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Versions: 00 draft-ietf-curdle-pkix

Network Working Group                                       S. Josefsson
Internet-Draft                                                    SJD AB
Intended status: Informational                            March 20, 2016
Expires: September 21, 2016

                 Using Curve25519 and Curve448 in PKIX


   This document specify "named curve" object identifiers for the
   Curve25519 and Curve448 curves, for use in various X.509 PKIX

Status of This Memo

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

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   This Internet-Draft will expire on September 21, 2016.

Copyright Notice

   Copyright (c) 2016 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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1.  Introduction

   In [RFC7748], the elliptic curves Curve25519 and Curve448 are
   described.  They are designed with performance and security in mind.
   The curves may be used for Diffie-Hellman and Digital Signature

   This RFC define ASN.1 "named curve" object identifiers for Curve25519
   and Curve448, for use in the Internet X.509 PKI [RFC5280].

   Rather than defining a new subject public key format for these two
   curves, this document re-use the existing ECDSA/ECDH public-key
   contained (described in section 2.3.5 of [RFC3279]) and introduce two
   new "named curve" OIDs.  This approach is the same as for the
   Brainpool curves [RFC5639].

2.  Requirements Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   document are to be interpreted as described in [RFC2119].

3.  Curve25519 and Curve448 Named Curve Identifier

   Certificates conforming to [RFC5280] may convey a public key for any
   public key algorithm.  The certificate indicates the algorithm
   through an algorithm identifier.  This algorithm identifier is an OID
   and optionally associated parameters.  Section 2.3.5 of [RFC3279]
   describe ECDSA/ECDH public keys, specifying the id-ecPublicKey OID.
   This OID has the associated EcpkParameters parameters structure,
   which contains the namedCurve CHOICE.  Here we introduce two new OIDs
   for use in the namedCurve field.

       id-Curve25519   OBJECT IDENTIFIER ::= { }
       id-Curve448     OBJECT IDENTIFIER ::= { }
       id-Curve25519ph OBJECT IDENTIFIER ::= { }
       id-Curve448ph   OBJECT IDENTIFIER ::= { }

   The OID id-Curve25519 refers to Curve25519.  The OID id-Curve448
   refers to Curve448.  Both curves are described in [RFC7748].  The
   OIDs id-Curve25519ph and id-Curve448ph refers to Curve25519 and
   Curve448 when used with pre-hashing as Ed25519ph and Ed448ph
   described in [I-D.irtf-cfrg-eddsa].

   The public key value encoded into the ECPoint value is the raw binary
   values described in [RFC7748].

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4.  Acknowledgements

   Text and/or inspiration were drawn from [RFC5280], [RFC3279],
   [RFC5480], and [RFC5639].

   Several people suggested the utility of specifying OIDs for encoding
   Curve25519/Curve448 public keys into PKIX certificates, the editor of
   this document cannot take credit for this idea.

5.  IANA Considerations


6.  Security Considerations

   The security considerations of [RFC3279], [RFC5280], [RFC5480] and
   [RFC7748] apply accordingly.

7.  References

7.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC3279]  Bassham, L., Polk, W., and R. Housley, "Algorithms and
              Identifiers for the Internet X.509 Public Key
              Infrastructure Certificate and Certificate Revocation List
              (CRL) Profile", RFC 3279, April 2002.

   [RFC5280]  Cooper, D., Santesson, S., Farrell, S., Boeyen, S.,
              Housley, R., and W. Polk, "Internet X.509 Public Key
              Infrastructure Certificate and Certificate Revocation List
              (CRL) Profile", RFC 5280, May 2008.

   [RFC5480]  Turner, S., Brown, D., Yiu, K., Housley, R., and T. Polk,
              "Elliptic Curve Cryptography Subject Public Key
              Information", RFC 5480, March 2009.

   [RFC7748]  Langley, A., Hamburg, M., and S. Turner, "Elliptic Curves
              for Security", RFC 7748, DOI 10.17487/RFC7748, January
              2016, <http://www.rfc-editor.org/info/rfc7748>.

              Josefsson, S. and I. Liusvaara, "Edwards-curve Digital
              Signature Algorithm (EdDSA)", draft-irtf-cfrg-eddsa-00
              (work in progress), October 2015.

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7.2.  Informative References

   [RFC5639]  Lochter, M. and J. Merkle, "Elliptic Curve Cryptography
              (ECC) Brainpool Standard Curves and Curve Generation", RFC
              5639, March 2010.

Author's Address

   Simon Josefsson

   Email: simon@josefsson.org

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