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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_106126844">lib/handshake.c</a>:
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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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<td class="diff-line-num new new_line" data-linenumber="514" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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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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<pre style="margin: 0;">+<span id="LC517" 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="LC518" 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="LC519" 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>
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<pre style="margin: 0;">+<span id="LC520" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">gnutls_assert_val</span><span class="p">(</span><span class="n" style="color: #333;">ret</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC521" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC522" class="line" lang="c"> <span class="n" style="color: #333;">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="LC523" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">old_vers</span> <span class="o" style="font-weight: 600;">!=</span> <span class="n" style="color: #333;">vers</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC524" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* at this point we need to regenerate the random value to</span></span>
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<pre style="margin: 0;">+<span id="LC525" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * avoid the peer detecting this session as a rollback</span></span>
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<pre style="margin: 0;">+<span id="LC526" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * attempt. */</span></span>
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<pre style="margin: 0;">+<span id="LC527" 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_gen_server_random</span><span class="p">(</span><span class="n" style="color: #333;">session</span><span class="p">,</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 class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">id</span><span class="p">);</span></span>
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<p dir="auto">Done</p>
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