First part of TD9

content/secu_logicielle/td9-hackme/files/level4.py

@@ -0,0 +1,19 @@
+#!/bin/env python3
+import sys
+hextext = "66737a65"
+finaltext = ""
+cleartext = ""
+for i in range(0, len(hextext) - 1, 2):
+    c = '{}{}'.format(hextext[i], hextext[i+1])
+    cleartext += chr(int(c, 16) ^ 0x12)
+cur_size=0
+bits_processed=0
+for i in range(0, len(cleartext) - 1, 4):
+    if (len(cleartext) - 4 * bits_processed) > 4:
+        cur_size = 4
+    else:
+        cur_size = len(cleartext) - 4 * bits_processed
+    for j in range(i+cur_size,i,-1):
+        finaltext += cleartext[j-1]
+    bits_processed+=1
+print('Level 3 text: {}'.format(finaltext))