<blockquote>
<p>deltarpm would also need to be changed to strip away all header+payload digests/signatures from the signature header.</p>
</blockquote>
<p>On that note... the grand plan is to drop header+payload digests/signatures from rpm, except an legacy compatibility option. Adding a strong (and signed if package is signed) digest for the payload alone was a pre-requisite for that, and it's also the reason the verify code is written the way it is: for packages built on rpm >= 4.14 you can already disable header+payload digests/signatures without sacrificing security at all. And in this setting, whether the payload is compressed or not is ultimately totally uninteresting.</p>

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