rcCrackme.py

# http://crackmes.de/users/macabre/rccrackme/

# NOTE: This keygen finds correct serial, but fails to insert the hyphens '-' in the
#       correct (correct in terms of the crackme) way. It gave me headaches trying 
#       to do this in python, but I think it should be easy to implement it in C.

user = input("Enter username: ")

user *= 9 // len(user) + 1 if len(user) < 10 else 1
print('User: ' + user)

serial = [ord(c) for c in user]

for i in range(len(serial) // 2):
        l = len(serial) - i - 1
        serial[i] = serial[i] ^ serial[l]
        serial[l] = (serial[i+1] | serial[i]) >> 1

print('"Technically" here\'s your serial:')
print(serial)

#serial = ''.join(map(str, serial))
#print('Serial: ' + serial[:5]+'-'+serial[6:15]+'-'+serial[16::])