code: private static boolean containsBase64Byte(byte[] arrayOctet) {
          for (int i = 0; i < arrayOctet.length; i++) {
              if (isBase64(arrayOctet[i])) {
                  return true;
              }
          }
          return false;
      }
docs: Tests a given byte array to see if it contains only valid characters within the Base64 alphabet.
  
  @param arrayOctet
  byte array to test
  @return <code>true</code> if any byte is a valid character in the Base64 alphabet; false herwise