glacier ctf 25

2025/glacier/rev/c2/rc5_dec.py

@@ -0,0 +1,14 @@
+import struct
+import hashlib
+from Crypto.Cipher import RC5
+
+if __name__ == '__main__':
+    # 1. The Key from your network trace (Packet 4)
+    # Payload: 99 90 9c 9d d5 8c 81 82 91 98 94 95 dd 84 89 9a ...
+
+    KEY = bytes.fromhex("99 90 9c 9d d5 8c 81 82 91 98 94 95 dd 84 89 9a")
+    ITERATIONS = 85454
+    key_bytes = hashlib.pbkdf2_hmac("sha256", KEY, b"", ITERATIONS, dklen=16)
+    
+    print(f"[+] Key: {key_bytes.hex()}")
+