Алгоритм шифрования штатной сигнализации kia sorento

unsigned char kia_sorento_algorithmus_encrypt(unsigned char data)
{
    unsigned char temp1 = data & 0x0F;
    unsigned char temp2 = data >> 4;
    unsigned char temp3 = (temp1 << 3) | (temp2 & 0x07);
    unsigned char temp4 = temp3 + temp1;
    unsigned char temp5 = temp4 + (temp2 << 4);
    return temp5;
}