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<a href="https://gitlab.com/dueno">Daiki Ueno</a>
commented on a
<a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/2075#note_3121292078">discussion</a>:
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<blockquote dir="auto" style="font-size: inherit; color: #626168; padding-top: 0.5rem; padding-bottom: 0.5rem; padding-left: 1rem; border-left-style: solid; margin: 0px 0px 0.5rem; border-color: #bfbfc3; border-width: 0 0 0 4px;" align="initial">
<p style="color: inherit; line-height: 1.5; margin: 0;">if we do neither, is the performance hit significant?</p>
</blockquote>
<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">I don't think so; the nettle version provides comparable performance (or even outperforms) the CRYPTOGAMS version:</p>
<div class="gl-relative markdown-code-block js-markdown-code">
<pre data-canonical-lang="console" class="code highlight js-syntax-highlight language-console" v-pre="true" style='display: block; font-size: 14px; color: #3a383f; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0px 0 1rem; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: .25rem; white-space: pre; margin-top: 0px; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="console" style="margin-top: 0px;"><span class="gp" style="margin-top: 0px;">$</span><span class="w"> </span>gnutls-cli <span class="nt">--benchmark-ciphers</span></span>
<span id="LC2" class="line" lang="console"><span class="go" style="margin-top: 0px;">[...]</span></span>
<span id="LC3" class="line" lang="console"><span class="go" style="margin-top: 0px;">Checking MAC algorithms, payload size: 16384</span></span>
<span id="LC4" class="line" lang="console"><span class="go" style="margin-top: 0px;"> SHA1 1.05 GB/sec</span></span>
<span id="LC5" class="line" lang="console"><span class="go" style="margin-top: 0px;"> SHA256 0.46 GB/sec</span></span>
<span id="LC6" class="line" lang="console"><span class="go" style="margin-top: 0px;"> SHA512 0.68 GB/sec</span></span>
<span id="LC7" class="line" lang="console"></span>
<span id="LC8" class="line" lang="console"><span class="gp" style="margin-top: 0px;">$</span><span class="w"> </span><span class="nv">GNUTLS_CPUID_OVERRIDE</span><span class="o">=</span>0x1 gnutls-cli <span class="nt">--benchmark-ciphers</span></span>
<span id="LC9" class="line" lang="console"><span class="go" style="margin-top: 0px;">[...]</span></span>
<span id="LC10" class="line" lang="console"><span class="go" style="margin-top: 0px;">Checking MAC algorithms, payload size: 16384</span></span>
<span id="LC11" class="line" lang="console"><span class="go" style="margin-top: 0px;"> SHA1 2.06 GB/sec</span></span>
<span id="LC12" class="line" lang="console"><span class="go" style="margin-top: 0px;"> SHA256 1.93 GB/sec</span></span>
<span id="LC13" class="line" lang="console"><span class="go" style="margin-top: 0px;"> SHA512 0.58 GB/sec</span></span></code></pre>
<copy-code></copy-code><insert-code-snippet></insert-code-snippet>
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<p dir="auto" style="color: #3a383f; margin: 0px;" align="initial">We may even want to drop the CRYPTOGAMS derived assembly for hashes and macs in 4.0. I've added the topic at <a href="https://gitlab.com/gnutls/gnutls/-/wikis/Planning-for-4.0" style="margin-top: 0px;">https://gitlab.com/gnutls/gnutls/-/wikis/Planning-for-4.0</a>.</p>
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