def __innernCBCtripleDES(self, data, key, iv, crypt = 'ENCRYPT'):
            result = b''
            iv1 = iv2 = iv3 = iv
            key1 = key[:8]
            key2 = key[8:16]
            if len(key) == 16:
                key3 = key1
            else:
                key3 = key[16:]
            print(len(data))
            for x in range(0, len(data), 8):
                if crypt == 'ENCRYPT':
                    cipher = DES.new(key1, DES.MODE_CBC, iv1)
                    block = cipher.encrypt(data[x:x+8])
                    iv1 = block
                    cipher = DES.new(key2, DES.MODE_CBC, iv2)
                    block = cipher.decrypt(block)
                    iv2 = block
                    cipher = DES.new(key3, DES.MODE_CBC, iv3)
                    block = cipher.encrypt(block)
                    iv3 = block
                    result += block
                else:
                    cipher = DES.new(key3, DES.MODE_CBC, iv1)
                    block = cipher.decrypt(data[x:x+8])
                    iv1 = block
                    cipher = DES.new(key2, DES.MODE_CBC, iv2)
                    block = cipher.encrypt(block)
                    iv2 = block
                    cipher = DES.new(key1, DES.MODE_CBC, iv3)
                    block = cipher.decrypt(block)
                    iv3 = block
                    result += block
            return result