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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/650#note_120065848">lib/auth/cert.c</a>:
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188
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<pre style="margin: 0;"> <span id="LC193" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">         * then send that one.</span></span>
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<pre style="margin: 0;"> <span id="LC194" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">         */</span></span>
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190
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<pre style="margin: 0;"> <span id="LC195" class="line" lang="c">    <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">cred</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">ncerts</span> <span class="o" style="font-weight: 600;">==</span> <span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">&&</span></span>
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<td class="diff-line-num old old_line" data-linenumber="191" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
191
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<td class="diff-line-num new_line old" data-linenumber="196" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC191" class="line" lang="c">            <span class="p">(</span><span class="n" style="color: #333;">data_size</span> <span class="o" style="font-weight: 600;">==</span> <span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">||</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;">flags</span> <span class="o" style="font-weight: 600;">&</span> <span class="n" style="color: #333;">GNUTLS_FORCE_CLIENT_CERT</span><span class="p">)))</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC196" class="line" lang="c">        <span class="p">(</span><span class="n" style="color: #333;">data_size</span> <span class="o" style="font-weight: 600;">==</span> <span class="mi" style="color: #099;">0</span></span>
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<pre style="margin: 0;">+<span id="LC197" class="line" lang="c">         <span class="o" style="font-weight: 600;">||</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;">flags</span> <span class="o" style="font-weight: 600;">&</span> <span class="n" style="color: #333;">GNUTLS_FORCE_CLIENT_CERT</span><span class="p">)))</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC198" class="line" lang="c">            <span class="c1" style="color: #998; font-style: italic;">// Do a cert type check</span></span>
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<pre style="margin: 0;">+<span id="LC199" class="line" lang="c">            <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">cred</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">certs</span><span class="p">[</span><span class="mi" style="color: #099;">0</span><span class="p">].</span><span class="n" style="color: #333;">cert_list_length</span> <span class="o" style="font-weight: 600;">></span> <span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">&&</span></span>
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<p dir="auto">Since you added that code which adds a public key into the credential structure I think you are in better position to understand the options that it introduces. The best is to check them when adding the public key rather than checking it on every use.</p>
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