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Performance hint for openssl

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Dirk Wetter
2025-07-02 17:34:29 +02:00
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@ -210,7 +210,7 @@ The same can be achieved by setting the environment variable <code>WARNINGS</cod
<p><code>--ssl-native</code> Instead of using a mixture of bash sockets and a few openssl s_client connects, testssl.sh uses the latter (almost) only. This is faster but provides less accurate results, especially for the client simulation and for cipher support. For all checks you will see a warning if testssl.sh cannot tell if a particular check cannot be performed. For some checks however you might end up getting false negatives without a warning. Thus it is not recommended to use. It should be only used if you prefer speed over accuracy or you know that your target has sufficient overlap with the protocols and cipher provided by your openssl binary.</p>
<p><code>--openssl &lt;path_to_openssl&gt;</code> testssl.sh tries very hard to find automagically the binary supplied (where the tree of testssl.sh resides, from the directory where testssl.sh has been started from, etc.). If all that doesn't work it falls back to openssl supplied from the OS (<code>$PATH</code>). With this option you can point testssl.sh to your binary of choice and override any internal magic to find the openssl binary. (Environment preset via <code>OPENSSL=&lt;path_to_openssl&gt;</code>).</p>
<p><code>--openssl &lt;path_to_openssl&gt;</code> testssl.sh tries first very hard to find the binary supplied (where the tree of testssl.sh resides, from the directory where testssl.sh has been started from, etc.). If all that doesn't work it falls back to openssl supplied from the OS (<code>$PATH</code>). With this option you can point testssl.sh to your binary of choice and override any internal magic to find the openssl binary. (Environment preset via <code>OPENSSL=&lt;path_to_openssl&gt;</code>). Depending on your test parameters it could be faster to pick the OpenSSL version which has a bigger overlap in terms of ciphers and protocols with the target. Also, when testing a modern server, OpenSSL 3.X is faster than older OpenSSL versions, or on MacOS 18, as opposed to the provided LibreSSL version.</p>
<h3 id="TUNING-OPTIONS">TUNING OPTIONS</h3>