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<a href="https://gitlab.com/dueno">Daiki Ueno</a>
commented on a
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1367#note_534253834">lib/x509/x509_ext.c</a>:
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<pre style="margin: 0;">+<span id="LC3602" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">get_sigalg_for_sha1</span><span class="p">(</span><span class="n" style="color: #333;">sig_algo</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC3603" class="line" lang="c"> <span class="k" style="font-weight: 600;">case</span> <span class="mi" style="color: #099;">3</span><span class="p">:</span> <span class="cm" style="color: #998; font-style: italic;">/* sha224 */</span></span>
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<pre style="margin: 0;">+<span id="LC3604" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">get_sigalg_for_sha224</span><span class="p">(</span><span class="n" style="color: #333;">sig_algo</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC3605" class="line" lang="c"> <span class="k" style="font-weight: 600;">case</span> <span class="mi" style="color: #099;">4</span><span class="p">:</span> <span class="cm" style="color: #998; font-style: italic;">/* sha256 */</span></span>
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<pre style="margin: 0;">+<span id="LC3606" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">get_sigalg_for_sha256</span><span class="p">(</span><span class="n" style="color: #333;">sig_algo</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC3607" class="line" lang="c"> <span class="k" style="font-weight: 600;">case</span> <span class="mi" style="color: #099;">5</span><span class="p">:</span> <span class="cm" style="color: #998; font-style: italic;">/* sha384 */</span></span>
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<pre style="margin: 0;">+<span id="LC3608" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">get_sigalg_for_sha384</span><span class="p">(</span><span class="n" style="color: #333;">sig_algo</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC3609" class="line" lang="c"> <span class="k" style="font-weight: 600;">case</span> <span class="mi" style="color: #099;">6</span><span class="p">:</span> <span class="cm" style="color: #998; font-style: italic;">/* sha512 */</span></span>
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<pre style="margin: 0;">+<span id="LC3610" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">get_sigalg_for_sha512</span><span class="p">(</span><span class="n" style="color: #333;">sig_algo</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC3611" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC3612" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC3613" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC3614" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="nf" style="color: #900; font-weight: 600;">write_sigalg</span><span class="p">(</span><span class="n" style="color: #333;">gnutls_sign_algorithm_t</span> <span class="n" style="color: #333;">sigalg</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">uint8_t</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">out</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC3615" class="line" lang="c"><span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC3616" class="line" lang="c"> <span class="k" style="font-weight: 600;">switch</span> <span class="p">(</span><span class="n" style="color: #333;">sigalg</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC3617" class="line" lang="c"> <span class="k" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">GNUTLS_SIGN_RSA_MD5</span><span class="p">:</span></span>
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<p dir="auto">I was thinking something like below, similar to the arrays defined in <code>lib/algorithms/*</code>:</p>
<pre class="code highlight js-syntax-highlight c" lang="c" v-pre="true" style="background-color: #fff; font-family: monospace; font-size: 90%; -premailer-cellpadding: 0; -premailer-cellspacing: 0; -premailer-width: 100%; color: #998; font-style: italic; margin: 0;"><code><span id="LC1" class="line" lang="c"><span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333;">sct_sign_algorithm_st</span> <span class="p">{</span></span>
<span id="LC2" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">uint8_t</span> <span class="n" style="color: #333;">codepoint</span><span class="p">[</span><span class="mi" style="color: #099;">2</span><span class="p">];</span></span>
<span id="LC3" class="line" lang="c"> <span class="n" style="color: #333;">gnutls_sign_algorithm_t</span> <span class="n" style="color: #333;">sign_algo</span><span class="p">;</span></span>
<span id="LC4" class="line" lang="c"> <span class="n" style="color: #333;">gnutls_hash_algorithm_t</span> <span class="n" style="color: #333;">hash_algo</span><span class="p">;</span></span>
<span id="LC5" class="line" lang="c"><span class="p">};</span></span>
<span id="LC6" class="line" lang="c"></span>
<span id="LC7" class="line" lang="c"><span class="k" style="font-weight: 600;">const</span> <span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333;">sct_sign_algorithm_st</span><span class="p">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">{</span></span>
<span id="LC8" class="line" lang="c"> <span class="p">...</span></span>
<span id="LC9" class="line" lang="c"> <span class="p">{</span></span>
<span id="LC10" class="line" lang="c"> <span class="p">.</span><span class="n" style="color: #333;">codepoint</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">{</span> <span class="mh" style="color: #099;">0x05</span><span class="p">,</span> <span class="mh" style="color: #099;">0x01</span> <span class="p">},</span></span>
<span id="LC11" class="line" lang="c"> <span class="p">.</span><span class="n" style="color: #333;">sign_algo</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">GNUTLS_SIGN_RSA_SHA384</span><span class="p">,</span></span>
<span id="LC12" class="line" lang="c"> <span class="p">.</span><span class="n" style="color: #333;">hash_algo</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">GNUTLS_DIG_SHA384</span><span class="p">,</span></span>
<span id="LC13" class="line" lang="c"> <span class="p">},</span></span>
<span id="LC14" class="line" lang="c"> <span class="p">...</span></span>
<span id="LC15" class="line" lang="c"><span class="p">};</span></span></code></pre>
<p dir="auto">It would be slower than the accessing 2-dimensional matrix, as it requires searching on the array, but given the fact that there is only 18 (= 6 * 3) elements, that wouldn't affect performance much.</p>
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