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<a href="https://gitlab.com/AmarOk1412">Sébastien Blin</a>
commented:
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<p>The numbers you present seem quite high for a handshake.</p>
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<p dir="auto">In fact it's the time for the whole connection not just the handshake, but yeah it's indeed quite high</p>
<p dir="auto">Ok, it will take some time for me to test, I have a big todo list for now, but I think I will take some time to do a bisect to get the commit (but first I will list here the negotiated ciphers used)</p>
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<p>gnutls-cli --benchmark-tls-kx</p>
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<p dir="auto">Not sure I will be able to get the difference for Android?</p>
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<p>Do you use some special mode (e.g., FIPS), and specific ciphersuites? What ciphersuites do you see in the handshakes you describe?</p>
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<p dir="auto">For the ciphersuites I will give more details asap, but it's not really special. For example between a GNU/Linux and Android (8 so without the issue) with 3.6.10 (both sides):</p>
<pre class="code highlight js-syntax-highlight plaintext" lang="plaintext" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">[1578615382.359|38541|tls_session.cpp :891 ] [TLS] session established: (TLS1.3)-(DHE-FFDHE8192)-(RSA-PSS-RSAE-SHA384)-(AES-256-GCM)</span>
<span id="LC2" class="line" lang="plaintext">[1578615382.359|38541|sips_transport_ice.cpp:530 ] [TLS] using cipher TLS_DHE_RSA_AES_256_GCM_SHA384 (0x009F)</span></code></pre>
<p dir="auto">I will post more details as soon as possible.</p>
<p dir="auto">However, I talked with the dev for iOS and she reproduces the issue, so we also downgrade gnutls on iOS (but not macos).</p>
<p dir="auto">So:</p>
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<li>I will post the ciphersuites with different devices and gnutls versions</li>
<li>Will try to bisect to locate the bad commit (yeay only ~150 commits)</li>
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