1 files changed, 71 insertions, 0 deletions
diff --git a/research/bad-bruteforcing/do-crack.py b/research/bad-bruteforcing/do-crack.py
new file mode 100644
index 0000000..2862e38
--- /dev/null
+++ b/research/bad-bruteforcing/do-crack.py
@@ -0,0 +1,71 @@
+import os, sys
+from itertools import product
+from multiprocessing import Pool, cpu_count
+from binascii import unhexlify
+import tqdm
+
+def load_samples(folder):
+    msgs, crcs = [], []
+    for fn in os.listdir(folder):
+        with open(os.path.join(folder,fn),'r') as f:
+            for L in f:
+                if '=' not in L: continue
+                h,c = L.strip().split('=',1)
+                try:
+                    msgs.append(unhexlify(h))
+                    crcs.append(int(c,16))
+                except:
+                    pass
+    return msgs, crcs
+
+def calc_crc8(data, poly, init, xorout, ri, ro):
+    crc = init
+    for b in data:
+        if ri: b = int('{:08b}'.format(b)[::-1],2)
+        crc ^= b
+        for _ in range(8):
+            crc = ((crc << 1) ^ poly) & 0xFF if crc & 0x80 else (crc << 1) & 0xFF
+    if ro: crc = int('{:08b}'.format(crc)[::-1],2)
+    return crc ^ xorout
+
+def test_config(args):
+    poly, init, xorout, ri, ro, msgs, crcs = args
+    ok = 0
+    total = len(msgs)
+    for d, chk in zip(msgs, crcs):
+        if calc_crc8(d, poly, init, xorout, ri, ro) == chk:
+            ok += 1
+    return (poly, init, xorout, ri, ro, ok, total)
+
+def main(folder):
+    msgs, crcs = load_samples(folder)
+    if len(msgs) < 2:
+        sys.exit("Need at least 2 samples")
+    tasks = [
+        (poly, init, xorout, ri, ro, msgs, crcs)
+        for poly in range(256) if (poly & 1 or poly == 1)
+        for init, xorout, ri, ro in product(range(256), range(256), [False, True], [False, True])
+    ]
+
+    print(f"Wasting ressources on {len(tasks):,} configs using {cpu_count()} cores... yea")
+    best = []
+    target = len(msgs)
+    with Pool() as p:
+        for poly, init, xorout, ri, ro, ok, total in tqdm.tqdm(p.imap_unordered(test_config, tasks), total=len(tasks)):
+            if ok == total:
+                print("FOUND FULL FUCKING MATCH ✅", f"poly=0x{poly:02X}", f"init=0x{init:02X}",
+                      f"xorout=0x{xorout:02X}", f"ri={ri}", f"ro={ro}")
+                return
+            # keep top-5 partials
+            best.append((ok, poly, init, xorout, ri, ro))
+            best = sorted(best, reverse=True)[:5]
+
+    print("\n=== TOP PARTIAL MATCHES ===")
+    for ok, poly, init, xorout, ri, ro in best:
+        print(f"{ok}/{total} matches – poly=0x{poly:02X}, init=0x{init:02X}, xorout=0x{xorout:02X}, ri={ri}, ro={ro}")
+    print("👎 No full match found.")
+
+if __name__ == '__main__':
+    if len(sys.argv) != 2:
+        sys.exit(f"Usage: python {sys.argv[0]} <samples_folder>")
+    main(sys.argv[1])