Encrypt and Decrypt with Streams

Main.java

public static void main(String[] args) throws Exception {

	final Key key = generateSymmetricKey("SecretKey".getBytes());

	// encrypting
	final Cipher cEncrypter = Cipher.getInstance("DESede/ECB/PKCS7Padding");
	cEncrypter.init(Cipher.ENCRYPT_MODE, key);
	final ByteArrayOutputStream bos = new ByteArrayOutputStream();
	try(
		CipherOutputStream encrypterStream = new CipherOutputStream(bos, cEncrypter);
		PrintWriter writer = new PrintWriter(new OutputStreamWriter(encrypterStream))
	){
		writer.println("Encrypted messsage!");
	}

	// decrypting
	final Cipher cDecrypter = Cipher.getInstance("DESede/ECB/PKCS7Padding");
	cDecrypter.init(Cipher.DECRYPT_MODE, key);

	try(
		CipherInputStream decrypterStream = new CipherInputStream(new ByteArrayInputStream(bos.toByteArray()), cDecrypter);
		BufferedReader reader = new BufferedReader(new InputStreamReader(decrypterStream))
	){
		System.out.println(reader.readLine());
	}
}

private static Key generateSymmetricKey(byte[] password) throws Exception {
	final MessageDigest digester = MessageDigest.getInstance("SHA");
	digester.update(password);
	return new SecretKeySpec(Arrays.copyOf(digester.digest(), 24), "DESede");
}