I have found the source code for the tool aescrypt2_huawei that is provided and a walk-through provided on a blog called TheZedt. It seems the Huawei uses the same configuration encryption key hex:13395537D2730554A176799F6D56A239 on all of its devices and the only thing special about the binary version of the tool is the fact it adds an 8-byte header to the file. You can see the source code link for a more detailed explanation.