Add hash-used element
An XMPP protocol can include more than one instance of the <hash/> element, as long as each one has a different value for the 'algo' attribute:
2AfMGH8O7UNPTvUVAM9aK13mpCY=
2XarmwTlNxDAMkvymloX3S5+VbylNrJt/l5QyPa+YoU= ]]>
+ In certain scenarios it makes sense to communicate the hash algorithm that is used prior to the calculation of the hash value.
+]]>
The value of the 'algo' attribute MUST be one of the values from the &ianahashes; maintained by &IANA;, or one of the values defined in the following table.