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<a href="https://gitlab.com/dueno">Daiki Ueno</a>
<a href="https://gitlab.com/gnutls/gnutls/-/issues/1717#note_2636736894">commented</a>:
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<p dir="auto" style="color: #3a383f; margin: 0;" align="initial">I took a closer look at it and now suspect a logic error in the current key update code, not related to threading. The "decryption failed" errors indicate that the receiver of the message doesn't have the correct decryption key yet, and this is the case when the peer sends a data encrypted with an old key, while the receiving key is already updated. I tried to rework the logic to be more in line with the RFC (<a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1990" data-reference-type="merge_request" data-original="!1990" data-link="false" data-link-reference="false" data-merge-request="400516186" data-project="179611" data-project-path="gnutls/gnutls" data-iid="1990" data-container="body" data-placement="top" title="key_update: rework the rekeying logic" class="gfm gfm-merge_request" style="margin-top: 0;">!1990</a>), and it seems to fix the errors in the reproducer.</p>
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