import binascii
shifter = binascii.a2b_hex("83EC4CA10030400033C48944244853555657BB18344000")
def circular_right_shift(value, shift, bit_length=8):
value = value & ((1 << bit_length) - 1)
shift %= bit_length
right_shifted = value >> shift
wrapped_around = (value << (bit_length - shift)) & ((1 << bit_length) - 1)
return right_shifted | wrapped_around
compare = [
circular_right_shift(j, shifter[i] & 7)
for i, j in enumerate(b"KCTF-2024-CRACK-SUCCESS")
]
buffer = bytearray(
binascii.a2b_hex("6810214000FF15DC3F40006800384000FF15D83F")
+ bytes(compare)
+ binascii.a2b_hex("0068D03F4000FF15D43F400083C414FF15A020400033C0C3")
)
for i in range(66):
buffer[i] ^= buffer[66]
for i in range(66):
buffer[66] ^= buffer[i]
func = binascii.a2b_hex(
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
)
for i in range(697):
buffer[i % 67] ^= func[i]
print(binascii.b2a_hex(buffer).decode())