et_default_digest_name.html">EVP_PKEY_get_default_digest_name(3)</a> ignores the response to this parameter.</p>

<p>If the keymgmt implementation fills in the value <code>&quot;&quot;</code> or <code>&quot;UNDEF&quot;</code>, <a href="../man3/EVP_PKEY_get_default_digest_name.html">EVP_PKEY_get_default_digest_name(3)</a> will place the string <code>&quot;UNDEF&quot;</code> into its argument <i>mdname</i>. This signifies that no digest has to be specified with the corresponding signature operation, but may b