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<a href="https://gitlab.com/nmav">Nikos Mavrogiannopoulos</a>
started a new discussion
on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/775#note_112778628">lib/handshake-tls13.c</a>:
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<pre style="margin: 0;"> <span id="LC93" class="line" lang="c"> <span class="k" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">STATE101</span><span class="p">:</span></span>
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<pre style="margin: 0;">-<span id="LC93" 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="LC94" class="line" lang="c"> <span class="n" style="color: #333;">generate_and_set_hs_traffic_keys</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="LC94" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* Note that we check IN_FLIGHT, not ACCEPTED</span></span>
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<pre style="margin: 0;">+<span id="LC95" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * here. This is because the client sends early data</span></span>
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<pre style="margin: 0;">+<span id="LC96" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * speculatively. */</span></span>
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<pre style="margin: 0;">+<span id="LC97" 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;">hsk_flags</span> <span class="o" style="font-weight: 600;">&</span> <span class="n" style="color: #333;">HSK_EARLY_DATA_IN_FLIGHT</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC98" 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;">_tls13_write_connection_state_init</span><span class="p">(</span><span class="n" style="color: #333;">session</span><span class="p">,</span> <span class="n" style="color: #333;">STAGE_EARLY</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC99" 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="LC100" class="line" lang="c"> <span class="n" style="color: #333;">_gnutls_epoch_bump</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="LC101" 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_epoch_dup</span><span class="p">(</span><span class="n" style="color: #333;">session</span><span class="p">,</span> <span class="n" style="color: #333;">EPOCH_WRITE_CURRENT</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC103" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC104" class="line" lang="c"> <span class="n" style="color: #333;">STATE</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">STATE101</span><span class="p">;</span></span>
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<pre style="margin: 0;">-<span id="LC96" class="line" lang="c"> <span class="n" style="color: #333;">IMED_RET_FATAL</span><span class="p">(</span><span class="s" style="color: #d14;">"<span class="idiff left right">generate session</span> keys"</span><span class="p">,</span> <span class="n" style="color: #333;">ret</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="LC105" class="line" lang="c"> <span class="n" style="color: #333;">IMED_RET_FATAL</span><span class="p">(</span><span class="s" style="color: #d14;">"<span class="idiff left right">set early traffic</span> keys"</span><span class="p">,</span> <span class="n" style="color: #333;">ret</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">should these two lines enter the if block? <code>ret</code> will have a value set to zero, so it works, but it feels like easy for a change to break this part.</p>
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