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Algorithms for Cryptographic Message Syntax (CMS) Encrypted Key Package Content Type
RFC 6033

Document type: RFC - Proposed Standard (December 2010)
Updated by RFC 6161
Document stream: IETF
Last updated: 2013-03-02
Other versions: plain text, pdf, html

IETF State: (None)
Consensus: Unknown
Document shepherd: No shepherd assigned

IESG State: RFC 6033 (Proposed Standard)
Responsible AD: Tim Polk
Send notices to: turners@ieca.com, draft-turner-encryptedkeypackagecontenttype-algs@tools.ietf.org, cwallace@cygnacom.com

Internet Engineering Task Force (IETF)                         S. Turner
Request for Comments: 6033                                          IECA
Category: Standards Track                                  December 2010
ISSN: 2070-1721

           Algorithms for Cryptographic Message Syntax (CMS)
                   Encrypted Key Package Content Type

Abstract

   This document describes the conventions for using several
   cryptographic algorithms with the Cryptographic Message Syntax (CMS)
   encrypted key package content type.  Specifically, it includes
   conventions necessary to implement EnvelopedData, EncryptedData, and
   AuthEnvelopedData.

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/rfc6033.

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
   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 6033        Algorithms for CMS Encrypted Key Packages  December 2010

1.  Introduction

   This document describes the conventions for using several
   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], EncryptedData [RFC5652], and
   AuthEnvelopedData [RFC5083].

   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", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

2.  EnvelopedData

   EnvelopedData [RFC5652] supports a number of key management
   techniques.  Implementations that claim conformance to this document
   MUST support the key transport mechanisms and SHOULD support the key
   agreement mechanisms as defined below.  Other techniques MAY be
   supported.

   When key transport is used, RSA encryption [RFC3370] MUST be
   supported and RSA Encryption Scheme - Optimal Asymmetric Encryption
   Padding (RSAES-OAEP) [RFC3560] SHOULD be supported.

   When key agreement is used, Ephemeral-Static Diffie-Hellman (DH)
   [RFC3370] MUST be supported.

   Since the content type is used to carry a cryptographic key and its
   attributes, an algorithm that is traditionally used to encrypt one
   key with another is employed.  Regardless of the key management
   technique choice, implementations MUST support AES-128 Key Wrap with
   Padding [RFC5649] as the content-encryption algorithm.
   Implementations SHOULD support AES-256 Key Wrap with Padding
   [RFC5649] as the content-encryption algorithm.

   When key agreement is used, a key wrap algorithm is also specified to
   wrap the content-encryption key.  If the content-encryption algorithm
   is AES-128 Key Wrap with Padding, then the key wrap algorithm MUST be
   AES-128 Key Wrap with Padding [RFC5649].  If the content-encryption
   algorithm is AES-256 Key Wrap with Padding, then the key wrap
   algorithm MUST be AES-256 Key Wrap with Padding [RFC5649].

Turner                       Standards Track                    [Page 2]
RFC 6033        Algorithms for CMS Encrypted Key Packages  December 2010

3.  EncryptedData

   EncryptedData [RFC5652] requires that keys be managed by other means;
   therefore, the only algorithm specified is the content-encryption
   algorithm.  Since the content type is used to carry a cryptographic

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