mktapekey

#!/bin/sh
error() {
	>&2 echo $1

	if [ $2 -eq "1" ]
	then
		exit 1
	fi
}

usage() {
	echo $0 "output"
	echo "This script generates a keyfile for stenc using /dev/random"
	echo "The output.raw file contains the raw key"
	echo "The output.key file contains the key in the stenc-format"
}

generate_raw() {
	if [ -s $1.raw ]
	then
		error "[!] $1.raw already exists!" 0
	else
		echo "[ ] Generate $1.raw"
		dd if=/dev/random of=$1.raw bs=32 count=1 status=none
	fi
}

generate_key() {
	if [ -s $1.key ]
	then
		error "[!] $1.key already exists!" 1
	elif [ $(wc -c $1.raw | cut -d ' ' -f 1) -eq "32" ]
	then
		echo "[ ] Generate $1.key"
		xxd -c 32 -g 32 -ps $1.raw > $1.key
	fi
}

if [ "$#" -eq 1 ]
then
	generate_raw $1
	generate_key $1
else
	usage
fi