### Question:
Box { public byte[] encrypt(byte[] nonce, byte[] message) { checkLength(nonce, NONCE_BYTES); byte[] msg = prependZeros(ZERO_BYTES, message); byte[] ct = new byte[msg.length]; isValid(sodium().crypto_box_curve25519xsalsa20poly1305(ct, msg, msg.length, nonce, publicKey, privateKey), "Encryption failed"); return removeZeros(BOXZERO_BYTES, ct); } Box(byte[] publicKey, byte[] privateKey);  Box(PublicKey publicKey, PrivateKey privateKey);  Box(String publicKey, String privateKey, Encoder encoder); byte[] encrypt(byte[] nonce, byte[] message); byte[] encrypt(String nonce, String message, Encoder encoder); byte[] decrypt(byte[] nonce, byte[] ciphertext); byte[] decrypt(String nonce, String ciphertext, Encoder encoder);  }### Answer:
@Test public void testEncryptRawBytes() throws Exception { Box box = new Box(new PublicKey(TestVectors.ALICE_PUBLIC_KEY), new PrivateKey(TestVectors.BOB_PRIVATE_KEY)); byte[] nonce = HEX.decode(TestVectors.BOX_NONCE); byte[] message = HEX.decode(TestVectors.BOX_MESSAGE); byte[] ciphertext = HEX.decode(TestVectors.BOX_CIPHERTEXT); byte[] result = box.encrypt(nonce, message); assertTrue("failed to generate ciphertext", Arrays.equals(result, ciphertext)); }
@Test public void testEncryptHexBytes() throws Exception { Box box = new Box(new PublicKey(TestVectors.ALICE_PUBLIC_KEY), new PrivateKey(TestVectors.BOB_PRIVATE_KEY)); byte[] ciphertext = HEX.decode(TestVectors.BOX_CIPHERTEXT); byte[] result = box.encrypt(TestVectors.BOX_NONCE, TestVectors.BOX_MESSAGE, HEX); assertTrue("failed to generate ciphertext", Arrays.equals(result, ciphertext)); }