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#include <fstream>
#include <iostream>
using namespace std;
class Encryption
{
protected:
int key;
ifstream inFile;
ofstream outFile;
public:
Encryption(char *inFileName, char *outFileName);
~Encryption();
//Pure virtual funtion
virtual char transform(char ch, int key) = 0;
// virtual char unTransform(char ch, int key) = 0;
// do the encryption work
void encrypt(int key);
void decrypt(int key);
int setEncKey(int key);
};
Encryption::Encryption(char *inFileName, char *outFileName)
{
inFile.open(inFileName);
outFile.open(outFileName);
if(!inFile)
{
cout << "The file " << inFileName << " can not be opened." << endl;
exit(1);
}
if(!outFile)
{
cout << "The file " << outFileName << " can not be opened." << endl;
exit(1);
}
}
/***********************************
| Desructor Closes the files |
\***********************************/
Encryption::~Encryption()
{
inFile.close();
outFile.close();
}
/***********************************
| Set the encryption key for usage |
\**********************************/
int Encryption::setEncKey(int key)
{
this -> key = key;
return key;
}
/***********************************
| Encrypt Function uses the virtual transform |
| member function to transform individual |
| characters. |
\**********************************/
void Encryption::encrypt(int key)
{
char ch;
char transCh;
inFile.get(ch);
while(!inFile.fail())
{
transCh = transform(ch, key);
outFile.put(transCh);
inFile.get(ch);
}
}
/*********************************
| Unencryption, takes chars and subtracts |
| the key from the char to get original value |
\*********************************/
void Encryption::decrypt(int key)
{
char ch;
char transCh;
inFile.get(ch);
while(!inFile.fail())
{
transCh = transform(ch, key);
outFile.put(transCh);
inFile.get(ch);
}
}
//The subclass simply overrides the virtual transformation function
class SimpleEncryption : public Encryption
{
public:
char transform(char ch, int key)
{
return ch + key;
}
SimpleEncryption(char *inFileName, char *outFileName) : Encryption(inFileName, outFileName) { };
};
class simpleDecryption : public Encryption
{
public:
char transform(char ch, int key)
{
return ch - key;
}
simpleDecryption(char *inFileName, char *outFileName) : Encryption(inFileName, outFileName) { };
};
int main()
{
int key = 0;
char inFileName[80], outFileName[80];
cout << "\t\t\t-=[ File Encryption ]=-\n" << endl;
cout << "Enter name of file to encrypt: ";
cin >> inFileName;
cout << "Enter name of file to recieve encrypted text: ";
cin >> outFileName;
cout << "Enter encryption key: ";
cin >> key;
SimpleEncryption obfuscate(inFileName, outFileName);
obfuscate.encrypt(obfuscate.setEncKey(key));
system("cls");
cout << "\t\t\t-=[ Encryption Completed ]=-\n" << endl;
cout << "\t\t\t-=[ File Decryption ]=-\n" << endl;
cout << "Enter name of file for decryption: ";
cin >> inFileName;
cout << "Enter name of file for decrypted output: ";
cin >> outFileName;
key = 0;
cout << "Enter the decryption key: ";
cin >> key;
simpleDecryption unObfuscate(inFileName, outFileName);
unObfuscate.decrypt(unObfuscate.setEncKey(key));
cout << "\t\t\t-=[ Decryption Completed ]=-\n" << endl;
return 0;
}
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