added aes encryption

ciphers/aesEncryptDecrypt.py

@@ -0,0 +1,35 @@
+from Crypto.Cipher import AES
+import base64
+import hashlib
+
+class EasyAES(object):
+
+	def __init__(self, key, iv):
+		self.__init(key, 128, iv)
+
+	def __init__(self, key, bit, iv):
+		self.__init(key, bit, iv)
+
+	def __init(self, key, bit, iv):
+		if(bit == 256):
+			self.key = hashlib.sha256(key.encode('utf-8')).digest()
+		else:
+			self.key = hashlib.md5(key.encode('utf-8')).digest()
+		self.iv  = hashlib.md5(iv.encode('utf-8')).digest()
+
+		self.mode = AES.MODE_CBC
+		self.bs   = AES.block_size
+
+    #padding
+    self.pad   = lambda s: s + (self.bs - len(s) % self.bs) * chr(self.bs - len(s) % self.bs)
+		self.unpad = lambda s: s[:-ord(s[len(s) - 1:])]
+
+	def encrypt(self, text):
+		cryptor = AES.new(self.key, self.mode, self.iv)
+		ciphertext = cryptor.encrypt(self.pad(text).encode('utf-8'))
+		return base64.b64encode(ciphertext).decode()
+
+	def decrypt(self, text):
+		text = base64.b64decode(text)
+		cryptor = AES.new(self.key, self.mode, self.iv)
+		return self.unpad(cryptor.decrypt(text)).decode()