OAuth Working Group                                             M. Jones
Internet-Draft                                                 K. Yasuda
Intended status: Standards Track                               Microsoft
Expires: July 16, 2022                                  January 12, 2022


                           JWK Thumbprint URI
                draft-jones-oauth-jwk-thumbprint-uri-01

Abstract

   This specification registers a kind of URI that represents a JSON Web
   Key (JWK) Thumbprint value.  JWK Thumbprints are defined in RFC 7638.
   This enables JWK Thumbprints to be used, for instance, as key
   identifiers in contexts requiring URIs.

Status of This Memo

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Notation and Conventions . . . . . . . . . . . .   2
   3.  JWK Thumbprint URI  . . . . . . . . . . . . . . . . . . . . .   2
     3.1.  Example JWK Thumbprint URI  . . . . . . . . . . . . . . .   3
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
     5.1.  OAuth URI Registration  . . . . . . . . . . . . . . . . .   3
       5.1.1.  Registry Contents . . . . . . . . . . . . . . . . . .   3
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   3
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   3
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   4
   Appendix A.  Acknowledgements . . . . . . . . . . . . . . . . . .   4
   Appendix B.  Document History . . . . . . . . . . . . . . . . . .   4
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   A JSON Web Key (JWK) Thumbprint [RFC7638] is a URL-safe
   representation of a hash value over a JSON Web Key (JWK) [RFC7517].
   This specification defines a URI prefix indicating that the portion
   of the URI following the prefix is a JWK Thumbprint.  This enables
   JWK Thumbprints to be communicated in contexts requiring URIs,
   including in specific JSON Web Token (JWT) [RFC7519] claims.

   JWK Thumbprints URIs are being used in the [SIOPv2] specification as
   one kind of subject identifier in a context requiring that the
   identifier be a URI.  In this case, the subject identifier is derived
   from a public key represented as a JWK.  Expressing the identifier as
   JWK Thumbprint URI enables this kind of identifier to be
   differentiated from other kinds of identifiers that are also URIs,
   such as Decentralized Identifiers (DIDs) [DID-Core].

2.  Requirements Notation and Conventions

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in BCP
   14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

3.  JWK Thumbprint URI

   The following URI prefix is defined to indicate that the portion of
   the URI following the prefix is a JWK Thumbprint:

   o  "urn:ietf:params:oauth:jwk-thumbprint"



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   The prefix is followed by a colon and a JWK Thumbprint value to form
   a URI representing a JWK Thumbprint.

3.1.  Example JWK Thumbprint URI

   Section 3.1 of [RFC7638] contains the following example JWK
   Thumbprint value:

     NzbLsXh8uDCcd-6MNwXF4W_7noWXFZAfHkxZsRGC9Xs

   A complete JWK Thumbprint URI using the above JWK Thumbprint is:

  urn:ietf:params:oauth:jwk-thumbprint:NzbLsXh8uDCcd-6MNwXF4W_7noWXFZAfHkxZsRGC9Xs

4.  Security Considerations

   The security considerations of [RFC7638] also apply when using this
   specification.

5.  IANA Considerations

5.1.  OAuth URI Registration

   This specification registers the following value in the IANA "OAuth
   URI" registry [IANA.OAuth.Parameters] established by [RFC6755].

5.1.1.  Registry Contents

   o  URN: urn:ietf:params:oauth:jwk-thumbprint
   o  Common Name: JWK Thumbprint URI
   o  Change controller: IESG
   o  Specification Document: [[ this specification ]]

6.  References

6.1.  Normative References

   [IANA.OAuth.Parameters]
              IANA, "OAuth Parameters",
              <http://www.iana.org/assignments/oauth-parameters>.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.






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   [RFC7638]  Jones, M. and N. Sakimura, "JSON Web Key (JWK)
              Thumbprint", RFC 7638, DOI 10.17487/RFC7638, September
              2015, <https://www.rfc-editor.org/info/rfc7638>.

   [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
              2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
              May 2017, <https://www.rfc-editor.org/info/rfc8174>.

6.2.  Informative References

   [DID-Core]
              Sporny, M., Guy, A., Sabadello, M., and D. Reed,
              "Decentralized Identifiers (DIDs) v1.0", Aug 2021,
              <https://www.w3.org/TR/2021/PR-did-core-20210803/>.

   [RFC6755]  Campbell, B. and H. Tschofenig, "An IETF URN Sub-Namespace
              for OAuth", RFC 6755, DOI 10.17487/RFC6755, October 2012,
              <https://www.rfc-editor.org/info/rfc6755>.

   [RFC7517]  Jones, M., "JSON Web Key (JWK)", RFC 7517,
              DOI 10.17487/RFC7517, May 2015,
              <https://www.rfc-editor.org/info/rfc7517>.

   [RFC7519]  Jones, M., Bradley, J., and N. Sakimura, "JSON Web Token
              (JWT)", RFC 7519, DOI 10.17487/RFC7519, May 2015,
              <https://www.rfc-editor.org/info/rfc7519>.

   [SIOPv2]   Yasuda, K. and M. B. Jones, "Self-Issued OpenID Provider
              v2", December 2021, <https://openid.net/specs/openid-
              connect-self-issued-v2-1_0.html>.

Appendix A.  Acknowledgements

   Use cases for this specification were developed in the OpenID Connect
   Working Group of the OpenID Foundation.  Specifically, it is being
   used a key identifier in the [SIOPv2] specification.

   The following individuals also contributed to this specification:
   John Bradley and Adam Lemmon.

Appendix B.  Document History

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

   -01

   o  More fully described the motivations for JWK Thumbprint URIs.




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   -00

   o  Created initial draft.

Authors' Addresses

   Michael B. Jones
   Microsoft

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


   Kristina Yasuda
   Microsoft

   Email: kryasuda@microsoft.com
   URI:   https://twitter.com/kristinayasuda

































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