Arcadyan WE420223-99 image sign tool

This tool helps you converting an OpenWRT image to something that can be uploaded in the Arcadyan WE420223-99 web interface. We need to change things in the TRX header so that the arc_uploadhelper tool on the device accepts the uploaded firmware. This was tested on the KPN Experia WiFi 1.00.15 firmware release.

Steps

The arcadyan/dat.h should contain the private keys for signing. They are not included in this repository. You need to create that file and fill variables like const char DAT_0041d784[0x2c2] with the key material.
Obtain an OpenWRT initramfs image. We need initramfs because the original firmware splits up the flash in A/B, OpenWRT uses a single partition. An initramfs image will still fit the A/B splitted partitioning scheme.

Convert the initramfs to a .trx file. The following script was extracted from the OpenWRT source code:

  #!/bin/bash
  echo -ne "hsqs" > $1.hsqs
  trx_magic=0x746f435d
  ./otrx create $1.trx -M ${trx_magic} -f $1 \
    -a 0x20000 -b 0x420000 -f $1.hsqs -a 1000
  dd if=/dev/zero bs=1024 count=1 >> $1.trx.tail
  echo -ne "HDR0" | dd of=$1.trx.tail bs=1 seek=$((0x10c)) count=4 \
    conv=notrunc 2>/dev/null
  dd if=$1.trx.tail >> $1.trx 2>/dev/null
  rm $1.hsqs $1.trx.tail

The otrx tool is built when building the OpenWRT image.

After creating the TRX, compile this repository. Go to the install directory and run: make -f unix/makefile CPUT= ANSISTD=1 arcadyan
Sign the .trx file with ./arcadyan s initramfs-kernel.bin.trx initramfs-kernel_sign.trx

hberntsen/we420223-99-sign

Arcadyan WE420223-99 image sign tool

Steps