2Hero:
You mean that password is deferent by the AES encryption/decryption keys?
No-no. When I said "ecnryption/decryption key" I just meant different roles of the key in apporpriate processes. Sorry for misleading you

by making a simple padding from your password
Actually this "padding" is calcualtion of hash from the password. And it shouldn't be simple to be invulnerable to brute-force attacks. The faster (simpler) hash is calculated, the faster brute-force can be done.