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Internet Engineering Task Force (IETF)                         S. TurnerRequest for Comments: 6161                                          IECAUpdates:6033                                                 April 2011Category: Standards TrackISSN: 2070-1721Elliptic Curve Algorithms for Cryptographic Message Syntax (CMS)Encrypted Key Package Content TypeAbstract   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 extendsRFC 6033.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 inSection 2 of RFC 5741.   Information about the current status of this document, any errata,   and how to provide feedback on it may be obtained athttp://www.rfc-editor.org/info/rfc6161.Copyright Notice   Copyright (c) 2011 IETF Trust and the persons identified as the   document authors.  All rights reserved.   This document is subject toBCP 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.Turner                       Standards Track                    [Page 1]

RFC 6161      EC Algorithms for CMS Encrypted Key Packages    April 20111.  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].2.  EnvelopedData   When key agreement is used, standard (as opposed to cofactor) ECDH   [RFC6090][RFC5753] MAY be supported.3.  SignedData   If an implementation encapsulates EncryptedKeyPackage with SignedData   [RFC5652], then it MAY support the signature scheme ECDSA   [RFC6090][RFC5753].4.  Public Key Sizes   The easiest way to implement 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.5.  Security Considerations   The security considerations from [RFC5280], [RFC5480], [RFC5652],   [RFC5753], [RFC6033], and [RFC6090] apply.6.  Normative References   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate              Requirement Levels",BCP 14,RFC 2119, March 1997.Turner                       Standards Track                    [Page 2]

RFC 6161      EC Algorithms for CMS Encrypted Key Packages    April 2011   [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)", STD 70,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.   [RFC6090]  McGrew, D., Igoe, K., and M. Salter, "Fundamental Elliptic              Curve Cryptography Algorithms",RFC 6090, February 2011.Author's Address   Sean Turner   IECA, Inc.   3057 Nutley Street, Suite 106   Fairfax, VA 22031   USA   EMail: turners@ieca.comTurner                       Standards Track                    [Page 3]