 keys or the private keys of the two <b>EVP_PKEY</b>s, depending on what they both contain.</p>

</li>
</ol>

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

<p>The function EVP_PKEY_missing_parameters() returns 1 if the public key parameters of <b>pkey</b> are missing and 0 if they are present or the algorithm doesn&#39;t use parameters.</p>

<p>These functions EVP_PKEY_copy_parameters() returns 1 for success and 0 for failure.</p>

<p>The functions EVP_PKEY_cmp_parameters(), EVP_PKEY_parameters_eq(), EVP_PKEY_