roxor allows you to crack XOR-encrypted passwords.

Back in the PSX days, I used a similar tool to get the passwords (cheats) from some Playstation games. This was quite successful - mainly due to lousy 8-bit keys. I can also remember decrypting subroutines of Libcrypt (Sony's copy protection code) the same way, though the keys were 32 bits long.

First, make sure you have Go installed.

To download and install roxor from source, simply run:

go install github.com/mlafeldt/roxor@latest

This should install the roxor command to $GOPATH/bin/roxor.

(You can find alternative implementations of roxor inside the alt directory.)

usage: roxor <file> <crib>

Simply pass roxor the file with the ciphertext and a crib (sample of known plaintext, e.g. a password you already know). roxor will then attack the cipher and output the file offset, the XOR key, and a decrypted preview for each match.

Note that for the attack to succeed, the crib must be at least two characters long, and the ciphertext must be longer than the crib.

roxor was able to get the passwords for these PSX games:

Colin McRae Rally

$ roxor FRONTEND.EXE openroads
Found text at 0x51ff8 (XOR key 0x13)
  preview: openroads...shoeboxes...silkysmooth.backseat....mo

Need For Speed 3

$ roxor NFS3-Benutzername.bin playtm
Found text at 0x13f4c (XOR key 0x01)
  preview: playtm..xcav8...xcntry..mnbeam..gldfsh..mcityz..se

TOCA - World Touring Cars

$ roxor SLES_025.72 THUMBS
Found text at 0x3d534 (XOR key 0x0f)
  preview: THUMBS..REARFEAR....MADCAB..VANISHING...KERBKRAWL.

roxor is licensed under the terms of the MIT License. See LICENSE file.