Clarifications for Elliptic Curve Cryptogtaphy Subject Public Key Information
draft-turner-5480-ku-clarifications-01
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TBD T. Ito
Internet-Draft SECOM CO., LTD.
Updates: 5480 (if approved) S. Turner
Intended status: Standards Track sn3rd
Expires: February 14, 2020 August 13, 2019
Clarifications for Elliptic Curve Cryptogtaphy Subject Public Key
Information
draft-turner-5480-ku-clarifications-01
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.
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This Internet-Draft will expire on February 14, 2020.
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
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Internet-Draft Clarifications for ECC SPKI August 2019
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
extensions [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.
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 as algorithm of AlgorithmIdentifier [RFC2986] 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>.
[RFC2986] Nystrom, M. and B. Kaliski, "PKCS #10: Certification
Request Syntax Specification Version 1.7", RFC 2986,
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