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Open Source Software protection system - Part 1

, 18 Apr 2004
Outlines in developing an open source implementation of a new software protection system.
encryptrelease_demo.zip
Encrypt.exe
hashlibproper.dll
SysInfo.dll
encrypt_src.zip
Encrypt.dsp
Encrypt.dsw
HashLibProper.dll
HashLibProper.lib
SysInfo.dll
// _THE BlowFishEnc ENCRYPTION ALGORITHM_
// by Bruce Schneier
// Revised code--3/20/94
// Converted to C++ class 5/96, Jim Conger
// Updated to support FileEncryption Utility by Nir Dremer, 9/02
#pragma once

#include "Encryption_i.h"

class BlowFishEnc : public EncryptionInterface
{
public:
	BlowFishEnc(const char *pwd);
	~BlowFishEnc();

	DWORD encryptStream(const char *plain, const DWORD size, char *cipher);
	DWORD decryptStream(const char *cipher, const DWORD size, char *plain);

private:
	DWORD	GetOutputLength(DWORD lInputLong);

	DWORD 	*PArray;
	DWORD	(*SBoxes)[256];
	void 	BlowFishEnc_encipher(DWORD *xl, DWORD *xr);
	void 	BlowFishEnc_decipher(DWORD *xl, DWORD *xr);
};

union aword {
	DWORD dword;
	BYTE byte [4];
	struct {
	unsigned int byte3:8;
	unsigned int byte2:8;
	unsigned int byte1:8;
	unsigned int byte0:8;
	} w;
};

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About the Author

Kamal Shankar
Web Developer
United States United States
Kamal Shankar is a programming freak (or so he feels).He currently lives in the Salt Lake City and loves doing what he has been since 1990 - coding horribly Wink | ;)

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