Profile", RFC 5280, DOI 10.17487/RFC5280, May 2008, (CRL) Profile", RFC 5280, DOI 10.17487/RFC5280, May 2008,
<https://www.rfc-editor.org/info/rfc5280>. <https://www.rfc-editor.org/info/rfc5280>.
[RFC5480] Turner, S., Brown, D., Yiu, K., Housley, R., and T. Polk, [RFC5480] Turner, S., Brown, D., Yiu, K., Housley, R., and T. Polk,
"Elliptic Curve Cryptography Subject Public Key "Elliptic Curve Cryptography Subject Public Key
Information", RFC 5480, DOI 10.17487/RFC5480, March 2009, Information", RFC 5480, DOI 10.17487/RFC5480, March 2009,
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