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<div>I get that from a JWK point of view, but what is suppose to live at the end of the jwk_url <span style="font-style: italic; "> and jwk_</span>encryption_url parameters of an idP or a client as far as section 4.2 in the Messages spec goes? It doesn't make
a distinction as to if it expects those urls to point to keys or key sets. At the end of section 4.2 is states that if keys are supplied in both X509 and JWK format then the keys must be identical. They can't be identical if one is a set and the other is
an X509 cert with just one key in it so it seems to implicitly state that the jwk_url and jwk_encruyption_url params point to single JWK's and not a Ket Set. </div>
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<div>Rob</div>
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<span style="font-weight:bold">From: </span>Mike Jones <<a href="mailto:Michael.Jones@microsoft.com">Michael.Jones@microsoft.com</a>><br>
<span style="font-weight:bold">Date: </span>Wednesday, June 27, 2012 1:56 PM<br>
<span style="font-weight:bold">To: </span>Rob Dingwell <<a href="mailto:bobd@mitre.org">bobd@mitre.org</a>>, "<a href="mailto:openid-specs-ab@lists.openid.net">openid-specs-ab@lists.openid.net</a>" <<a href="mailto:openid-specs-ab@lists.openid.net">openid-specs-ab@lists.openid.net</a>><br>
<span style="font-weight:bold">Subject: </span>RE: JWK clarification<br>
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<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; ">The top-level format continues to be an array of keys. Individual keys can also be used where appropriate. In the following example, an array of
keys is specified:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; "><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:#CCCCCC"><span lang="EN" style="color: black; font-family: 'Courier New'; ">{"keys":<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#CCCCCC"><span lang="EN" style="color: black; font-family: 'Courier New'; "> [<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#CCCCCC"><span lang="EN" style="color: black; font-family: 'Courier New'; "> {"alg":"EC",<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#CCCCCC"><span lang="EN" style="color: black; font-family: 'Courier New'; "> "crv":"P-256",<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#CCCCCC"><span lang="EN" style="color: black; font-family: 'Courier New'; "> "x":"MKBCTNIcKUSDii11ySs3526iDZ8AiTo7Tu6KPAqv7D4",<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#CCCCCC"><span lang="EN" style="color: black; font-family: 'Courier New'; "> "y":"4Etl6SRW2YiLUrN5vfvVHuhp7x8PxltmWWlbbM4IFyM",<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#CCCCCC"><span lang="EN" style="color: black; font-family: 'Courier New'; "> "use":"enc",<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#CCCCCC"><span lang="EN" style="color: black; font-family: 'Courier New'; "> "kid":"1"},<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#CCCCCC"><span lang="EN" style="color: black; font-family: 'Courier New'; "><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:#CCCCCC"><span lang="EN" style="color: black; font-family: 'Courier New'; "> {"alg":"RSA",<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#CCCCCC"><span lang="EN" style="color: black; font-family: 'Courier New'; "> "mod": "0vx7agoebGcQSuuPiLJXZptN9nndrQmbXEps2aiAFbWhM78LhWx<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#CCCCCC"><span lang="EN" style="color: black; font-family: 'Courier New'; ">4cbbfAAtVT86zwu1RK7aPFFxuhDR1L6tSoc_BJECPebWKRXjBZCiFV4n3oknjhMs<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#CCCCCC"><span lang="EN" style="color: black; font-family: 'Courier New'; ">tn64tZ_2W-5JsGY4Hc5n9yBXArwl93lqt7_RN5w6Cf0h4QyQ5v-65YGjQR0_FDW2<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#CCCCCC"><span lang="EN" style="color: black; font-family: 'Courier New'; ">QvzqY368QQMicAtaSqzs8KJZgnYb9c7d0zgdAZHzu6qMQvRL5hajrn1n91CbOpbI<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#CCCCCC"><span lang="EN" style="color: black; font-family: 'Courier New'; ">SD08qNLyrdkt-bFTWhAI4vMQFh6WeZu0fM4lFd2NcRwr3XPksINHaQ-G_xBniIqb<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#CCCCCC"><span lang="EN" style="color: black; font-family: 'Courier New'; ">w0Ls1jF44-csFCur-kEgU8awapJzKnqDKgw",<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#CCCCCC"><span lang="EN" style="color: black; font-family: 'Courier New'; "> "exp":"AQAB",<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#CCCCCC"><span lang="EN" style="color: black; font-family: 'Courier New'; "> "kid":"2011-04-29"}<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#CCCCCC"><span lang="EN" style="color: black; font-family: 'Courier New'; "> ]<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#CCCCCC"><span lang="EN" style="color: black; font-family: 'Courier New'; ">}<o:p></o:p></span></p>
<p class="MsoNormal"><a name="anchor3"></a><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; "><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; ">In this example, a single key is specified:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; "><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:#CCCCCC"><span lang="EN" style="color: black; font-family: 'Courier New'; "> {"alg":"EC",<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#CCCCCC"><span lang="EN" style="color: black; font-family: 'Courier New'; "> "crv":"P-256",<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#CCCCCC"><span lang="EN" style="color: black; font-family: 'Courier New'; "> "x":"MKBCTNIcKUSDii11ySs3526iDZ8AiTo7Tu6KPAqv7D4",<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#CCCCCC"><span lang="EN" style="color: black; font-family: 'Courier New'; "> "y":"4Etl6SRW2YiLUrN5vfvVHuhp7x8PxltmWWlbbM4IFyM",<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#CCCCCC"><span lang="EN" style="color: black; font-family: 'Courier New'; "> "use":"enc",<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#CCCCCC"><span lang="EN" style="color: black; font-family: 'Courier New'; "> "kid":"1"}<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; "><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; ">The array format is used in contexts such as the key values retrieved for the JWS and JWE “jku” parameter where multiple keys may be specified.
The single key format is used in contexts such as the JWE “epk” parameter, where only a single key value is called for.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; "><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; ">If this isn’t clear, feel free to ask a follow-up question.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; "><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; "> Best wishes,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; "> -- Mike<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; "><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size: 10pt; font-family: Tahoma, sans-serif; ">From:</span></b><span style="font-size: 10pt; font-family: Tahoma, sans-serif; ">
<a href="mailto:openid-specs-ab-bounces@lists.openid.net">openid-specs-ab-bounces@lists.openid.net</a> [<a href="mailto:openid-specs-ab-bounces@lists.openid.net">mailto:openid-specs-ab-bounces@lists.openid.net</a>]
<b>On Behalf Of </b>Dingwell, Robert A.<br>
<b>Sent:</b> Wednesday, June 27, 2012 9:04 AM<br>
<b>To:</b> <a href="mailto:openid-specs-ab@lists.openid.net">openid-specs-ab@lists.openid.net</a><br>
<b>Subject:</b> [Openid-specs-ab] JWK clarification<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size: 10.5pt; color: black; font-family: Calibri, sans-serif; ">If I remember correctly the initial version of the JWK format specified the format as being an array of keys but the latest version of the JWK spec appears
to have broken that idea out to where there is the key format and set format. <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size: 10.5pt; color: black; font-family: Calibri, sans-serif; "><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size: 10.5pt; color: black; font-family: Calibri, sans-serif; ">As both the client and the server have the option of providing signing and encrypting keys in JWK format are the urls for those keys intended to be a single
JWK or a JWK set? Seeing how the specifications states that if both X509 and JWK urls are provided they must be the same key makes me believe that the url would point to a single key. If it is a set how would one determine which key to use in the set considering
that the set could contain a number of keys that are marked as signing or encrypting keys?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size: 10.5pt; color: black; font-family: Calibri, sans-serif; "><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size: 10.5pt; color: black; font-family: Calibri, sans-serif; ">Rob<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size: 10.5pt; color: black; font-family: Calibri, sans-serif; "><o:p> </o:p></span></p>
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