convert conditionals to case statements

just a little tidying up by using case statements

modules/post/windows/gather/hashdump.rb

@@ -141,7 +141,8 @@ class MetasploitModule < Msf::Post
 
     revision = vf[0x68, 4].unpack('V')[0]
 
-    if revision == 1
+    case revision
+      when 1
         hash = Digest::MD5.new
         hash.update(vf[0x70, 16] + @sam_qwerty + bootkey + @sam_numeric)
 
@@ -149,20 +150,18 @@ class MetasploitModule < Msf::Post
         rc4.key = hash.digest
         hbootkey  = rc4.update(vf[0x80, 32])
         hbootkey << rc4.final
-      return hbootkey
-    end
-
-    if revision == 2
+        hbootkey
+      when 2
         aes = OpenSSL::Cipher.new('aes-128-cbc')
         aes.key = bootkey
         aes.padding = 0
         aes.decrypt
         aes.iv = vf[0x78, 16]
-      return aes.update(vf[0x88, 16]) # we need only 16 bytes
-    end
-
+        aes.update(vf[0x88, 16]) # we need only 16 bytes
+      else
         raise NotImplementedError, "Unknown hboot_key revision: #{revision}"
     end
+  end
 
   def capture_user_keys
     users = {}
@@ -254,7 +253,8 @@ class MetasploitModule < Msf::Post
   def decrypt_user_hash(rid, hbootkey, enchash, pass, default)
     revision = enchash[2, 2].unpack('v')[0]
 
-    if revision == 1
+    case revision
+      when 1
         if enchash.length < 20
           return default
         end
@@ -265,8 +265,7 @@ class MetasploitModule < Msf::Post
         rc4 = OpenSSL::Cipher.new('rc4')
         rc4.key = md5.digest
         okey = rc4.update(enchash[4, 16])
-
-    elsif revision == 2
+      when 2
         if enchash.length < 40
           return default
         end
@@ -277,11 +276,9 @@ class MetasploitModule < Msf::Post
         aes.decrypt
         aes.iv = enchash[8, 16]
         okey = aes.update(enchash[24, 16]) # we need only 16 bytes
-
       else
         print_error("Unknown user hash revision: #{revision}")
         return default
-
     end
 
     des_k1, des_k2 = rid_to_key(rid)