AES加密解密，Wrong IV length: must be 16

做AES加密解密时，cipher.init(Cipher.ENCRYPT_MODE, secretKey, offset);，此方法报错java.security.InvalidAlgorithmParameterException: Wrong IV length: must be 16，该方法传递的密钥和偏移量只能是16字节吗？有没有修改其默认值的方法？

cryptor = AES.new(self.key, self.mode, b'0000000000000000')