A set of scripts to tinker with firmware images of (not so recent) Huawei devices.
Obtain a zip file, e.g., VNS-L31C432B160.zip, and unzip.
splitupdate extracts several images from the UPDATE.APP file that you can find within the zip.
The tOS and some built-in TAs can be found within the TEEOS.img.
Use splitteeos to obtain these files.
While most of the built-in TAs are regular ELFs, globaltask is not.
globaltask2elf.py uses some heuristics to generate an ELF header for the globaltask binary.
Same story for the TC kernel.
tos2elf.py uses some heuristics to generate an ELF header from the tOS blob.
With globaltaskgencode.py you can extract the private and public key from globaltask.
Given a globaltask ELF file, globaltaskgencode.py generates a C program that you can execute on an AArch32 device/emulator.