byte[] expectedEncryptedKey = ByteUtil.convertUnsignedToSignedTwosComp(new int[]{78, 186, 151, 59, 11, 141, 81, 240, 213, 245, 83, 211, 53, 188,
134, 188, 66, 125, 36, 200, 222, 124, 5, 103, 249, 52, 117, 184, 140,
81, 246, 158, 161, 177, 20, 33, 245, 57, 59, 4});
byte[] encryptedKey = contentEncryptionKeys.getEncryptedKey();
String encodedEncryptedKey = base64url.base64UrlEncode(encryptedKey);
assertArrayEquals(expectedEncryptedKey, encryptedKey);
String encodedIv = "Ye9j1qs22DmRSAddIh-VnA";
byte[] iv = base64url.base64UrlDecode(encodedIv);