How to build John the Ripper with OpenCL for Nvidia

Nebucatnetzer · March 27, 2024, 9:18pm

Does someone know how to configure John the Ripper with OpenCL for Nvidia?
It looks like the version from nixpkgs is built without support for it and the upstream repo has a shell.nix but only for AMD and Intel.
I’m probably just missing a few packages.

This solution didn’t work Opencl: how to properly configure opengl.extraPackages? (regression?) - #2 by brogos and simply nvidia-offload didn’t work either.

I’m trying to decrypt the password on a proprietary Raspberry Pi SD card because we currently have to pull the plug to restart it and it seemed like a fun exercise :).

github.com

openwall/john/blob/3c2e19c0dbe0bb6172780018b1d5a6097250dad1/shell.nix

# Redistribution and use in source and binary forms, with or without
# modification, are permitted.
#
# There's ABSOLUTELY NO WARRANTY, express or implied.
# -------------------------------------------------------------------------------
# Nix shells are used create development environments which provide the necessary
# tools/dependencies to develop/build software. The environment is typically
# declared in a shell.nix file in the softwares root directory.
#
# To create the nix-shell, run: `nix-shell ./shell.nix`.
#
# This will place you in a development shell with the minimum required dependencies
# to build openwall/john with opencl support.
#
# NOTE: the 'Official OpenCL runtime for Intel CPUs' is unfree software and
# therefore, when invoking this shell, nix will require the $NIXPKGS_ALLOW_UNFREE=1
# environment variable to be set. If you wish to create your shell with free software
# only, then you can remove 'intel-ocl' entry from 'nativeBuildInputs' below. Please
# note however if you are running and intel based system and remove intel-ocl then
# you will not have opencl support when building openwall/john. For the avoidance of

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https://github.com/NixOS/nixpkgs/blob/

deviantsemicolon · March 28, 2024, 12:36am

I’d imagine the only way to do it is to make a package or an overlay or something like that. You can try requesting john the ripper with opencl support as a separate package or something on nixpkgs though.

Nebucatnetzer · March 28, 2024, 6:29am

I received a working solution but I have to test if it works with the version from nixpkgs or just with the one I compiled myself.
Will update this post.

Nebucatnetzer · March 29, 2024, 11:09am

Adding this to the mkShell part in the linked file above worked for me but you then have to compile John yourself.

    LD_LIBRARY_PATH= pkgs.lib.makeLibraryPath [
      pkgs.ocl-icd
    ];