initial build

services/checksum.py

@@ -0,0 +1,19 @@
+import random
+
+class IdChecksum:
+    @staticmethod
+    def generate():
+        while True:
+            init_num = random.randint(1, 9) 
+            id = [random.randint(0, 9) for _ in range(9)]
+            id.insert(0, init_num)
+            if IdChecksum.is_valid(id):
+                return "".join(str(x) for x in id)
+
+    @staticmethod
+    def is_valid(checksum):
+        sum_digits = sum(checksum[:-1])
+        if sum_digits % 10 == checksum[-1]:
+            return True
+        else:
+            return False

services/encryption.py

@@ -0,0 +1,25 @@
+class Encryption:
+    @staticmethod
+    def vigenere(text: str, key: str, encrypt=True):
+        result = ''
+
+        for i in range(len(text)):
+            letter_n = ord(text[i])
+            key_n = ord(key[i % len(key)])
+
+            if encrypt:
+                value = (letter_n + key_n) % 1114112
+            else:
+                value = (letter_n - key_n) % 1114112
+
+            result += chr(value)
+
+        return result
+
+    @staticmethod
+    def encrypt(text: str, key: str):
+        return Encryption.vigenere(text=text, key=key, encrypt=True)
+
+    @staticmethod
+    def decrypt(text: str, key: str):
+        return Encryption.vigenere(text=text, key=key, encrypt=False)