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Versions: 00 01 02 03 04 05 rfc5967                        Informational
Network Working Group                                         S. Turner
Internet Draft                                                     IECA
Intended Status: Informational                              May 6, 2010
Updates: 2986 (once approved)
Expires: November 6, 2010

                     The application/pkcs10 Media Type


   This document specifies a media type used to carry PKCS#10
   certification requests as defined in RFC 2986. It carries over the
   original specification from RFC 2311, which recently has been moved
   to Historic state, and properly links it to RFC 2986.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on November 6, 2010.

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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   described in the Simplified BSD License.

1. Introduction

   [RFC2311] first defined the application/pkcs10 media type.  When
   [RFC2633] was published, the application/pkcs10 section was dropped,
   but for some reason the text was not incorporated into the PKCS#10
   document [RFC2986].  [RFC2311] was moved to historic status by
   [RFC5751].  To ensure the IANA media type registration points to a
   non-historic document, this document updates [RFC2986] with the
   definition of the application/pkcs10 media type and an IANA
   registration based on [RFC4288].

   The text for Section 2 is adapted from Section 3.7 of [RFC2311].

1.1. Requirements Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   document are to be interpreted as described in [RFC2119].

2. Creating a Certification Request

   A typical application which allows a user to generate cryptographic
   information has to submit that information to a certification
   authority (CA), who transforms it into a certificate.  PKCS #10
   [RFC2986] describes a syntax for certification requests.  A PKCS #10
   certification request MUST use the application/pkcs10 media type.

   The details of certification requests and the process of obtaining a
   certificate are beyond the scope of this memo. Instead, only the
   format of data used in application/pkcs10 is defined.

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2.1. Format of the application/pkcs10 Body

   PKCS #10 defines the ASN.1 type CertificationRequest for use in
   submitting a certification request. For transfer to a CA, this
   abstract syntax needs to be encoded and identified in a unique
   manner.  When the media type application/pkcs10 is used, the body
   MUST be a CertificationRequest, encoded using the Basic Encoding
   Rules (BER) [X.690].

   Although BER is specified, instead of the more restrictive
   Distinguished Encoding Rules (DER) [X.690], a typical application
   will use DER since the CertificationRequest's
   CertificationRequestInfo has to be DER-encoded in order to be signed.

   A robust application SHOULD output DER, but allow BER or DER on

   Data produced by BER or DER is 8-bit, but some transports are limited
   to 7-bit data. In such cases, a suitable 7-bit transfer encoding MUST
   be applied; in MIME-compatible transports, the base64 encoding
   [RFC4648] SHOULD be used with application/pkcs10, although any 7-bit
   transfer encoding may work.

2.2. Sending and Receiving an application/pkcs10 Body Part

   For sending a certificate-signing request, the application/pkcs10
   message format MUST be used to convey a PKCS #10 certificate-signing
   request. Note that for sending certificates and CRLs without any
   signed content, the application/pkcs7-mime message format MUST be
   used to convey a degenerate PKCS #7 signedData "certs-only" message

   To send an application/pkcs10 body, the application generates the
   cryptographic information for the user. The details of the
   cryptographic information are beyond the scope of this memo.

   Step 1. The cryptographic information is placed within a PKCS #10

   Step 2. The CertificationRequest is encoded according to BER or DER
   (typically, DER).

   Step 3. As a typical step, the DER-encoded CertificationRequest is
   also base64 encoded so that it is 7-bit data suitable for transfer in
   ESMTP. This then becomes the body of an application/pkcs10 body part.

   The result might look like this:

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     Content-Type: application/pkcs10; name=smime.p10
     Content-Transfer-Encoding: base64
     Content-Disposition: attachment; filename=smime.p10


   A typical application only needs to send a certification request. It
   is a certification authority that has to receive and process the
   request. The steps for recovering the CertificationRequest from the
   message are straightforward but are not presented here. The
   procedures for processing the certification request are beyond the
   scope of this document.

3. IANA Considerations

   IANA is asked to update the registration for the application/pkcs10
   media subtype in the Application Media Types registry using the
   filled-in template from BCP 13 [RFC4288] given below.

3.1. Registration of media subtype application/pkcs10

   The media subtype for a PKCS#10 certification request is

     Type name: application

     Subtype name: pkcs10

     Required parameters: None

     Optional parameters: None

     Encoding considerations: binary; See Section 2.

     Security considerations:

      Clients use a certification request to request that a
      Certification Authority certify a public key.  The certification
      request is digitally signed.  Also see Section 6.

     Interoperability considerations: See Section 2.

     Published specification: This specification.

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     Applications which use this media type:

       Applications that support PKCS#10 certification requests

     Additional information:

       Magic number(s): None
       File extension(s): .p10
       Macintosh File Type Code(s):

     Person & email address to contact for further information:
       Sean Turner <turners@ieca.com>

     Restrictions on usage: none

     Author: Sean Turner <turners@ieca.com>

     Intended usage: COMMON

     Change controller: The IESG

4. Security Considerations

   The security considerations of [RFC2986] and [RFC5751] apply; no new
   security considerations are introduced by this document.

5. Acknowledgements

   I wish to thank the authors of RFC 2311, Steve Dusse, Paul Hoffman,
   Blake Ramsdell, Laurence Lundblade, and Lisa Repka.

   I would also like to thank Bjoern Hoehrmann for his review of the
   media subtype application.

6. References

6.1. Normative References

   [RFC2119]    Bradner, S., "Key words for use in RFCs to Indicate
                Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC2986]    Nystrom, M, and B. Kaliski, "PKCS #10: Certification
                Request Syntax Specification Version 1.7", RFC 2986,
                November 2000.

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   [RFC4288]    Freed, N., and J. Klensin, "Media Type Specifications
                and Registration Procedures, BCP 13, RFC 4288, December

   [RFC4648]    Josefsson, S., "The Base16, Base32, and Base64 Data
                Encodings", RFC 4648, October 2006.

   [RFC5751]    Turner, S. and B. Ramsdell, "Secure/Multipurpose
                Internet Mail Extensions (S/MIME) Version 3.2 Message
                Specification", RFC 5751, January 2010.

   [X.690]      ITU-T Recommendation X.690 (2002) | ISO/IEC 8825-
                1:2002.  Information Technology - ASN.1 encoding rules:
                Specification of Basic Encoding Rules (BER), Canonical
                Encoding Rules (CER) and Distinguished Encoding Rules

6.2. Informative References

   [RFC2311]    Dusse, S., Hoffman, P., Ramsdell, B., Lundblade, L.,
                and L. Repka, "S/MIME Version 2 Message Specification",
                RFC 2311, March 1998.

   [RFC2633]    Ramsdell, B., "S/MIME Version 3 Message Specification",
                RFC 2633, June 1999.

Authors' Addresses

   Sean Turner
   IECA, Inc.
   3057 Nutley Street, Suite 106
   Fairfax, VA 22031

   EMail: turners@ieca.com

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