a caller should allocate to safely store a signature (called <i>sig</i> in <a href="../man7/provider-signature.html">provider-signature(7)</a>), the result of asymmetric encryption / decryption (<i>out</i> in <a href="../man7/provider-asym_cipher.html">provider-asym_cipher(7)</a>, a derived secret (<i>secret</i> in <a href="../man7/provider-keyexch.html">provider-keyexch(7)</a>, and similar data).</p>

<p>Providers need to implement this parameter in order to properly support various use cases such as CMS s