 the <i>selector</i>. A combination of several selector bits must consider all those subsets, not just one. An implementation is, however, free to consider an empty subset of data to still be a valid subset. For algorithms where some selection is not meaningful such as <b>OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS</b> for RSA keys the function should just return 1 as the selected subset is not really missing in the key.</p>

<p>OSSL_FUNC_keymgmt_validate() should check if the <i>keydata</i> contains valid data s