added default.nix and various ctf examples

examples/local-ecboracle.py

@@ -0,0 +1,28 @@
+import string
+
+from imp.attacks import paddingoracle
+
+from Crypto.Cipher import AES
+from Crypto.Util.Padding import pad
+
+CHARSET = [c.encode() for c in string.printable]
+
+KEY = b'you wont get me!'
+FLAG = b'imbaud{omg_you_catched_me}'
+CIPHER = AES.new(KEY, AES.MODE_ECB)
+
+def encrypt(b: bytes, debug=False) -> bytes:
+    padded = pad(b + FLAG, 16)
+    if debug:
+        print(padded)
+    # print(padded)
+    return CIPHER.encrypt(padded)
+
+def main() -> None:
+    paddingoracle.crack(encrypt, pad, CHARSET, 16, batch_size=50, debug=True)
+
+if __name__ == '__main__':
+    try:
+        main()
+    except (KeyboardInterrupt, EOFError):
+        print('\n[!] Interrupt')