DES Cipher

DesCrypto.java

import javax.crypto.*;
import javax.crypto.spec.DESKeySpec;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
import java.util.Arrays;
import java.util.Scanner;

public class DesCrypto {
    public static void main(String[] args) throws
            NoSuchAlgorithmException,
            NoSuchPaddingException,
            InvalidKeyException,
            IllegalBlockSizeException,
            BadPaddingException,
            InvalidKeySpecException {

        // Declare Scanner object
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter the password to encrypt the characters: ");
        String password = sc.nextLine();

        // Create an array of bytes from the password
        byte[] passwordBytes = password.getBytes();

        // Generate DESKeySpec object from the password bytes
        DESKeySpec dks = new DESKeySpec(passwordBytes);

        // Create an object of SecretKeyFactory for "DES" Encryption
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
        // generate the secretKey from the SecretKeyFactory using the DESKeySpec above
        SecretKey sk = keyFactory.generateSecret(dks);

        // Declare an object of the class Cipher for "DES"
        Cipher desCipher = Cipher.getInstance("DES");
        // Setting the object into encryption mode
        desCipher.init(Cipher.ENCRYPT_MODE, sk);

        // Ask user for string of characters
        System.out.println("Enter string of characters: ");
        String userText = sc.nextLine();

        // convert the characters to bytes array
        byte[] userTextByte = userText.getBytes();

        // encrypt the entered text from the byte array above
        byte[] encryptedText = desCipher.doFinal(userTextByte);
        System.out.println(Arrays.toString(encryptedText));

        // initialize the Cipher object to DECRYPT_MODE using the using above SecretKey object
        desCipher.init(Cipher.DECRYPT_MODE, sk);

        // decipher the encrypted text
        byte[] decryptedText = desCipher.doFinal(encryptedText);

        //System.out.println(Arrays.toString(decryptedText));
        System.out.println("Original Text: " + new String(decryptedText));
    }
}