Revert "Precalculate some uri strings in case the 1000-round generation fails"

This reverts commit 7161a548f4.

Prepping for a more sane solution that doesn't change the URI sizes and
succeeds without fallingback to a pre-generated list.

lib/msf/core/handler/reverse_https.rb

@@ -61,21 +61,18 @@ module ReverseHttps
 		
 		uri_match
 	end
-
+	
 	#
 	# Create a URI that matches a given checksum
 	#
 	def generate_uri_checksum(sum)
-		urix = nil
-		uri = Rex::Text.rand_text_alphanumeric(3)
-		("a".."z").sort_by {rand}.each do |x|
-			urix = (uri + x) if Rex::Text.checksum8(uri + x)
-			break if urix
+		0.upto(1000) do 
+			uri = Rex::Text.rand_text_alphanumeric(4)
+			return uri if Rex::Text.checksum8(uri) == sum
 		end
-		return urix if urix
 		raise RuntimeError, "Unable to generate a string with checksum #{sum}"
 	end
-
+	
 	#
 	# Initializes the HTTP SSL tunneling handler.
 	#