Answers for "java decrypt"

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java encrypt and decrypt object

private static Cipher ecipher;
	private static Cipher dcipher;

	private static SecretKey key;

	public static void main(String[] args) {

		try {

			// generate secret key using DES algorithm
			key = KeyGenerator.getInstance("DES").generateKey();

			ecipher = Cipher.getInstance("DES");
			dcipher = Cipher.getInstance("DES");

			// initialize the ciphers with the given key

  ecipher.init(Cipher.ENCRYPT_MODE, key);

  dcipher.init(Cipher.DECRYPT_MODE, key);

  // create a sealed object

  SealedObject sealed = new SealedObject(new SecretObject("My secret message"), ecipher);

  // get the algorithm with the object has been sealed

  String algorithm = sealed.getAlgorithm();

  System.out.println("Algorithm " + algorithm);

  // unseal (decrypt) the object

  SecretObject o = (SecretObject) sealed.getObject(dcipher);

  System.out.println("Original Object: " + o);

		}
		catch (NoSuchAlgorithmException e) {
			System.out.println("No Such Algorithm:" + e.getMessage());
			return;
		}
		catch (NoSuchPaddingException e) {
			System.out.println("No Such Padding:" + e.getMessage());
			return;
		}
		catch (BadPaddingException e) {
			System.out.println("Bad Padding:" + e.getMessage());
			return;
		}
		catch (InvalidKeyException e) {
			System.out.println("Invalid Key:" + e.getMessage());
			return;
		}
		catch (IllegalBlockSizeException e) {
			System.out.println("Illegal Block:" + e.getMessage());
			return;
		}
		catch (ClassNotFoundException e) {
			System.out.println("Class Not Found:" + e.getMessage());
			return;
		}
		catch (IOException e) {
			System.out.println("I/O Error:" + e.getMessage());
			return;
		}

	}

	public static class SecretObject implements Serializable {

		private static final long serialVersionUID = -1335351770906357695L;

		private final String message;

		public SecretObject(String message) {
			this.message = message;
		}

		@Override
		public String toString() {
			return "SecretObject [message=" + message + "]";
		}

	}
Posted by: Guest on October-17-2021

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