initial commit

源码/source/task-src/get-marshaled.py

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+import marshal
+import dis
+
+code = compile(open('plain.py').read(), "<frozen>", "exec")
+dis.dis(code)
+print(code.co_code, len(code.co_code))
+marshal.dump(code, open("plain.marshal", "wb"))

源码/source/task-src/get-obfuscated.py

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+from Crypto.Cipher import AES
+from Crypto.Util.Padding import pad
+import marshal
+import os
+
+aes_key = os.urandom(17)
+with open('../obfuscator/build/lib.win-amd64-cpython-310/pyhumor_runtime.cp310-win_amd64.pyd', 'rb') as fin:
+    filled = fin.read().replace(b'WAIT_TO_BE_FILLED', aes_key)
+with open('pyhumor_runtime.cp310-win_amd64.pyd', 'wb') as fout:
+    fout.write(filled)
+
+code = compile(open('plain.py').read(), "<frozen>", "exec")
+raw = marshal.dumps(code)
+
+code_len = len(code.co_code)
+encrypt_len = (code_len - 8) - (code_len - 8) % 16
+cipher = AES.new(aes_key[1:], AES.MODE_ECB)
+encrypted = cipher.encrypt(raw[38:38+encrypt_len])
+assert len(encrypted) == encrypt_len
+raw = raw[:38] + encrypted + raw[38+encrypt_len:]
+raw = pad(raw, 16)
+
+cipher = AES.new(aes_key[:16], AES.MODE_ECB)
+encrypted = cipher.encrypt(raw)
+structured = b'PYHUMOR\x00\x00\x03\x0A\x00' + len(encrypted).to_bytes(4, 'little') + encrypted
+
+open("pyhumor.py", "w").write(f'''from pyhumor_runtime import __pyhumor__
+
+__pyhumor__(__name__, __file__, {repr(structured)})
+''')

源码/source/task-src/get-task-pyc.py

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+import py_compile
+
+py_compile.compile('pyhumor.py', 'pyhumor.pyc')

源码/source/task-src/plain.py

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+# flag{9bc74ce3-a56d-467f-eb52-d5f3d8923c6f}
+
+__humor_enter__()
+
+try:
+    from hashlib import sha256
+    from functools import reduce
+
+    flag = input('Enter your flag: ')
+
+    group_1 = [
+        int.from_bytes(flag[1::3].encode(), 'big') % 998244353 == 156881262,
+        sha256(flag[-16:].encode()).hexdigest().endswith('dcf56476457880bf5b39b295416f267b7a636324baeae1fd'),
+        reduce(lambda x, y: x ^ y, map(ord, flag)) == 2,
+    ]
+
+    if not all(group_1):
+        print('Wrong')
+        exit(1)
+
+    acc = 0
+    for i in flag:
+        i = ord(i) ^ 0x55
+        acc |= i
+        acc <<= (7 if i & 1 else 8)
+
+    if acc == 27473331342481820165679397757145329260017933200691317902624657196062576436414763023083043884214272:
+        print('Right')
+    else:
+        print('Wrong')
+        exit(1)
+
+except:
+    print('Stop reverse engineering me, enjoy your day :)')
+    exit(1)