Reverse Engineering Asked on August 7, 2021
I have this D-Link firmware and would like to identify checksum type used on it and add it to OpenWrt bin file so I could upgrade firmware to OpenWrt instead default crappy D-Link. I did tried to update it through Realtek bootloader cli but it gave me an error
Booting...
OK
OK
---RealTek(RTL8196E-kld) version v6.0.4e(2013.02.22-18:00+0800) [16bit](380MHz)
P0phymode=01, embedded phy
---Ethernet init Okay!
**TFTP Client Upload, File Name: openwrt-realtek-rtl8196e-AP-fw.bin
-|/-|...|/-
**TFTP Client Upload File Size = 003AA004 Bytes at 80500000
Success!
<RealTek>checksum failed 80500000 00009fa5
Here is what binwal says
$ binwalk DIR-605L_v2.08UIBetaB01.bin
DECIMAL HEXADECIMAL DESCRIPTION
--------------------------------------------------------------------------------
11280 0x2C10 LZMA compressed data, properties: 0x5D, dictionary size: 8388608 bytes, uncompressed size: 2547712 bytes
658466 0xA0C22 Squashfs filesystem, big endian, version 2.0, size: 89101 bytes, 8 inodes, blocksize: 65536 bytes, created: 2017-06-09 02:24:25
748596 0xB6C34 Squashfs filesystem, big endian, version 2.0, size: 2592128 bytes, 512 inodes, blocksize: 65536 bytes, created: 2017-06-09 02:24:40
1- If you own original firmware bin image you could use hex workshop, open it: tools -> generate checksum, keep results. Also you have online websites with specific CRC algorythm, MD5, MDC2, and so on... Keep as much results as you could for next step..
2- Normally checksum bytes should be at the end of the file (EOF) and usually is a CRC32 (4 bytes lenght). So collect all checksums and take a look to results if match ok.
Then you would be able to generate correct checksum with proper algorythm, just in case as the bootloader makes.
Never loose the faith :-)
Answered by numind on August 7, 2021
I have this D-Link firmware and would like to identify checksum type used on it
it is MD5 Checksum: d7ad0f50b2f82d60283a75dc63072a6f
binwalk --verbose DIR-605L_v2.08UIBetaB01.bin
Scan Time: 2018-10-09 13:28:37
Target File: /home/training/Desktop/DIR-605L_v2.08UIBetaB01.bin
MD5 Checksum: d7ad0f50b2f82d60283a75dc63072a6f
Signatures: 386
DECIMAL HEXADECIMAL DESCRIPTION
--------------------------------------------------------------------------------
11280 0x2C10 LZMA compressed data, properties: 0x5D, dictionary size: 8388608 bytes, uncompressed size: 2547712 bytes
658466 0xA0C22 Squashfs filesystem, big endian, version 2.0, size: 89101 bytes, 8 inodes, blocksize: 65536 bytes, created: 2017-06-09 02:24:25
748596 0xB6C34 Squashfs filesystem, big endian, version 2.0, size: 2592128 bytes, 512 inodes, blocksize: 65536 bytes, created: 2017-06-09 02:24:40
Answered by hardyrama on August 7, 2021
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