Encryption

// Create a new .cpp file .. name it encryption_table
//+ source

#include <iostream>
#include <cstdlib>
using namespace std;
const int NSYMS = 95;
const int NSHUFFLES = 1000;
const int kSTART = 0;
const int kINCREMENT = 1;
static int substitutions[] = {
'U', 'L', 'd', '{', 'p', 'Q', '@', 'M',
'-', ']', 'O', 'r', 'c', '6', '^', '#',
'Y', 'w', 'W', 'v', '!', 'F', 'b', ')',
'+', 'h', 'J', 'f', 'C', '8', 'B', '7',
'.', 'k', '2', 'u', 'Z', '9', 'K', 'o',
'3', 'x', ' ', '\'', '=', '&', 'N', '*',
'1', 'z', '(', '`', 'R', 'P', ':', 'l',
'4', '0', 'e', '$', '_', '}', 'j', 't',
'?', 'S', 'q', '>', ';', 'T', 'y', 'i',
'\\', 'A', 'D', 'V', '5', '|', '<', '/',
'E', 'g', 'm', ',', '[', 'H', '%', 'a',
's', 'n', 'I', 'X', '~', '"', 'G'
};
const int len = sizeof(substitutions) / sizeof(int);
int main()
{
cout << "Enter seed for random number generator" << endl;
int s;
cin >> s;
srand(s);
char table[NSYMS];
for(int i = 0; i < NSYMS; i++)
table[i] = i + ' ';
// shuffle
for(int j = 0; j < NSHUFFLES; j++ ) {
int ndx1 = rand() % NSYMS;
int ndx2 = rand() % NSYMS;
char temp = table[ndx1];
table[ndx1] = table[ndx2];
table[ndx2] = temp;
}
// Output
int j = 0;
for(int i = 0; i < NSYMS; i++) {
cout << "'" << table[i] << "', ";
j++;
if(j == 8) { cout << endl; j = 0; }
}
cout << endl;
return 0;
}


//+ Now create another .cpp file named encrytpion
//+ source

#include <iostream>
#include <cstdlib>
#include <fstream>
#include <string.h>
using namespace std;
const int NSYMS = 95;
const int NSHUFFLES = 1000;
const int kSTART = 0;
const int kINCREMENT = 1;
static int substitutions[] = {
'U', 'L', 'd', '{', 'p', 'Q', '@', 'M',
'-', ']', 'O', 'r', 'c', '6', '^', '#',
'Y', 'w', 'W', 'v', '!', 'F', 'b', ')',
'+', 'h', 'J', 'f', 'C', '8', 'B', '7',
'.', 'k', '2', 'u', 'Z', '9', 'K', 'o',
'3', 'x', ' ', '\'', '=', '&', 'N', '*',
'1', 'z', '(', '`', 'R', 'P', ':', 'l',
'4', '0', 'e', '$', '_', '}', 'j', 't',
'?', 'S', 'q', '>', ';', 'T', 'y', 'i',
'\\', 'A', 'D', 'V', '5', '|', '<', '/',
'E', 'g', 'm', ',', '[', 'H', '%', 'a',
's', 'n', 'I', 'X', '~', '"', 'G'
};
const int len = sizeof(substitutions) / sizeof(int);
const int kMSGSIZE = 200000;
static ofstream outfile;
void OpenOutfile(void);
int GetAndCheckLine(char line[], int linelen);
void GetMessage(char txt[]);
void Encrypt(char m[]);
void SaveToFile(const char m[]);
void CloseFile(void);
void OpenOutfile(void)
{
const int kNAMESIZE = 100;
char filename[kNAMESIZE];
cout <<"\t\t\t:] CODED BY XXLB::OREN [:"<<endl;
cout << "\n\nEnter name of message file : ";
cin.getline(filename, kNAMESIZE-1, '\n');
outfile.open(filename, ios::out);
if(!outfile.good()) {
cout << "Can't open that file. Quitting." << endl;
exit(1);
}
}
int GetAndCheckLine(char line[], int linelen)
{
cin.getline(line, linelen - 1, '\n');
// Check for a line with no characters
int actuallength = strlen(line);
if(actuallength == 0)
return 0;
// Check contents
// all characters should be printable ASCII
for(int i = 0; i< actuallength; i++)
if(!isprint(line[i])) {
cout << "Illegal characters,"
" line discarded"; return -1; }
return actuallength;
}
void GetMessage(char txt[])
{
int count = 0;
txt[count] = '\0';
const int ll = 120;
char Line[ll];
int n = GetAndCheckLine(Line,ll);
while(n != 0) {
if(n > 0) {
count += n;
if(count > kMSGSIZE-2) {
cout << "\n\nSorry that message is"
"too long. Quitting." << endl;
exit(1);
}
strcat(txt, Line);
// add the space to the end of the message
txt[count] =' ';
// update message length
count++;
// and replace the null just overwritten
txt[count] = '\0';
}
n = GetAndCheckLine(Line,ll);
}
}
void Encrypt(char m[])
{
int k = kSTART;
for(int i=0; m[i] != '\0'; i++) {
char ch = m[i];
m[i] = substitutions[(ch-32 +k ) % len];
k += kINCREMENT;
}
}
void SaveToFile(const char m[])
{
outfile << m;
}
void CloseFile(void)
{
outfile.close();
}
int main()
{
char msg[kMSGSIZE];
OpenOutfile();
cout <<"\n\n--------------------------------------------------------------------------------"<<endl;
cout << "Enter text of message:" << endl;
GetMessage(msg);
cout << "Enter seed for encrypting routine generator" << endl;
int s;
cin >> s;
srand(s);
char table[NSYMS];
for(int i = 0; i < NSYMS; i++)
table[i] = i + ' ';
// shuffle
for(int j = 0; j < NSHUFFLES; j++ ) {
int ndx1 = rand() % NSYMS;
int ndx2 = rand() % NSYMS;
char temp = table[ndx1];
table[ndx1] = table[ndx2];
table[ndx2] = temp;
}
// Output
int j = 0;
for(int i = 0; i < NSYMS; i++) {
cout << "'" << table[i] << "', ";
j++;
if(j == 8) { cout << endl; j = 0; }
}
cout <<"\n--------------------------------------------------------------------------------"<<endl;
cout << "\n\nEncrypting and saving." << endl;
Encrypt(msg);
SaveToFile(msg);
CloseFile();
cout <<"\n:] ========== >>>>> DONE <<<<< =========="<<endl;
system("pause");
return 0;
}

//+ compile and run ....