ed safe-prime groups, and a class of &quot;FIPS186-type&quot; domain parameters. FIPS186-type domain parameters should only be used for backward compatibility with existing applications that cannot be upgraded to use the approved safe-prime groups.</p>

<p>See <a href="../man7/EVP_PKEY-FFC.html">EVP_PKEY-FFC(7)</a> for more information about FFC keys.</p>

<p>The <b>DH</b> key type uses PKCS#3 format which saves <i>p</i> and <i>g</i>, but not the <i>q</i> value. The <b>DHX</b> key type uses X9.42 format whi