investigative reversing 4

investigative_reversing_4/sol.py

@@ -0,0 +1,26 @@
+#!/home/maxime/.pyvenv/bin/python3
+
+for c in range(5, 0, -1):
+ with open("Item0" + str(c) + "_cp.bmp", 'rb') as f:
+    img = f.read()
+
+    leading_space = 2019
+    flag_size = 10
+    enc_size = flag_size * (8 + 4)
+
+    enc_buffer = img[leading_space:leading_space + enc_size]
+    flag_buffer = [''] * flag_size
+
+    for i in range(flag_size):
+        char = 0
+        enc_offset = i * (8 + 4)
+
+        for j in range(8):
+            char |= (enc_buffer[enc_offset+j] & 1) << j
+
+            flag_buffer[i] = chr(char)
+
+    print(''.join(flag_buffer), end='')
+
+print()
+