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This is a modified version of the Internet RFC suitable for machine-translating. Original version is available here: RFC6161

PROPOSED STANDARD
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















Turner Standards Track [Page 3]

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