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<p>My understanding is that later Microsoft OSes will accept
installs of apps signed with SHA-1 certificates for a limited
amount of time, but only if they were signed prior to 2016-01-01.
So what you describe applies to later Microsoft OSes, not XP SP2.
That OS knows nothing of any of this, and has no support or SHA-2
certificates (hence will fail with our latest apps that are signed
using SHA-2). Per <a
href="http://social.technet.microsoft.com/wiki/contents/articles/32288.windows-enforcement-of-authenticode-code-signing-and-timestamping.aspx">Microsoft</a>:</p>
<p>"I am still targeting software for distribution to Windows XP
SP1, SP2 and Windows Server 2003. How might I be affected by these
requirements?<br>
<br>
The deprecation policies will not be targeted at those systems.
Those systems however do not have SHA-2 support and no patch is
available to add that support either. Developers can use SHA-1
code signing certificates and SHA-1 file hashes to sign their
code. SHA-1 timestamps should be used as well."</p>
<p>and:</p>
<p>"Windows trusts SHA1 (if timestamped prior to 1/1/2016) and SHA-2
(any timestamp)" for Code Signing certificates.</p>
<p>Nevertheless, there seems to be a lot of confusion about what all
of this really means.<br>
</p>
<div class="moz-cite-prefix">On 12/29/2015 3:53 AM, Gervase Markham
wrote:<br>
</div>
<blockquote cite="mid:5682743B.5000206@mozilla.org" type="cite">
<pre wrap="">On 23/12/15 21:01, R Kent James wrote:
</pre>
<blockquote type="cite">
<pre wrap="">One possibility is to drop support completely for XP SP2 or earlier. The
other option is to have additional builds, signed with older
certificates, that will install on XP SP2 or earlier. That solution
might only be valid for another year or so, however.
</pre>
</blockquote>
<pre wrap="">
If you are going to make such builds, they need to exist before midnight
on December 31st :-) You may be able to use existing builds, of course.
Gerv
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</blockquote>
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