lopers should be aware of the negative performance implications of calling these functions multiple times and should consider using <a href="../man3/EVP_MD_fetch.html">EVP_MD_fetch(3)</a> with <a href="../man7/EVP_MD-SHA3.html">EVP_MD-SHA3(7)</a> or <a href="../man7/EVP_MD-SHAKE.html">EVP_MD-SHAKE(7)</a> instead. See <a href="../man7/crypto.html">&quot;Performance&quot; in crypto(7)</a> for further information.</p>

<h1 id="RETURN-VALUES">RETURN VALUES</h1>

<p>These functions return a <b>EVP_MD</b> structu