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<a href="https://gitlab.com/Vrancken">Tom</a>
commented on a discussion
on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/650#note_119833840">lib/auth/cert.c</a>:
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<pre style="margin: 0;">+<span id="LC679" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC680" class="line" lang="c"></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="kt" style="color: #458; font-weight: 600;">int</span></span>
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<pre style="margin: 0;"> <span id="LC683" class="line" lang="c"><span class="nf" style="color: #900; font-weight: 600;">_gnutls_gen_cert_client_crt</span><span class="p">(</span><span class="n" style="color: #333;">gnutls_session_t</span> <span class="n" style="color: #333;">session</span><span class="p">,</span> <span class="n" style="color: #333;">gnutls_buffer_st</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">data</span><span class="p">)</span></span>
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580
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<pre style="margin: 0;"> <span id="LC684" class="line" lang="c"><span class="p">{</span></span>
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<pre style="margin: 0;">-<span id="LC581" class="line" lang="c"> <span class="k" style="font-weight: 600;">switch</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;">client_ctype</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">-<span id="LC582" class="line" lang="c"> <span class="k" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">GNUTLS_CRT_X509</span><span class="p">:</span></span>
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583
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<pre style="margin: 0;">-<span id="LC583" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">gen_x509_crt</span><span class="p">(</span><span class="n" style="color: #333;">session</span><span class="p">,</span> <span class="n" style="color: #333;">data</span><span class="p">);</span></span>
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584
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<pre style="margin: 0;">-<span id="LC584" class="line" lang="c"> <span class="nl">default:</span></span>
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<pre style="margin: 0;">-<span id="LC585" class="line" lang="c"> <span class="n" style="color: #333;">gnutls_assert</span><span class="p">();</span></span>
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<pre style="margin: 0;">-<span id="LC586" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">GNUTLS_E_INTERNAL_ERROR</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC685" class="line" lang="c"> <span class="n" style="color: #333;">gnutls_certificate_type_t</span> <span class="n" style="color: #333;">cert_type</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC686" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC687" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Retrieve the (negotiated) certificate type for the client</span></span>
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<pre style="margin: 0;">+<span id="LC688" class="line" lang="c"> <span class="n" style="color: #333;">cert_type</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">gnutls_certificate_type_get2</span><span class="p">(</span><span class="n" style="color: #333;">session</span><span class="p">,</span> <span class="n" style="color: #333;">GNUTLS_CTYPE_CLIENT</span><span class="p">);</span></span>
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<p dir="auto">I have a nice solution that brings us best of both worlds. Hope you like it too. I've created a private inline copy of the function that can be called internally. This private function is then called from the API function. That gives us the optimization that you want and also a function that abstracts the internal data structure away. I think the second benefit of using this function is that it implements logic to retrieve the "ours" and "peers" certificate types. As you mentioned in one of your other comments these modes can be used to optimize some of the code paths for certificate handling. Please take a look at the code and tell me what you think of it.</p>
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