zrHkgjs6

1SecretKey swkKeySpec = new SecretKeySpec(KEK, 0, swkKey.length, "AES");///KEK is a 256 bit AES key used for wrapping.
2    cipher = Cipher.getInstance("AESWrap", "SunJCE");
3    cipher.init(Cipher.WRAP_MODE, swkKeySpec);
4
5    byte[] key = keyAttributes.getPrivateKey() ///This returns private key in encoded format which is to be wrapped.
6    KeyFactory factory = KeyFactory.getInstance("RSA"); // throws NoSuchAlgorithmException
7    PrivateKey privateKey  = factory.generatePrivate(new PKCS8EncodedKeySpec(privateKeyBytes));
8    log.debug("key.length: {}", key.length); ///this gives 634.
9    wrappedAppKey = cipher.wrap(privateKey); ///exception thrown at this point`