mv CIPHER_WINDOW as global variable

git-svn-id: https://redmine.imt-atlantique.fr/svn/xaal/code/Python/trunk@1332 b32b6428-25c9-4566-ad07-03861ab6144f

xaal-lib/src/xAAL/message.py

@@ -36,6 +36,8 @@ import binascii
 
 logger=logging.getLogger(__name__)
 
+# Time Window in seconds to avoid replay attacks
+CIPHER_WINDOW=60*2
 
 class MessageFactoryParserError(Exception):
     
@@ -52,9 +54,6 @@ class MessageFactory():
     - Apply security layer, Ciphering/De-Ciphering chacha20 poly1305
     - Serialize/Deserialize data in JSON"""
    
-    # Time Window in seconds to avoid replay attacks
-    CIPHER_WINDOW = 60*2
-
     def __init__(self,cipherKey):
         self.setCipherKey(cipherKey)
     
@@ -118,10 +117,10 @@ class MessageFactory():
 
         # Replay attack, window fixed to CIPHER_WINDOW in seconds
         currentTimestamp=buildTimestamp()[0] # test done only on seconds ...
-        if dataRx['timestamp'][0] < (currentTimestamp - self.CIPHER_WINDOW):
+        if dataRx['timestamp'][0] < (currentTimestamp - CIPHER_WINDOW):
             raise MessageFactoryParserError("Potential replay attack, message too old")
 
-        if dataRx['timestamp'][0] > (currentTimestamp + self.CIPHER_WINDOW):
+        if dataRx['timestamp'][0] > (currentTimestamp + CIPHER_WINDOW):
             raise MessageFactoryParserError("Potential replay attack, message too young")
 
         # Payload De-Ciphering