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#!/bin/sh # -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*- # ex: ts=4 sw=4 sts=0 et filetype=sh command -v ask_for_password >/dev/null || . /lib/dracut-crypt-lib.sh # gpg_decrypt mnt_point keypath keydev device # # Decrypts encrypted symmetrically key to standard output. # # mnt_point - mount point where <keydev> is already mounted # keypath - GPG encrypted key path relative to <mnt_point> # keydev - device on which key resides; only to display in prompt # device - device to be opened by cryptsetup; only to display in prompt gpg_decrypt() { local mntp="$1" local keypath="$2" local keydev="$3" local device="$4" local gpghome=/tmp/gnupg local opts="--homedir $gpghome --no-mdc-warning --skip-verify --quiet" opts="$opts --logger-file /dev/null --batch --no-tty --passphrase-fd 0" mkdir -m 0700 -p "$gpghome" ask_for_password \ --cmd "gpg $opts --decrypt $mntp/$keypath" \ --prompt "Password ($keypath on $keydev for $device)" \ --tries 3 --tty-echo-off rm -rf -- "$gpghome" }