:</p>

<pre><code>int EVP_PKEY_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b);
int EVP_PKEY_cmp(const EVP_PKEY *a, const EVP_PKEY *b);</code></pre>

<h1 id="DESCRIPTION">DESCRIPTION</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>The function EVP_PKEY_copy_parameters() copies the parameters from key <b>from</b> to key <b>to</b>. An error is returned if th