#!/bin/sh

# This uses a passphrase supplied by the user.

[ "$#" -lt 1 ] && echo "cluster_key_command usage: $0 %R [\"%P\"]" 1>&2 && exit 1

FD="$1"
[ ! -t "$FD" ] && echo "file descriptor $FD does not refer to a terminal" 1>&2 && exit 1
# Supports environment variable PROMPT

[ "$2" ] && PROMPT="$2"


# ----------------------------------------------------------------------

[ ! "$PROMPT" ] && PROMPT='Enter cluster passphrase: '

stty -echo <&"$FD"

echo 1>&"$FD"
echo -n "$PROMPT" 1>&"$FD"
read PASS <&"$FD"

stty echo <&"$FD"

if [ ! "$PASS" ]
then	echo 'invalid:  empty passphrase' 1>&2
	exit 1
fi

echo "$PASS" | sha256sum | cut -d' ' -f1

exit 0