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<a href="https://gitlab.com/Vrancken">Tom</a>
started a new discussion
on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/774#note_109084651">lib/handshake.c</a>:
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<pre style="margin: 0;">-<span id="LC549" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* if we are resuming then the KX seen doesn't match the original */</span></span>
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<pre style="margin: 0;">+<span id="LC549" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* sanity check:</span></span>
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<pre style="margin: 0;">+<span id="LC550" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * we see TLS1.3 negotiated but no key share was sent */</span></span>
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<pre style="margin: 0;">+<span id="LC551" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">ver</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="LC552" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">unlikely</span><span class="p">(</span><span class="o" style="font-weight: 600;">!</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;">hsk_flags</span> <span class="o" style="font-weight: 600;">&</span> <span class="n" style="color: #333;">HSK_PSK_KE_MODE_PSK</span><span class="p">)</span> <span class="o" style="font-weight: 600;">&&</span></span>
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<pre style="margin: 0;">+<span id="LC553" class="line" lang="c"> <span class="o" style="font-weight: 600;">!</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;">hsk_flags</span> <span class="o" style="font-weight: 600;">&</span> <span class="n" style="color: #333;">HSK_KEY_SHARE_RECEIVED</span><span class="p">)))</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC554" 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;">GNUTLS_E_MISSING_EXTENSION</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC555" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC556" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC557" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* Under TLS1.3 this returns a KX which matches the negotiated</span></span>
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<pre style="margin: 0;">+<span id="LC558" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * groups from the key shares; if we are resuming then the KX seen</span></span>
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<pre style="margin: 0;">+<span id="LC559" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * here doesn't match the original session. */</span></span>
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<pre style="margin: 0;"> <span id="LC560" 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_FALSE</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC561" class="line" lang="c"> <span class="n" style="color: #333;">kx</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">gnutls_kx_get</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="LC562" class="line" lang="c"> <span class="k" style="font-weight: 600;">else</span></span>
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<pre style="margin: 0;">+<span id="LC563" class="line" lang="c"> <span class="n" style="color: #333;">kx</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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<p dir="auto"><code>gnutls_kx_get()</code> returns a <code>gnutls_kx_algorithm_t</code> type. I think it would be more readable to use constants from this type instead of constant literals. In this case <code>GNUTLS_KX_UNKNOWN</code> instead of <code>0</code>.</p>
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