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<a href="https://gitlab.com/trapperhoney">Craig</a>
commented on a
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1459#note_651192181">lib/x509/privkey.c</a>:
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<pre style="margin: 0;"> <span id="LC755" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* use the callback if any */</span></span>
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<pre style="margin: 0;"> <span id="LC756" 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_retrieve_pin</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">key</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">pin</span><span class="p">,</span> <span class="s" style="color: #d14;">"key:"</span><span class="p">,</span> <span class="s" style="color: #d14;">""</span><span class="p">,</span> <span class="mi" style="color: #099;">0</span><span class="p">,</span> <span class="n" style="color: #333;">pin</span><span class="p">,</span> <span class="k" style="font-weight: 600;">sizeof</span><span class="p">(</span><span class="n" style="color: #333;">pin</span><span class="p">));</span></span>
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<pre style="margin: 0;"> <span id="LC757" 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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758
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<pre style="margin: 0;">-<span id="LC758" class="line" lang="c"> <span class="n" style="color: #333;"><span class="idiff left deletion">password</span></span><span class="idiff deletion"> </span><span class="o" style="font-weight: 600;"><span class="idiff deletion">=</span></span><span class="idiff deletion"> </span><span class="n" style="color: #333;"><span class="idiff right deletion">pin</span></span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC758" class="line" lang="c"> <span class="n" style="color: #333;"><span class="idiff left addition">ret</span></span><span class="idiff addition"> </span><span class="o" style="font-weight: 600;"><span class="idiff addition">=</span></span><span class="idiff addition"> </span><span class="n" style="color: #333;"><span class="idiff addition">gnutls_x509_privkey_import_pkcs8</span></span><span class="p"><span class="idiff addition">(</span></span><span class="n" style="color: #333;"><span class="idiff addition">key</span></span><span class="p"><span class="idiff addition">,</span></span><span class="idiff addition"> </span><span class="n" style="color: #333;"><span class="idiff addition">data</span></span><span class="p"><span class="idiff addition">,</span></span><span class="idiff addition"> </span><span class="n" style="color: #333;"><span class="idiff addition">format</span></span><span class="p"><span class="idiff addition">,</span></span><span class="idiff addition"> </span><span class="n" style="color: #333;"><span class="idiff addition">pin</span></span><span class="p"><span class="idiff addition">,</span></span><span class="idiff addition"> </span><span class="n" style="color: #333;"><span class="idiff addition">flags</span></span><span class="p"><span class="idiff right addition">)</span>;</span></span>
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<pre style="margin: 0;"> <span id="LC759" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC760" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC761" 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="LC762" class="line" lang="c"> <span class="n" style="color: #333;">gnutls_x509_privkey_import_pkcs8</span><span class="p">(</span><span class="n" style="color: #333;">key</span><span class="p">,</span> <span class="n" style="color: #333;">data</span><span class="p">,</span> <span class="n" style="color: #333;">format</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC763" class="line" lang="c"> <span class="n" style="color: #333;">password</span><span class="p">,</span> <span class="n" style="color: #333;">flags</span><span class="p">);</span></span>
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<p dir="auto">Sorry if I'm missing something, but isn't the line in your proposed else statement what's happening on (unmodified) line 750? It tries the function-supplied password and then only tries the callback version if that failed and the GNUTLS_PKCS_PLAIN flag isn't set.</p>
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