Check signature on MD5 of serial number (gotten from the

author).  If it fails, return false.



word i;

qword state;



usernamelen = length of username from the textbox

srand(CRC32(username));

state=(rand()<<48) + (rand()<<32) + (rand()<<16) + rand();

for (i=1; i<4096; i++)

{

    op=username[i mod usernamelen]&7;

    switch (op)

    {

        case 0: state += rand(); break;

        case 1: state >>= 1; break;

        case 2: state -= rand(); break;

        case 3: state <<= 1; break;

        case 4: state += (1<<31) ; break;

        case 5: state >>>= 37; break;

        case 6: state <<<= 23; break;

        case 7: state += (1<<63); break;

    }

    state ^=(rand()<<48) + (rand()<<32) + (rand()<<16) + rand();

}



if (serial = state) return true;

else return false;