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
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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/
