ructf 2011 quals

ructf2011/rev200/README

@@ -0,0 +1,5 @@
+key.hex is AVR AtMega64 (or 128) code
+
+1. look at key.txt at end
+2. look at key.bin in hex after substring "key:"
+3. look into key.idb to calls to CreateChar function

ructf2011/rev200/bin2font.rb

@@ -0,0 +1,12 @@
+#!/usr/bin/ruby
+data = File.read('key.bin')
+i=1
+data.each_byte do |b|
+  s = "%08b" % b
+  puts s.tr('01','.#')
+  if i==8
+    #puts
+    i=0
+  end
+  i+=1
+end

ructf2011/rev200/fc.rb

@@ -0,0 +1,28 @@
+#!/usr/bin/ruby
+# simple binary file compare (c) http://zed.0xff.me
+# like good old DOS "fc /b"
+
+if ARGV.size < 2
+  puts("[!] gimme at least two filenames")
+  exit
+end
+
+handles = ARGV.map{ |fname| open(fname) }
+
+while !handles.any?(&:eof)
+  bytes = handles.map(&:readbyte)
+  if bytes.uniq.size > 1
+    @diff = true
+    printf "%08x:"+" %02x"*handles.size+"\n", handles[0].pos-1, *bytes
+  end
+end
+
+unless handles.all?(&:eof)
+  @diff = true
+  puts
+  ARGV.each do |fname|
+    printf "[!] %20s is %8d bytes long\n", fname, File.size(fname)
+  end
+end
+
+puts "[.] all files are identical" unless @diff

ructf2011/rev200/hex2bin.rb

@@ -0,0 +1,17 @@
+#!/usr/bin/ruby
+data = File.read(ARGV.first)
+a = ''
+data.strip.split("\n").each do |l|
+  l.strip!
+  if l =~ /^:100/
+  else
+    $stderr.puts "[?] #{l}"
+    next
+  end
+  l.sub! /^:100...../,''
+  l = l[0..-3]
+  (0..15).each do |i|
+    a << l[i*2,2].to_i(16).chr
+  end
+end
+$stdout << a

ructf2011/rev200/key.hex

@@ -0,0 +1,159 @@
+:100000000C9462000C941D040C944A040C948A0015
+:100010000C948A000C948A000C948A000C948A0038
+:100020000C948A000C948A000C948A000C948A0028
+:100030000C948A000C948A000C948A000C948A0018
+:100040000C9403030C948A000C948A000C948A008C
+:100050000C948A000C948A000C948A000C948A00F8
+:100060000C948A000C948A000000000024002700F1
+:100070002A0000000000250028002B0000000000DE
+:1000800023002600290004040404040404040202DA
+:100090000202020203030303030301020408102007
+:1000A0004080010204081020010204081020000012
+:1000B0000007000201000003040600000000000029
+:1000C0000000A40211241FBECFEFD8E0DEBFCDBFD9
+:1000D00011E0A0E0B1E0E2E8F9E002C005900D9285
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