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<a href="https://gitlab.com/npocs">Norbert Pocs</a>
commented on a
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1350#note_451038762">lib/handshake.c</a>:
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<pre style="margin: 0;"> <span id="LC2213" class="line" lang="c"></span>
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<td class="diff-line-num old_line" data-linenumber="2214" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC2214" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#ifdef TLS13_APPENDIX_D4</span></span>
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<td class="diff-line-num old_line" data-linenumber="2215" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC2215" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">max_ver</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>
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2216
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<pre style="margin: 0;">-<span id="LC2216" class="line" lang="c"> <span class="n" style="color: #333;">session</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">security_parameters</span><span class="p">.</span><span class="n" style="color: #333;">session_id_size</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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<td class="diff-line-num new old_line" data-linenumber="2217" 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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<td class="diff-line-num new new_line" data-linenumber="2216" 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="LC2216" class="line" lang="c"> <span class="n" style="color: #333;">session</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;"><span class="idiff left">internals</span></span><span class="p"><span class="idiff">.</span></span><span class="n" style="color: #333;"><span class="idiff right">resumed_</span>security_parameters</span><span class="p">.</span><span class="n" style="color: #333;">session_id_size</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="LC2217" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC2218" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* Under TLS1.3 we generate a random session ID to make</span></span>
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<pre style="margin: 0;"> <span id="LC2219" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * the TLS1.3 session look like a resumed TLS1.2 session */</span></span>
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<pre style="margin: 0;">-<span id="LC2220" 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_generate_session_id</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;">security_parameters</span><span class="p">.</span></span>
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<pre style="margin: 0;">+<span id="LC2220" 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_generate_session_id</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;"><span class="idiff left">internals</span></span><span class="p"><span class="idiff">.</span></span><span class="n" style="color: #333;"><span class="idiff right">resumed_</span>security_parameters</span><span class="p">.</span></span>
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<p dir="auto">The <code>tlsext-decoding</code> passing now. (haven't pushed yet)
There will be problem with the <code>prf</code>, because the output keeps changing everytime. The session_id is generated randomly, therefore it can not be compared with a static value.</p>
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