#define N 32ul
void XTEAdecode(unsigned long* data, unsigned char dataLength) 
{
	unsigned char i=0;
	unsigned long x1;
	unsigned long x2;
	unsigned long sum;
	
	while(i<dataLength)
	{
		sum = DELTA*N; // 32 итерации
		x1=*data;
		x2=*(data+1);

		while(sum != 0)
		{
			x2 -= ((x1<<4 ^ x1>>5) + x1) ^ (sum + *(key+(sum>>11&0x03)));
			sum-=DELTA;
			x1 -= ((x2<<4 ^ x2>>5) + x2) ^ (sum + *(key+(sum&0x03)));
		}
		*(data++)=x1;
		*(data++)=x2;
		i+=2;
	}	
}