Add rsaBackend with basic functions

.gitignore

@@ -2,3 +2,4 @@ build/
 a.out
 rsa.so
 privkey.json
+__pycache__

rsaBackend.py

@@ -0,0 +1,36 @@
+#!/usr/bin/env python3
+import rsa
+import json
+import os
+import sys
+
+def createKey():
+    try:
+        f = open("privkey.json", "w")
+        tuple = rsa.generateKey()
+        key = {"n": tuple[0].decode(), "e": tuple[1].decode(), "d": tuple[2].decode()}
+        f.write(json.dumps(key))
+    except:
+        print("An error occured during the key generation")
+        sys.exit()
+    finally:
+        f.close()
+    return key
+
+def loadKey():
+    try:
+        f = open("privkey.json", "r")
+        key = json.load(f)
+    except:
+        print("An error occured during the key loading, resetting private key")
+        key = createKey()
+    finally:
+        f.close()
+    return key
+
+def getKey():
+    if os.path.isfile("privkey.json"):
+        key = loadKey()
+    else:
+        key = createkey()
+    return key

test.py

@@ -3,18 +3,9 @@
 import time
 import binascii
 import json
+import rsaBackend
 
-try:
-    f = open("privkey.json")
-    key = json.load(f)
-    f.close()
-except FileNotFoundError:
-    f = open("privkey.json", "w")
-    tuple = rsa.generateKey()
-    key = {"n": tuple[0].decode(), "e": tuple[1].decode(), "d": tuple[2].decode()}
-    print(key)
-    f.write(json.dumps(key))
-    f.close()
+key = rsaBackend.getKey()
 
 input = input("What do you want to encrypt? ")
 input = binascii.hexlify(input.encode()).decode()