Using the ECC Brainpool Curves for IKEv2 Key Exchange
draft-merkle-ikev2-ke-brainpool-04

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Last updated 2013-04-22 (latest revision 2013-04-11)
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IESG note Dan Harkins (dharkins@lounge.org) is the document shepherd.
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Network Working Group                                          J. Merkle
Internet-Draft                                 secunet Security Networks
Intended status: Informational                                M. Lochter
Expires: October 13, 2013               Bundesamt fuer Sicherheit in der
                                               Informationstechnik (BSI)
                                                          April 11, 2013

         Using the ECC Brainpool Curves for IKEv2 Key Exchange
                   draft-merkle-ikev2-ke-brainpool-04

Abstract

   This document specifies the use of ECC Brainpool elliptic curve
   groups for key exchange in the Internet Key Exchange version 2
   (IKEv2) protocol.

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   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1.  Requirements Language  . . . . . . . . . . . . . . . . . .  3
   2.  IKEv2 Key Exchange using the ECC Brainpool Curves  . . . . . .  4
     2.1.  Diffie-Hellman Group Transform IDs . . . . . . . . . . . .  4
     2.2.  Using the Twisted Brainpool Curves Internally  . . . . . .  4
     2.3.  Key Exchange Payload and Shared Secret . . . . . . . . . .  4
   3.  Security Considerations  . . . . . . . . . . . . . . . . . . .  6
   4.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  7
   5.  References . . . . . . . . . . . . . . . . . . . . . . . . . .  8
     5.1.  Normative References . . . . . . . . . . . . . . . . . . .  8
     5.2.  Informative References . . . . . . . . . . . . . . . . . .  8
   Appendix A.  Test Vectors  . . . . . . . . . . . . . . . . . . . . 10
     A.1.  224 Bit Curve  . . . . . . . . . . . . . . . . . . . . . . 10
     A.2.  256 Bit Curve  . . . . . . . . . . . . . . . . . . . . . . 11
     A.3.  384 Bit Curve  . . . . . . . . . . . . . . . . . . . . . . 11
     A.4.  512 Bit Curve  . . . . . . . . . . . . . . . . . . . . . . 12

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1.  Introduction

   In [RFC5639], a new set of elliptic curve groups over finite prime
   fields for use in cryptographic applications was specified.  These
   groups, denoted as ECC Brainpool curves, were generated in a
   verifiably pseudo-random way and comply with the security
   requirements of relevant standards from ISO [ISO1] [ISO2], ANSI
   [ANSI1], NIST [FIPS], and SecG [SEC2].

   While the ASN.1 object identifiers defined in RFC 5639 allow usage of
   the ECC Brainpool curves in certificates and certificate revocation
   lists, their utilization for key exchange in IKEv2 [RFC5996] requires
   the definition and assignment of additional Diffie-Hellman Group
   Transform IDs in the respective IANA registry.  This document
   specifies tranform IDs for four curves from RFC 5639 as well as the
   encoding of the key exchange payload and derivation of the shared
   secret when using one of these curves.

1.1.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
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