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<a class="user-hover" rel="ian@iay.org.uk" id="email_ian@iay.org.uk" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=ian%40iay.org.uk" style="color:#326ca6;">Ian Young</a>
created <img src="https://issues.shibboleth.net/jira/images/icons/issuetypes/improvement.png" height="16" width="16" border="0" align="absmiddle" alt="Improvement"> <a style='color:#326ca6;text-decoration:none;' href='https://issues.shibboleth.net/jira/browse/SSPCPP-642'>SSPCPP-642</a>
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<a style='color:#326ca6;text-decoration:none;' href='https://issues.shibboleth.net/jira/browse/SSPCPP-642'><strong>improve generated EncryptionMethod metadata</strong></a>
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<strong style="font-weight:normal;color:#505050;">Issue Type:</strong>
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<img src="https://issues.shibboleth.net/jira/images/icons/issuetypes/improvement.png" height="16" width="16" border="0" align="absmiddle" alt="Improvement"> Improvement
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<strong style="font-weight:normal;color:#505050;">Affects Versions:</strong>
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2.5.3 </td>
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<strong style="font-weight:normal;color:#505050;">Assignee:</strong>
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<a class="user-hover" rel="cantor.2@osu.edu" id="email_cantor.2@osu.edu" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=cantor.2%40osu.edu" style="color:#326ca6;">Scott Cantor</a>
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<strong style="font-weight:normal;color:#505050;">Components:</strong>
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Configuration </td>
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<strong style="font-weight:normal;color:#505050;">Created:</strong>
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03/Feb/15 12:11 PM
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<strong style="font-weight:normal;color:#505050;">Description:</strong>
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<p style='margin-top:0;margin-bottom:10px;'>At present the SP generates the following metadata to describe its key transport capabilities:</p>
<div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent">
<pre class="code-java">
<EncryptionMethod Algorithm=<span class="code-quote">"http:<span class="code-comment">//www.w3.org/2009/xmlenc11#rsa-oaep"</span>/>
</span><EncryptionMethod Algorithm=<span class="code-quote">"http:<span class="code-comment">//www.w3.org/2001/04/xmlenc#rsa-oaep-mgf1p"</span>/></span></pre>
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<p style='margin-top:0;margin-bottom:10px;'>The meaning of the latter is well-defined as part of XMLENC 1.0. The former is also well-defined as part of XMLENC 1.1 as being functionally the same but of course different on the wire: MGF1 with SHA-1.</p>
<p style='margin-top:0;margin-bottom:10px;'>Scott reports on the dev list that he intended the former to mean "any valid parameters" however this is problematic because the SP does not support arbitrary MGF and digest algorithms. In addition, this interpretation is not profiled in (e.g.) the algorithm support specification.</p>
<p style='margin-top:0;margin-bottom:10px;'>Taking the two descriptors as both meaning RSA-OAEP with MGF1 and SHA-1, the #rsa-oaep descriptor is redundant and there's no gain to including it as the #rsa-oaep-mgf1p method is MTI in XMLENC 1.0. It can therefore, under that interpretation, be <br/>
suppressed to shorten the generated metadata.</p>
<p style='margin-top:0;margin-bottom:10px;'>It would also be desirable for the SP to generate at least one descriptor for an alternative #rsa-oaep based method, for example parameterised by MGF1 and SHA-256, for the benefit of people who wish to shun SHA-1 everywhere and in case the RSA-OAEP with MGF1 and SHA-1 combination proves to be weak at some point in the future. Space concerns may make us wary of including the whole slew of alternatives including all the different digest functions, though.</p>
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<strong style="font-weight:normal;color:#505050;">Project:</strong>
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<a style="color:#326ca6;" href="https://issues.shibboleth.net/jira/browse/SSPCPP">Shibboleth SP - C++</a>
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<strong style="font-weight:normal;color:#505050;">Priority:</strong>
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<img src="https://issues.shibboleth.net/jira/images/icons/priorities/minor.png" height="16" width="16" border="0" align="absmiddle" alt="Minor"> Minor
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<strong style="font-weight:normal;color:#505050;">Reporter:</strong>
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<a class="user-hover" rel="ian@iay.org.uk" id="email_ian@iay.org.uk" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=ian%40iay.org.uk" style="color:#326ca6;">Ian Young</a>
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