rror() and olm_pk_encryption_last_error() will be &quot;OUTPUT_BUFFER_TOO_SMALL&quot;. Returns the number of bytes written.</p></dd></dl><dl><dt class="spec value" id="val-pk_signing_size"><a href="#val-pk_signing_size" class="anchor"></a><code><span class="keyword">val</span> pk_signing_size : unit <span>&#45;&gt;</span> Unsigned.size_t</code></dt><dd><p><code>pk_signing_size ()</code></p><p>The size of a signing object in bytes</p></dd></dl><dl><dt class="spec value" id="val-pk_signing"><a href="#val-pk_s