make the signal funcs under MessageClient into static methods so they the first arg isn't self

messenger.py

@@ -90,6 +90,7 @@ class MessengerClient:
         self.dh = GENERATE_DH()
         self.certificate = None
 
+    @staticmethod
     def RatchetInitAlice(state, SK, bob_dh_public_key):
         state.DHs = GENERATE_DH()
         state.DHr = bob_dh_public_key
@@ -100,6 +101,7 @@ class MessengerClient:
         state.PN = 0
         state.MKSKIPPED = {}
 
+    @staticmethod
     def RatchetInitBob(state, SK, bob_dh_key_pair):
         state.DHs = bob_dh_key_pair
         state.DHr = None
@@ -111,17 +113,20 @@ class MessengerClient:
         state.PN = 0
         state.MKSKIPPED = {}
 
+    @staticmethod
     def RatchetSendKey(state):
         state.CKs, mk = KDF_CK(state.CKs)
         Ns = state.Ns
         state.Ns += 1
         return Ns, mk
 
+    @staticmethod
     def RatchetEncrypt(state, plaintext, AD):
         Ns, mk = RatchetSendKey(state)
         header = HEADER(state.DHs, state.PN, Ns)
         return header, ENCRYPT(mk, plaintext, CONCAT(AD, header))
 
+    @staticmethod
     def RatchetReceiveKey(state, header):
         mk = TrySkippedMessageKeys(state, header)
         if mk != None:
@@ -134,10 +139,12 @@ class MessengerClient:
         state.Nr += 1
         return mk
 
+    @staticmethod
     def RatchetDecrypt(state, header, ciphertext, AD):
         mk = RatchetReceiveKey(state, header)
         return DECRYPT(mk, ciphertext, CONCAT(AD, header))
 
+    @staticmethod
     def TrySkippedMessageKeys(state, header):
         if (header.dh, header.n) in state.MKSKIPPED:
             mk = state.MKSKIPPED[header.dh, header.n]
@@ -146,6 +153,7 @@ class MessengerClient:
         else:
             return None
 
+    @staticmethod
     def SkipMessageKeys(state, until):
         if state.Nr + MAX_SKIP < until:
             raise Error()
@@ -155,6 +163,7 @@ class MessengerClient:
                 state.MKSKIPPED[state.DHr, state.Nr] = mk
                 state.Nr += 1
 
+    @staticmethod
     def DHRatchet(state, header):
         state.PN = state.Ns
         state.Ns = 0