From 0bcd78be9657f35dd27a02c16cb70234b1e44d5b Mon Sep 17 00:00:00 2001
From: n0p <0x90@n0p.cc>
Date: Mon, 27 Oct 2014 19:07:43 +0100
Subject: Reversing challenge 300 from hack.lu 2014.

---
 bin/keyCalculator.py | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
 create mode 100644 bin/keyCalculator.py

(limited to 'bin/keyCalculator.py')

diff --git a/bin/keyCalculator.py b/bin/keyCalculator.py
new file mode 100644
index 0000000..9b96700
--- /dev/null
+++ b/bin/keyCalculator.py
@@ -0,0 +1,16 @@
+import pefile
+
+pe = pefile.PE("JonahHex.exe")
+
+ccCount = 0
+text_section = pe.get_data(pe.sections[0].VirtualAddress, pe.sections[0].Misc_VirtualSize)
+
+for byte in text_section:
+	if byte == '\xCC':
+		ccCount += 1
+	if ccCount % 22 == 0:
+		ccCount *= ccCount + 42
+	ccCount %= 0x100
+
+print "AddressOfEntryPoint: " + hex(pe.OPTIONAL_HEADER.AddressOfEntryPoint)
+print "DES key: " + 8*hex(ccCount)[2:]
\ No newline at end of file
-- 
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