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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <p style="margin: 10px 0 0 0; margin-top: 0">Hello again. This looks like it might be a recurrence of the issues you encounted in <a href="https://issues.shibboleth.net/jira/browse/XSTJ-83" title="file signed with xmlsectool-2.0.0 failed to verify with xmlsectool-2.0.0" class="issue-link" data-issue-key="XSTJ-83" style="color: #3b73af; text-decoration: none"><del>XSTJ-83</del></a>. You may recall we didn't so much as fix those as observe that they had resolved themselves in xmlsectool 3 under Java 11, so I still don't know what the issue was there.</p> <p style="margin: 10px 0 0 0">I can confirm that I can again reproduce the issue you are seeing here (in the sense that verifying the output file's signature fails for me). However, I wasn't able to perform the signature operation so it is still the case that I have never reproduced this issue on an RSA key, or on an EC key I generated myself. So one suspicion has to be that it's something about the key you are using: unfortunately, if that's the case, the bug is probably outside our codebase.</p> <p style="margin: 10px 0 0 0">I'd suggest trying the following:</p>
<ul>
<li>Create a 2048-bit RSA key/cert and try the signature and verify operations with those. If you see a failure, it might be something particular about your operating environment or about the input file. If you don't see a failure, that probably isolates the issue to the handling of EC keys.</li>
</ul>
<ul>
<li>Create a NEW EC key/cert and verify that the issue recurs with those. If it does, attach both the new key and cert here <em>and clearly specify the exact steps you used to create them</em>.</li>
</ul> <p style="margin: 10px 0 0 0">I will mention another couple of things you could try, but they are probably long shots:</p>
<ul>
<li>I note that the input file doesn't have a prelude. Try adding the same one that appears in the output file (<tt><?xml version="1.0" encoding="UTF-8" standalone="no"?></tt>) and see if that makes a difference.</li>
</ul>
<ul>
<li>Try removing the document element's <tt>xsi:schemaLocation</tt> attribute and running the test again. Sometimes, schemas have aspects which change the way the document hash is computed.</li>
</ul>
<ul>
<li>Try editing the input file to close all empty elements, e.g., <tt><ts:byName field="locality"></ts:byName></tt> becomes <tt><ts:byName field="locality"/></tt>.</li>
</ul>
<ul>
<li>Try manually removing the signature from the signed document and sign <em>that</em> to see if the re-signed document's signature validates.</li>
</ul>
<ul>
<li>Try discarding hunks of content until you have a minimum failing example: ideally, just a couple of elements.</li>
</ul>
<ul>
<li>Try not selecting the digest or signature algorithm in either the sign or verify operations (I think you're using the default values anyway).</li>
</ul> <p style="margin: 10px 0 0 0">>Out of curiosity, if the signature verification failed, how do you know whether the signature isn't valid for the digest, or the digest doesn't match the document?</p> <p style="margin: 10px 0 0 0">It doesn't look like xmlsectool has much to assist with that; I guess it hasn't come up before. Some of our other signature code (e.g., in the MDA) does have some code to help with diagnosing this kind of issue, so I guess we could transplant it if necessary (and if it translates across, it may not).</p> </td>
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