Network Working Group Sean Turner, IECA Internet Draft August 11, 2010 Updates: I-D.turner-encryptedkeypackagecontenttype-algs (once approved) Intended Status: Standard Track Expires: February 11, 2010 Elliptic Curve Algorithms for Cryptographic Message Syntax (CMS) Encrypted Key Package Content Type draft-turner-ekpct-algs-update-00.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 ECDH with EnvelopedData and ECDSA with SignedData. Status of this Memo This Internet-Draft is submitted to IETF in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet- Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html This Internet-Draft will expire on February 11, 2010. Copyright Notice Copyright (c) 2010 IETF Trust and the persons identified as the document authors. All rights reserved. Turner Expires February 11, 2011 [Page 1] Internet-Draft EC Algorithms for CMS Encrypted Key Packages August 2009 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. 1. Introduction This document describes the conventions for using Elliptic Curve cryptographic algorithms with the Cryptographic Message Syntax (CMS) encrypted key package content type [I-D.turner-encryptedkeypackagecontenttype]. Specifically, it includes conventions necessary to implement the following CMS content types: EnvelopedData [RFC5652] and SignedData [RFC5652]. This document updates [I-D.turner-encryptedkeypackagecontenttype-algs]. Familiarity with [I-D.turner-encryptedkeypackagecontenttype-algs] 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, ECDH [I-D.mcgrew-fundamental-ecc] MAY be supported. 3. SignedData If an implementation encapsulates an EncryptedKeyPacakge with a SignedData [RFC5652], then it MAY support the signature scheme ECDSA [I-D.mcgrew-fundamental-ecc]. Turner Expires February 11, 2011 [Page 2] Internet-Draft EC Algorithms for CMS Encrypted Key Packages August 2009 4. 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 P-256. 5. Security Considerations The security considerations from [RFC5280], [RFC5480], [RFC5652], [RFC5753], [I-D.turner-encryptedkeypackagecontenttype-algs], and [I-D.mcgrew-fundamental-ecc] apply. 6. IANA Considerations None. Please remove this section prior to publication as an RFC. 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. [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. [I-D.mcgrew-fundamental-ecc] McGrew, D., Igoe, E., and M. Salter, "Fundamental Elliptic Curve Cryptography Algorithms", draft-mcgrew-fundamental-ecc-03.txt, work-in-progress. [I-D.turner-encryptedkeypackagecontenttype] Turner, S., and R. Housley, "Cryptographic Message Syntax (CMS) Encrypted Key Package Content Type", draft-turner- encryptedkeypackagecontenttype-02.txt, work-in-progress. Turner Expires February 11, 2011 [Page 3] Internet-Draft EC Algorithms for CMS Encrypted Key Packages August 2009 [I-D.turner-encryptedkeypackagecontenttype-algs] Turner, S., "Algorithms for Cryptographic Message Syntax (CMS) Encrypted Key Package Content Type", draft-turner- encryptedkeypackagecontenttype-algs-02.txt, work-in- progress. 7.2. Informative References None. Authors' Addresses Sean Turner IECA, Inc. 3057 Nutley Street, Suite 106 Fairfax, VA 22031 USA EMail: turners@ieca.com Turner Expires February 11, 2011 [Page 4]