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<a href="https://gitlab.com/dwmw2">David Woodhouse</a>
commented on a
<a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1460#note_688887982">discussion</a>:
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<p>I tried, but it was not possible; maybe I'm missing something. See the reproducer at <a href="https://gitlab.com/gnutls/gnutls/-/issues/594#note_651399228" data-original="https://gitlab.com/gnutls/gnutls/-/issues/594#note_651399228" data-link="false" data-link-reference="true" data-project="179611" data-issue="15278034" data-reference-type="issue" data-container="body" data-placement="top" title="Bring support for TPM 2.0" class="gfm gfm-issue has-tooltip">#594 (comment 651399228)</a></p>
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<p dir="auto">Er, I don't think that "reproducer" is showing what you think it is. That's just demonstrating what I'm <em>complaining</em> about here. In that link we see you creating a key with a parent generated one way, and then failing to load it when you generated the parent differently. Yes, that is well known; you can only load the key using the <em>same</em> parent. If you try to use <em>different</em> parent, that doesn't work.</p>
<p dir="auto">Even if you keep the key type the same and just vary the flags, like the FixedTPM and FixedParent flags, that still results in a different and incompatible key.</p>
<p dir="auto">That incompatibility is precisely <em>why</em> you have to stick to the exact parameters (including key type) that is defined as part of the key storage format!</p>
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