A simple DES algorithm is not difficult, there are notes, written using VS2010.

DES\Debug\DES10.0.exe
...\.....\DES10.0.ilk
...\.....\DES10.0.pdb
...\.ES10.0\1.txt
...\.......\2.txt
...\.......\3.txt
...\.......\Debug\CL.read.1.tlog
...\.......\.....\CL.write.1.tlog
...\.......\.....\DES10.0.exe.embed.manifest
...\.......\.....\DES10.0.exe.embed.manifest.res
...\.......\.....\DES10.0.exe.intermediate.manifest
...\.......\.....\DES10.0.lastbuildstate
...\.......\.....\DES10.0.log
...\.......\.....\DES10.0.obj
...\.......\.....\DES10.0.pch
...\.......\.....\DES10.0_manifest.rc
...\.......\.....\link-cvtres.read.1.tlog
...\.......\.....\link-cvtres.write.1.tlog
...\.......\.....\link.read.1.tlog
...\.......\.....\link.write.1.tlog
...\.......\.....\mt.read.1.tlog
...\.......\.....\mt.write.1.tlog
...\.......\.....\rc.read.1.tlog
...\.......\.....\rc.write.1.tlog
...\.......\.....\stdafx.obj
...\.......\.....\vc100.idb
...\.......\.....\vc100.pdb
...\.......\DES10.0.cpp
...\.......\DES10.0.vcxproj
...\.......\DES10.0.vcxproj.filters
...\.......\DES10.0.vcxproj.user
...\.......\key.txt
...\.......\ReadMe.txt
...\.......\..lease\CL.read.1.tlog
...\.......\.......\CL.write.1.tlog
...\.......\.......\DES10.0.exe.intermediate.manifest
...\.......\.......\DES10.0.lastbuildstate
...\.......\.......\DES10.0.log
...\.......\.......\DES10.0.obj
...\.......\.......\DES10.0.pch
...\.......\.......\link.read.1.tlog
...\.......\.......\link.write.1.tlog
...\.......\.......\mt.read.1.tlog
...\.......\.......\mt.write.1.tlog
...\.......\.......\stdafx.obj
...\.......\.......\vc100.pdb
...\.......\stdafx.cpp
...\.......\stdafx.h
...\.......\targetver.h
...\DES10.0.sdf
...\DES10.0.sln
...\DES10.0.suo
...\ipch\des10.0-9107d1f0\des10.ipch
...\Debug\新建文件夹
...\.ES10.0\Debug
...\.......\Release
...\ipch\des10.0-9107d1f0
...\Debug
...\DES10.0
...\ipch
DES

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