Encrypted Hilink Uimage Firmware Header [upd] Review

$ hexdump -C E3372_update.img | head -4 00000000 48 49 4c 49 04 00 01 00 a0 0f 00 00 00 00 00 00 |HILI............| 00000010 3c 8c 12 00 00 00 00 00 00 00 00 00 00 00 00 00 |<...............| 00000020 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| 00000030 00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 |................|

Common keys (publicly documented via leaked SDKs):

Contains metadata like magic numbers ( 0x270519560 x 27051956 ), image size, load addresses, and CRC checksums. The Payload: The actual OS kernel or filesystem. encrypted hilink uimage firmware header

HiSilicon-based devices (e.g., Huawei E3372, E5785, B311, B525 routers) use a modified bootloader that expects a uImage header. Over time, manufacturers added encryption for two primary reasons:

00000000 56 19 05 27 8A 3F 12 4C 67 45 23 01 00 80 00 80 V..'.?.LgE#.... 00000010 00 80 00 80 B4 3E 1A 00 02 00 00 00 53 45 43 55 .....>......SECU 00000020 52 45 5F 48 49 4C 49 4E 4B 5F 56 31 00 00 00 00 RE_HILINK_V1.... ... $ hexdump -C E3372_update

Last updated: 2025. Tested on E3372h-153, B310s-927, and AR119.

with open("firmware.bin", "rb") as f: enc_header = f.read(4096) Over time, manufacturers added encryption for two primary

A successful decryption revealed a standard squashfs rootfs and Linux kernel 3.18.

. It is often found in firmware for Huawei HiLink devices (such as E3372 or E8372 modems) and certain wireless modules like the Technical Characteristics Magic Signature: The header is identified by the hex string \x4A\x52\xCA\xDA Underlying Format: It is a modified version of the standard