Update Aes256.py

Added comments

Aes256.py

@@ -2,26 +2,31 @@
 import os
 from Crypto.Cipher import AES
 
-
+#Generating random key of 32 bytes
 key=os.urandom(32)
 print("Key Generated")
 print(key)
+#Initialization vector in AES should be 16 bytes
 IV = 16*'\x00'
+#Mode of encryption CBC
 mode = AES.MODE_CBC
+#Creation of encryptor and decryptor object using above details 
 encryptor=AES.new(key,mode,IV=IV)
 decryptor=AES.new(key,mode,IV=IV)
 
 def encrypt(msg):
     n=len(msg)
+    #Checking for length of msg to be multiple of 16 as it is required in aes encryption
     if n==0:
         return
     elif n%16!=0:
-        msg+=' '*(16-(n%16))
+        msg+=' '*(16-(n%16))        #padding with spaces inorder to make the len of msg to be a multiple of 16 
     cipher=encryptor.encrypt(msg)
     print("Encrypted Text")
     print(cipher)
     print("Checking for decryption")
     text=decryptor.decrypt(cipher);
+    #Checking if decrypted text is padded with spaces,so it has been removed by using orignal length of msg
     length=len(text)
     if(length>n):
         plain_text=text[:n]
@@ -31,4 +36,5 @@ def encrypt(msg):
     print(plain_text)
 
 msg=input('Enter The Message To Be Encrypted\n')
-encrypt(msg)
+#calling encrypt function
+encrypt(msg)