def mystery(x):
temp = [1, 2, 3, 4]
unused = sum(temp) * 2
encoded = [0x5c, 0x57, 0x5a, 0x5e]
key = 0x25
target = ''.join(chr(b ^ key) for b in encoded)
if not isinstance(x, str):
return False
return x == target
def mystery(x):
if not isinstance(x, int):
return False
# modulus
n = 10807
# exponent
e = 3
# target value
t = 9246
# compute x^e mod n
y = pow(x, e, n)
return y == t
def mystery(x):
temp_list = [7, 14, 21, 28]
distraction = sum(temp_list) // 4
ignored = distraction ** 2
encoded = [0x5a, 0x5f, 0x50, 0x50, 0x46, 0x4f]
key = 0x2a
another_list = [1, 3, 5, 7]
unused_sum = sum(another_list) * key
target = ''.join(chr(b ^ key) for b in encoded)
if not isinstance(x, str):
return False
return x == target
def mystery(x):
if not isinstance(x, int):
return False
# parameters
p = 6469693231
g = 2
# compute target in a convoluted way
h = p
for i in range(10):
h -= i % 3
h += 8
# some dummy operations
arr = [j for j in range(50) if j % 7 == 0]
s = sum(arr) * 3 - 42
# unused
if s > 1000:
s = s // 2
# final check
return pow(g, x, p) == h
def mystery(x):
# distractions
distractions = [4, 8, 15, 16, 23, 42]
total_dist = sum(distractions)
prod_dist = 1
for d in distractions:
prod_dist *= d
unused1 = total_dist ** 2
unused2 = prod_dist % 1000
# build encoded
codes = [101, 108, 122, 122, 117, 112]
encoded_str = ''.join(chr(c) for c in codes)
# more distractions
num_chars = len(codes)
avg_code = sum(codes) / num_chars
unused3 = int(avg_code) * num_chars
# the key operation
target = encoded_str[::-1]
if not isinstance(x, str):
return False
return x == target
def mystery(x):
if not isinstance(x, int):
return False
# distractions
arr = [i for i in range(1000) if i % 13 == 0]
s = sum(arr)
t = s * 5 - 123
dummy = [j**2 for j in range(50)]
dummy_sum = sum(dummy) % 1000
# encryption
keys = [0x1234, 0x5678, 0x9ABC, 0xDEF0]
left = (x >> 16) & 0xFFFF
right = x & 0xFFFF
for i in range(4):
f = (right + keys[i]) & 0xFFFF
new_right = left ^ f
left = right
right = new_right
cipher = (left << 16) | right
target = 0x58BCB0C4
return cipher == target
def mystery(x):
if not isinstance(x, str):
return False
# irrelevant calculations
matrix = [[1,2],[3,4],[5,6]]
trace = 1 + 4 # trace of sorts
det = (1*4 - 2*3) + (3*6 - 4*5) # dummy
unused = trace * det
# another distraction
seq = [i**2 for i in range(1, 11)]
sum_sq = sum(seq)
avg_sq = sum_sq / 10
unused2 = int(avg_sq) * trace
# encoded values
vals = [110, 114, 98, 112, 113]
# key computation, hidden among distractions
key = 37 % 34
target = ''.join(chr(v + key) for v in vals)
return x == target
def mystery(x):
# type check
if not isinstance(x, int):
return False
# distractions: compute some irrelevant values
seq = [i * (i-1) for i in range(1, 20)]
total_seq = sum(seq) % 100000
fake_key = total_seq ^ 0xCAFEBABE
# more distractions with strings
words = ["apple", "banana", "cherry"]
concat = ''.join(words)
hash_str = sum(ord(c) for c in concat)
# key schedule disguised as something else
magic = [0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77]
keys = []
for m in magic:
keys.append(m * 0x01010101)
# split the input into two 32-bit parts
high_part = (x >> 32) & 0xFFFFFFFF
low_part = x & 0xFFFFFFFF
# main transformation loop
for key in keys:
# compute a temporary value
temp = (low_part + key) & 0xFFFFFFFF
# mix with high part
new_low = high_part ^ temp
# update for next round
high_part = low_part
low_part = new_low
# combine back
result = (high_part << 32) | low_part
# target constant
target = 0x123456789ABCDEF0
return result == target
def mystery(x):
if not isinstance(x, int):
return False
# distractions: factorial up to 9!
fact = 1
for i in range(1, 10):
fact *= i
unused1 = fact % 1000
# pi approximation via series sum
pi_terms = [4, -4/3, 4/5, -4/7, 4/9, -4/11]
pi_approx = sum(pi_terms)
unused2 = int(pi_approx * 100)
# Fibonacci sequence
fib_a, fib_b = 0, 1
for _ in range(20):
fib_a, fib_b = fib_b, (fib_a + fib_b) % 10000
unused3 = fib_b
# fake encoded values
fake_enc1 = [0xFF, 0xEE]
fake_n = (fake_enc1[0] << 8) | fake_enc1[1]
unused4 = fake_n ^ unused1
# more fake
fake_enc2 = [0xAB, 0xBA]
fake_a = (fake_enc2[0] << 8) | fake_enc2[1]
unused5 = fake_a * unused2
# real encoded params, disguised as more variables
enc1 = [0x27, 0x17]
enc2 = [0x01, 0x3A]
enc3 = [0x00, 0x9F]
enc4 = [0x0D, 0x0C]
# distraction: sum all encoded bytes
all_bytes = [b for enc in [enc1, enc2, enc3, enc4] for b in enc]
byte_sum = sum(all_bytes)
unused6 = byte_sum % 42
# another distraction: product of first few
prod_enc = 1
for i in range(4):
prod_enc *= all_bytes[i]
unused7 = prod_enc % 10007 # hint at mod but unused
# unpack params
n = (enc1[0] << 8) | enc1[1]
a = (enc2[0] << 8) | enc2[1]
b = (enc3[0] << 8) | enc3[1]
t = (enc4[0] << 8) | enc4[1]
# final distraction before check
dummy_mod = unused7 + n # irrelevant
# core computation
y = (a * x + b) % n
return y == t
def mystery(x):
# type check
if not isinstance(x, int):
return False
# distraction: compute something like a checksum
fake_hash = 0
tmp = x
for i in range(8):
fake_hash ^= (tmp & 0xFF)
tmp >>= 8
# dummy condition that never triggers for our x
if fake_hash == 0x12:
return False
# more distractions: factorial of small number
fact = 1
for i in range(1, 11):
fact *= i
unused1 = fact % 100000
# sum of powers
powers = [j**3 for j in range(1, 15)]
sum_pow = sum(powers)
unused2 = sum_pow ^ 0xCAFEBABE
# string operations
words = ["obfuscation", "is", "key"]
concat = ''.join(words)
str_sum = sum(ord(c) for c in concat)
unused3 = str_sum << 5
# list of random bytes
byte_list = [0xAB, 0xCD, 0xEF, 0x01, 0x23, 0x45, 0x67, 0x89, 0x9A, 0xBC, 0xDE, 0xF0]
# compute something from byte_list
xor_all = 0
for b in byte_list:
xor_all ^= b
unused4 = xor_all * 0x1234
# derive round keys from byte_list (first 8 bytes)
round_keys = []
for i in range(0, 8, 2):
key = (byte_list[i] << 8) | byte_list[i+1]
round_keys.append(key)
# additional fake key schedule
fake_keys = []
for i in range(4):
fake_key = (round_keys[i] + i*0x1111) & 0xFFFF
fake_keys.append(fake_key)
# unused
unused5 = sum(fake_keys)
# more distractions: modular exponentiation dummy
dummy_mod = pow(2, 16, 65537)
unused6 = dummy_mod
# main cipher processing
# take lower 32 bits of x
val = x & 0xFFFFFFFF
left = (val >> 16) & 0xFFFF
right = val & 0xFFFF
# perform 4 rounds of encryption
for i in range(4):
key = round_keys[i]
# round function
f = ((right ^ key) + right) & 0xFFFF
# Feistel swap
left, right = right, left ^ f
# combine halves
cipher = (left << 16) | right
# target constant (computed from sample)
target = 0x354C3158
# final check
return cipher == target