Dvdes-631 -

The check_key function is where the magic happens.

def rotr(x, n): n %= 64 return (x >> n) | ((x << (64 - n)) & 0xFFFFFFFFFFFFFFFF) dvdes-631

18 07 F6 E5 D4 C3 A2 B1

0xB1A2C3D4E5F60718