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+Internet Engineering Task Force (IETF)                         S. Turner
+Request for Comments: 6161                                          IECA
+Updates: 6033                                                 April 2011
+Category: Standards Track
+ISSN: 2070-1721
+
+
+    Elliptic Curve Algorithms for Cryptographic Message Syntax (CMS)
+                   Encrypted Key Package Content Type
+
+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 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/rfc6161.
+
+Copyright Notice
+
+   Copyright (c) 2011 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.
+
+
+
+
+Turner                       Standards Track                    [Page 1]
+
+RFC 6161      EC Algorithms for CMS Encrypted Key Packages    April 2011
+
+
+1.  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.com
+
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+Turner                       Standards Track                    [Page 3]
+