lt</td><td>112-bit long salt</td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>RTP error code</dd></dl>
<dl class="retval"><dt>Return values</dt><dd>
  <table class="retval">
    <tr><td class="paramname">RTP_OK</td><td>On success </td></tr>
    <tr><td class="paramname">RTP_INVALID_VALUE</td><td>If key or salt is invalid </td></tr>
    <tr><td class="paramname">RTP_NOT_SUPPORTED</td><td>If user-managed SRTP was not specified in create_stream() </td></tr>
  </table>
  </dd>
<