<div dir="ltr"><div dir="ltr">I think the text in 12.1 is just unclear, I believe it is referring to the values of the metadata parameter `<span style="background-color:rgb(249,249,249);font-family:"Roboto Mono",monospace;font-size:13.3px">subject_syntax_types_supported`</span>. When the subject syntax type is <span style="background-color:rgb(249,249,249);font-family:"Roboto Mono",monospace;font-size:13.3px">"urn:ietf:params:oauth:jwk-thumbprint"</span> then <span style="background-color:rgb(249,249,249);font-family:"Roboto Mono",monospace;font-size:13.3px">"sub": "NzbLsXh8uDCcd-6MNwXF4W_7noWXFZAfHkxZsRGC9Xs" </span>is allowed, at least in the current implementers draft.</div><div dir="ltr"><br></div><div dir="ltr">That said, I'm wondering if there's some updates likely to happen that will change this and make all the references to and examples of thumbprints use the more formal jwk-thumbprint urn prefix for the sub value so that it is always required to be a URI. (cc <a class="gmail_plusreply" id="plusReplyChip-0">@kristina)</a></div><div dir="ltr"><br></div><div dir="ltr">Jer<br><div><br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Dec 8, 2022 at 1:43 AM Nikos Fotiou via Openid-specs-ab <<a href="mailto:openid-specs-ab@lists.openid.net">openid-specs-ab@lists.openid.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg-4191692121820710165"><div lang="EL" style="overflow-wrap: break-word;"><div class="m_-4191692121820710165WordSection1"><p class="MsoNormal"><span lang="EN-US">Hi,<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-US">In siop v2 (<a href="https://openid.net/specs/openid-connect-self-issued-v2-1_0.html#name-self-issued-id-token" target="_blank">https://openid.net/specs/openid-connect-self-issued-v2-1_0.html#name-self-issued-id-token</a>) when it comes to the “self-issued ID Token” section 12 says:<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-US">“sub[…]When Subject Syntax Type is JWK Thumbprint, the value is the base64url encoded representation of the thumbprint of the key in the sub_jwk Claim”<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-US">Then, a example follows where the “sub” claim is indeed a base64url encoded representation of key thumbprint. However, in section 12.1 the text says:<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-US">“The RP MUST identify which Subject Syntax Type is used based on the URI of the sub Claim. Valid values defined in this specification are urn:ietf:params:oauth:jwk-thumbprint for JWK Thumbprint Subject Syntax Type and did: for Decentralized Identifier Subject Syntax Type”<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-US">This confuses me. Which of the following is the correct syntax for the sub claim when Subject Syntax Type is JWK Thumbprint: <u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-US">"sub": "NzbLsXh8uDCcd-6MNwXF4W_7noWXFZAfHkxZsRGC9Xs",<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-US">Or<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-US">"sub": "urn:ietf:params:oauth:jwk-thumbprint:NzbLsXh8uDCcd-6MNwXF4W_7noWXFZAfHkxZsRGC9Xs",<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-US">Best,<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US">Nikos<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-US">--------<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US">Nikos Fotiou - </span><a href="https://www.fotiou.gr" target="_blank"><span lang="EN-US" style="color:rgb(5,99,193)">https://www.fotiou.gr</span></a><span lang="EN-US"><u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US">Researcher - Mobile Multimedia Laboratory<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US">Athens University of Economics and Business<u></u><u></u></span></p><p class="MsoNormal"><a href="https://mm.aueb.gr/" target="_blank"><span style="color:rgb(5,99,193)">https://mm.aueb.gr</span></a><u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p></div></div>_______________________________________________<br>
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