Driver.java

package project1;

import java.util.Scanner;

public class Driver {
    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        boolean on = true;
        
        while (on) {
            System.out.println("\n\n\nProject\n\n1-Hillcipher\n2-Kasiski Test\n3-Break shift cipher\n4-Exit");
            try {
                int choice = sc.nextInt();
                sc.nextLine();
                switch (choice) {
                    case 1:
                        System.out.println("1-Encrypt\n2-Decrypt\n3-Change key");
                        choice = sc.nextInt();
                        sc.nextLine();
                        switch (choice) {
                            case 1: {
                                System.out.println("1-File\n2-System");
                                choice = sc.nextInt();
                                sc.nextLine();
                                int[][] key_matrix = HillCipher.slice_plain(FileOperatoins.read("Key.txt"), 3);
                                if (choice == 1) {
                                   String encrypted = HillCipher.encrypt(FileOperatoins.read("Hill_plain.txt"), key_matrix);
                                   System.out.println("Encrypted: " + encrypted);
                                   FileOperatoins.write(encrypted, "Hill_cipher.txt");
                                } else {
                                   System.out.print("Plain: ");
                                   String plain = sc.nextLine();
                                   System.out.println(plain);
                                   String encrypted = HillCipher.encrypt(plain, key_matrix);
                                   System.out.print("Encrypted: " + encrypted);
                                   FileOperatoins.write(encrypted, "Hill_cipher.txt");
                                }
                               break;
                            }
                            case 2: {
                                System.out.println("1-File\n2-System");
                                choice = sc.nextInt();
                                sc.nextLine();
                                int[][] key_matrix = HillCipher.slice_plain(FileOperatoins.read("Key.txt"), 3);
                                if (choice == 1) {
                                   String plain = HillCipher.decrypt(FileOperatoins.read("Hill_cipher.txt"), key_matrix);
                                   System.out.println("plain: " + plain);
                                   FileOperatoins.write(plain, "Hill_plain.txt");
                                } else {
                                   System.out.print("Cipher: ");
                                   String cipher = sc.nextLine();
                                   String plain = HillCipher.decrypt(cipher, key_matrix);
                                   System.out.println("Decrypted: " + plain);
                                   FileOperatoins.write(plain, "Hill_plain.txt");
                                }
                               break;
                            }
                            case 3:
                                System.out.print("New Key: ");
                                String new_key = sc.nextLine();
                                if (new_key.length() != 9) {
                                    System.out.println("3*3 Hillcipher key must be of length 9");
                                    break;
                                }
                                FileOperatoins.write(new_key, "Key.txt");
                                break;
                        }
                        break;
                    
                    case 2:
                        String plaintext =
                            "there are two ways of constructing a software design " +
                            "one way is to make it so simple that there are obviously no deficiencies " +
                            "and the other way is to make it so complicated that there are no obvious deficiencies " +
                            "the first method is far more difficult it demands the same skill devotion insight and " +
                            "even inspiration as the discovery of the simple physical laws which underlie the " +
                            "complex phenomena of nature cryptography is the practice and study of techniques " +
                            "for secure communication in the presence of third parties called adversaries " +
                            "more generally cryptography is about constructing and analyzing protocols that " +
                            "prevent third parties or the public from reading private messages";
                
                        String vigKey    = "secret";
                        String ciphertext = VigenereCipher.encrypt(plaintext, vigKey);
                
                        System.out.println("Kasiski Test");
                        System.out.println("Original key : " + vigKey);
                        System.out.println("Ciphertext   : " + ciphertext);
                        System.out.println();
                        String output = KasiskiTest.breakVigenere(ciphertext);
                        System.out.println(output);
                        FileOperatoins.write(output, "Kasiski Result");
                        break;

                    case 3:
                        System.out.print("Cipher to break: ");
                        String cipher = sc.nextLine();
                        System.out.println(ShiftCipherBreaker.breakCipher(cipher));
                        break;

                    case 4:
                        on = false;
                        break;
                }
            } catch (Exception e) {
                System.out.println("Invalid input");
            }
            
        }
    }
}