JSON Web Key (JWK) Thumbprint
draft-ietf-jose-jwk-thumbprint-01

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JOSE Working Group                                              M. Jones
Internet-Draft                                                 Microsoft
Intended status: Standards Track                             N. Sakimura
Expires: July 26, 2015                                               NRI
                                                        January 22, 2015

                     JSON Web Key (JWK) Thumbprint
                   draft-ietf-jose-jwk-thumbprint-01

Abstract

   This specification defines a means of computing a thumbprint value
   (a.k.a. digest) of JSON Web Key (JWK) objects analogous to the "x5t"
   (X.509 Certificate SHA-1 Thumbprint) value defined for X.509
   certificate objects.  This specification also registers the new JSON
   Web Signature (JWS) and JSON Web Encryption (JWE) Header Parameters
   and the new JSON Web Key (JWK) member name "jkt" (JWK SHA-256
   Thumbprint) for holding these values.

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
   Task Force (IETF).  Note that other groups may also distribute
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   This Internet-Draft will expire on July 26, 2015.

Copyright Notice

   Copyright (c) 2015 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

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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.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1.  Notational Conventions . . . . . . . . . . . . . . . . . .  3
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  JSON Web Key (JWK) Thumbprint  . . . . . . . . . . . . . . . .  3
     3.1.  Example JWK Thumbprint Computation . . . . . . . . . . . .  4
     3.2.  JWK Members Used in the Thumbprint Computation . . . . . .  5
       3.2.1.  JWK Thumbprint of a Private Key  . . . . . . . . . . .  6
       3.2.2.  Why Not Include Optional Members?  . . . . . . . . . .  6
     3.3.  Order and Representation of Members in Hash Input  . . . .  7
     3.4.  JWK Thumbprints of Keys Not in JWK Format  . . . . . . . .  7
   4.  "jkt" Member Definitions . . . . . . . . . . . . . . . . . . .  8
     4.1.  "jkt" (JWK SHA-256 Thumbprint) JWS Header Parameter  . . .  8
     4.2.  "jkt" (JWK SHA-256 Thumbprint) JWE Header Parameter  . . .  8
     4.3.  "jkt" (JWK SHA-256 Thumbprint) JWK Parameter . . . . . . .  8
     4.4.  Possible Future Alternative Thumbprint Computations  . . .  8
   5.  Practical JSON and Unicode Considerations  . . . . . . . . . .  8
   6.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  9
     6.1.  JWS and JWE Header Parameter Registration  . . . . . . . .  9
       6.1.1.  Registry Contents  . . . . . . . . . . . . . . . . . . 10
     6.2.  JSON Web Key Parameters Registration . . . . . . . . . . . 10
       6.2.1.  Registry Contents  . . . . . . . . . . . . . . . . . . 10
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . . 10
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 11
     8.1.  Normative References . . . . . . . . . . . . . . . . . . . 11
     8.2.  Informative References . . . . . . . . . . . . . . . . . . 11
   Appendix A.  Acknowledgements  . . . . . . . . . . . . . . . . . . 11
   Appendix B.  Document History  . . . . . . . . . . . . . . . . . . 12
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 12

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1.  Introduction

   This specification defines a means of computing a thumbprint value
   (a.k.a. digest) of JSON Web Key (JWK) [JWK] objects analogous to the
   "x5t" (X.509 Certificate SHA-1 Thumbprint) value defined for X.509
   certificate objects.  This specification also registers the new JSON
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