+## Check that this is a sensible thing to do.
+if [ ! -f $KEYS/keeper/$keeper/meta ]; then
+ echo >&2 "$quis: unknown keeper set \`$keeper'"
+ exit 1
+fi
+if [ ! -d $KEYS/recov/$recov ]; then
+ echo >&2 "$quis: unknown recovery key \`$recov'"
+ exit 1
+fi
+if [ ! -f $KEYS/recov/$recov/$keeper.param ]; then
+ echo >&2 "$quis: recovery key \`$recov' not kept by keeper set \`$keeper'"
+ exit 1
+fi
+