keyfile_first.cpp

u_char al, cl;
do {
	key[0] = 0x20 + rand() % (0x7F - 0x20);
	al = key[0];
	u_char bl = al; // key[0]
	cl = bl; // key[0]
	DWORD ebx = (DWORD)bl << 4;
	al &= 0xF;
	DWORD ecx = (DWORD)cl >> 4; 
	cl = ecx & 0xF;             
} while (al == cl); // e.g "(0x22), 3(0x33), D(0x44), U(0x55), f(0x66), w(0x77)

key[1] = (key[0] << 4) | ((key[0] >> 4) & 0xF); // e.g. 0x46 >>> 0x64

key[2] = key[0] + key[1];

key[3] = 0;