Edwards-Curve Digital Security Algorithm (EdDSA) for DNSSEC
RFC 8080

Document Type RFC - Proposed Standard (February 2017; Errata)
Last updated 2017-02-16
Replaces draft-ietf-curdle-dnskey-ed448, draft-ietf-curdle-dnskey-ed25519
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Internet Engineering Task Force (IETF)                           O. Sury
Request for Comments: 8080                                        CZ.NIC
Category: Standards Track                                     R. Edmonds
ISSN: 2070-1721                                                   Fastly
                                                           February 2017

      Edwards-Curve Digital Security Algorithm (EdDSA) for DNSSEC

Abstract

   This document describes how to specify Edwards-curve Digital Security
   Algorithm (EdDSA) keys and signatures in DNS Security (DNSSEC).  It
   uses EdDSA with the choice of two curves: Ed25519 and Ed448.

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
   http://www.rfc-editor.org/info/rfc8080.

Copyright Notice

   Copyright (c) 2017 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
   (http://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 Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Sury & Edmonds               Standards Track                    [Page 1]
RFC 8080                    EdDSA for DNSSEC               February 2017

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   2
   3.  DNSKEY Resource Records . . . . . . . . . . . . . . . . . . .   2
   4.  RRSIG Resource Records  . . . . . . . . . . . . . . . . . . .   3
   5.  Algorithm Number for DS, DNSKEY, and RRSIG Resource Records .   3
   6.  Examples  . . . . . . . . . . . . . . . . . . . . . . . . . .   3
     6.1.  Ed25519 Examples  . . . . . . . . . . . . . . . . . . . .   3
     6.2.  Ed448 Examples  . . . . . . . . . . . . . . . . . . . . .   4
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   7
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   DNSSEC, which is broadly defined in [RFC4033], [RFC4034], and
   [RFC4035], uses cryptographic keys and digital signatures to provide
   authentication of DNS data.  Currently, the most popular signature
   algorithm in use is RSA.  GOST [RFC5933] and NIST-specified elliptic
   curve cryptography [RFC6605] are also standardized.

   [RFC8032] describes the elliptic curve signature system Edwards-curve
   Digital Signature Algorithm (EdDSA) and recommends two curves,
   Ed25519 and Ed448.

   This document defines the use of DNSSEC's DS, DNSKEY, and RRSIG
   resource records (RRs) with a new signing algorithm, EdDSA, using a
   choice of two curves: Ed25519 and Ed448.

2.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

3.  DNSKEY Resource Records

   An Ed25519 public key consists of a 32-octet value, which is encoded
   into the Public Key field of a DNSKEY resource record as a simple bit
   string.  The generation of a public key is defined in Section 5.1.5
   of [RFC8032].

Sury & Edmonds               Standards Track                    [Page 2]
RFC 8080                    EdDSA for DNSSEC               February 2017

   An Ed448 public key consists of a 57-octet value, which is encoded
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