add backward compatibility for hash responses

Author: Brent Cook

lib/rex/post/meterpreter/extensions/stdapi/fs/file.rb

@@ -152,7 +152,10 @@ def File.md5(path)
 
     response = client.send_request(request)
 
-    return response.get_tlv_value(TLV_TYPE_FILE_HASH)
+    # older meterpreter binaries will send FILE_NAME containing the hash
+    hash = response.get_tlv_value(TLV_TYPE_FILE_HASH) ||
+      response.get_tlv_value(TLV_TYPE_FILE_NAME)
+    return hash
   end
 
   #
@@ -165,7 +168,10 @@ def File.sha1(path)
 
     response = client.send_request(request)
 
-    return response.get_tlv_value(TLV_TYPE_FILE_HASH)
+    # older meterpreter binaries will send FILE_NAME containing the hash
+    hash = response.get_tlv_value(TLV_TYPE_FILE_HASH) ||
+      response.get_tlv_value(TLV_TYPE_FILE_NAME)
+    return hash
   end
 
   #