Fix to_bytes

Author: Takahiro-Yoko

modules/exploits/linux/http/empire_skywalker.rb

@@ -270,7 +270,7 @@ def exploit
       #   len(bin(self.sharedSecret)) - 2 // 8 + 1, byteorder="big"
       # )
       # 2(0b) + 1(- 2 // 8 + 1) = 3
-      _sharedSecret = to_bytes(sharedSecret, sharedSecret.to_s(2).length + 3, byteorder="big")
+      _sharedSecret = to_bytes(sharedSecret, sharedSecret.to_s(2).length + 3, little_endian=false)
       sha = OpenSSL::Digest.new('sha256')
       sha.update(_sharedSecret)
       session_key = sha.digest
@@ -405,12 +405,9 @@ def build_response_packet(tasking_id, packet_data)
     packetType + totalPacket + packetNum + result_id + length + packet_data
   end
 
-  def to_bytes(n, length=1, byteorder='big', signed=false)
-    raise ArgumentError, "byteorder must be either 'little' or 'big'" unless ['little', 'big'].include?(byteorder)
-
-    order = (byteorder == 'little') ? (0...length) : (0...length).to_a.reverse
-
-    bytes_array = order.map { |i| (n >> i*8) & 0xff }
+  def to_bytes(n, length=1, little_endian=false)
+    order = little_endian ? (0...length) : (0...length).to_a.reverse
+    bytes_array = order.map { |i| (n >> i * 8) & 0xff }
     bytes_array.pack('C*')
   end