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-SHA2.html">EVP_MD-SHA2(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> structure that contains the implementation of the message digest. See <a href="../man3/EVP_MD_meth_new.html">EVP_MD_meth_new(3)</a> for details of t