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diff --git a/README.txt b/README.txt new file mode 100644 index 0000000..6017804 --- /dev/null +++ b/README.txt @@ -0,0 +1,26 @@ +Link to a repository with the binaries/solutions for hack.lu 2014: +https://github.com/ctfs/write-ups/tree/master/hack-lu-ctf-2014#readme + + +To build JonahHex VisualStudio 2012 and Python 2.7 with pefile was used. + +Building from the bin\ directory: + +1. cl ..\src\JonahHex.c ..\src\import.c ..\src\des\des.c /c /Od /GS- + link /NODEFAULTLIB /ENTRY:main JonahHex.obj import.obj des.obj user32.lib kernel32.lib msvcrt.lib + +2. Run keyCalculator.py and write the displayed values to ..\src\des_patcher\main.c + +3. cd desCalculator + cl ..\..\src\desCalculator\desCalculator.c ..\..\src\desCalculator\des.c + desCalculator.exe + cd .. + Write the new values to patcher.py (line 24/25). + +4. Check in a debugger/hex editor if the offsets for the jumps, which are going + to be patched, are still correct. If they're not, change the offsets in code. + JonahHex.exe has to be rebuild in that case, or change them via debugger/hex + editor. + Also the offsets have to be adjusted in patcher.py. + +5. Run patcher.py - done.
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