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<a href="https://gitlab.com/asosedkin" style="color: #1068bf;">Alexander Sosedkin</a> created an issue: <a href="https://gitlab.com/gnutls/gnutls/-/issues/1397" style="color: #1068bf;">#1397</a>
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<a id="user-content-description-of-problem" class="anchor" href="#description-of-problem" aria-hidden="true" style="color: #1068bf; margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Description of problem:</h2>
<p dir="auto" style="color: #303030; margin: 0 0 16px;" align="initial">compress_certificate is being set on ServerHello</p>
<h2 dir="auto" style="font-size: 1.5em; font-weight: 600; padding-bottom: 0.3em; border-bottom-width: 1px; border-bottom-color: #eaeaea; border-bottom-style: solid; color: #303030; margin: 24px 0 16px;" align="initial">
<a id="user-content-version-of-gnutls-used" class="anchor" href="#version-of-gnutls-used" aria-hidden="true" style="color: #1068bf; margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Version of gnutls used:</h2>
<p dir="auto" style="color: #303030; margin: 0 0 16px;" align="initial">master</p>
<h2 dir="auto" style="font-size: 1.5em; font-weight: 600; padding-bottom: 0.3em; border-bottom-width: 1px; border-bottom-color: #eaeaea; border-bottom-style: solid; color: #303030; margin: 24px 0 16px;" align="initial">
<a id="user-content-how-reproducible" class="anchor" href="#how-reproducible" aria-hidden="true" style="color: #1068bf; margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>How reproducible:</h2>
<p dir="auto" style="color: #303030; margin: 0 0 16px;" align="initial">reliably</p>
<p dir="auto" style="color: #303030; margin: 0 0 16px;" align="initial">Steps to Reproduce:</p>
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<li style="margin-top: 0; line-height: 1.6em; margin-left: 25px; padding-left: 3px;"><code style='font-size: 90%; color: #1f1f1f; word-wrap: break-word; background-color: #f0f0f0; border-radius: 4px; margin-top: 0; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>gnutls-serv -a --x509certfile cert.pem --x509keyfile key.pem --compress-cert zlib -d9</code></li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;"><code style='font-size: 90%; color: #1f1f1f; word-wrap: break-word; background-color: #f0f0f0; border-radius: 4px; margin-top: 0; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>gnutls-cli localhost:5556</code></li>
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<h2 dir="auto" style="font-size: 1.5em; font-weight: 600; padding-bottom: 0.3em; border-bottom-width: 1px; border-bottom-color: #eaeaea; border-bottom-style: solid; color: #303030; margin: 24px 0 16px;" align="initial">
<a id="user-content-actual-results" class="anchor" href="#actual-results" aria-hidden="true" style="color: #1068bf; margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Actual results:</h2>
<p dir="auto" style="color: #303030; margin: 0 0 16px;" align="initial">|<4>| EXT[0x1f16840]: Preparing extension (Compress Certificate/27) for 'TLS 1.3 server hello'</p>
<h2 dir="auto" style="font-size: 1.5em; font-weight: 600; padding-bottom: 0.3em; border-bottom-width: 1px; border-bottom-color: #eaeaea; border-bottom-style: solid; color: #303030; margin: 24px 0 16px;" align="initial">
<a id="user-content-expected-results" class="anchor" href="#expected-results" aria-hidden="true" style="color: #1068bf; margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Expected results:</h2>
<p dir="auto" style="color: #303030; margin: 0;" align="initial"><code style='font-size: 90%; color: #1f1f1f; word-wrap: break-word; background-color: #f0f0f0; border-radius: 4px; margin-top: 0; font-weight: inherit; font-family: "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>compress_certificate</code> only being encountered on ClientHello and CertificateRequest, not ServerHello
(<a href="https://datatracker.ietf.org/doc/html/rfc8879#section-3" rel="nofollow noreferrer noopener" target="_blank" style="color: #1068bf;">https://datatracker.ietf.org/doc/html/rfc8879#section-3</a>).</p>
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