### Question:
Authenticate { static boolean verify(byte[] message, SecretKeySpec key) throws InvalidKeyException, NoSuchAlgorithmException { if (message.length < SIGNATURE_LENGTH) { return false; } final byte[] signed = Arrays.copyOfRange(message, 0, message.length - SIGNATURE_LENGTH); final byte[] verify = Arrays.copyOfRange(message, message.length - SIGNATURE_LENGTH, message.length); final byte[] signature = signature(signed, key); return MessageDigest.isEqual(signature, verify); }   static String ALGORITHM; static int SIGNATURE_LENGTH; }### Answer:
@Test public void testVerify() throws Exception { final byte[] test = Helper.combine(vector.getBytes("message"), vector.getBytes("signature")); final byte[] key = vector.getBytes("key"); assertTrue("signature verifies", Authenticate.verify(test, key)); }