_length : <span><a href="../Types/Session/index.html#type-t">Types.Session.t</a> Ctypes_static.ptr</span> <span>&#45;&gt;</span> Unsigned.size_t</code></dt><dd><p><code>encrypt_random_length sess</code></p><p>The number of random bytes needed to encrypt the next message.</p></dd></dl><dl><dt class="spec value" id="val-encrypt_message_length"><a href="#val-encrypt_message_length" class="anchor"></a><code><span class="keyword">val</span> encrypt_message_length : <span><a href="../Types/Session/index.html#type