Asymmetric Key Packages
RFC 5958

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Internet Engineering Task Force (IETF)                         S. Turner
Request for Comments: 5958                                          IECA
Obsoletes: 5208                                              August 2010
Category: Standards Track
ISSN: 2070-1721

                        Asymmetric Key Packages

Abstract

   This document defines the syntax for private-key information and a
   content type for it.  Private-key information includes a private key
   for a specified public-key algorithm and a set of attributes.  The
   Cryptographic Message Syntax (CMS), as defined in RFC 5652, can be
   used to digitally sign, digest, authenticate, or encrypt the
   asymmetric key format content type.  This document obsoletes RFC
   5208.

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/rfc5958.

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
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   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 5958                 Asymmetric Key Packages             August 2010

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

1.  Introduction

   This document defines the syntax for private-key information and a
   Cryptographic Message Syntax (CMS) [RFC5652] content type for it.
   Private-key information includes a private key for a specified
   public-key algorithm and a set of attributes.  The CMS can be used to
   digitally sign, digest, authenticate, or encrypt the asymmetric key
   format content type.  This document obsoletes PKCS #8 v1.2 [RFC5208].

1.1.  Requirements 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].

1.2.  ASN.1 Syntax Notation

   The key package is defined using ASN.1 [X.680], [X.681], [X.682], and
   [X.683].

1.3.  Summary of Updates to RFC 5208

   The following summarizes the updates to [RFC5208]:

   - Changed the name "PrivateKeyInfo" to "OneAsymmetricKey".  This
     reflects the addition of the publicKey field to allow both parts of
     the asymmetric key to be conveyed separately.  Not all algorithms
     will use both fields; however, the publicKey field was added for
     completeness.

   - Defined Asymmetric Key Package CMS content type.

   - Removed redundant IMPLICIT from attributes.

   - Added publicKey to OneAsymmetricKey and updated the version number.

Turner                       Standards Track                    [Page 2]
RFC 5958                 Asymmetric Key Packages             August 2010

   - Added that PKCS #9 attributes may be supported.

   - Added discussion of compatibility with other private-key formats.

   - Added requirements for encoding rule set.

   - Changed imports from PKCS #5 to [RFC5912] and [RFC5911].

   - Replaced ALGORITHM-IDENTIFIER with ALGORITHM from [RFC5912].

   - Registers application/pkcs8 media type and .p8 file extension.

2.  Asymmetric Key Package CMS Content Type

   The asymmetric key package CMS content type is used to transfer one
   or more plaintext asymmetric keys from one party to another.  An
   asymmetric key package MAY be encapsulated in one or more CMS