#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;
}
}