JWK Thumbprint URI

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Table of Contents

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:¶

• urn:ietf:params:oauth:jwk-thumbprint¶

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

  NzbLsXh8uDCcd-6MNwXF4W_7noWXFZAfHkxZsRGC9Xs

  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

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¶

• More fully described the motivations for JWK Thumbprint URIs.¶

-00¶

• Created initial draft.¶

Authors' Addresses