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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_119678988">lib/auth/cert.c</a>:
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<pre style="margin: 0;">+<span id="LC662" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * <length++certificate> where</span></span>
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<pre style="margin: 0;">+<span id="LC663" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * length = 3 bytes and</span></span>
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<pre style="margin: 0;">+<span id="LC664" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * certificate = length bytes.</span></span>
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<pre style="margin: 0;">+<span id="LC665" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> */</span></span>
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<pre style="margin: 0;">+<span id="LC666" 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_prefix</span><span class="p">(</span><span class="n" style="color: #333;">data</span><span class="p">,</span> <span class="mi" style="color: #099;">24</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC667" class="line" lang="c"> <span class="n" style="color: #333;">apr_cert_list</span><span class="p">[</span><span class="mi" style="color: #099;">0</span><span class="p">].</span><span class="n" style="color: #333;">cert</span><span class="p">.</span><span class="n" style="color: #333;">data</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC668" class="line" lang="c"> <span class="n" style="color: #333;">apr_cert_list</span><span class="p">[</span><span class="mi" style="color: #099;">0</span><span class="p">].</span><span class="n" style="color: #333;">cert</span><span class="p">.</span><span class="n" style="color: #333;">size</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC669" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC670" 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="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="LC671" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC672" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">data</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">length</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC673" class="line" lang="c"> <span class="p">}</span> <span class="k" style="font-weight: 600;">else</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC674" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* We found more than one certificate. In that case we don't know</span></span>
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<pre style="margin: 0;">+<span id="LC675" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * which one to send, therefore we send nothing.</span></span>
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<pre style="margin: 0;">+<span id="LC676" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> */</span></span>
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<pre style="margin: 0;">+<span id="LC677" 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;">GNUTLS_E_INVALID_REQUEST</span><span class="p">);</span> <span class="c1" style="color: #998; font-style: italic;">// TODO maybe introduce new error type GNUTLS_E_RAWPK_TOO_MANY_KEYS_GIVEN?</span></span>
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<p dir="auto">It actually is an impossible situation. By using the rawpk API the cert list length of a raw public-key is always set to 1. I guess I was too cautious here with this extra check.</p>
<p dir="auto">Shall I insert an <code>assert</code> statement to reflect the invariant that <code>apr_cert_list_length == 1</code> should always hold? Or shall I just remove the if/else statement?</p>
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