Merge pull request #518 from NLP-cabbage/lab8

[LAB8] 313551136

Author: YingMuo

lab8/solve.py

@@ -1,11 +1,42 @@
 #!/usr/bin/env python3
-
-import angr,sys
+import sys
 
 def main():
-    secret_key = b""
-    sys.stdout.buffer.write(secret_key)
+    sol = None
+
+    for b3 in range(91, 127):
+        b2 = 200 - b3
+        b1 = 2 * b3 - 150
+        if not (0x20 <= b1 <= 0x7e):
+            continue
+        b0 = b1 ^ 0x55
+        if not (0x20 <= b0 <= 0x7e):
+            continue
+
+        for b4 in range(0x20, 43):
+            b5 = 3 * b4
+            if not (0x20 <= b5 <= 0x7e):
+                continue
+
+            b6 = b5 ^ 0x2A
+            b7 = b6 - 1
+            if not (0x20 <= b6 <= 0x7e and 0x20 <= b7 <= 0x7e):
+                continue
+
+            if not (b2 + b3 == 200): continue
+            if not (b1 + b2 - b3 == 50): continue
+            if not (b6 - b7 == 1): continue
+
+            sol = [b0, b1, b2, b3, b4, b5, b6, b7]
+            break
+        if sol is not None:
+            break
+
+    if sol is None:
+        sys.exit(1)
 
+    data = bytes(sol)
+    sys.stdout.buffer.write(data)
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     main()