AES sample code

gistfile1.java

public class AesTest {
	@Test
	public void stringCanBeEncripted() throws NoSuchAlgorithmException, NoSuchProviderException,
			NoSuchPaddingException, InvalidKeyException, ShortBufferException, IllegalBlockSizeException, BadPaddingException {
		String original = "Kiwiple Inc.";
		AesToy aes = new AesToy();
		
		String encrypted = aes.encrypt(original);
		System.out.println("encrypted: " + encrypted);
		String decrypted = aes.decrypt(encrypted);
		
		assertEquals(decrypted, original);
		
	}
}

public class AesToy {

	private SecretKeySpec key;
	private Cipher cipher;

	public AesToy() throws NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException {
		Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
		byte[] keyBytes = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c,
				0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17 };
		key = new SecretKeySpec(keyBytes, "AES");
		cipher = Cipher.getInstance("AES/ECB/PKCS7Padding", "BC");

	}

	public String encrypt(String original) throws ShortBufferException, IllegalBlockSizeException, BadPaddingException,
			InvalidKeyException {
		byte[] orig = original.getBytes();
		cipher.init(Cipher.ENCRYPT_MODE, key);

		byte[] cipherText = new byte[cipher.getOutputSize(orig.length)];
		int ctLength = cipher.update(orig, 0, orig.length, cipherText, 0);
		ctLength += cipher.doFinal(cipherText, ctLength);
		String encoded;
		try {
			encoded = encode(Arrays.copyOfRange(cipherText, 0, ctLength));
		} catch (UnsupportedEncodingException e) {
			encoded = "";
		}
		return encoded;
	}

	public String decrypt(String encryptedString) throws ShortBufferException, InvalidKeyException,
			IllegalBlockSizeException, BadPaddingException {
		cipher.init(Cipher.DECRYPT_MODE, key);
		byte[] encrypted = decode(encryptedString);
		byte[] plainText = new byte[cipher.getOutputSize(encrypted.length)];
		int ptLength = cipher.update(encrypted, 0, encrypted.length, plainText, 0);
		ptLength += cipher.doFinal(plainText, ptLength);
		return new String(Arrays.copyOfRange(plainText, 0, ptLength));
	}

	private String encode(byte[] bytes) throws UnsupportedEncodingException {
		byte[] encoded = Base64.encodeBase64(bytes);
		return new String(encoded);
	}

	private byte[] decode(String str) {
		byte[] encoded = str.getBytes();
		return Base64.decodeBase64(encoded);
	}

}

Bouncy Castle Crypto API http://www.bouncycastle.org/latest_releases.html
commons codec http://commons.apache.org/codec/