refactor use numpy in user_cipher.py

src/nkode_api.py

@@ -1,7 +1,6 @@
 from dataclasses import dataclass, field
 from uuid import UUID, uuid4
 from typing import Dict, List, Tuple
-
 from src.customer import Customer
 from src.models import NKodePolicy, KeypadSize
 from src.user import User
@@ -19,7 +18,7 @@ class NKodeAPI:
     def create_new_customer(self, keypad_size: KeypadSize, nkode_policy: NKodePolicy) -> UUID:
         new_customer = Customer(
             customer_id=uuid4(),
-            customer_cipher=CustomerCipher.create(keypad_size),
+            cipher=CustomerCipher.create(keypad_size),
             users={},
             nkode_policy=nkode_policy
         )
@@ -30,7 +29,7 @@ class NKodeAPI:
         if customer_id not in self.customers.keys():
             raise ValueError(f"Customer with ID '{customer_id}' does not exist")
         customer = self.customers[customer_id]
-        login_keypad = UserKeypad.create(customer.customer_cipher.keypad_size)
+        login_keypad = UserKeypad.create(customer.cipher.keypad_size)
         set_keypad = login_keypad.sign_up_keypad()
         new_session = UserSignupSession(
             session_id=uuid4(),
@@ -76,15 +75,15 @@ class NKodeAPI:
         customer = self.customers[customer_id]
         passcode = self.signup_sessions[session_id].deduce_passcode(confirm_key_entry)
         new_user_keys = UserCipher.create(
-            customer.customer_cipher.keypad_size,
-            customer.customer_cipher.set_key,
+            customer.cipher.keypad_size,
+            customer.cipher.set_key,
             customer.nkode_policy.max_nkode_len
         )
-        enciphered_passcode = new_user_keys.encipher_nkode(passcode, customer.customer_cipher)
+        enciphered_passcode = new_user_keys.encipher_nkode(passcode, customer.cipher)
         new_user = User(
             username=username,
             enciphered_passcode=enciphered_passcode,
-            user_keys=new_user_keys,
+            cipher=new_user_keys,
             user_keypad=self.signup_sessions[session_id].login_keypad,
         )
         self.customers[customer_id].add_new_user(new_user)