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JOSE Working Group                                              M. Jones
Internet-Draft                                                 Microsoft
Intended status: Standards Track                              J. Bradley
Expires: May 10, 2013                                        independent
                                                             N. Sakimura
                                               Nomura Research Institute
                                                        November 6, 2012


             JSON Web Signature JSON Serialization (JWS-JS)
               draft-jones-jose-jws-json-serialization-03

Abstract

   The JSON Web Signature JSON Serialization (JWS-JS) is a means of
   representing content secured with digital signatures or Message
   Authentication Codes (MACs) using JavaScript Object Notation (JSON)
   data structures.  This specification describes a means of
   representing secured content as a JSON data object (as opposed to the
   JWS specification, which uses a compact serialization with a URL-safe
   representation).  It enables multiple digital signatures and/or MACs
   to be applied to the same content (unlike JWS).  Cryptographic
   algorithms and identifiers used with this specification are described
   in the separate JSON Web Algorithms (JWA) specification.  The JSON
   Serialization for related encryption functionality is described in
   the separate JSON Web Encryption JSON Serialization (JWE-JS)
   specification.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   Internet-Drafts are draft documents valid for a maximum of six months
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   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on May 10, 2013.

Copyright Notice

   Copyright (c) 2012 IETF Trust and the persons identified as the



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   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.


Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
     1.1.  Notational Conventions  . . . . . . . . . . . . . . . . . . 3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . 3
   3.  JSON Serialization  . . . . . . . . . . . . . . . . . . . . . . 3
   4.  Example JWS-JS  . . . . . . . . . . . . . . . . . . . . . . . . 4
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5
   6.  Security Considerations . . . . . . . . . . . . . . . . . . . . 5
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 5
     7.1.  Normative References  . . . . . . . . . . . . . . . . . . . 5
     7.2.  Informative References  . . . . . . . . . . . . . . . . . . 6
   Appendix A.  Acknowledgements . . . . . . . . . . . . . . . . . . . 6
   Appendix B.  Open Issues  . . . . . . . . . . . . . . . . . . . . . 6
   Appendix C.  Document History . . . . . . . . . . . . . . . . . . . 6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . . . 7






















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1.  Introduction

   The JSON Web Signature JSON Serialization (JWS-JS) is a format for
   representing content secured with digital signatures or Message
   Authentication Codes (MACs) as a JavaScript Object Notation (JSON)
   [RFC4627] object.  It enables multiple digital signatures and/or MACs
   to be applied to the same content (unlike JWS [JWS]).  The digital
   signature and MAC mechanisms used are independent of the type of
   content being secured, allowing arbitrary content to be secured.
   Cryptographic algorithms and identifiers used with this specification
   are described in the separate JSON Web Algorithms (JWA) [JWA]
   specification.  The JSON Serialization for related encryption
   functionality is described in the separate JSON Web Encryption JSON
   Serialization (JWE-JS) [JWE-JS] specification.

1.1.  Notational Conventions

   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 Key words for use in
   RFCs to Indicate Requirement Levels [RFC2119].


2.  Terminology

   This specification uses the same terminology as the JSON Web
   Signature (JWS) [JWS] specification.


3.  JSON Serialization

   The JSON Serialization represents secured content as a JSON object
   with a "recipients" member containing an array of per-recipient
   information and a "payload" member containing a shared Encoded JWS
   Payload value.  Each member of the "recipients" array is a JSON
   object with a "header" member containing an Encoded JWS Header value
   and a "signature" member containing an Encoded JWS Signature value.

   Unlike the compact serialization used by JWSs, content using the JSON
   Serialization MAY be secured with more than one digital signature
   and/or MAC value.  Each is represented as an Encoded JWS Signature
   value in the "signature" member of an object in the "recipients"
   array.  For each, there is an Encoded JWS Encoded Header value in the
   "header" member of the same object in the "recipients" array.  This
   specifies the digital signature or MAC applied to the Encoded JWS
   Header value and the shared Encoded JWS Payload value to create the
   JWS Signature value.  Therefore, the syntax is:




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     {"recipients":[
       {"header":"<header 1 contents>",
        "signature":"<signature 1 contents>"},
       ...
       {"header":"<header N contents>",
        "signature":"<signature N contents>"}],
      "payload":"<payload contents>"
     }

   The contents of the Encoded JWS Header, Encoded JWS Payload, and
   Encoded JWS Signature values are exactly as specified in JSON Web
   Signature (JWS) [JWS].  They are interpreted and validated in the
   same manner, with each corresponding "header" and "signature" value
   being created and validated together.

   Each JWS Signature value is computed on the JWS Secured Input
   corresponding to the concatenation of the Encoded JWS Header, a
   period ('.') character, and the Encoded JWS Payload in the same
   manner described in the JWS specification.  This has the desirable
   result that each Encoded JWS signature value in the "recipients"
   array is identical to the value that would be used for the same
   parameters in a JWS.


4.  Example JWS-JS

   This section contains an example using the JWS JSON Serialization.
   This example demonstrates the capability for conveying multiple
   digital signatures and/or MACs for the same payload.

   The Encoded JWS Payload used in this example is the same as used in
   the examples in Appendix A of JWS (with line breaks for display
   purposes only):

     eyJpc3MiOiJqb2UiLA0KICJleHAiOjEzMDA4MTkzODAsDQogImh0dHA6Ly9leGFt
     cGxlLmNvbS9pc19yb290Ijp0cnVlfQ

   Two digital signatures are used in this example: an RSA SHA-256
   signature, for which the header and signature values are the same as
   in Appendix A.2 of JWS, and an ECDSA P-256 SHA-256 signature, for
   which the header and signature values are the same as in Appendix A.3
   of JWS.  The two Decoded JWS Header Segments used are:

     {"alg":"RS256"}

   and:

     {"alg":"ES256"}



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   Since the computations of the JWS Header and JWS Signature values are
   the same as in Appendix A.2 and Appendix A.3 of JWS, they are not
   repeated here.

   The complete JSON Web Signature JSON Serialization (JWS-JS) for these
   values is as follows (with line breaks for display purposes only):

     {"recipients":[
       {"header":"eyJhbGciOiJSUzI1NiJ9",
        "signature":
         "cC4hiUPoj9Eetdgtv3hF80EGrhuB__dzERat0XF9g2VtQgr9PJbu3XOiZj5RZ
          mh7AAuHIm4Bh-0Qc_lF5YKt_O8W2Fp5jujGbds9uJdbF9CUAr7t1dnZcAcQjb
          KBYNX4BAynRFdiuB--f_nZLgrnbyTyWzO75vRK5h6xBArLIARNPvkSjtQBMHl
          b1L07Qe7K0GarZRmB_eSN9383LcOLn6_dO--xi12jzDwusC-eOkHWEsqtFZES
          c6BfI7noOPqvhJ1phCnvWh6IeYI2w9QOYEUipUTI8np6LbgGY9Fs98rqVt5AX
          LIhWkWywlVmtVrBp0igcN_IoypGlUPQGe77Rw"},
       {"header":"eyJhbGciOiJFUzI1NiJ9",
        "signature":
         "DtEhU3ljbEg8L38VWAfUAqOyKAM6-Xx-F4GawxaepmXFCgfTjDxw5djxLa8IS
          lSApmWQxfKTUJqPP3-Kg6NU1Q"}],
      "payload":
       "eyJpc3MiOiJqb2UiLA0KICJleHAiOjEzMDA4MTkzODAsDQogImh0dHA6Ly9leGF
        tcGxlLmNvbS9pc19yb290Ijp0cnVlfQ"
     }


5.  IANA Considerations

   This specification makes no requests of IANA.


6.  Security Considerations

   The security considerations for this specification are the same as
   those for the JSON Web Signature (JWS) [JWS] specification.


7.  References

7.1.  Normative References

   [JWA]      Jones, M., "JSON Web Algorithms (JWA)", November 2012.

   [JWS]      Jones, M., Bradley, J., and N. Sakimura, "JSON Web
              Signature (JWS)", November 2012.

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



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   [RFC4627]  Crockford, D., "The application/json Media Type for
              JavaScript Object Notation (JSON)", RFC 4627, July 2006.

7.2.  Informative References

   [JSS]      Bradley, J. and N. Sakimura (editor), "JSON Simple Sign",
              September 2010.

   [JWE-JS]   Jones, M., "JSON Web Encryption JSON Serialization
              (JWE-JS)", November 2012.

   [MagicSignatures]
              Panzer (editor), J., Laurie, B., and D. Balfanz, "Magic
              Signatures", January 2011.


Appendix A.  Acknowledgements

   JSON serializations for secured content were previously explored by
   Magic Signatures [MagicSignatures] and JSON Simple Sign [JSS].


Appendix B.  Open Issues

   [[ to be removed by the RFC editor before publication as an RFC ]]

   The following items remain to be considered or done in this draft:

   o  Track changes that occur in the JWS spec.


Appendix C.  Document History

   [[ to be removed by the RFC editor before publication as an RFC ]]

   -03

   o  Updated references.

   -02

   o  Changed to use an array of structures for per-recipient values,
      rather than a set of parallel arrays.

   -01

   o  Generalized language to refer to Message Authentication Codes
      (MACs) rather than Hash-based Message Authentication Codes



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      (HMACs).

   -00

   o  Renamed draft-jones-json-web-signature-json-serialization to
      draft-jones-jose-jws-json-serialization to have "jose" be in the
      document name so it can be included in the Related Documents list
      at http://datatracker.ietf.org/wg/jose/.  No normative changes.

   draft-jones-json-web-signature-json-serialization-02

   o  Tracked editorial changes made to the JWS spec.

   draft-jones-json-web-signature-json-serialization-01

   o  Corrected the Magic Signatures reference.

   draft-jones-json-web-signature-json-serialization-00

   o  Created the initial version incorporating JOSE working group input
      and drawing from the JSON Serialization previously proposed in
      draft-jones-json-web-token-01.


Authors' Addresses

   Michael B. Jones
   Microsoft

   Email: mbj@microsoft.com
   URI:   http://self-issued.info/


   John Bradley
   independent

   Email: ve7jtb@ve7jtb.com


   Nat Sakimura
   Nomura Research Institute

   Email: n-sakimura@nri.co.jp








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