public void decrypting() {
String cipherString;
char cipherChar;
int padInt = 0;
char plainChar;
String newS = "";
while (decrypt.hasNextLine()) {
cipherString = decrypt.nextLine();
for (int i = 0; i < cipherString.length(); i++) {
cipherChar = cipherString.charAt(i);
System.out.print(cipherChar);
try {
padInt = pad.read();
} catch (Exception e) {
System.out.println(e.getMessage());
}
plainChar = (char) ((cipherChar - padInt + 128) % 128);
newS = newS + plainChar;
}
}
System.out.println("");
System.out.println("Output (plaintext): ");
System.out.println(newS);
try {
pad.reset();
} catch (Exception e) {
System.out.println(e.getMessage());
}
}
public void encrypting() {
String plainString;
char plainChar;
int padInt = 0;
char cipherChar;
String newS = "";
// while( encrypt.hasNextLine( ) )
// {
plainString = encrypt.nextLine();
for (int i = 0; i < plainString.length(); i++) {
plainChar = plainString.charAt(i);
System.out.print(plainChar);
try {
padInt = pad.read();
} catch (Exception e) {
System.out.println(e.getMessage());
}
cipherChar = (char) ((plainChar + padInt) % 128);
newS = newS + cipherChar;
}
// }
System.out.println("");
System.out.println("Output (plaintext): ");
System.out.println(newS);
out.print(newS);
out.close();
try {
pad.reset();
} catch (Exception e) {
System.out.println(e.getMessage());
}
}
// -------------------- constructor -------------------------
public CipherApp() {
// Try to open the pad file.
try {
padFile = new FileReader("pad.txt");
pad = new BufferedReader(padFile);
pad.mark(1000);
} catch (Exception e) {
System.out.println(e.getMessage());
}
// Print out the Menu options.
System.out.println("+++++++++++++++++++++++++++++++++++" + "+++++++++++++++++++++++++");
System.out.println(" ACME Cipher Machine " + "Started with pad: pad.txt");
System.out.println("+++++++++++++++++++++++++++++++++++" + "+++++++++++++++++++++++++");
System.out.println("Menu:");
System.out.println(" (e)ncrypt <cipher output file>");
System.out.println(" (d)ecrypt <cipher input file> ");
System.out.println(" (q)uit");
// Make the keyboard an input and continue through the loop while
// the keyboard has a next line.
keyboard = new Scanner(System.in);
while (keyboard.hasNext()) {
menu = keyboard.next();
// If the user chooses quit, exit the loop.
if (menu.equalsIgnoreCase("Quit") || menu.equalsIgnoreCase("q")) {
System.out.println("Goodbye, don't forget " + "to burn the pad file!");
break;
}
// If the user chooses Decrypt, decrypt the file they also input.
else if (menu.equalsIgnoreCase("d") || menu.equalsIgnoreCase("decrypt")) {
System.out.println("++++++++++++++++++++++++++++" + "++++++++++++++");
System.out.println("Decrypting: ");
System.out.println("++++++++++++++++++++++++++++" + "++++++++++++++");
file = keyboard.next().trim();
System.out.println("Input file (ciphertext): " + file + "\n");
read = new File(file);
try {
decrypt = new Scanner(read);
decrypting();
} catch (Exception e) {
System.out.println("Catch: " + e.getMessage());
}
}
// If the user chooses Encrypt, Encrypt the input and save it to
// a file.
else if (menu.equalsIgnoreCase("e") || menu.equalsIgnoreCase("encrypt")) {
System.out.println("++++++++++++++++++++++++++++" + "++++++++++++++");
System.out.println("Encrypting: ");
System.out.println("++++++++++++++++++++++++++++" + "++++++++++++++");
file = keyboard.next().trim();
System.out.println("Output file (plaintext): " + file + "\n");
System.out.println("Input a message: ");
try {
out = new PrintWriter(file);
encrypt = new Scanner(System.in);
encrypting();
} catch (Exception e) {
System.out.println("Catch: " + e.getMessage());
}
}
System.out.println("+++++++++++++++++++++++++++++++++++" + "+++++++++++++++++++++++++");
System.out.println(" ACME Cipher Machine " + "Started with pad: pad.txt");
System.out.println("+++++++++++++++++++++++++++++++++++" + "+++++++++++++++++++++++++");
System.out.println("Menu:");
System.out.println(" (e)ncrypt <cipher output file>");
System.out.println(" (d)ecrypt <cipher input file> ");
System.out.println(" (q)uit");
}
}