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<a href="https://gitlab.com/nmav">Nikos Mavrogiannopoulos</a>
commented on a discussion
on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/765#note_106127453">lib/handshake.c</a>:
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<pre style="margin: 0;">-<span id="LC511" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * earlier, as TLS1.3 uses a different set of ciphersuites, and</span></span>
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<pre style="margin: 0;">-<span id="LC512" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * thus we cannot fallback.</span></span>
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<pre style="margin: 0;">-<span id="LC513" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> */</span></span>
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<pre style="margin: 0;">-<span id="LC514" class="line" lang="c"> <span class="n" style="color: #333;">ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">_gnutls_negotiate_version</span><span class="p">(</span><span class="n" style="color: #333;">session</span><span class="p">,</span> <span class="n" style="color: #333;">major</span><span class="p">,</span> <span class="n" style="color: #333;">minor</span><span class="p">,</span> <span class="mi" style="color: #099;">0</span><span class="p">);</span></span>
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<pre style="margin: 0;">-<span id="LC515" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">ret</span> <span class="o" style="font-weight: 600;"><</span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">-<span id="LC516" class="line" lang="c"> <span class="n" style="color: #333;">gnutls_assert</span><span class="p">();</span></span>
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<pre style="margin: 0;">-<span id="LC517" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">ret</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC508" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* to catch any changes in the TLS protocol negotiation */</span></span>
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<pre style="margin: 0;">+<span id="LC509" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">session</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">internals</span><span class="p">.</span><span class="n" style="color: #333;">resumed</span> <span class="o" style="font-weight: 600;">!=</span> <span class="n" style="color: #333;">RESUME_TRUE</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC510" class="line" lang="c"> <span class="n" style="color: #333;">new_max</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">_gnutls_version_max</span><span class="p">(</span><span class="n" style="color: #333;">session</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC511" class="line" lang="c"> <span class="n" style="color: #333;">old_vers</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">get_version</span><span class="p">(</span><span class="n" style="color: #333;">session</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC512" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC513" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">old_vers</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">tls13_sem</span> <span class="o" style="font-weight: 600;">||</span> <span class="p">(</span><span class="n" style="color: #333;">new_max</span> <span class="o" style="font-weight: 600;">&&</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">new_max</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">tls13_sem</span><span class="p">))</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC514" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* Here we need to renegotiate the version since the callee might</span></span>
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<pre style="margin: 0;">+<span id="LC515" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * have disabled some TLS versions. This will not work for protocols</span></span>
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<pre style="margin: 0;">+<span id="LC516" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * > TLS1.3.</span></span>
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<p dir="auto">It is for future protocols to TLS1.3. I've updated the text for more clarity.</p>
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