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<a href="https://gitlab.com/dueno">Daiki Ueno</a>
commented on a
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1399#note_525422352">lib/ext/key_share.c</a>:
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<pre style="margin: 0;"> <span id="LC679" 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;">have_creds_for_tls13</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="LC680" class="line" lang="c">                    <span class="k" style="font-weight: 600;">return</span> <span class="mi" style="color: #099;">0</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC681" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC682" class="line" lang="c">            <span class="cm" style="color: #998; font-style: italic;">/* write the total length later */</span></span>
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<pre style="margin: 0;">-<span id="LC683" class="line" lang="c">            <span class="n" style="color: #333;">lengthp</span> <span class="o" style="font-weight: 600;">=</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">extdata</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">data</span><span class="p">[</span><span class="n" style="color: #333;">extdata</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">length</span><span class="p">];</span></span>
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<pre style="margin: 0;">+<span id="LC682" class="line" lang="c">            <span class="n" style="color: #333;">length_pos</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extdata</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">length</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC683" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC684" class="line" lang="c">            <span class="n" style="color: #333;">ret</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;"> <span id="LC685" class="line" lang="c">                <span class="n" style="color: #333;">_gnutls_buffer_append_prefix</span><span class="p">(</span><span class="n" style="color: #333;">extdata</span><span class="p">,</span> <span class="mi" style="color: #099;">16</span><span class="p">,</span> <span class="mi" style="color: #099;">0</span><span class="p">);</span></span>
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<p dir="auto">Yes, the extension itself has a 2-byte length field, which we are adding here (with 0 as the content).</p>
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