Using Edwards-curve Digital Signature Algorithm (EdDSA) in the Internet Key Exchange (IKEv2)
draft-ietf-ipsecme-eddsa-03

Document Type Active Internet-Draft (ipsecme WG)
Last updated 2017-04-15
Replaces draft-nir-ipsecme-eddsa
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Send notices to "Tero Kivinen" <kivinen@iki.fi>
IPSecME Working Group                                             Y. Nir
Internet-Draft                                               Check Point
Intended status: Standards Track                          April 15, 2017
Expires: October 17, 2017

Using Edwards-curve Digital Signature Algorithm (EdDSA) in the Internet
                          Key Exchange (IKEv2)
                      draft-ietf-ipsecme-eddsa-03

Abstract

   This document describes the use of the Edwards-curve digital
   signature algorithm in the IKEv2 protocol.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on October 17, 2017.

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
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Conventions Used in This Document . . . . . . . . . . . .   3
   2.  The "Identity" Hash Identifier  . . . . . . . . . . . . . . .   3
   3.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
   5.  Normative References  . . . . . . . . . . . . . . . . . . . .   3
   Appendix A.  ASN.1 Objects  . . . . . . . . . . . . . . . . . . .   5
     A.1.  ASN.1 Object for Ed25519  . . . . . . . . . . . . . . . .   5
     A.2.  ASN.1 Object for Ed448  . . . . . . . . . . . . . . . . .   5
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   The Internet Key Exchange protocol [RFC7296] can use arbitrary
   signature algorithms as described in [RFC7427].  The latter RFC
   defines the SIGNATURE_HASH_ALGORITHMS notification where each side of
   the IKE negotiation lists its supported hash algorithms.  This
   assumes that all signature schemes involve a hashing phase followed
   by a signature phase.  This made sense because most signature
   algorithms either cannot sign messages bigger than their key or
   truncate messages bigger than their key.

   EdDSA ([RFC8032]) defines signature methods that do not require pre-
   hashing of the message.  Unlike other methods, these accept
   arbitrary-sized messages, so no pre-hashing is required.  These
   methods are called Ed25519 and Ed448, which respectively use the
   Edwards 25519 and the Edwards 448 ("Goldilocks") curves.  Although
   that document also defines pre-hashed versions of these algorithm,
   those versions are not recommended for protocols where the entire to-
   be-signed message is available at once.  See section 8.5 or RFC 8032
   for that recommendation.

   EdDSA defines the binary format of the signatures that should be used
   in the "Signature Value" field of the Authentication Data Format in
   section 3.  The CURDLE PKIX document ([I.D-curdle-pkix]) defines the
   object identifiers (OIDs) for these signature methods.  For
   convenience, these OIDs are repeated in Appendix A.

   In order to signal within IKE that no hashing needs to be done, we
   define a new value has in the SIGNATURE_HASH_ALGORITHMS notification,
   one that indicates that no hashing is performed.

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1.1.  Conventions Used in This Document

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
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