ns of the ephemeral_key and mac arguments. Returns the length of the plaintext on success. Returns olm_error() on failure. If the plaintext buffer is too small then olm_pk_encryption_last_error() will be &quot;OUTPUT_BUFFER_TOO_SMALL&quot;.</p></dd></dl><dl><dt class="spec value" id="val-pk_get_private_key"><a href="#val-pk_get_private_key" class="anchor"></a><code><span class="keyword">val</span> pk_get_private_key : <span><a href="../Types/PkDecryption/index.html#type-t">Types.PkDecryption.t</a> Ctypes_st