Signature Authentication in the Internet Key Exchange Version 2 (IKEv2)
RFC 7427

Document Type RFC - Proposed Standard (January 2015; Errata)
Updates RFC 7296
Last updated 2015-10-14
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Internet Engineering Task Force (IETF)                        T. Kivinen
Request for Comments: 7427                                 INSIDE Secure
Updates: 7296                                                  J. Snyder
Category: Standards Track                                       Opus One
ISSN: 2070-1721                                             January 2015

Signature Authentication in the Internet Key Exchange Version 2 (IKEv2)

Abstract

   The Internet Key Exchange Version 2 (IKEv2) protocol has limited
   support for the Elliptic Curve Digital Signature Algorithm (ECDSA).
   The current version only includes support for three Elliptic Curve
   groups, and there is a fixed hash algorithm tied to each group.  This
   document generalizes IKEv2 signature support to allow any signature
   method supported by PKIX and also adds signature hash algorithm
   negotiation.  This is a generic mechanism and is not limited to
   ECDSA; it can also be used with other signature algorithms.

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 5741.

   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/rfc7427.

Copyright Notice

   Copyright (c) 2015 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.

Kivinen & Snyder             Standards Track                    [Page 1]
RFC 7427            Signature Authentication in IKEv2       January 2015

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Authentication Payload  . . . . . . . . . . . . . . . . . . .   4
   4.  Hash Algorithm Notification . . . . . . . . . . . . . . . . .   6
   5.  Selecting the Public Key Algorithm  . . . . . . . . . . . . .   7
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  10
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  10
   Appendix A.  Commonly Used ASN.1 Objects  . . . . . . . . . . . .  12
     A.1.  PKCS#1 1.5 RSA Encryption . . . . . . . . . . . . . . . .  12
       A.1.1.  sha1WithRSAEncryption . . . . . . . . . . . . . . . .  12
       A.1.2.  sha256WithRSAEncryption . . . . . . . . . . . . . . .  12
       A.1.3.  sha384WithRSAEncryption . . . . . . . . . . . . . . .  13
       A.1.4.  sha512WithRSAEncryption . . . . . . . . . . . . . . .  13
     A.2.  DSA . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
       A.2.1.  dsa-with-sha1 . . . . . . . . . . . . . . . . . . . .  13
       A.2.2.  dsa-with-sha256 . . . . . . . . . . . . . . . . . . .  14
     A.3.  ECDSA . . . . . . . . . . . . . . . . . . . . . . . . . .  14
       A.3.1.  ecdsa-with-sha1 . . . . . . . . . . . . . . . . . . .  14
       A.3.2.  ecdsa-with-sha256 . . . . . . . . . . . . . . . . . .  14
       A.3.3.  ecdsa-with-sha384 . . . . . . . . . . . . . . . . . .  15
       A.3.4.  ecdsa-with-sha512 . . . . . . . . . . . . . . . . . .  15
     A.4.  RSASSA-PSS  . . . . . . . . . . . . . . . . . . . . . . .  15
       A.4.1.  RSASSA-PSS with Empty Parameters  . . . . . . . . . .  15
       A.4.2.  RSASSA-PSS with Default Parameters  . . . . . . . . .  16
       A.4.3.  RSASSA-PSS with SHA-256 . . . . . . . . . . . . . . .  17
   Appendix B.  IKEv2 Payload Example  . . . . . . . . . . . . . . .  17
     B.1.  sha1WithRSAEncryption . . . . . . . . . . . . . . . . . .  17
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  18
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  18

1.  Introduction

   This document adds a new IKEv2 [RFC7296] authentication method to
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