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<a href="https://gitlab.com/dueno">Daiki Ueno</a>
<a href="https://gitlab.com/gnutls/gnutls/-/issues/1577#note_2256702895">commented</a>:
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<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">perf shows that the most significant part is in the PBKDF2 self-tests (see below), which we run a test with 80000 iterations. Skipping that test alone makes it 50% faster already.</p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">The other costly test is test_dh, though I don't think we can make any optimization for it. The rest (e.g., cipher tests) are fast enough, though there are some redundancies (e.g., testing for multiple modes for AES).</p>
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<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: 0 0 1rem; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; border-radius: .25rem; background-color: inherit; white-space: pre; margin-top: 0; 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: 0;"><span class="go" style="margin-top: 0;">GNUTLS_FORCE_FIPS_MODE=1 GNUTLS_CPUID_OVERRIDE=0x0 NETTLE_FAT_OVERRIDE=none perf record -F 999 -a -g -e cycles --call-graph lbr --user-callchains src/gnutls-cli --list</span></span>
<span id="LC2" class="line" lang="console"><span class="go" style="margin-top: 0;">perf report -G -n --stdio</span></span>
<span id="LC3" class="line" lang="console"><span class="go" style="margin-top: 0;">[...]</span></span>
<span id="LC4" class="line" lang="console"><span class="gp" style="margin-top: 0;"> 62.65% 62.65% 85 gnutls-cli libnettle.so.8.8 ></span></span>
<span id="LC5" class="line" lang="console"><span class="go" style="margin-top: 0;"> | </span></span>
<span id="LC6" class="line" lang="console"><span class="go" style="margin-top: 0;"> |--33.58%--nettle_pbkdf2</span></span>
<span id="LC7" class="line" lang="console"><span class="go" style="margin-top: 0;"> | | </span></span>
<span id="LC8" class="line" lang="console"><span class="go" style="margin-top: 0;"> | |--32.88%--nettle_hmac_digest</span></span>
<span id="LC9" class="line" lang="console"><span class="go" style="margin-top: 0;"> | | | </span></span>
<span id="LC10" class="line" lang="console"><span class="go" style="margin-top: 0;"> | | |--32.12%--nettle_sha256_digest</span></span>
<span id="LC11" class="line" lang="console"><span class="go" style="margin-top: 0;"> | | | 0x7f5b1645a300</span></span>
<span id="LC12" class="line" lang="console"><span class="go" style="margin-top: 0;"> | | | nettle_sha256_compress@plt</span></span>
<span id="LC13" class="line" lang="console"><span class="go" style="margin-top: 0;"> | | | </span></span>
<span id="LC14" class="line" lang="console"><span class="go" style="margin-top: 0;"> | | --0.76%--nettle_sha256_update</span></span>
<span id="LC15" class="line" lang="console"><span class="go" style="margin-top: 0;"> | | _nettle_sha256_compress_n@plt</span></span>
<span id="LC16" class="line" lang="console"><span class="go" style="margin-top: 0;"> | | </span></span>
<span id="LC17" class="line" lang="console"><span class="go" style="margin-top: 0;"> | --0.70%--nettle_sha256_update</span></span>
<span id="LC18" class="line" lang="console"><span class="go" style="margin-top: 0;"> | _nettle_sha256_compress_n@plt</span></span>
<span id="LC19" class="line" lang="console"><span class="go" style="margin-top: 0;"> | </span></span>
<span id="LC20" class="line" lang="console"><span class="go" style="margin-top: 0;"> |--12.73%--check_lib_hmac</span></span>
<span id="LC21" class="line" lang="console"><span class="go" style="margin-top: 0;"> | gnutls_hmac_fast</span></span>
<span id="LC22" class="line" lang="console"><span class="go" style="margin-top: 0;"> | _gnutls_mac_fast</span></span>
<span id="LC23" class="line" lang="console"><span class="go" style="margin-top: 0;"> | wrap_nettle_mac_fast</span></span>
<span id="LC24" class="line" lang="console"><span class="go" style="margin-top: 0;"> | nettle_sha256_update</span></span>
<span id="LC25" class="line" lang="console"><span class="go" style="margin-top: 0;"> | _nettle_sha256_compress_n@plt</span></span>
<span id="LC26" class="line" lang="console"><span class="go" style="margin-top: 0;"> | </span></span>
<span id="LC27" class="line" lang="console"><span class="go" style="margin-top: 0;"> |--7.24%--_gnutls_fips_perform_self_checks2</span></span>
<span id="LC28" class="line" lang="console"><span class="go" style="margin-top: 0;"> | | </span></span>
<span id="LC29" class="line" lang="console"><span class="go" style="margin-top: 0;"> | |--6.48%--test_pbkdf2.constprop.0</span></span></code></pre>
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