#!/usr/bin/env bash # nix-shell https://github.com/sgillespie/nixos-yubikey-luks/archive/master.tar.gz rbtohex() { ( od -An -vtx1 | tr -d ' \n' ) } hextorb() { ( tr '[:lower:]' '[:upper:]' | sed -e 's/\([0-9A-F]\{2\}\)/\\\\\\x\1/gI'| xargs printf ) } key_length=512 iterations=1000000 salt="$(head -n 1 /mnt/crypt-storage/default)" chal="$(echo -n $salt | openssl dgst -binary -sha512 | rbtohex)" resp="$(ykchalresp -2 -x $chal 2>/dev/null)" user_key= read -r user_key luks_key="$(echo -n $user_key | pbkdf2-sha512 $(($key_length / 8)) $iterations $resp | rbtohex)" echo -n $luks_key | hextorb | sudo cryptsetup luksOpen /dev/sda2 crypted --key-file=-