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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/711#note_92364795">lib/handshake-tls13.c</a>:
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<td class="diff-line-num new new_line" data-linenumber="194" 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">
194
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<pre style="margin: 0;">+<span id="LC194" class="line" lang="c"> <span class="n" style="color: #333;">_gnutls_write_uint24</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 class="n" style="color: #333;">prf</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">output_size</span><span class="p">,</span> <span class="n" style="color: #333;">finished</span><span class="o" style="font-weight: 600;">+</span><span class="mi" style="color: #099;">1</span><span class="p">);</span></span>
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<td class="diff-line-num new old_line" data-linenumber="167" 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="195" 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">
195
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<pre style="margin: 0;">+<span id="LC195" class="line" lang="c"></span>
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<td class="diff-line-num new new_line" data-linenumber="196" 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">
196
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<pre style="margin: 0;">+<span id="LC196" 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_buffer_append_data</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</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;">handshake_hash_buffer</span><span class="p">,</span> <span class="n" style="color: #333;">finished</span><span class="p">,</span></span>
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<td class="diff-line-num new new_line" data-linenumber="197" 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">
197
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<pre style="margin: 0;">+<span id="LC197" class="line" lang="c"> <span class="n" style="color: #333;">TLS_HANDSHAKE_HEADER_SIZE</span><span class="o" style="font-weight: 600;">+</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 class="n" style="color: #333;">prf</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">output_size</span><span class="p">);</span></span>
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<td class="diff-line-num new new_line" data-linenumber="198" 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">
198
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<pre style="margin: 0;">+<span id="LC198" 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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<td class="diff-line-num new new_line" data-linenumber="199" 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">
199
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<pre style="margin: 0;">+<span id="LC199" 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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<td class="diff-line-num new new_line" data-linenumber="200" 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">
200
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<pre style="margin: 0;">+<span id="LC200" class="line" lang="c"></span>
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<td class="diff-line-num new new_line" data-linenumber="201" 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">
201
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<pre style="margin: 0;">+<span id="LC201" 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_derive_secret</span><span class="p">(</span><span class="n" style="color: #333;">session</span><span class="p">,</span> <span class="n" style="color: #333;">RMS_MASTER_LABEL</span><span class="p">,</span> <span class="k" style="font-weight: 600;">sizeof</span><span class="p">(</span><span class="n" style="color: #333;">RMS_MASTER_LABEL</span><span class="p">)</span><span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">1</span><span class="p">,</span></span>
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<td class="diff-line-num new new_line" data-linenumber="202" 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">
202
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<pre style="margin: 0;">+<span id="LC202" 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;">internals</span><span class="p">.</span><span class="n" style="color: #333;">handshake_hash_buffer</span><span class="p">.</span><span class="n" style="color: #333;">data</span><span class="p">,</span></span>
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<td class="diff-line-num new new_line" data-linenumber="203" 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="LC203" 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;">internals</span><span class="p">.</span><span class="n" style="color: #333;">handshake_hash_buffer</span><span class="p">.</span><span class="n" style="color: #333;">length</span><span class="p">,</span></span>
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<td class="diff-line-num new new_line" data-linenumber="204" 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="LC204" 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;">key</span><span class="p">.</span><span class="n" style="color: #333;">proto</span><span class="p">.</span><span class="n" style="color: #333;">tls13</span><span class="p">.</span><span class="n" style="color: #333;">temp_secret</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC205" 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;">key</span><span class="p">.</span><span class="n" style="color: #333;">proto</span><span class="p">.</span><span class="n" style="color: #333;">tls13</span><span class="p">.</span><span class="n" style="color: #333;">ap_rms</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC206" 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="LC207" 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="LC208" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC209" 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;">internals</span><span class="p">.</span><span class="n" style="color: #333;">handshake_hash_buffer</span><span class="p">.</span><span class="n" style="color: #333;">length</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">spos</span><span class="p">;</span></span>
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<p dir="auto">it looks nice functionally but I don't think it is a good idea to set the value of <code>session->internals.handshake_hash_buffer_client_finished_len</code> prior to the finished message being received. Indeed on that particular function we are predicting what it will be to calculate rms, but should we set its value for anyone else to use? grepping through the code it seems that in no other case this value is being used, so it is a kind of philosophical question which approach is better. I prefer the current one because I find it nicer to contain the side effects of this prediction, but I'd be happy to discuss that.</p>
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