Issue description

Commit #38382 introduced --disable-kernel_crypto to the configuration of cryptsetup.

This causes cryptsetup open --type=tcrypt to no longer work, with the following message: Required kernel crypto interface not available.

Steps to reproduce

Run cryptsetup open --type=tcrypt ./x foo, where ./x is a truecrypt volume.

Technical details

• system: "x86_64-linux"
• host os: Linux 4.14.79, NixOS, 18.09.1898.001b34abcb4 (Jellyfish)
• multi-user?: yes
• sandbox: yes
• version: nix-env (Nix) 2.1.3
• channels(root): "nixos-18.09.1898.001b34abcb4"
• nixpkgs: /nix/var/nix/profiles/per-user/root/channels/nixos