Open Source Software protection system - Part 1

#pragma once

#include <windows.h>

class EncryptionInterface
{
public:
	EncryptionInterface(const char *pwd) { strncpy(_encryptionKey, pwd, 99); _encryptionKey[99] = 0; }
	virtual ~EncryptionInterface() { ZeroMemory(_encryptionKey, 100); }
	virtual DWORD encryptStream(const char *plain, const DWORD size, char *cipher) = 0;
	virtual DWORD decryptStream(const char *cipher, const DWORD size, char *plain) = 0;
protected:
    char _encryptionKey[100];	
};