RFC 9373 PROPOSED STANDARD DNS · IPSEC · EDDSA
EdDSA for IPSECKEY: EdDSA Value for IPSECKEY
An IPSECKEY registry value for EdDSA public keys stored in DNS.
RFC EDITOR
Moskowitz, R., Kivinen, T., and M. Richardson, "EdDSA Value for IPSECKEY", RFC 9373, DOI 10.17487/RFC9373, March 2023, <https://www.rfc-editor.org/info/rfc9373>.
BIBTEX
@misc{rfc9373,
series = {Request for Comments},
number = 9373,
howpublished = {RFC 9373},
publisher = {RFC Editor},
doi = {10.17487/RFC9373},
url = {https://www.rfc-editor.org/info/rfc9373},
author = {R. Moskowitz and T. Kivinen and M. Richardson},
title = {{EdDSA Value for IPSECKEY}},
pagetotal = 5,
year = 2023,
month = mar,
} RFC text
Contents
Internet Engineering Task Force (IETF) R. Moskowitz
Request for Comments: 9373 HTT Consulting
Category: Standards Track T. Kivinen
ISSN: 2070-1721
M. Richardson
Sandelman
March 2023
EdDSA Value for IPSECKEY
Abstract
This document assigns a value for Edwards-Curve Digital Signature
Algorithm (EdDSA) Public Keys to the "IPSECKEY Resource Record
Parameters" registry.
Status of This Memo
This is an Internet Standards Track document.
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). Further information on
Internet Standards is available in 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/rfc9373.
Copyright Notice
Copyright (c) 2023 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 Revised BSD License text as described in Section 4.e of the
Trust Legal Provisions and are provided without warranty as described
in the Revised BSD License.
Table of Contents
1. Introduction
2. IPSECKEY Support for EdDSA
3. IANA Considerations
3.1. Update to the IANA IPSECKEY Registry
3.1.1. Reformat the Algorithm Type Field Registry
3.1.2. Add to the Algorithm Type Field Registry
4. Security Considerations
5. References
5.1. Normative References
5.2. Informative References
Appendix A. IPSECKEY EdDSA Example
Acknowledgments
Authors' Addresses
1. Introduction
IPSECKEY [RFC4025] is a resource record (RR) for the Domain Name
System (DNS) that is used to store public keys for use in IP security
(IPsec) systems. The IPSECKEY RR relies on the IPSECKEY "Algorithm
Type Field" registry [IANA-IPSECKEY] to enumerate the permissible
formats for the public keys.
This document adds support for Edwards-Curve Digital Security
Algorithm (EdDSA) public keys in the format defined in [RFC8080] to
the IPSECKEY RR.
2. IPSECKEY Support for EdDSA
When using the EdDSA public key in the IPSECKEY RR, the value 4 is
used as an algorithm and the public key is formatted as specified in
"Edwards-Curve Digital Security Algorithm (EdDSA) for DNSSEC"
(Section 3 of [RFC8080]).
+=======+=====================+======================+===========+
| Value | Description | Format Description | Reference |
+=======+=====================+======================+===========+
| 4 | An EdDSA Public Key | [RFC8080], Section 3 | This RFC |
+-------+---------------------+----------------------+-----------+
Table 1
3. IANA Considerations
3.1. Update to the IANA IPSECKEY Registry
3.1.1. Reformat the Algorithm Type Field Registry
Per this document, IANA has added the "Format Description" field to
the "Algorithm Type Field" registry of the "IPSECKEY Resource Record
Parameters" [IANA-IPSECKEY]. In addition, IANA has updated the
"Description" field in existing entries of that registry to
explicitly state that they are for "Public" keys:
+=======+==========================+====================+===========+
| Value | Description | Format Description | Reference |
+=======+==========================+====================+===========+
| 0 | No Public key | | [RFC4025] |
| | is present | | |
+-------+--------------------------+--------------------+-----------+
| 1 | A DSA Public | [RFC2536], | [RFC4025] |
| | Key | Section 2 | |
+-------+--------------------------+--------------------+-----------+
| 2 | An RSA Public | [RFC3110], | [RFC4025] |
| | Key | Section 2 | |
+-------+--------------------------+--------------------+-----------+
| 3 | An ECDSA | [RFC6605], | [RFC8005] |
| | Public Key | Section 4 | |
+-------+--------------------------+--------------------+-----------+
Table 2
IANA added a reference to this document to the "Algorithm Type Field"
registry.
3.1.2. Add to the Algorithm Type Field Registry
Further, IANA has made the following addition to the "Algorithm Type
Field" registry within the "IPSECKEY Resource Record Parameters"
[IANA-IPSECKEY]:
+=======+=====================+======================+===========+
| Value | Description | Format Description | Reference |
+=======+=====================+======================+===========+
| 4 | An EdDSA Public Key | [RFC8080], Section 3 | This RFC |
+-------+---------------------+----------------------+-----------+
Table 3
4. Security Considerations
The security considerations discussed in [RFC4025] apply. This
document does not introduce any new security considerations.
5. References
5.1. Normative References
[IANA-IPSECKEY]
IANA, "IPSECKEY Resource Record Parameters",
<https://www.iana.org/assignments/ipseckey-rr-parameters>.
[RFC8080] Sury, O. and R. Edmonds, "Edwards-Curve Digital Security
Algorithm (EdDSA) for DNSSEC", RFC 8080,
DOI 10.17487/RFC8080, February 2017,
<https://www.rfc-editor.org/info/rfc8080>.
5.2. Informative References
[RFC2536] Eastlake 3rd, D., "DSA KEYs and SIGs in the Domain Name
System (DNS)", RFC 2536, DOI 10.17487/RFC2536, March 1999,
<https://www.rfc-editor.org/info/rfc2536>.
[RFC3110] Eastlake 3rd, D., "RSA/SHA-1 SIGs and RSA KEYs in the
Domain Name System (DNS)", RFC 3110, DOI 10.17487/RFC3110,
May 2001, <https://www.rfc-editor.org/info/rfc3110>.
[RFC4025] Richardson, M., "A Method for Storing IPsec Keying
Material in DNS", RFC 4025, DOI 10.17487/RFC4025, March
2005, <https://www.rfc-editor.org/info/rfc4025>.
[RFC6605] Hoffman, P. and W.C.A. Wijngaards, "Elliptic Curve Digital
Signature Algorithm (DSA) for DNSSEC", RFC 6605,
DOI 10.17487/RFC6605, April 2012,
<https://www.rfc-editor.org/info/rfc6605>.
[RFC8005] Laganier, J., "Host Identity Protocol (HIP) Domain Name
System (DNS) Extension", RFC 8005, DOI 10.17487/RFC8005,
October 2016, <https://www.rfc-editor.org/info/rfc8005>.
Appendix A. IPSECKEY EdDSA Example
The following is an example of an IPSECKEY RR with no gateway, and an
EdDSA public key. It uses the IPSECKEY presentation format which is
base64.
foo.example.com. IN IPSECKEY (
10 0 4 . 3WTXgUvpn1RlCXnm80gGY2LZ/ErUUEZtZ33IDi8yfhM= )
The associated EdDSA private key (in hex) is as follows:
c7be71a45cbf87785f639dc4fd1c82637c21b5e02488939976ece32b9268d0b7
Acknowledgments
Thanks to the Security Area Director, Paul Wouters, for his initial
review. Also, thanks to Security Area Director, Roman Danyliw, for
his final reviews and document shepherding.
Authors' Addresses
Robert Moskowitz
HTT Consulting
Oak Park, MI 48237
United States of America
Email: rgm@labs.htt-consult.com
Tero Kivinen
Email: kivinen@iki.fi
Michael C. Richardson
Sandelman Software Works
Email: mcr+ietf@sandelman.ca
URI: https://www.sandelman.ca/
ISO Plain Language
On this page
PROBLEMIPSECKEY records need an assigned algorithm value so their algorithm field can identify an EdDSA public key format.
MECHANISMThe RFC assigns value 4 to EdDSA keys and points to RFC 8080 for the public-key format.
A REGISTERED KEY TYPEDNS IPSECKEY records can identify EdDSA public keys for IPsec use through the updated IANA registry entry.
§1Adding EdDSA to IPSECKEY
IPSECKEY is a DNS resource record used to store public keys for IPsec systems. Its algorithm type field uses a registry to identify permitted public-key formats.
This RFC adds support for EdDSA public keys in the format defined by RFC 8080 and updates the registry information for IPSECKEY algorithm types.
An IPSECKEY record stores a public key that IPsec systems can use. This RFC adds a registry value that identifies an EdDSA key.
§2The EdDSA Algorithm Value
When an IPSECKEY resource record contains an EdDSA public key, the algorithm field uses value 4. The key itself is formatted as specified in section 3 of RFC 8080.
The RFC also adds a Format Description field to the algorithm registry and updates existing descriptions to identify the entries as public-key formats.
The number 4 tells a reader that the IPSECKEY data contains an EdDSA public key. The referenced specification defines how to encode that key.
§3Registry Updates and Security
IANA added the EdDSA Public Key entry with value 4 and a reference to RFC 8080. The registry also gained a Format Description field, and existing descriptions were clarified to say when they identify public keys.
The RFC says the security considerations of RFC 4025 apply and that this registry update introduces no new security considerations.
The registry now lists EdDSA as an allowed IPSECKEY key format. The RFC relies on the existing IPSECKEY security guidance.