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Welcome to the ctr wiki! #include <stdio.h> #include <stdlib.h> #include <string.h> #include <stdint.h>

unsigned int calculate_master_key(unsigned char* generator) { uint32_t table[0x100]; uint32_t data; uint32_t i, j; uint32_t y; uint8_t x; uint64_t yll; uint32_t yhi;

for(i=0; i<0x100; i++)
{
	data = i;
	for(j=0; j<4; j++)
	{
		if (data & 1)
			data = 0xEDBA6320 ^ (data>>1);
		else
			data = data>>1;

		if (data & 1)
			data = 0xEDBA6320 ^ (data>>1);
		else
			data = data>>1;
	}

	table[i] = data;
}

y = 0xFFFFFFFF;
x = generator[0];
for(i=0; i<4; i++)
{
	x ^= y;
	y = table[x] ^ (y>>8);
	x = generator[1+i*2] ^ y;
	y = table[x] ^ (y>>8);
	x = generator[2+i*2];
}

y ^= 0xAAAA;
y += 0x1657;

yll = y;
yll = (yll+1) * 0xA7C5AC47ULL;
yhi = (yll>>48);
yhi *= 0xFFFFF3CB;
y += (yhi<<5);

return y;

}

int main(int argc, const char* argv[]) { unsigned char generator[9] = {0}; unsigned int servicecode, month, day, masterkey;

if (argc != 4)
{
	printf("usage: <servicecode> <month> <day>\n");
	exit(1);
}

servicecode = strtoul(argv[1], 0, 10);
month = strtoul(argv[2], 0, 10);
day = strtoul(argv[3], 0, 10);

servicecode %= 10000;
month %= 100;
day %= 100;
sprintf((char*)generator, "%02d%02d%04d", month, day, servicecode);

masterkey = calculate_master_key(generator);

printf("Master key is %05d\n", masterkey);
return 0;

}