Network Working Group                                          S. Turner
Internet-Draft                                                      IECA
Updates: 6033 (once approved)                          December 22, 2010
Intended status: Standards Track
Expires: June 22, 2011



    Elliptic Curve Algorithms for Cryptographic Message Syntax (CMS)
                   Encrypted Key Package Content Type
                 draft-turner-ekpct-algs-update-02.txt

Abstract

   This document describes the conventions for using several Elliptic
   Curve cryptographic algorithms with the Cryptographic Message Syntax
   (CMS) encrypted key package content type. Specifically, it includes
   conventions necessary to implement Elliptic Curve Diffie-Hellman
   (ECDH) with EnvelopedData and Elliptic Curve Digital Signature
   Algorithm (ECDSA) with SignedData.  This document extends RFC 6033.


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 June 22, 2010.

Copyright Notice

   Copyright (c) 2010 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



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   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.

.  Introduction

   This document describes the conventions for using Elliptic Curve
   cryptographic algorithms with the Cryptographic Message Syntax (CMS)
   encrypted key package content type [RFC6032].  Specifically, it
   includes conventions necessary to implement the following CMS content
   types: EnvelopedData [RFC5652] and SignedData [RFC5652].  This
   document amends [RFC6033].  Familiarity with [RFC6033] and [RFC5753]
   is assumed.

   This document does not define any new algorithms; instead, it refers
   to previously defined algorithms.

1.1  Terminology

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

.  EnvelopedData

   When key agreement is used, standard (as opposed to co-factor) ECDH
   [I-D.mcgrew-fundamental-ecc] MAY be supported.

.  SignedData

   If an implementation encapsulates an EncryptedKeyPacakge with a
   SignedData [RFC5652], then it MAY support the signature scheme ECDSA
   [I-D.mcgrew-fundamental-ecc].

.  Public Key Sizes

   The easiest way to implement the SignedData and EnvelopedData is with
   public key certificates [RFC5280][RFC5480]. If an implementation
   supports ECDSA or ECDH, then it MUST support keys on the P-256 curve.

.  Security Considerations

   The security considerations from [RFC5280], [RFC5480], [RFC5652],
   [RFC5753], [RFC6033], and [I D.mcgrew-fundamental-ecc] apply.




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.  IANA Considerations

   None.   Please remove this section prior to publication as an RFC.

.  References

7.1.  Normative References


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

   [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.

   [RFC5652] Housley, R., "Cryptographic Message Syntax (CMS)", RFC
             5652, September 2009.

   [RFC5753] Turner, S., and D. Brown, "Use of Elliptic Curve
             Cryptography (ECC) Algorithms in Cryptographic Message
             Syntax (CMS)", RFC 5753, January 2010.

   [RFC6032] Turner, S., and R. Housley, "Cryptographic Message Syntax
             (CMS) Encrypted Key Package Content Type", RFC 6032,
             December 2010.

   [RFC6033] Turner, S., "Algorithms for Cryptographic Message Syntax
             (CMS) Encrypted Key Package Content Type", RFC 6033,
             December 2010.

   [I-D.mcgrew-fundamental-ecc] McGrew, D., Igoe, E., and M. Salter,
             "Fundamental Elliptic Curve Cryptography Algorithms",
             draft-mcgrew-fundamental-ecc-04.txt, work-in-progress.

7.2.  Informative References

   None.








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Authors' Addresses

   Sean Turner
   IECA, Inc.
   3057 Nutley Street, Suite 106
   Fairfax, VA 22031
   USA

   EMail: turners@ieca.com










































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