Nice, it seems they finally merged hashcat and oclHashcat!

Yup but OpenCL is now a requirement. Is OpenCL working on your computer?

Don't know, haven't tested OpenCL before. So it's not just "nix-env -i hashcat && hashcat" anymore?

No you need a working OpenCL installation, meaning you need a .icd file in /etc/OpenCL/vendors.

Right now I think only Nvidia boxes or non-nixos boxes might work: https://github.com/zimbatm/nixpkgs/blob/hashcat-3.0.0/nixos/modules/hardware/video/nvidia.nix#L65 . That's why I was trying to add the intel sdk ^_^

Another thing I tried is adding this to my configuration.nix:

environment.etc."OpenCL/vendors/intel-beignet.icd".source =
    "${pkgs.beignet}/etc/OpenCL/vendors/intel-beignet.icd";

Which gets me past the ERROR: clGetPlatformIDs() : -1001 : CL_UNKNOWN_ERROR but gives me something else instead:

 Device #1: Kernel m00000_a0.4251ce2a.kernel not found in cache! Building may take a while...
ASSERTION FAILED: Fail to compile kernel, may need to increase reserved registers for spilling.
  at file /tmp/nix-build-beignet-1.1.2.drv-0/Beignet-1.1.2-Source/backend/src/backend/gen_program.cpp, function virtual gbe::Kernel* gbe::GenProgram::compileKernel(const gbe::ir::Unit&, const string&, bool), line 202
Trace/breakpoint trap

Hm, so hashcat will be Nvidia-only on NixOS when this is merged? I don't have Nvidia GPU (at home), and I guess there are others in my situation, is this enough of a regression to either (1) first make OpenCL work for Intel (and AMD) or (2) keep hashcat 2.0 around (in addition to 3.0)?

Yeah maybe keeping hashcat 2.x would be a good idea until the OpenCL support in NixOS gets better

Hey @zimbatm, are you still interested in getting this merged?

@grahamc not really, feel free to close or take over if you want

For people coming later, this worked for me on a Dell 9560:

hardware.opengl.extraPackages = [ pkgs.beignet ];